About the Income Replacement Ratio Calculator
This income replacement ratio calculator measures how much of your working income your retirement income will replace. Add up your expected Social Security benefit, any pension or annuity, other income such as rent or part-time work, and a sustainable withdrawal from your savings, then divide by your pre-retirement gross pay. The result is your replacement ratio.
Financial planners commonly suggest aiming to replace roughly 70%–80% of pre-retirement income, because in retirement you usually stop paying payroll taxes, stop saving for retirement and may have paid off a mortgage. Set your own target and the calculator shows the annual income gap and the extra savings needed to close it at your chosen withdrawal rate.
All amounts are in today’s money and before tax. Use the benefit estimate on your my Social Security statement and pension figures from your plan administrator for the best result. A ratio is a planning shortcut: a budget of your actual retirement expenses is the more precise test.
With the default inputs, the income replacement ratio is 66.7%. Change any value above to recalculate instantly.
How to use the income replacement ratio calculator
- 1Enter your gross household income in the years just before retirement.
- 2Enter your expected yearly Social Security benefit, pension and any other retirement income.
- 3Enter your retirement savings balance and a sustainable withdrawal rate.
- 4Set the replacement ratio you are aiming for, such as 70% or 80%.
- 5Review your ratio, any annual gap and the extra savings that would close it.
Formula and method
Retirement income is the sum of guaranteed sources — Social Security, pensions and annuities — plus other income and a yearly withdrawal from savings equal to the balance times your withdrawal rate w. Dividing that total by your gross pay before retirement gives the replacement ratio as a percentage.
Your target income is the target ratio times pre-retirement pay. If projected income falls short, the gap is the difference, and the extra savings needed is the gap divided by the withdrawal rate — the same logic as the 4% rule, where every $1 of yearly income needs $25 of savings. Everything is in today’s money and before income tax.
- SS
- Annual Social Security benefit
- Pension
- Annual pension or annuity income
- Other
- Other annual retirement income
- Savings
- Retirement savings balance
- w
- Annual withdrawal rate from savings
Worked examples
$90,000 income, $30,000 Social Security, $750,000 saved
A 4% withdrawal from $750,000 gives $30,000, so total income is $60,000 — 66.7% of the $90,000 salary. An 80% target is $72,000, leaving a $12,000 gap that would take $12,000 ÷ 0.04 = $300,000 more in savings.
Teacher with a pension
An $18,000 Social Security benefit, a $33,000 pension and $8,000 from savings total $59,000, replacing 78.7% of a $75,000 salary — above the 75% target, so no extra savings are needed.
High earner relying on savings
At 3.5%, $1.5 million produces $52,500, which with $45,000 of Social Security totals $97,500 — 48.75% of $200,000. A 70% target is $140,000, so the $42,500 gap would need about $1.21 million more at the same withdrawal rate.
Frequently asked questions
What is a good income replacement ratio?+
Many planners use 70%–80% of pre-retirement gross income as a rule of thumb. You may need less if your mortgage is paid off and you saved heavily while working, or more if you plan to travel a lot or expect high healthcare costs.
Why do you need less than 100% of your income in retirement?+
While working, part of your pay goes to payroll taxes, retirement contributions and often work costs and a mortgage. Once retired those usually stop, so the same lifestyle typically costs less than your full gross salary.
How much of my income will Social Security replace?+
It depends on your earnings history and claiming age. Benefits are progressive, so lower earners replace a larger share of their pay than higher earners. Your personal estimate is on your Social Security statement at ssa.gov.
What withdrawal rate should I use?+
The 4% rule — withdrawing 4% of the starting balance and adjusting for inflation — is based on historical US returns over 30-year retirements. Retiring earlier or wanting more safety argues for 3%–3.5%; a shorter retirement may support more.
Should the ratio be based on gross or net income?+
This calculator uses gross pay, which is how replacement ratios are usually quoted. If you prefer, enter after-tax income and after-tax retirement income instead — just keep both sides on the same basis.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.