Coast FIRE: The FIRE Strategy Where You Stop Investing and Let Compounding Finish the Job
Coast FIRE is a personal finance milestone within the Financial Independence, Retire Early (FIRE) movement where an investor has already saved and invested enough that, left untouched, compound growth alone will grow the portfolio to their full retirement number by a chosen future age — meaning they no longer need to add new contributions to reach that goal, though they may still work to cover current living expenses.
Not financial advice. All figures for educational reference only. Data as at August 2026. Last updated: August 2026.
Key Takeaways
- Reaching Coast FIRE doesn’t mean you stop working entirely — it means your existing invested portfolio is projected to compound to your full retirement target without further contributions, so any income you earn afterward is just for current spending.
- The calculation depends heavily on your assumed investment return rate and the number of years until your target retirement age — a longer runway means a smaller current portfolio can ‘coast’ to the same eventual goal.
- Singapore investors calculating Coast FIRE often separate CPF (which compounds toward retirement independently via mandatory contributions and guaranteed interest) from their own SRS/brokerage portfolio when deciding how much more they personally need to invest.
- Coast FIRE is distinct from full FIRE (having enough to stop working and live off withdrawals immediately) and Barista FIRE (working part-time or lower-stress work to cover expenses while investments continue compounding).
- Reaching Coast FIRE earlier in life gives more flexibility to pursue lower-paying but more fulfilling work, since the pressure to keep maximising retirement contributions is reduced.
What Is Coast FIRE?
The broader FIRE movement is built around calculating a target ‘number’ — typically 25x your annual expenses, based on a roughly 4% safe withdrawal rate — that lets you stop working and live off your portfolio indefinitely. Coast FIRE reframes this goal around time rather than immediate withdrawal: instead of asking ‘do I have enough to retire today’, it asks ‘have I already saved enough that, purely through compound growth with no further contributions, my portfolio will reach my full retirement number by the time I actually want to retire’. This distinction matters because compound growth does most of the heavy lifting over long time horizons — someone who front-loads aggressive saving and investing in their 20s and 30s can potentially reach Coast FIRE well before their peers, even if their current portfolio looks modest compared to a full FIRE number.
How Does Coast FIRE Work in Singapore?
To estimate your Coast FIRE number, you work backward from your full retirement target using a compound growth formula: Coast FIRE Number = Full Retirement Number ÷ (1 + expected annual return)^(years until retirement). The longer your remaining time horizon and the higher your assumed return, the smaller your required current portfolio. For Singapore investors, a common approach is to calculate this separately for CPF (which grows via mandatory salary contributions plus guaranteed OA/SA/RA interest rates, largely independent of personal saving discipline) and for a self-directed SRS or brokerage portfolio, since combining them without adjustment can understate how much more personal investing is actually needed if CPF alone won’t cover the full retirement goal.
Coast FIRE Example
Rachel, 30, has a self-directed investment portfolio (excluding CPF) worth S$150,000 and wants to retire at 60 with a target of S$1,200,000 in that same portfolio (using a separate, more conservative estimate for what CPF LIFE will additionally cover). Assuming a 7% average annual real-terms return over 30 years, S$150,000 would compound to roughly S$1,141,000 — just short of her S$1,200,000 target, meaning she isn’t quite at Coast FIRE yet but is close. If her portfolio reaches approximately S$158,000, compounding alone at the same assumed rate would be projected to hit her S$1,200,000 goal by age 60, after which she could theoretically stop adding new contributions to that specific goal (though many people keep contributing anyway to retire even earlier or build in a margin of safety).
Advantages of Coast FIRE
- Reduces long-term financial pressure — once you’ve reached Coast FIRE, you have more freedom to pursue lower-paying, more meaningful, or more flexible work without derailing your eventual retirement.
- Rewards early, consistent investing — front-loading contributions when young lets compounding do more of the work later, which is the core mechanic behind Coast FIRE.
- Works alongside CPF’s structure — Singapore’s mandatory CPF contributions already function as a form of forced ‘coasting’ toward part of your retirement number, complementing a self-directed Coast FIRE strategy.
- Provides a clear, motivating milestone — unlike the sometimes-distant full FIRE number, Coast FIRE offers an earlier, more achievable checkpoint to track progress against.
Risks and Limitations
- Highly sensitive to return assumptions — a small change in your assumed annual return rate significantly changes your required Coast FIRE number, especially over shorter remaining time horizons.
- Doesn’t account for inflation if not modelled carefully — using nominal (not inflation-adjusted) return assumptions can overstate how close you actually are to a meaningful Coast FIRE milestone in real purchasing power terms.
- Requires continuing income for current expenses — reaching Coast FIRE doesn’t mean you can stop earning entirely; you still need income to cover today’s living costs while your portfolio compounds untouched.
- Market downturns can set back the timeline — a significant market drop after reaching Coast FIRE can require resuming contributions or extending the target retirement age to stay on track.
Coast FIRE vs Full FIRE vs Barista FIRE
All three are FIRE-movement milestones, but they differ in how much you still need to work and contribute.
| Aspect | Coast FIRE | Full FIRE | Barista FIRE |
|---|---|---|---|
| Further contributions needed? | No, compounding alone reaches the goal | No, you can already fully retire | Some, via part-time/lower-stress work |
| Still need to work? | Yes, to cover current living expenses | No, portfolio covers all expenses | Yes, part-time or flexible work |
| Portfolio at milestone | Smaller, but on track to grow to full target | Full retirement number already reached | Partial, supplemented by ongoing part-time income |
| Typical timing | Often reached earlier in life | Reached last, after full accumulation | Flexible, can be reached at various stages |
| Best suited for | Those wanting career flexibility while young | Those prioritising complete work independence | Those wanting a gradual transition out of full-time work |
The Bottom Line
Coast FIRE is less about stopping work and more about removing the pressure to keep aggressively saving once your existing portfolio is projected to compound to your retirement goal on its own — for Singapore investors, calculating it accurately means treating CPF and your self-directed portfolio as separate compounding tracks rather than lumping them together.