Income Replacement Ratio

Divide the income you expect in the first year of retirement by the income you earned just before retiring, and multiply by 100. Someone earning $100,000 who expects $75,000 a year in retirement has a 75% replacement ratio. Keep both figures on the same basis, and state both at today’s prices.

The denominator needs care, because sources use different ones. Planners usually take final pay or, since a bonus, raise or cut in hours can distort a single year, an average of the last three to five years. SSA’s actuaries instead divide by career-average earnings indexed to wage growth, the basis of the Social Security table below.

A replacement ratio below 100% does not mean a lower standard of living. Part of a worker’s pay never reaches the household budget: it goes into retirement accounts or to payroll tax, and both stop at retirement. Government spending data show the shift. In the Bureau of Labor Statistics Consumer Expenditure Survey for 2024, households headed by someone aged 55 to 64 spent $11,447 on retirement, pensions and Social Security contributions; those headed by someone aged 65 to 74 spent $3,914. Total spending was $84,946 for the younger group and $65,354 for the older one, about 77% as much. These are different households rather than the same ones before and after retiring, but the gap lines up with the usual targets.

The Department of Labor notes that experts estimate you will need 70 to 80 percent of your preretirement income to maintain your standard of living. Treat that as a starting range, not a prescription.

The right figure depends mostly on how much of your pay you were not spending. A household that saved little and paid little income tax spent most of its income, so it may need 80% or more. A household that saved 25% of a high income may need 60% or less. Early retirees fit the ratio least well: with a very high savings rate, the target is better built from actual spending, which is how the FIRE approach works. Anyone expecting to pay off a mortgage, move somewhere cheaper, or travel heavily early on should adjust the range to match.

Social Security is built to replace a larger share of pay for lower earners. Your benefit, the primary insurance amount, comes from a formula that credits 90% of the first slice of your average indexed monthly earnings, 32% of the next slice and 15% of the rest. The table shows the result in SSA’s 2026 Trustees Report for hypothetical workers turning 65 in 2026: from about 74% of career-average earnings for a very low earner claiming at 67 to about 26% for someone at the taxable maximum every year.

Two cautions apply. The denominator is career-average earnings indexed to wage growth, which is usually below final pay, so the share of your last paycheck replaced is typically smaller than these figures. And the table shows scheduled benefits under current law; the same report projects that, without legislation, reserves for retirement benefits run out in late 2032, after which about 78% would be payable.

The ratio is quick because it skips the details, and the details are exactly where two retirement plans with the same income differ. It is best used as a first estimate or a cross-check on a budget, not as a substitute for full retirement planning. Once you have a real budget and benefit estimates, the budget should win, and the ratio becomes a way to see whether that budget looks unusually high or low for your income.