How Much Do I Need to Retire?

Danny is 40. He earns $75,000 a year, has $80,000 in his 401(k), and every time he reads a headline about retirement, the number is different. One says $1 million. Another says $2 million. A coworker says “nobody can retire anymore,” which is not a number at all.

Your retirement number isn’t a mystery, and it isn’t someone else’s number. It comes from a few inputs you can look up or estimate tonight.

The short version of the method

Finding your number takes four steps:

1. Pick the yearly income you want in retirement, in today’s dollars.
2. Subtract what Social Security (and any pension) will pay. What’s left is the gap your savings have to cover.
3. Divide that gap by your withdrawal rate. With the 4% rule, that’s the same as multiplying by 25.
4. Adjust for inflation so you know what the number looks like in the year you actually retire.

Each step has a rule of thumb, and each rule of thumb has limits.

Step 1: How much income will you need?

The most common rule of thumb is that you’ll need 70% to 80% of your pre-retirement income to keep roughly the same lifestyle. It’s not 100% because some costs go away when the paychecks stop:

• You stop saving for retirement. If you put 10% of your pay into a 401(k) today, that 10% is no longer an expense.
• You stop paying Social Security and Medicare payroll taxes on wages (7.65% of pay for most employees).
• Commuting, work clothes and lunches out shrink.
• For many people the mortgage is paid off, or close to it.

Some costs go up, though. Health care is the big one, especially if you retire before you qualify for Medicare at 65. Travel and hobbies tend to be front-loaded in the first years of retirement. Home repairs don’t retire when you do.

So use 70–80% as a starting point, not a final answer. If you know your budget well, a better method is to build it from the bottom up: take what you spend today, remove the work and saving costs, add a realistic health care line, and see what’s left. If your house will be paid off, that alone can move your number a lot.

For Danny, 80% of $75,000 is $60,000 a year. That’s the income he wants, in today’s dollars.

Step 2: Subtract Social Security

Social Security covers part of most middle-class retirements, and every dollar it pays is a dollar your portfolio doesn’t have to produce.

Don’t guess this number. Create a free account at ssa.gov/myaccount and look at your statement. It shows your estimated monthly benefit at different claiming ages, based on your actual earnings record. It takes about ten minutes and it’s the single most useful thing you can do for your retirement math.

A few things worth knowing when you read that statement:

• For anyone born in 1960 or later, full retirement age is 67.
• You can claim as early as 62, but your monthly check is permanently reduced (by about 30% if your full age is 67).
• Waiting past full retirement age, up to 70, increases your benefit for every year you delay.

If you have a pension, add its yearly amount here too.

For this example, say Danny’s statement shows about $2,000 a month at 67. That’s $24,000 a year. (This is an example number for the illustration, not a typical benefit. Yours could be higher or lower. Look it up.)

His gap: $60,000 − $24,000 = $36,000 a year that has to come from savings.

Step 3: Turn the gap into a number with the 4% rule

The 4% rule says you can withdraw about 4% of your savings in your first year of retirement, then adjust that dollar amount for inflation each year, and have a good chance of the money lasting 30 years. It comes from 1990s research that tested withdrawal rates against historical US stock and bond returns, using a portfolio split between the two.

The math is simple. If 4% of your savings must equal your yearly gap, then:

Savings needed = yearly gap ÷ 0.04, which is the same as yearly gap × 25.

Danny: $36,000 × 25 = $900,000 in today’s dollars.

Notice what Social Security did there. Without it, Danny would need $60,000 × 25 = $1,500,000. That $24,000 a year of benefits is worth $600,000 of savings he doesn’t have to build.

The limits of the 4% rule

The 4% rule is a useful rule of thumb. It is not a guarantee, and it was built on assumptions that may not match yours:

• It assumes a 30-year retirement. Retire at 67 and that takes you to 97, which is plenty for most people. Retire at 55 and you might need the money for 40 years, which argues for a lower rate.
• It’s based on past returns. The future can be worse. Nobody can promise the next 30 years will look like the last 100.
• Bad timing hurts. A big market drop in the first few years of retirement, while you’re withdrawing, does more damage than the same drop 15 years in. This is called sequence-of-returns risk.
• It ignores taxes. Money in a traditional 401(k) or IRA is taxed when you withdraw it. If your gap is $36,000 of spending money, you may need to withdraw more than $36,000 to cover the tax.
• It ignores fees. A portfolio paying 1% a year in fees effectively leaves you a lower safe withdrawal rate.

Many planners use 3.5% (or lower) for early retirees or anyone who wants more margin. Here’s how the withdrawal rate changes the multiplier:

Half a percentage point moves Danny’s target by more than $100,000. That’s why it’s worth picking a rate deliberately instead of treating 4% as a law.

Step 4: Don’t forget inflation

Everything so far is in today’s dollars. But Danny won’t retire today. He’ll retire in 27 years, and prices will be higher by then.

At 3% inflation a year, prices roughly double every 24 years. To have the same buying power as $900,000 today, Danny needs:

$900,000 × 1.03²⁷ ≈ $1,999,160 at age 67.

That’s where the scary “$2 million” headlines come from. It’s real, but it’s the same $900,000 of buying power, just measured in future dollars. Both numbers are true. The today’s-dollar number is the one to use for judging whether a lifestyle is enough. The future-dollar number is the one your account balance has to actually hit.

Here’s why inflation matters for your plan, not just your target. If Danny ignores inflation and aims for $900,000 flat, the monthly savings to get there from $80,000 at a 7% return is about $437. Aim for the inflation-adjusted $1,999,160 and it’s about $1,629 a month. Ignoring inflation makes the plan look nearly four times easier than it is.

Danny’s full worked example

Putting it together, with the assumptions written out:

• Age 40, retiring at 67 (27 years to go)
• Wants $60,000 a year (80% of $75,000), today’s dollars
• Social Security example: $24,000 a year
• Already saved: $80,000
• Average return before retirement: 7% a year (an assumption, not a promise)
• Inflation: 3% a year
• Withdrawal rate: 4%

1. Gap: $60,000 − $24,000 = $36,000 a year
2. Target in today’s dollars: $36,000 ÷ 0.04 = $900,000
3. Target at 67: $900,000 grown by 3% for 27 years ≈ $1,999,160
4. His $80,000 grows on its own; the monthly savings needed to cover the rest ≈ $1,629

That’s a flat monthly amount for 27 years; starting lower and raising it with your pay works too. The $1,629 includes everything going into his retirement accounts: his 401(k) contributions plus any employer match. If his employer adds 3% of his salary, that’s $187.50 a month he doesn’t have to find himself. (How the match works is covered in 401(k) basics.)

Now let’s change one thing at a time to see what actually moves the number:

Three things jump out. Spending less in retirement is the most powerful lever, because it lowers the target and the monthly amount. Retiring two years earlier costs Danny about $220 a month more. And a lower return is brutal: the target doesn’t change, but he has to do a lot more of the work himself. That’s why planning with a modest return assumption is safer than planning with an optimistic one.

The same math for someone younger

Mia is 30, earns $60,000 and has $15,000 saved. She wants 80% of her income, $48,000 a year, and uses an example Social Security figure of $22,000. Her gap is $26,000, so her target is $650,000 in today’s dollars, or about $1,940,397 by 67. The monthly savings needed: about $885.

Her future-dollar target is nearly the same as Danny’s, yet she needs about half as much per month. The difference is ten extra years of growth. If you want to see why time does so much of the work, read compound interest explained simply.

Run your own numbers

Run your own numbers: put in your income goal, your Social Security estimate from ssa.gov/myaccount, and what you have saved.

Try 3.5% and a 5% return for a cautious version. If that still works, you’re in good shape.

If your number feels impossible

If your monthly figure is bigger than your rent, don’t quit. Look at the levers:

• Get the full employer match first. It’s money that counts toward your monthly target without coming out of your pay.
• Raise your savings rate with every raise. Moving 1% of pay a year into savings is barely noticeable and adds up fast.
• Work a little longer. Each extra year adds a year of saving, a year of growth, one fewer year to fund, and a bigger Social Security check if you delay claiming.
• Plan to spend less in retirement. A paid-off house or a smaller one can cut thousands from your yearly gap, and every $1,000 less is $25,000 less to save.

If you want to know whether you’re on track for your age right now, the checkpoints are in retirement savings by age.

What to do this week

1. Log in to ssa.gov/myaccount and write down your estimated benefit at 62, 67 and 70.
2. Pick your income goal. Start with 75% of your current gross pay, then adjust if you know your house will be paid off or you expect high health costs.
3. Add up every retirement account you have: 401(k)s from old jobs, IRAs, Roth IRAs.
4. Run the calculator twice: once with 4% and 7%, once with 3.5% and 5%. Your real answer is probably somewhere between.
5. Compare the monthly figure to what you save now, including your employer match. If there’s a gap, raise your contribution by 1% this week and set a reminder to do it again in six months.

Frequently asked questions

Is $1 million enough to retire?

It depends on your spending and your Social Security. Using the 4% rule, $1 million supports about $40,000 a year of withdrawals, before taxes. Add Social Security and that may cover a middle-class lifestyle. If you need $40,000 a year from savings on top of Social Security, $1 million is about right in today’s dollars. If you need more, it isn’t.

Does the 4% rule still work?

It’s still a reasonable starting point for a 30-year retirement with a balanced portfolio. It’s not a guarantee. If you’re retiring early, want extra safety, or are paying high fees, a rate around 3.5% is a more cautious choice. Many retirees also adjust spending in bad market years, which helps a lot.

How much will I get from Social Security?

Your personal estimate is at ssa.gov/myaccount. It’s based on your actual earnings history, so it’s far better than any average. Check it once a year and make sure your earnings record is correct.

Should I count my home equity?

Usually not, because you can’t withdraw 4% of a house you live in. A paid-off home helps indirectly by lowering the income you need. If you plan to downsize, count the expected cash conservatively.

Is the 70–80% rule right for me?

It’s a rule of thumb. If you save a lot now, your number could be lower because that saving stops in retirement. If you’ll still have a mortgage or expect big health costs before Medicare, it could be higher. Building a retirement budget from your current spending is more accurate.

Keep reading

• Am I Behind on Retirement? Savings Benchmarks by Age
• 401(k) Basics: Matching, Contributions and Mistakes to Avoid
• Compound Interest Explained Simply

Education, not financial advice. The numbers here are examples; talk to a licensed professional about your own situation. Some links may be sponsored or affiliate links; see our disclosure.