Coast FIRE Number at 40
Starting late at 40 is common, and Coast FIRE is still possible. It just tends to land later, and two levers matter more than anything else now: how soon you raise contributions, and whether 65 is really your finish line.
Updated · 3 min read
| Yearly spending in retirement | FIRE number | Coast FIRE number at 40 |
|---|---|---|
| $40K | $1,000,000 | $385,777 |
| $60K | $1,500,000 | $578,665 |
| $80K | $2,000,000 | $771,554 |
| $100K | $2,500,000 | $964,442 |
Retiring at 65 with a 7% return, 3% inflation and a 4% withdrawal rate, in today's dollars.
How fast you get there from $200,000
Starting at 40 with $200,000 invested and planning to spend $60,000 a year, here's when you'd cross the line at different monthly contributions.
| Monthly contribution | Coast FIRE reached at |
|---|---|
| $500 | Not before 65 |
| $1,000 | Not before 65 |
| $2,000 | age 64 |
| $3,000 | age 53 |
At 40, being behind the table is normal. What’s different from your 30s is that every year you don’t act costs noticeably more, so the most useful thing you can do is decide on a contribution this year and treat your retirement age as a real variable rather than a given.
Why waiting hurts more now
Your target climbs a little faster every year, and you have fewer years left to catch it. At 30, putting off a savings increase for a year is annoying. At 40 it can push your Coast FIRE date back by more than the year you waited, because you’re chasing a number that’s moving faster while your money has less time to compound.
That’s also why “I’ll start once the kids are older” or “once this project wraps up” is expensive in your 40s. The plan you start in March beats the better plan you start next January.
Is 65 still the right finish line?
Our calculator starts at 65, but it’s worth asking whether that’s actually your plan. For anyone born in 1960 or later, Social Security’s full retirement age is 67, and claiming at 62 cuts your monthly benefit by about 30% for life. If you were going to work until 67 anyway, planning for 65 makes your Coast FIRE target look bigger than it is.
The reverse is true too. If 65 is a hard stop because of your health or your job, don’t move the age just to make the numbers look nicer.
What to prioritize in your 40s
Push your contribution as high as you can hold for the next ten years. Consolidate old workplace accounts rather than cashing them out, since early withdrawals usually mean income tax plus a 10% additional tax before 59 and a half. And check your fees. A fund charging 1% a year is a bigger drag on a catch-up plan than almost any other choice you’ll make.
Marcus at 40
Marcus spent most of his 30s building a small business and has $95,000 invested. He expects to spend $55,000 a year in retirement, so his Coast FIRE number is $530,443. He can put in $2,500 a month.
| Marcus’s plan | Coast FIRE age |
|---|---|
| $2,500 a month starting now, retire at 65 | 61 |
| Same, but he waits a year to start | 63 |
| $3,000 a month starting now, retire at 65 | 56 |
| $2,500 a month starting now, retire at 67 | 58 |
Waiting one year moves his date from 61 to 63. Finding another $500 a month or planning around 67 instead of 65 each pulls it in. If he did both, his Coast FIRE age would be 54, and the last stretch of his career would look very different from the one in the first row.
Run Marcus's numbers
Try his plan with a retirement age of 67 and $3,000 a month.
Other ages: 25, 28, 30, 31, 32, 35, 45, 50, 55. Or see every age on one table.
Run your own numbers at 40
Questions people ask
Is 40 too late for Coast FIRE?
No, but the goal changes shape. You're probably looking at reaching it in your 50s rather than your 40s. That still buys something real: your last several working years don't have to include retirement saving, which is exactly when a lot of people want to cut back or change jobs.
Should I plan to retire at 67 instead of 65?
Run both. Two more years gives your money more time to grow and lines up with Social Security's full retirement age for anyone born in 1960 or later. The cost is two more years of work, and only you can say whether that's worth it.
Should I cash out an old 401(k) to pay down debt at 40?
Almost never. You'd owe income tax plus, in most cases, a 10% additional tax for taking money out before 59 and a half, and you'd lose the growth on that money for the next 25 years. Roll it into your new plan or an IRA instead.