How Much to Save for Retirement Based on Your Actual Income
The fifteen percent rule fits some incomes and fails others. How to size your savings rate from your target, your start date and Social Security.
A person earning $42,000 who starts saving at 30 needs to put away about 7% of pay to retire at 67 on three quarters of their income. A person earning $140,000 who starts at 40 needs about 23%. The difference is not discipline or luck. It is mostly Social Security, which covers half the first person's retirement and a third of the second's.
The 15% rule is a reasonable average that fits nobody exactly. This piece shows how to build your own rate from three inputs, then works it for three earners. The order in which to put that money into accounts is covered in the 401k match and Roth vs traditional; this is about how much.
Where the percentage rules come from
Rules like "save 15%" come from working a middle-income case: a worker who earns a steady salary from their mid-twenties, retires in their mid-sixties and has an average Social Security benefit. For that worker, 15% including the employer match produces enough to replace most of their income. Change the salary, the start age or the retirement age and the answer moves, sometimes a long way.
The rule also hides an assumption about how much income you need in retirement. Most planning uses 70% to 80% of pre-retirement pay. You no longer pay Social Security tax, you no longer save for retirement, and work costs such as commuting fall away. We use 75% below.
Your replacement need
Your target is 75% of your gross pay before retirement, from all sources. Two sources will supply it: Social Security, and what you saved. The method is:
- Target income = 75% of your current pay.
- Gap = target income minus your estimated Social Security benefit.
- Savings needed = gap × 25, which is the balance that supports withdrawals of 4% a year. The reasoning behind that number is in the 4 percent rule.
- Savings rate = the yearly saving that grows to that balance by your retirement age, divided by your pay.
Everything below is in current dollars, with investment returns of 4% a year above inflation and pay that keeps pace with inflation. Using real returns keeps every figure comparable to the paycheck you have now.
Social Security's share by income
Social Security's benefit formula deliberately replaces more of low earnings than high earnings. It takes your average indexed monthly earnings and pays 90% of the first slice, 32% of the middle slice and 15% of anything above. For people first eligible in 2026, those slices break at $1,286 and $7,749 a month, the bend points published on SSA's benefit formula page.
| Steady career earnings | Monthly benefit at 67 | Yearly | Share of pay replaced |
|---|---|---|---|
| $42,000 | $1,866 | $22,392 | 53% |
| $78,000 | $2,826 | $33,912 | 43% |
| $140,000 | $3,813 | $45,756 | 33% |
These are approximations for a worker with 35 years of steady earnings at that level, in current dollars, using the 2026 formula. Your own estimate, from your actual earnings record, is on your my Social Security statement, and using it is better than using this table. How the formula works step by step is in how Social Security benefits are calculated.
Start age and the savings rate required, worked
Three earners, each retiring at 67 with a target of 75% of pay. Savings grow at 4% a year above inflation. The rate includes any employer match.
| Earner A | Earner B | Earner C | |
|---|---|---|---|
| Pay | $42,000 | $78,000 | $140,000 |
| Starts saving at | 30 | 25 | 40 |
| Target, 75% of pay | $31,500 | $58,500 | $105,000 |
| Social Security | $22,392 | $33,912 | $45,756 |
| Gap | $9,108 | $24,588 | $59,244 |
| Savings needed, gap × 25 | $227,700 | $614,700 | $1,481,100 |
| Years of saving | 37 | 42 | 27 |
| Savings rate needed | 6.6% | 7.5% | 22.5% |
| Rate if starting five years later | 8.6% | 9.6% | 30.9% |
The working for Earner B: the yearly saving that grows to $614,700 over 42 years at 4% is $614,700 ÷ 104.82, the future value factor for 42 annual payments, which is $5,864, or 7.5% of $78,000.
Three readings of the table. Earner A, on a modest income, does not need anything like 15%; trying to save 15% on $42,000 may cost them an emergency fund they need more. Earner B, starting early, also lands below 15%, and the extra margin is a cushion against lower returns. Earner C, a high earner who started at 40, needs nearly a quarter of pay, and if they wait five more years, close to a third.
A note of caution on the low figures: they assume 4% real returns and a full Social Security benefit for 37 to 42 years. If either disappoints, the low rate leaves little room. We would still aim Earner A and Earner B at 10% to 12% including the match, and treat the table as the floor.
What moves the number up or down
- Retiring at 62 instead of 67 raises the rate sharply: fewer years of saving, more years of withdrawals, and a Social Security benefit reduced by 30% if claimed at 62.
- Delaying Social Security to 70 raises the benefit by 24% over the age 67 amount, which lowers the gap. When to claim Social Security works through the trade.
- A pension reduces the gap by its yearly amount.
- A paid off house lets you plan on a lower target than 75%.
- Planning for reduced Social Security. The program's trustees project that, without changes in law, the trust funds will be unable to pay full scheduled benefits from the 2030s. Planning on 80% of your estimated benefit adds a margin; for Earner B that raises the rate to about 9.6%.
- Higher returns. At 5% real instead of 4%, every rate in the table falls by roughly 15% to 25%. We would not plan on it.
Turning the rate into a paycheck number
A percentage is easy to agree with and hard to act on. Convert it to dollars per paycheck, then to the setting in your benefits portal.
Earner C, at $140,000 and 22.5%, needs to save $31,500 a year. The 2026 limit for employee 401k contributions is $24,500, set by IRS Notice 2025-67. If the employer matches 4% of pay, that is $5,600 more. Together, $30,100. The remaining $1,400 can go to an IRA, though at this income a Roth IRA contribution may need the backdoor route because of income limits. Spread over 26 paychecks, Earner C's own contribution is about $942 a paycheck.
Earner A, at $42,000 and 6.6%, needs $2,772 a year. With a 3% match worth $1,260, they contribute $1,512 of their own: about $58 a paycheck, or 3.6% of pay. Most people are surprised how small their number is, or how large. Either surprise is useful, because it replaces a vague rule with a figure you can set today.
If the number is out of reach, start with the match and add one percentage point at every raise. A raise is the cheapest time to save more, because you never see the money in your take-home pay.
The match counts
The rate in the table is total saving, so your employer's match counts toward it. Earner B with a 50% match on the first 6% of pay contributes 6% and gets 3% from the employer: 9% in total, above the 7.5% target, from 6% of their own pay. Contributing less than the match is the one clear mistake in all of this.
The number, recomputed each year
This is not a calculation you do once. Each year, with your current balance and pay and your latest Social Security statement:
- Recompute the target and the gap.
- Subtract what your current balance will grow to by retirement at 4% real.
- Solve for the yearly saving that covers the rest.
If your balance is ahead, you can hold the rate. If it is behind, raise it, or plan to work a year or two longer, which helps from both sides at once. The checkpoints in how much you should have saved by 30, 40 and 50 are a rough cross-check.
A useful habit is to keep the yearly recalculation on one page: the date, pay, balance, Social Security estimate, the gap and the rate you set. Five years of those lines show whether you are converging on the target or drifting from it far more clearly than any single year's figure, and they make the decision to raise the rate, or retire a year later, a matter of reading a trend rather than reacting to a bad quarter in the market.
When this does not apply
If your earnings are very uneven. Self-employed people and anyone with long gaps out of work will have a Social Security benefit lower than the steady-earner figures in the table. Use your own statement.
If you plan to retire well before 62. Early retirement needs a balance that bridges the years before Social Security begins, and the gap × 25 shortcut no longer holds. The savings rate math behind early retirement is different.
If you carry high-interest debt. Capture the match, then pay off card balances before raising the retirement rate further.
If you expect a large inheritance or pension. Plan on what is certain. An inheritance that has not happened is not part of the gap calculation.
Next steps
- Download your Social Security statement and note your estimated benefit at 67.
- Work out 75% of your current pay, subtract the benefit, and multiply the gap by 25.
- Find your row in the table, or solve for your own rate with your start age.
- Set your 401k contribution so that, with the match, you reach that rate.
- Put a date on the calendar a year from now to recompute it with real numbers.
