How to reach Coast FIRE faster

The short answer

The biggest levers you control are avoiding high investment fees, planning to spend less in retirement and saving more each month. In our example, each moved the coast date forward by more than two years. Expecting higher returns moves it furthest on paper, but it's a bet, not a plan.

Below, we measure all seven levers against the same starting point, rank the six you control, and show how far you can pull each. If you're new to the idea, start with what is Coast FIRE.

The starting point

We use Alex, our standard example: 32, retiring at 60 on $40,000 a year, with $185,000 invested and $1,500 a month going in. Our default assumptions include no fees and a 4% withdrawal rate, which gives a FIRE number of $1,000,000. The 4% rate comes from historical studies of 30-year retirements.

Alex needs $300,277 invested today to coast. Saving steadily, Alex gets there in 7 years 7 months, at 39, with about $417,000 invested. Every lever below works on one of the two lines that meet at the coast date:

• Your portfolio, which climbs faster if you add more money or it grows faster.
• The coast line, the amount you need at each point in time, which drops if your FIRE number is smaller or you have longer until retirement.

Every figure here comes from the same engine as our Coast FIRE calculator, described on our methodology page. We change one thing at a time.

The levers, ranked

How much a lever helps depends on how hard you pull it, so we picked a realistic size for each. The table ranks them by months saved against Alex's 7 years 7 months.

Among the levers you control, fees, spending and saving are roughly tied. The fee row uses a different starting point because Alex's base case pays no fees; for someone paying 0.5%, the base coast date is 10 years 8 months.

Levers that add money

1. Save more each month

The most direct lever. Each extra dollar goes straight into the portfolio line:

The returns diminish: the first $250 a month saves 15 months, the next $250 saves 11. For US savers, tax-advantaged accounts are the usual place for extra money. As of 2026, you can contribute up to $24,500 a year to a 401(k) and $7,500 to an IRA. If Alex saved the full 401(k) amount, about $2,042 a month, the coast date would be 5 years 4 months. Any employer match is money added on top, so it counts toward this lever too.

Here's a surprise: saving more each month can mean contributing less in total. At $1,500 a month, Alex puts in $136,500 before coasting. At $2,000 a month, Alex puts in $130,000, and at $3,000, just $126,000. Money added earlier has longer to grow, so less of it is needed, and the years of saving end sooner.

2. Raise your contributions every year

Increasing your monthly saving by a fixed percentage each year, on top of inflation, is painless if you tie it to pay raises. It helps less than you might expect, because the big increases come in later years when you're already close:

• 2% a year: 7 years 1 month (6 months saved)
• 3% a year: 6 years 10 months (9 months saved)
• 5% a year: 6 years 6 months (13 months saved)

It's still worth doing, especially combined with other levers, as you'll see below.

3. Cut your investment fees

Fees come straight off your return every year, and the coast date is very sensitive to return. Starting from Alex's fee-free base, paying 0.2% a year pushes the date to 8 years 9 months, 0.5% to 10 years 8 months, and 1% to 14 years 6 months. That means switching from a 1% fee to 0.2% saves 69 months, and from 1% to 0.05% saves 80. In dollars, someone paying 0.5% contributes $192,000 before coasting, against $141,000 at 0.05%: $51,000 more out of pocket for the same result. The SEC's investor bulletin shows the same effect on a portfolio's value. Our guide to how fees delay FIRE covers where fees hide and how to find yours.

4. Invest a lump sum

A bonus, tax refund, inheritance or the proceeds of selling something all go straight into the portfolio. They count only if they're invested, not parked in cash:

• $5,000: 7 years 2 months (5 months saved)
• $10,000: 6 years 9 months (10 months saved)
• $25,000: 5 years 8 months (23 months saved)
• $50,000: 4 years exactly (43 months saved)

A rough rule from these numbers: each $1,000 invested now saves about one month. That's not a surprise, because Alex adds $1,500 a month, so a lump sum is like several months of saving done in advance, plus the growth on it.

Levers that shrink the target

5. Plan to spend less in retirement

Your FIRE number is your retirement spending divided by your withdrawal rate, so every $1,000 of yearly spending you don't need takes $25,000 off the target. The coast line drops with it:

This lever works best when it's real: paying off a mortgage before retirement, planning to move somewhere cheaper, or counting a pension. Subtract Social Security or another pension from your spending only if you'll retire around the age it starts; if you'll stop earlier, you also need to fund the gap years until it begins. Our Canada and UK guides cover the same issue for CPP, OAS and the State Pension. Cutting the number on paper without a reason just moves the risk into the future. For how a frugal target compares with a generous one, see Lean FIRE vs Fat FIRE.

6. Retire a little later

Each extra year before retirement gives your money another year to grow, so you need less today. Retiring at 61 brings Alex's coast date to 6 years 7 months, at 62 to 5 years 9 months, at 63 to 4 years 11 months, and at 65 to 3 years 6 months. The cost is real, though: these are years at the end of your career, and you may not get to choose them if health or the job market intervenes.

The risky lever: higher returns

7. Invest for more growth

Raising the expected return from 7% to 7.5% brings Alex's coast date to 4 years 11 months, and 8% brings it to 2 years 10 months. At 9%, Alex could coast today. No other lever comes close, which is exactly why it needs care.

A more stock-heavy portfolio has historically earned more. From 1928 to 2025, US stocks returned about 10% a year and a 75% stock, 25% bond mix about 9%. But the extra return came with bigger swings and deeper drops, and there's no guarantee the future matches the past. Choosing an allocation changes what you can expect; it doesn't change what you'll get.

The lever also works in reverse, and not symmetrically. One point more than 7% saves 57 months, but one point less, 6%, pushes Alex's coast date out to 14 years 6 months, 83 months later. With a lower return, your portfolio closes the gap with the coast line more slowly, so each point lost costs more time than a point gained saves. That asymmetry is a good reason to plan with a modest return and let any upside surprise you pleasantly.

If you do invest more aggressively, a cautious approach is to keep planning with the lower return and treat any extra growth as a buffer. Our guide to real vs nominal returns covers how to choose a return assumption.

Combining small changes

Levers add up, and several small moves can beat one big one:

The first row is the double dividend of spending less. If Alex trims $250 a month from everyday spending and keeps it trimmed, that money is saved now and the lower spending carries into retirement, so it moves both lines at once.

What's really in your control

A lever that saves many months on paper is only useful if you can pull it and keep it pulled. Fees are the clearest case: once you've moved to low-cost funds, the benefit continues every year without further effort. Spending and saving depend on habits that have to last. Returns and windfalls depend on things outside your hands.

One more point. Whichever lever you pull, the coast date is still based on average returns. In our simulations, stopping exactly on the new date reached $1,000,000 by 60 about half the time in every case, and saving three years past it raised the odds to roughly 57% to 62%. Pulling levers gets you there sooner; it doesn't make the date more certain. Our guide to Monte Carlo simulations explains what those odds mean, and what to do after Coast FIRE covers how to keep a buffer once you're there.

Sources

The coast dates and odds are our own calculations, explained on our methodology page. Facts and research come from:

1. 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500. Internal Revenue Service, 2025. The 2026 limits on what employees can contribute to 401(k), 403(b) and similar plans, and to IRAs.
2. How Fees and Expenses Affect Your Investment Portfolio. US Securities and Exchange Commission, Investor Bulletin, 2014. Shows how ongoing fees of 0.25%, 0.5% and 1% compound over 20 years.
3. Historical returns on stocks, bonds and bills (annual data from 1928). Aswath Damodaran, NYU Stern School of Business, updated January 2026. Our calculations from this data: from 1928 to 2025, US stocks (the S&P 500 with dividends) returned about 10% a year, and a mix of 75% stocks and 25% 10-year Treasury bonds returned about 9% a year with yearly swings (standard deviation) of about 15%.
4. Determining Withdrawal Rates Using Historical Data. William P. Bengen, Journal of Financial Planning, 1994. The original 4% rule: a 4% first-year withdrawal, raised each year with inflation, lasted at least 30 years in every historical US period studied.
5. Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable. Philip L. Cooley, Carl M. Hubbard and Daniel T. Walz, AAII Journal, 1998. The “Trinity study”: withdrawals of 3% to 4% rarely ran out of money over periods of up to 30 years with a mix of stocks and bonds.