How long will my money last in retirement?
How long your money lasts is set mostly by how much you withdraw each year, but market returns can impact your income as well. The answer depends on five inputs: your current portfolio, monthly spending, Social Security or pension income, asset allocation, and the age you want the plan to pay income through.
Refined FI's Portfolio Longevity Calculator projects your balance year by year in today's dollars. It subtracts your spending at the beginning of each year, adds Social Security and pension income when those payments begin, then applies a long-run real return based on your mix of stocks, bonds, gold, and cash.
The calculator shows:
- The age your portfolio is projected to run out, or whether it lasts through your planning horizon
- Your year-by-year balance
- The portfolio your plan requires today
- Your funding gap or surplus
- Your annual burn rate
If the plan falls short, the calculator compares three ways to close the gap: spend less, change your stock allocation and portfolio risk, or shorten the planning horizon. You choose the number you want to keep fixed, and the calculator finds funded combinations of the other two.
Your next step: Divide your annual spending by your portfolio value to get your burn rate today, then run the calculator to see what that rate means for your actual timeline.
A burn rate above 7% is considered as high. Above 7%, a bad market early in retirement does damage that later good years cannot repair, even when the long-run math works out.
This is a planning estimate, not a guarantee. It uses constant long-run real returns rather than testing different market sequences, and actual returns may vary.