Coast FIRE Explained: Stop Saving Early, Still Retire

Most FIRE talk is about retiring early. Coast FIRE is quieter and, for a lot of people, more realistic: it's the point where you've invested enough that — even if you never contribute another dollar — compounding alone will grow your portfolio into a full retirement by your target age. You still work, but only to cover today's bills. Your future is already funded.

The idea in one sentence

Hit your Coast FIRE number, and you can stop saving for retirement and simply coast — downshift to a lower-stress job, go part-time, or take the leap you've been putting off — while your existing investments do the rest.

The math behind it

Coast FIRE works because compounding is exponential: the earlier a dollar is invested, the more of the final total it becomes. Your Coast FIRE number is just your full FIRE number discounted back to today:

Coast number = FIRE number ÷ (1 + real return)^{years to retirement}

A worked example

Say you're 30, you want the option to retire at 60, and your FIRE number is $1,000,000 (roughly $40,000/year of spending × 25). That's 30 years of growth. At a 5% real return, each dollar today multiplies about 4.3×, so:

$1,000,000 ÷ (1.05)³⁰ ≈ $231,000.

Once you have ~$231,000 invested at 30, you could stop retirement contributions entirely and still land near $1,000,000 by 60 — untouched. Plug your own return and time horizon into the compound interest calculator (set the monthly contribution to $0) to see your number.

Why people love it

• It arrives fast. Because the target is discounted by decades of growth, front-loading your savings rate in your 20s and early 30s can get you there surprisingly quickly.
• It buys freedom now, not just later. You don't wait until 60 to feel the payoff — you reclaim choices in your 30s and 40s.
• It lowers the pressure. Knowing retirement is handled makes a pay cut for better work feel like a decision, not a risk.

Coast FIRE vs. Barista FIRE

They're cousins. Coast FIRE means your investments are set and your job just covers living costs. Barista FIRE usually adds a specific perk — a part-time job kept mainly for health insurance or a little income to reduce withdrawals. Many people coast first, then barista later.

How to get there

The recipe is unglamorous and effective: invest early and heavily, keep costs low, and let time compound. Find your full number with the 4% rule, raise your savings rate while you're young enough for compounding to matter most, and check your progress against the 7 steps to financial freedom. Coast FIRE is often the very next milestone after your emergency fund and debt are handled.