Retirement Withdrawal Calculator — Safe Withdrawal Rates & 4% Rule

What is a Safe Withdrawal Rate (SWR)?

A Safe Withdrawal Rate (SWR) is the percentage of your initial retirement portfolio that you can withdraw in your first year of retirement, adjusting that amount for inflation in subsequent years, without running out of money before you die. The most famous benchmark for SWR is the 4% Rule.

The 4% Rule originates from the 1998 Trinity Study, which tested various withdrawal rates against historical stock and bond market data. It concluded that a retiree with a 50/50 or 75/25 stock-to-bond allocation could withdraw 4% initially, adjusted for inflation annually, and have a near 100% success rate over a 30-year retirement period.

How Inflation Impacts Your Portfolio

Inflation is the silent killer of retirement portfolios. If your initial spending target is $40,000 and inflation averages 3%, your spending target in year 10 will need to be over $53,000 just to maintain the exact same purchasing power.

This calculator adjusts your desired income up by your estimated inflation rate each year. Your investment returns must work hard not just to fund your withdrawals, but to keep the remaining principal growing fast enough to offset this compounding inflation.

Factoring in Social Security & Pensions

The 4% Rule traditionally assumes your entire lifestyle is funded by your portfolio. In reality, many retirees have fixed income sources like Social Security, pensions, or rental income.

• Reduced Reliance: If your target spending is $60,000 and you receive $20,000 from Social Security, you only need to withdraw $40,000 from your investments.
• Lower Required Portfolio: By reducing the withdrawal burden on your portfolio, Social Security drastically lowers the total amount you need to save to achieve financial independence.

Note: In this calculator's model, we assume your Social Security or Pension benefits will also scale with inflation (like Cost of Living Adjustments, or COLAs).