SWP Calculator 2026

An SWP (Systematic Withdrawal Plan) calculator helps you plan and project your regular withdrawals from an investment corpus. It calculates how long your money will last based on your initial investment, monthly withdrawal amount, expected rate of return, and withdrawal frequency. This tool is essential for retirees, pensioners, and anyone living off their investment income. It answers the critical question: 'How long will my money last if I withdraw X amount each month?' The calculator provides a detailed year-by-year projection showing your corpus depletion over time, total withdrawals, and interest earned. The best results come from realistic return assumptions and conservative withdrawal rates. This tool is invaluable for retirees.

The SWP calculation uses the future value of an annuity with periodic withdrawals. The core formula: Remaining Balance = P × (1 + r)^n - PMT × [((1 + r)^n - 1) / r], where: P = Initial Investment, r = Rate of return per period, n = Number of periods, PMT = Periodic withdrawal amount. To find how long the corpus lasts, the calculator iterates through each period until the balance reaches zero. Example: ₹50,00,000 at 8% annual return (0.667% monthly), withdrawing ₹25,000 monthly → Balance after 12 months = ₹50,00,000 × (1.00667)^12 - 25,000 × [((1.00667)^12 - 1) / 0.00667] = ₹49,28,000 approx. This calculation repeats until the balance is exhausted. The calculator handles all this automatically.

The '4% rule' is a widely accepted guideline: withdraw 4% of your initial corpus in the first year, then adjust for inflation annually. This rule was based on US data and has a high probability of making money last 30+ years. Example: ₹50,00,000 corpus → 4% = ₹2,00,000 first year → ₹16,667 monthly. For India/emerging markets, a 3-3.5% withdrawal rate is more conservative due to higher inflation and volatility. The 4% rule isn't guaranteed—it's a historical guideline, not a promise. If you retire during a market downturn, a 3% rate is safer. If you're younger (early retirement), 2.5-3% is more prudent.

Inflation erodes the purchasing power of your fixed withdrawals. ₹25,000 today buys less in 10, 20, or 30 years. Example: ₹25,000 monthly withdrawal today, 5% average inflation → In 10 years, you need ₹40,700 to buy the same goods. In 20 years, you need ₹66,300. This is the biggest risk in SWP planning. A fixed SWP amount that seems adequate today will be inadequate in 10-15 years. To combat inflation: (1) Increase your withdrawal amount annually (e.g., 3-5% per year). (2) Use a 'dynamic SWP' that adjusts withdrawals based on inflation. (3) Start with a conservative withdrawal rate (3-4% of initial corpus). This is critical for retirees in India, USA, UK, Canada, Australia, UAE and worldwide where inflation varies significantly.

Common mistakes: (1) Overestimating investment returns (assuming 10-12% when 6-8% is safer). (2) Underestimating inflation (forgetting that ₹25,000 today loses purchasing power). (3) Using a fixed withdrawal amount that doesn't adjust for inflation. (4) Choosing too high a withdrawal rate (5%+ is risky). (5) Not accounting for taxes (after-tax income is lower). (6) Not stress-testing with lower return scenarios. (7) Forgetting to factor in emergency expenses. (8) Not adjusting withdrawals during market downturns. (9) Ignoring healthcare and long-term care costs. (10) Not planning for longevity (living to 95+). Most SWP plans fail due to over-optimism—not because the math is wrong, but because the assumptions are too rosy. Use conservative assumptions and stress-test your plan.