Your Savings Rate, Not Your Salary, Decides When You Can Stop Working

Two people, one salary, and nineteen years

Two 28-year-olds both earn $70,000. Both take home about $56,000 after tax. Both start from zero.

The first saves 10% of take-home pay. That is $5,600 a year invested and $50,400 a year spent. Because the target is 25 times annual spending, this person needs $1,260,000 to stop.

The second saves 25%. That is $14,000 a year invested and $42,000 a year spent, so the target falls to $1,050,000.

At a 5% real return, the first person gets there in about 51 years. The second gets there in about 32. Same paycheck, same market. Nineteen years.

Notice what happened to the target, though. The bigger saver is filling a smaller bucket, and filling it faster. Both effects come from the same decision, which is why the gap opens up so violently.

Step 1: Work out the savings rate you actually have

Do this before you look at any table, because a table without your own number in it is entertainment.

Add up what you saved last year. Every dollar that left your paycheck and did not get spent. Your 401(k) contributions, your IRA contributions, anything that went into a brokerage account, extra principal you paid down on debt. Count the employer match too, and I will come back to why.

Add up your take-home pay. Gross salary minus income tax and payroll tax. Then add your retirement contributions back on top, because those came out of your paycheck before you ever saw them and they are still money you earned.

Divide the first number by the second. That percentage is your savings rate. Nothing more complicated than that.

Most people are surprised, and usually in the wrong direction. The 401(k) deferral you set once at onboarding and never touched is doing more work than you thought. The cash sitting in your checking account that you were vaguely counting as savings is doing none at all until it's invested.

Two rules keep the number honest. Use take-home pay rather than gross, because the tax you paid was never available to save and counting it flatters your rate by several points. And use last year's real figures rather than this month's intentions. A savings rate describes what you did, not what you meant to do.

Step 2: See where your number sits

Compare it to everyone else's now. Not because the average is a target, but because you can't tell whether you're standing on the steep part of the curve or the flat part until you know roughly where you're standing.

The national picture is bleak. Personal saving as a percentage of disposable income, the series the Bureau of Economic Analysis publishes through the St. Louis Fed, ran at 2.8% in the second quarter of 2026, down from 5.0% a year earlier. At 2.8%, the arithmetic in this guide does not produce a retirement date at all. It produces a number longer than a working life.

The workplace picture is better, because automatic enrollment quietly fixed part of the problem. Vanguard's 2026 How America Saves report, which covers nearly five million workers, found the average participant deferred 7.6% of pay in 2025 with a median of 6.6%. Add employer contributions and the average total rises to 12.1%. Participants under 25 deferred 5.5%. Only 14% of participants saved the statutory maximum.

So if you calculated 12% in Step 1, you're roughly average among people who have a 401(k) at all, and well above average among Americans generally. Worth knowing. Also worth not resting on, because average on this curve still means most of your working life.

Step 3: Understand why the savings rate does two jobs at once

Your savings rate sits on both sides of the equation, which is the reason the effect is so much bigger than intuition suggests. Every extra point raises the amount going in. It also permanently lowers the amount you live on, and since the finish line is a multiple of your spending, the finish line moves toward you at the same time. A raise you spend moves neither. A raise you save moves both.

That's also why the salary matters less than it feels like it should. Double your income, keep your savings rate flat, and you've doubled the amount invested and doubled the target. The timeline doesn't move a day. This is lifestyle inflation doing its quiet work, and it's why high earners routinely arrive at 45 with a big salary, a big house and a short runway.

Compounding is the third participant and needs the least explanation. Money invested early earns returns, those returns earn returns, and the whole thing grows faster the longer it runs. The phrase that deserves more attention is real return, meaning the return after inflation has taken its cut. Everything here uses 5% real. That's a working assumption rather than a promise, and Step 6 shows you what happens when you lower it.

Then there's the employer match, the one free acceleration on offer. It's money added to your rate without anything leaving your pocket, and the 4.5-point gap between Vanguard's average deferral of 7.6% and its average total contribution of 12.1% is almost entirely employer money. If you're not capturing the full match, those are the cheapest five points you'll ever find.

Step 4: How your savings rate affects your retirement age

Read the assumptions before the numbers, because a table like this is only as good as what sits underneath it.

Assumptions: you start from zero. You earn 5% a year after inflation. You stop when your portfolio reaches 25 times your annual spending, which is the 25x rule, and it is just the 4% rule expressed as a target rather than a withdrawal. Your spending stays flat in real terms. No career breaks, no inheritance, no pension, no Social Security.

The formula behind it, if you want to check the work, is n = ln(1 + r × W × (1 − s) / s) / ln(1 + r), where s is the savings rate, r is the real return and W is the multiple of spending you are targeting. Everything in the table came out of that one line, and you can reproduce it in a spreadsheet in about a minute.

Two things jump out. The curve is very steep on the left and nearly flat on the right. And the band between 5% and 25%, where almost everybody actually lives, covers 34 years of working life.

Step 5: Price your next five points

Every guide presents the table above as a flat menu, as though a five-point increase is worth the same wherever you start from. It isn't. Not even close, and this is the part the rest of the internet skips.

• Going from 10% to 15% removes about 8.5 years
• 15% to 20% removes about 6.1 years
• 20% to 25% removes about 4.8 years
• 30% to 35% removes about 3.4 years
• 45% to 50% removes about 2.4 years

The first five points you add are worth roughly three and a half times the last five. Which means the person saving 8% and feeling hopeless about it has the most valuable five points available to anyone on the chart, and the person already saving 45% is grinding for the smallest prize on it.

I find this reassuring, and I didn't expect to. The usual framing of this topic makes modest savers feel like they're playing a game they've already lost. The arithmetic says the opposite. If you're near the bottom of the table, you're standing exactly where each point buys the most time, which is the same reason starting with $100 a month beats waiting until you have a rounder number to begin with.

It cuts the other way too, which the FIRE material rarely admits. Past about 40%, each extra point costs a lot of lifestyle and buys progressively less time. Nobody should pick a 70% savings rate because a chart said nine years. That's a way of living, and it wants choosing on its own terms.

Step 6: Run your own numbers before you trust the table

Take your rate from Step 1, then test what happens when the assumptions move. Two are worth stress-testing.

The return. Drop from 5% real to 4% and every row gets longer. At 10%, 51 years becomes 59. At 25%, 32 becomes 35. Nobody is owed 5%, and a decade of lower returns early in your saving life does real damage. That risk has a name and a shape, and it's worth understanding sequence of returns risk before you lean hard on any projection.

The withdrawal rate. The 4% convention is a convention. Morningstar's 2026 analysis of safe withdrawal rates puts the base case at 3.9% for a 30-year retirement from a portfolio holding 30% to 50% in equities, which implies a target of about 25.6 times spending rather than 25. A small difference on paper, and it adds months to every row.

Run both cases yourself. The SEC's compound interest calculator is free, neutral and takes about two minutes, and our own index investing calculator will do the same job with the contribution schedule already built in. Put in your current rate, then put in your rate plus five points, and look at the gap between the two dates. That gap is the entire argument of this guide, expressed in your own numbers.

Where this table breaks

Four things the model knows nothing about, all of which matter.

It assumes your spending stays flat. Real spending is lumpy. Children, a mortgage, a parent who needs help, a move to a more expensive city. Every one of those resets the target, because the target is a multiple of what you spend.

It assumes an unbroken career. Layoffs, caring responsibilities and deliberate time out all interrupt contributions during exactly the years when compounding has the longest runway ahead of it.

It assumes you have tax-advantaged room. The 2026 elective deferral limit is $24,500, and once your savings rate pushes past that on a middling salary the surplus lands in taxable accounts where the drag is real.

And it assumes the target itself is right. Time to financial independence is defined here as reaching 25 times spending, full stop. Social Security, a pension, part-time work or a paid-off mortgage all change what that number needs to be, usually downward.

None of this makes the table useless. It makes it a direction of travel rather than a date, useful for comparing two choices and not for writing anything in a diary.

In summary

The checklist version, if you want to act on one thing this week:

1. Calculate your savings rate from last year's real numbers. Savings divided by take-home pay, with retirement contributions added back to both.
2. Place yourself on the curve. Below 15% puts you on the steep part, where the payoff per point is biggest. Above 40% and you're grinding for small gains.
3. Read the years figure rather than the dollar figure. Dollars are abstract at 28. Years aren't.
4. Price your next five points using the marginal list in Step 5, not the headline table in Step 4. Early points are worth multiples of late ones.
5. Capture the full employer match first. It's the only increase that costs you nothing.
6. Re-run it every year. Your rate moves with every raise you do or don't spend.

What's worth holding onto is that five points is a change to the rest of your life measured in years, and it's available to almost everyone at almost every income. Far more useful than the 15% rule. Nobody leads with it.