us • USD

401(k) Calculator 2026

Calculate 401(k) retirement savings with employer matching, annual contributions, investment returns, and ROTH conversion impacts. Estimate your retirement portfolio value at retirement age with IRS contribution limits updated for 2026. See how employer match accelerates wealth-building.

Last revised 26 September 2026

By Team GlobalCalqulate · About our editorial standards

Personal & Retirement Details

Current Age

Used to estimate contribution limits, catch-up eligibility, and years until retirement.

Target Retirement Age

Choose the age you expect to stop working or begin retirement withdrawals.

Financial Disclaimer: This result is an educational estimate produced by applying a standard formula to the figures you entered. It is not an offer, a quotation, or financial advice: real costs and returns depend on a provider's pricing, fees and underwriting, and on circumstances this calculator does not collect. Confirm the figures with the provider or a qualified adviser before acting on them. Full disclaimer.

Calculation type: Projection from your assumptions.

Your entries stay on this device. This calculator runs entirely in your browser — the figures you type are not sent to us or to anyone else. The page itself uses cookies for analytics and advertising, described in the privacy policy.

Financial Disclaimer: This calculator projects 401(k) growth using a constant assumed rate of return and does not account for market volatility, plan fees beyond the entered expense ratio, vesting schedules, plan-specific investment options, or changes to contribution limits and tax law over time. Actual results will vary based on market performance and your plan's terms. This is an educational estimate, not financial or tax advice — consult a qualified financial advisor before making retirement contribution decisions. Full disclaimer.

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What is a 401(k)?

A 401(k) is an employer-sponsored retirement savings plan that allows employees to contribute a portion of their pre-tax salary toward retirement. The employer often matches a percentage of employee contributions, providing free money for retirement savings. Unlike regular savings accounts, 401(k) contributions reduce your current taxable income, and earnings grow tax-deferred until withdrawal in retirement.

The key advantage of a 401(k) is the employer match — it's essentially free retirement money that can significantly accelerate wealth building. Additionally, the tax deferral means more of your money compounds over time without being reduced by annual taxes. However, withdrawals before age 59½ typically incur a 10% penalty plus income taxes, making it a true long-term savings vehicle.

In 2026, employees can contribute up to $24,500 per year, with a catch-up contribution of an additional $8,000 for those aged 50–59 and 64+, or $11,250 for those aged 60–63 under the SECURE 2.0 Act. Understanding your plan options, contribution limits, and investment allocation is critical for optimizing retirement readiness.

401(k) Growth Formula

Future Value = Principal × (1 + r)^n + Annual Contribution × [((1+r)^n - 1) / r]

Where: Principal is your opening balance, r is the annual return rate (as decimal), n is years, and annual contribution is your yearly deposit. This compounds both your initial investment and regular contributions.

Key Terms & Definitions

Contribution Limit

Maximum amount an employee can deposit annually ($24,500 in 2026, before catch-up)

Employer Match

Employer's contribution to your 401(k), usually a percentage of your salary

Vesting

Timeline on which employer contributions become fully yours (cliff or graded)

Tax Deferral

Postponed taxation on contributions and gains until retirement withdrawal

Rollover

Transfer of 401(k) balance to another retirement account without penalties

Distribution

Withdrawal of funds from your 401(k), typically in retirement

401(k) Optimization Tips

✓Always contribute enough to capture your employer's full match — it's free retirement money
✓Diversify your investments across stocks, bonds, and target-date funds based on risk tolerance
✓Avoid early withdrawals before 59½ to prevent 10% penalties and lost compound growth
✓Rebalance your portfolio annually to maintain your desired asset allocation
✓Understand your plan's investment options and fee structure
✓Consider increasing contributions when you receive raises to boost retirement savings

Methodology, Assumptions & Disclaimers (US 401(k) Calculator 2026)

This 401(k) calculator models long-term retirement savings for US workers by combining your salary, contribution rate, employer match, investment return assumptions, plan expense ratio, and time to retirement. It is designed for educational use on tax-advantaged workplace retirement plans and should not be treated as individualized financial or tax advice.

2026 IRS contribution limits: The 2026 employee elective deferral limit is $24,500. Participants aged 50–59 and 64+ may add the standard catch-up of $8,000 (total $32,500). Under the SECURE 2.0 Act (effective 2025), participants aged 60–63 qualify for an enhanced super catch-up of $11,250 (total $35,750). The combined employer + employee annual additions limit is $72,000. The calculator automatically applies the correct catch-up tier based on the age you enter each year.

Expense ratio / plan fee modeling: The expense ratio you enter is subtracted from the gross annual return each year, accurately reflecting how fund and plan administration fees compound against your holdings. Typical US 401(k) index fund expense ratios range from 0.03–0.20%; actively managed funds often charge 0.50–1.50% or more. Even a 0.50% difference in fees can reduce a 30-year portfolio balance by 10–15%.

Contributions are applied annually, employer match is constrained by a match percentage and match cap, and total annual contributions are checked against the 2026 IRS combined limit. The engine approximates effective federal income tax using simplified 2026 brackets and lets you layer in a state tax rate to compare Traditional versus Roth-style after-tax outcomes.

Retirement income estimate (4% SWR): Monthly retirement income figures are derived by applying the 4% Sustainable Withdrawal Rate (William Bengen, 1994; Trinity Study) to the projected after-tax balance and dividing by 12. This is a widely used planning rule of thumb — not a guaranteed safe withdrawal amount — and does not account for sequence-of-returns risk, healthcare cost inflation, or individual spending patterns.

Investment growth assumes a constant average annual net return (gross return minus expense ratio) and smooth compounding over the projection horizon. Real markets are volatile; sequence of returns, job changes, contribution breaks, and investment choices will all affect your actual results. Inflation adjustment is applied using the rate you enter to estimate purchasing power in today's dollars.

Key reference points: IRS Notice 2025-67, announced as IR-2025-111 (2026 retirement plan limits); IRS Publication 560 (retirement plans for small business); SECURE 2.0 Act of 2022 (Pub. L. 117-328) for super catch-up provisions; US Department of Labor 401(k) fee disclosure guidance (29 CFR § 2550); Bengen (1994) and Cooley, Hubbard & Walz (1998) for the 4% SWR rule.

Last updated: March 2026. This tool is for informational and educational purposes only and does not provide financial, tax, or investment advice. Always confirm current IRS rules and consult a qualified professional before making retirement or investment decisions.

Help & FAQs

Frequently Asked Questions

Clear answers to common questions to help you use this calculator confidently.

What is the 401(k) contribution limit for 2026?

Tap to view the answer

For 2026, the IRS employee elective deferral limit is $24,500. Workers aged 50–59 and 64+ can contribute an additional $8,000 standard catch-up, for a total of $32,500. Under the SECURE 2.0 Act, workers aged 60–63 qualify for an enhanced super catch-up of $11,250, allowing up to $35,750 total. The combined employer + employee annual additions limit is $72,000. This calculator automatically applies the correct catch-up tier based on the age you enter.

How does this calculator model employer match and IRS limits?

Tap to view the answer

The engine applies your employer match percentage up to the match limit (commonly 0–6% of salary), then enforces the 2026 IRS combined limit of $72,000 total (employee + employer). If your salary, contribution rate, and match would exceed that limit, the calculator proportionally scales back employer contributions. The employee elective deferral limit of $24,500 (plus catch-up) also applies individually.

What is the difference between Traditional and Roth 401(k)?

Tap to view the answer

Traditional: pre-tax contributions reduce taxable income today, but withdrawals are taxed as ordinary income in retirement. Roth: after-tax contributions with no deduction today, but qualified withdrawals (age 59.5+, 5-year hold) are entirely tax-free. Choose Traditional if you expect a lower tax bracket in retirement; choose Roth if you expect a higher bracket or want tax-free growth. This calculator shows both scenarios' after-tax value for comparison.

How is the estimated monthly retirement income calculated?

Tap to view the answer

The calculator uses the 4% sustainable withdrawal rate: divide your projected balance by 25, then by 12 months. Example: a $500K balance ÷ 25 = $20K annual ÷ 12 = $1,667/month. This rule, derived from the Trinity Study and refined by William Bengen, suggests a diversified portfolio can historically support 4% annual withdrawals for 30+ years without depletion.

How does a 401(k) expense ratio affect my retirement outcome?

Tap to view the answer

Expense ratios are annual percentage fees charged by funds and plan administration. On a $300K balance, a 1.0% fee costs $3,000/year versus $300/year at 0.1%. Over 20-30 years at typical market returns, that difference compounds into $100K or more in final balance. Most institutional 401(k) plans offer index funds at 0.05–0.15%; actively managed funds run 0.5–2.0%.

Need more help? Contact support or email globalcalqulate@gmail.com

We typically reply within 24–48 hours.

Sources & references

401(k) and profit-sharing plan contribution limits — Internal Revenue Service
Notice 2025-67 — 2026 amounts relating to retirement plans and IRAs — Internal Revenue Service
401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500 — Internal Revenue Service
COLA increases for dollar limitations on benefits and contributions — Internal Revenue Service
Rev. Proc. 2025-32 — 2026 inflation adjustments (tax rate tables, standard deduction) — Internal Revenue Service
Federal income tax rates and brackets — Internal Revenue Service
Standard deduction — Internal Revenue Service
Child Tax Credit — amounts, credit for other dependents, phase-out thresholds — Internal Revenue Service
One, Big, Beautiful Bill provisions — enhanced deduction for seniors (IRC 151(f)) — Internal Revenue Service

Calculation type: Projection from your assumptions. Uses 2026 rates and thresholds. Figures are taken from Internal Revenue Service — see sources below.

Reviewed by Team GlobalCalqulate — Verifies each figure against the issuing authority's published source · Checked 3 August 2026

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Year-by-year projection (approximate) – yearly breakdown of opening balance, interest, principal, and closing balance.
Year	Opening	Interest	Principal	Closing
Y1	$25,000.00	$2,551.25	$14,250.00	$41,801.25
Y2	$41,801.25	$3,677.48	$14,775.35	$60,254.08
Y3	$60,254.08	$4,912.34	$15,320.40	$80,486.82
Y4	$80,486.82	$6,264.23	$15,885.91	$102,636.96
Y5	$102,636.96	$7,742.13	$16,472.65	$126,851.74
Y6	$126,851.74	$9,355.66	$17,081.43	$153,288.83
Y7	$153,288.83	$11,115.13	$17,713.10	$182,117.06
Y8	$182,117.06	$13,031.56	$18,368.52	$213,517.14
Y9	$213,517.14	$15,116.77	$19,048.60	$247,682.51
Y10	$247,682.51	$17,383.39	$19,754.28	$284,820.18
Y11	$284,820.18	$19,844.94	$20,486.54	$325,151.65
Y12	$325,151.65	$22,515.87	$21,246.40	$368,913.92
Y13	$368,913.92	$25,411.67	$22,034.90	$416,360.50
Y14	$416,360.50	$28,548.89	$22,853.15	$467,762.54
Y15	$467,762.54	$31,945.21	$23,702.29	$523,410.05
Y16	$523,410.05	$35,619.58	$24,583.49	$583,613.11
Y17	$583,613.11	$39,592.22	$25,497.98	$648,703.31
Y18	$648,703.31	$43,884.77	$26,447.04	$719,035.12
Y19	$719,035.12	$48,520.36	$27,431.99	$794,987.47
Y20	$794,987.47	$53,523.71	$28,454.20	$876,965.38
Y21	$876,965.38	$58,921.23	$29,515.12	$965,401.73
Y22	$965,401.73	$64,741.17	$30,616.21	$1,060,759.11
Y23	$1,060,759.11	$71,013.68	$31,759.03	$1,163,531.83
Y24	$1,163,531.83	$77,771.01	$32,945.18	$1,274,248.01
Y25	$1,274,248.01	$85,047.58	$34,176.31	$1,393,471.90
Y26	$1,393,471.90	$92,880.19	$35,454.16	$1,521,806.25
Y27	$1,521,806.25	$101,308.14	$36,780.52	$1,659,894.91
Y28	$1,659,894.91	$110,373.39	$38,157.27	$1,808,425.57
Y29	$1,808,425.57	$120,120.77	$39,586.33	$1,968,132.67
Y30	$1,968,132.67	$130,598.16	$41,069.72	$2,139,800.55
Y31	$2,139,800.55	$141,856.66	$42,609.54	$2,324,266.74
Y32	$2,324,266.74	$153,950.85	$44,207.95	$2,522,425.54
Y33	$2,522,425.54	$166,939.03	$45,867.21	$2,735,231.78
Y34	$2,735,231.78	$180,883.39	$47,589.67	$2,963,704.85
Y35	$2,963,704.85	$195,596.79	$45,476.55	$3,204,778.19
Total	—	$2,192,559.21	$987,218.99	$3,204,778.19

Year

Opening

Interest

Principal

Closing

$25,000.00

$2,551.25

$14,250.00

$41,801.25

$3,677.48

$14,775.35

$60,254.08

$4,912.34

$15,320.40

$80,486.82

$6,264.23

$15,885.91

$102,636.96

$7,742.13

$16,472.65

$126,851.74

$9,355.66

$17,081.43

$153,288.83

$11,115.13

$17,713.10

$182,117.06

$13,031.56

$18,368.52

$213,517.14

$15,116.77

$19,048.60

$247,682.51

Y10

$247,682.51

$17,383.39

$19,754.28

$284,820.18

Y11

$284,820.18

$19,844.94

$20,486.54

$325,151.65

Y12

$325,151.65

$22,515.87

$21,246.40

$368,913.92

Y13

$368,913.92

$25,411.67

$22,034.90

$416,360.50

Y14

$416,360.50

$28,548.89

$22,853.15

$467,762.54

Y15

$467,762.54

$31,945.21

$23,702.29

$523,410.05

Y16

$523,410.05

$35,619.58

$24,583.49

$583,613.11

Y17

$583,613.11

$39,592.22

$25,497.98

$648,703.31

Y18

$648,703.31

$43,884.77

$26,447.04

$719,035.12

Y19

$719,035.12

$48,520.36

$27,431.99

$794,987.47

Y20

$794,987.47

$53,523.71

$28,454.20

$876,965.38

Y21

$876,965.38

$58,921.23

$29,515.12

$965,401.73

Y22

$965,401.73

$64,741.17

$30,616.21

$1,060,759.11

Y23

$1,060,759.11

$71,013.68

$31,759.03

$1,163,531.83

Y24

$1,163,531.83

$77,771.01

$32,945.18

$1,274,248.01

Y25

$1,274,248.01

$85,047.58

$34,176.31

$1,393,471.90

Y26

$1,393,471.90

$92,880.19

$35,454.16

$1,521,806.25

Y27

$1,521,806.25

$101,308.14

$36,780.52

$1,659,894.91

Y28

$1,659,894.91

$110,373.39

$38,157.27

$1,808,425.57

Y29

$1,808,425.57

$120,120.77

$39,586.33

$1,968,132.67

Y30

$1,968,132.67

$130,598.16

$41,069.72

$2,139,800.55

Y31

$2,139,800.55

$141,856.66

$42,609.54

$2,324,266.74

Y32

$2,324,266.74

$153,950.85

$44,207.95

$2,522,425.54

Y33

$2,522,425.54

$166,939.03

$45,867.21

$2,735,231.78

Y34

$2,735,231.78

$180,883.39

$47,589.67

$2,963,704.85

Y35

$2,963,704.85

$195,596.79

$45,476.55

$3,204,778.19

Total

—

$2,192,559.21

$987,218.99

$3,204,778.19

How to Use This Calculator

Enter your US salary and starting balance

Begin with your current gross annual salary in US dollars and, if applicable, the balance already accumulated across your 401(k) accounts.

Set your employee and employer contributions

Choose the percentage of salary you contribute and how much your US employer matches, up to the stated match limit. The engine automatically checks against IRS-style annual limits.

Configure growth, inflation, and taxes

Select expected annual investment return, long-run US inflation, salary growth, contribution step-ups, and an approximate state income tax rate to model after-tax retirement outcomes.

Review Traditional vs Roth projections

The calculator produces a full year-by-year 401(k) projection, compares Traditional and Roth after-tax values, and shows an inflation-adjusted balance in today's dollars.

Understanding Your Results

Projected 401(k) Balance
Estimated value of your US 401(k) plan at your chosen retirement age, net of the expense ratio you entered, assuming contributions and investment returns follow the inputs you provided.
Total Contributions
Total dollars contributed by you and your employer over the full projection period, before investment growth.
Investment Growth (net of fees)
Compound growth from US and global investments held in your plan, after subtracting your fund expense ratio and plan administration fees each year. Even a 0.5% annual fee reduces a 30-year result significantly.
Inflation-Adjusted Value
Your projected balance converted into today's US dollars using the inflation rate you selected, which helps you understand real retirement purchasing power.
Estimated Monthly Retirement Income (4% Rule)
Applies the widely used 4% Sustainable Withdrawal Rate (SWR) to your projected after-tax balance, divided by 12, to estimate sustainable monthly income in retirement. This rule of thumb — from Bengen (1994) — is a starting point, not a guarantee.
Traditional vs Roth 401(k) After-Tax Delta
The difference between the estimated after-tax value of a Roth 401(k) and a Traditional 401(k), using simplified tax rate assumptions. A positive number means Roth comes out ahead after taxes under these assumptions; a negative number favors Traditional.

Key Tips

✓
In the United States, try to contribute at least enough to receive the full employer match – turning down a match is usually leaving guaranteed compensation on the table.
✓
Schedule automatic 1–2 percentage point increases in your 401(k) contribution rate each year as your US salary grows, especially after raises or bonuses.
✓
Starting contributions in your 20s or early 30s can lead to significantly higher 401(k) balances at retirement because compound growth has more years to work.
✓
Keep your 401(k) invested in a diversified mix of stocks and bonds appropriate for your risk tolerance and age; avoid concentrating too much in your employer's stock.
✓
Review your contribution level at least once a year or whenever your income or US tax situation changes, especially if IRS 401(k) contribution limits increase.
✓
Choose low-cost index funds whenever available in your plan. Even reducing your expense ratio from 1.0% to 0.1% can add tens of thousands of dollars to your 401(k) balance over a 30-year career — enter different expense ratios into the calculator to see the impact.
✓
Under SECURE 2.0 (effective 2025), if you are between ages 60 and 63, you qualify for a larger "super catch-up" contribution limit of $11,250 instead of the standard $8,000 catch-up for other participants aged 50 and over. Use these peak earning years to accelerate savings.

US 401(k) Calculator – In-Depth Retirement Planning Guide (2026)

How this US 401(k) calculator works

This US 401(k) calculator models your retirement savings by combining several core inputs: your current 401(k) balance (if any), your annual salary in US dollars, the percentage of pay you contribute, your employer's match formula, expected investment return, projected salary growth, and the number of years until retirement. For each year between your current age and retirement age, the engine:

- Estimates your salary for that year based on the salary growth rate you choose. - Applies your employee contribution rate to that salary, subject to projected IRS-style elective deferral and total contribution limits. - Calculates your employer's matching contribution using the match rate and match limit you provide, again constrained by a conservative total 401(k) limit. - Adds employee and employer contributions to your opening balance, then applies your expected annual rate of return to grow the account for that year.

By repeating this process for every year until retirement, the calculator produces a year-by-year projection of your 401(k) balance, total contributions, and investment growth. You can also specify a state income tax rate to approximate the combined impact of US federal and state taxes on your Traditional 401(k) withdrawals versus Roth-style after-tax savings.

Explore all US retirement calculators

Formulas behind the 401(k) projection

Under the hood, this US 401(k) calculator uses standard time-value-of-money and compounding formulas that financial planners apply every day. At a high level, the ending balance for each year is:

Ending balance = (Opening balance + Total contributions) × (1 + r_net)

where r_net = Annual return % − Expense ratio %. This means plan fees are deducted from the gross return each and every year — which is how real-world mutual fund and ETF fees work inside 401(k) plans.

Employee contributions are calculated as:

Employee contribution = Min(Salary × Contribution %, 2026 IRS employee deferral limit + applicable catch-up)

For 2026, the elective deferral limit is $24,500. Under SECURE 2.0, if you are aged 50–59 or 64+, you may contribute an additional $8,000 catch-up. If you are aged 60–63, you qualify for the enhanced "super catch-up" of $11,250.

Employer contributions are based on your employer match structure, for example "50% match on the first 4% of pay":

Employer contribution (before caps) = Salary × Match % × Min(Your contribution %, Match limit %)

So the match follows what you actually defer: contributing 2% of pay to a 50%-up-to-6% plan earns a 1% match, not 3%.

Then the calculator enforces the 2026 IRS annual additions limit of $72,000 so that:

Employee contribution + Employer contribution ≤ $72,000.

To estimate after-tax values for Traditional versus Roth 401(k), the model approximates an effective federal income tax rate using simplified 2026 US tax brackets and adds your selected state income tax rate. It applies a modestly lower effective tax rate at retirement, reflecting that many households have lower taxable income in retirement than during peak earning years. Roth-style balances are treated as after-tax and are not reduced again in the projection, assuming IRS rules for qualified withdrawals are met.

Retirement income is estimated using the 4% Sustainable Withdrawal Rate (SWR), dividing projected after-tax balance by 25 and showing the monthly equivalent. This widely used rule of thumb — first described by William Bengen in 1994 — suggests a 30-year portfolio historically supported a 4% annual withdrawal with a high probability of not being depleted. It is a planning estimate, not a guarantee.

Understand compound interest in more detail

Worked US 401(k) example (step-by-step)

Consider a 30-year-old worker in the United States earning $75,000 per year, with an existing 401(k) balance of $25,000. They contribute 8% of pay to the plan, their employer matches 50% of contributions up to 4% of salary, they expect a 7% average annual return before inflation, long-run US inflation of 2.5%, and modest salary growth of 2.5% per year. They plan to retire at age 65.

1. In year one, salary is $75,000. The employee contributes 8% of pay, or $6,000. The employer match is 50% of the first 4% of pay (4% of $75,000 is $3,000), so the employer adds $1,500. Total contributions for the first year are $7,500, subject to IRS-style annual caps, which this calculator enforces conservatively. 2. The opening balance of $25,000 plus $7,500 of contributions grows at 6.5% (the 7% return less a 0.5% expense ratio), leading to an end-of-year balance of $34,612.50. 3. In year two and beyond, salary increases by 2.5% annually, so contributions rise with pay. Each year, the engine re-applies the same contribution formulas and growth rate, producing a detailed amortization-style schedule of balances, contributions, and growth. 4. By age 65, with no annual contribution increase and no state tax, the projected balance is about $1.56 million in nominal dollars. The inflation-adjusted balance in today's dollars is lower, but more meaningful for planning retirement lifestyle and US living costs.

The calculator also estimates a Traditional after-tax value by applying an effective tax rate at retirement, and a Roth after-tax value that reflects taxes paid upfront rather than at withdrawal. The summary section highlights the difference between these two approaches so users can see how much tax timing may matter over a multi-decade horizon.

Compare with a US Roth IRA scenario

Scenario comparison: higher contributions vs conservative investing

A powerful way to use this US 401(k) calculator is to compare at least two scenarios side by side. For example:

Scenario A – Aggressive contributions: You contribute 10% of a $75,000 salary, receive a 4% employer match, expect a 7% annual return, and allow your contribution percentage to increase by 1% per year until you reach the IRS limit. Scenario B – Conservative contributions, conservative portfolio: You contribute 5% of salary, still receive the 4% match, but assume a 5% annual return and no automatic contribution increases.

Over a 30–35 year career, Scenario A will usually produce a substantially higher projected 401(k) balance because both the contribution rate and the compounding engine are doing more work. However, Scenario B may feel more comfortable for someone prioritizing short-term cash flow or investing in a lower-volatility mix of US stocks and bonds.

By adjusting the "Expected Annual Return", "Annual Salary Growth", and "Annual Contribution Increase" fields and rerunning the calculator, you can explore how different assumptions interact. For many US households, steadily raising contribution rates over time often has more impact on retirement readiness than small tweaks to investment return assumptions.

Common US 401(k) mistakes this calculator can highlight

Several recurring 401(k) mistakes show up clearly when you experiment with the inputs in this calculator:

- Not contributing enough to secure the full employer match, which effectively leaves guaranteed compensation unused. - Keeping contribution rates flat for years even as salary climbs, leading to retirement savings that lag behind lifestyle inflation and higher US living costs. - Using unrealistically high return assumptions that underestimate risk and volatility in US and global markets. - Ignoring the impact of inflation, resulting in a retirement balance that looks large in dollars but has far less purchasing power in the future. - Failing to consider tax diversification between Traditional (pre-tax) and Roth (after-tax) 401(k) options, which can make retirement withdrawals less flexible.

When you adjust the inputs to remove these mistakes – for example, by increasing contributions to at least the match threshold, turning on modest contribution step-ups, and using a realistic return range – the projected 401(k) path often changes meaningfully.

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When to use this US 401(k) calculator

This US-focused 401(k) calculator is most useful for workers who participate in an employer-sponsored 401(k) plan and want a structured way to test contribution strategies. It is particularly valuable when:

- You are starting a new job in the United States and need to decide how much of your paycheck to defer into the 401(k). - Your employer changes its match policy and you want to see how the new formula affects long-term retirement savings. - You receive a raise, bonus, or promotion and are deciding how much extra to direct toward retirement versus near-term goals. - You are evaluating Traditional versus Roth 401(k) contributions and want a directional view of after-tax outcomes. - You are within 10–15 years of retirement in the US and want to stress-test whether current savings rates and investment assumptions are on track.

For comprehensive retirement planning, pair this calculator with tools that model Social Security benefits, IRA or Roth IRA contributions, and required minimum distributions (RMDs) to capture the full picture of US retirement income.

Key US sources and methodology notes (2026)

The methodology behind this calculator draws on publicly available US government resources and standard financial planning practices. Contribution limits reflect 2026 IRS guidance: employee elective deferral limit $24,500; catch-up for ages 50–59 and 64+ is $8,000; SECURE 2.0 super catch-up for ages 60–63 is $11,250; combined annual additions limit (employee + employer) is $72,000. These figures come from IRS Notice 2025-67, announced in news release IR-2025-111 (13 November 2025), and the calculator reads them from the site's dataset registry rather than restating them, so the engine and this page cannot disagree. Tax rate estimates use the 2026 US federal income tax brackets for single filers with a user-entered state income tax rate layered on top.

Expense ratio modeling deducts the user-specified percentage from the gross annual return each year, reflecting the drag of fund-level and plan-level fees. The retirement income estimate applies the 4% Sustainable Withdrawal Rate rule (Bengen 1994; reaffirmed by subsequent Trinity Study research).

Because official IRS limits, US tax brackets, employer plan rules, and the findings on safe withdrawal rates can change, always confirm current thresholds on IRS.gov or with your plan administrator. Treat the projections from this calculator as educational estimates rather than predictions or personalized advice.

Review IRS guidance on 401(k) plans (external)

US 401(k) Calculator – In-Depth Retirement Planning Guide (2026)

Year-by-year projection (approximate) – yearly breakdown of opening balance, interest, principal, and closing balance.
Year	Opening	Interest	Principal	Closing
Y1	$25,000.00	$2,551.25	$14,250.00	$41,801.25
Y2	$41,801.25	$3,677.48	$14,775.35	$60,254.08
Y3	$60,254.08	$4,912.34	$15,320.40	$80,486.82
Y4	$80,486.82	$6,264.23	$15,885.91	$102,636.96
Y5	$102,636.96	$7,742.13	$16,472.65	$126,851.74
Y6	$126,851.74	$9,355.66	$17,081.43	$153,288.83
Y7	$153,288.83	$11,115.13	$17,713.10	$182,117.06
Y8	$182,117.06	$13,031.56	$18,368.52	$213,517.14
Y9	$213,517.14	$15,116.77	$19,048.60	$247,682.51
Y10	$247,682.51	$17,383.39	$19,754.28	$284,820.18
Y11	$284,820.18	$19,844.94	$20,486.54	$325,151.65
Y12	$325,151.65	$22,515.87	$21,246.40	$368,913.92
Y13	$368,913.92	$25,411.67	$22,034.90	$416,360.50
Y14	$416,360.50	$28,548.89	$22,853.15	$467,762.54
Y15	$467,762.54	$31,945.21	$23,702.29	$523,410.05
Y16	$523,410.05	$35,619.58	$24,583.49	$583,613.11
Y17	$583,613.11	$39,592.22	$25,497.98	$648,703.31
Y18	$648,703.31	$43,884.77	$26,447.04	$719,035.12
Y19	$719,035.12	$48,520.36	$27,431.99	$794,987.47
Y20	$794,987.47	$53,523.71	$28,454.20	$876,965.38
Y21	$876,965.38	$58,921.23	$29,515.12	$965,401.73
Y22	$965,401.73	$64,741.17	$30,616.21	$1,060,759.11
Y23	$1,060,759.11	$71,013.68	$31,759.03	$1,163,531.83
Y24	$1,163,531.83	$77,771.01	$32,945.18	$1,274,248.01
Y25	$1,274,248.01	$85,047.58	$34,176.31	$1,393,471.90
Y26	$1,393,471.90	$92,880.19	$35,454.16	$1,521,806.25
Y27	$1,521,806.25	$101,308.14	$36,780.52	$1,659,894.91
Y28	$1,659,894.91	$110,373.39	$38,157.27	$1,808,425.57
Y29	$1,808,425.57	$120,120.77	$39,586.33	$1,968,132.67
Y30	$1,968,132.67	$130,598.16	$41,069.72	$2,139,800.55
Y31	$2,139,800.55	$141,856.66	$42,609.54	$2,324,266.74
Y32	$2,324,266.74	$153,950.85	$44,207.95	$2,522,425.54
Y33	$2,522,425.54	$166,939.03	$45,867.21	$2,735,231.78
Y34	$2,735,231.78	$180,883.39	$47,589.67	$2,963,704.85
Y35	$2,963,704.85	$195,596.79	$45,476.55	$3,204,778.19
Total	—	$2,192,559.21	$987,218.99	$3,204,778.19

How this US 401(k) calculator works

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Formulas behind the 401(k) projection

Under the hood, this US 401(k) calculator uses standard time-value-of-money and compounding formulas that financial planners apply every day. At a high level, the ending balance for each year is:

Ending balance = (Opening balance + Total contributions) × (1 + r_net)

Employee contributions are calculated as:

Employee contribution = Min(Salary × Contribution %, 2026 IRS employee deferral limit + applicable catch-up)

Employer contributions are based on your employer match structure, for example "50% match on the first 4% of pay":

Employer contribution (before caps) = Salary × Match % × Min(Your contribution %, Match limit %)

So the match follows what you actually defer: contributing 2% of pay to a 50%-up-to-6% plan earns a 1% match, not 3%.

Then the calculator enforces the 2026 IRS annual additions limit of $72,000 so that:

Employee contribution + Employer contribution ≤ $72,000.

Understand compound interest in more detail

Worked US 401(k) example (step-by-step)

Compare with a US Roth IRA scenario

Scenario comparison: higher contributions vs conservative investing

A powerful way to use this US 401(k) calculator is to compare at least two scenarios side by side. For example:

Common US 401(k) mistakes this calculator can highlight

Several recurring 401(k) mistakes show up clearly when you experiment with the inputs in this calculator:

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When to use this US 401(k) calculator

Key US sources and methodology notes (2026)

Review IRS guidance on 401(k) plans (external)

Calculator inputs

Personal & Retirement Details

Income & Current Savings2 options

401(k) Contributions4 options

Investment Assumptions5 options

Tax Assumptions1 option

Your results

What is a 401(k)?

401(k) Growth Formula

Key Terms & Definitions

Contribution Limit

Employer Match

Vesting

Tax Deferral

Rollover

Distribution

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Methodology, Assumptions & Disclaimers (US 401(k) Calculator 2026)

What is the 401(k) contribution limit for 2026?

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Personal & Retirement Details

Income & Current Savings2 options

401(k) Contributions4 options

Investment Assumptions5 options

Tax Assumptions1 option

Your results

Year-by-year projection (approximate)

How to Use This Calculator

Sample US 401(k) outcome at age 65

Understanding Your Results

Key Tips

US 401(k) Calculator – In-Depth Retirement Planning Guide (2026)

How this US 401(k) calculator works

Formulas behind the 401(k) projection

Worked US 401(k) example (step-by-step)

Scenario comparison: higher contributions vs conservative investing

Common US 401(k) mistakes this calculator can highlight

When to use this US 401(k) calculator

Key US sources and methodology notes (2026)

Year-by-year projection (approximate)

How to Use This Calculator

Sample US 401(k) outcome at age 65

Understanding Your Results

Key Tips

US 401(k) Calculator – In-Depth Retirement Planning Guide (2026)

How this US 401(k) calculator works

Formulas behind the 401(k) projection

Worked US 401(k) example (step-by-step)

Scenario comparison: higher contributions vs conservative investing

Common US 401(k) mistakes this calculator can highlight

When to use this US 401(k) calculator

Key US sources and methodology notes (2026)