What the Income Estimate Means
A sketch of annual portfolio income — not a pension promise
When the calculator shows an annual income figure, it is applying a withdrawal rate to your projected balance. That is a useful sketch, and it is built on a stack of assumptions that are worth understanding before you plan a retirement budget around it.
What the number is made of
It takes your projected ending balance and multiplies it by a withdrawal percentage, typically around 4%. That is the entire calculation.
Both ingredients are estimates. The balance assumes a steady return for decades, and the withdrawal rate assumes markets behave roughly as they have historically.
Stacking two estimates produces a third estimate with wider uncertainty than either one alone, which is why it should be read as a range rather than a figure.
It is a pre-tax number
Withdrawals from traditional 401(k) and IRA accounts are taxed as ordinary income. A $48,000 estimate might be $40,000 or less after taxes depending on your situation.
Roth withdrawals are different, coming out tax-free when qualified. If your savings are split between account types, the spendable amount falls somewhere in between.
When budgeting, reduce the estimate for taxes before comparing it against your expected expenses. Skipping this step is a common and expensive oversight.
- The estimate is pre-tax for traditional retirement accounts.
- It excludes Social Security, pensions, and any other income.
- It assumes a steady return across the entire accumulation period.
- It says nothing about how long the money lasts under bad conditions.
- Inflation means future dollars buy less than the figure suggests today.
What it leaves out
Social Security and pensions are not included, which means the total income available to you is likely higher than this figure alone.
It also does not model a declining balance during retirement, market volatility during withdrawals, or the possibility that you spend more in early retirement than later.
None of those omissions make it useless. They mean it answers one narrow question: roughly what income could this portfolio support at a standard withdrawal rate.
Adjust it for inflation
An income estimate thirty years out is stated in future dollars. At 3% inflation, $60,000 then feels like roughly $25,000 today.
To compare against your current budget, either deflate the estimate or plan with a real return so the output is already in today's purchasing power.
Doing this once usually reveals whether the plan is genuinely on track, and it is the step most likely to change someone's contribution decision.
How to use it well
Compare scenarios rather than fixating on a single output. Does raising your contribution by $200 move the income estimate enough to matter? That question the tool answers reliably.
Use it to sanity-check your retirement age. If the estimate at 62 is uncomfortable and the estimate at 66 is fine, you have learned something concrete.
Recheck annually with your real balance rather than the projection you made years ago. Actual data beats an old model every time.
As you approach retirement, replace this sketch with a more detailed plan that accounts for taxes, Social Security timing, and health care costs specifically.
Try these inputs
- Base case: your real inputs to age 67
- After inflation: same run at a real return of 4%
- With more saving: add $200/mo and compare the income estimate