Coast FIRE means letting existing investments grow toward a later retirement while other income covers today’s bills. Barista FIRE combines paid work with portfolio support. Lean FIRE and Fat FIRE describe lower- and higher-spending versions of financial independence. These are informal community terms, not regulated financial products or universal dollar thresholds. Here is the working distinction we use at FireFolio.
Compare the cash flows first
The labels describe two different things: how much you plan to spend and whether work still funds part of life. A person can coast toward a modest or an expensive eventual retirement. Choose the cash-flow pattern first, then give it a budget.
| Approach | What pays current bills? | What happens to investments? | Main question |
|---|---|---|---|
| Coast FIRE | Work or other non-portfolio income | Remain invested for a later retirement | Can I stop contributions while still covering living costs? |
| Barista FIRE | A mix of work and portfolio withdrawals | May be drawn down before full retirement | How much reliable work income closes the gap? |
| Lean FIRE | The funded retirement plan; paid work is optional | Support a deliberately low spending level | Is this budget sustainable and flexible enough? |
| Fat FIRE | The funded retirement plan; paid work is optional | Support a higher spending level | Which extra spending is worth the larger target? |
1. Coast FIRE: stop adding before you stop working
The central idea is to leave retirement investments untouched while earnings cover current expenses. WalletBurst’s explanation and calculator offer a way to explore that threshold. Reaching it depends on the time remaining and the growth and withdrawal assumptions you choose; it is not a permanent status independent of markets.
A simplified illustration: a $1 million future target discounted over 20 years at 4% annual real growth is about $456,000 today, using target ÷ (1 + real return)^years. This is arithmetic under a constant-return assumption, not a forecast or a withdrawal-safety test. You still need a current budget that balances without portfolio withdrawals.
Sources: WalletBurst · Coast FIRE calculator ↗ (opens in a new tab)
2. Barista FIRE: combine work with portfolio support
In this guide, Barista FIRE means paid work covers part of living costs and investments cover the rest. It need not involve a coffee shop, and employment benefits should never be assumed without checking the actual job. If take-home work income fully covers your budget and investments remain untouched, the arrangement fits our Coast definition more closely.
For example, $40,000 of annual spending and $25,000 of take-home earnings leave a $15,000 annual gap before any additional withdrawal taxes or costs. The gap can change if hours, health, or pay change. A plan that works only with uninterrupted part-time earnings needs an explicit fallback and a date when work eventually ends.
3. Lean FIRE: fund a smaller recurring budget
Lean FIRE emphasizes a lower-cost lifestyle with enough resources to make paid work optional. There is no single annual spending ceiling that fits every location, household size, or health need. Start with a real budget rather than adopting a number used by someone living in a different situation.
The practical challenge is flexibility. If the budget already contains mostly essentials, a spending reduction after a difficult market year may be hard. Compare your minimum workable budget with a more comfortable one, and include replacements and care costs in both.
4. Fat FIRE: fund a larger lifestyle deliberately
Fat FIRE describes financial independence with a larger spending budget. Travel, housing, family support, or paid convenience can make the target materially higher. A bigger balance alone does not make a plan safer if spending rises just as quickly.
Separate spending you value from spending you would readily cut. A larger discretionary budget may offer flexibility, but only if you would actually reduce it. Compare the additional years of saving with the life those extra expenses buy; there is no obligation to maximize either the portfolio or the retirement date.
Choose your next decision, not a permanent label
Ask three questions: must I keep earning, will I withdraw from investments now, and what annual spending do I want later? Those answers tell you more than the label. You can move between approaches as your responsibilities and preferences change.
Use a Coast tool for a no-contribution threshold, a scheduled retirement model for income that eventually ends, and a cash-flow worksheet for bills due today. FireFolio’s simple planner supports later-starting income but does not give that income an end date; do not model a short-lived job as lifelong income there. Advanced mode offers multi-stream schedules and starts a separate plan.
Read the original.
- SEC Investor.gov · Compound Interest Calculator ↗ (opens in a new tab)
Public calculator for a starting investment, contributions, time, and assumed interest rates.
- WalletBurst · Coast FIRE calculator ↗ (opens in a new tab)
Coast threshold explanation with growth, inflation, contributions, and retirement-age inputs. Reviewed October 21, 2026.
The FIRE application and exercises are FireFolio’s original interpretation. No affiliation or endorsement is implied. Sources checked October 21, 2026. Educational material, not individualized investment advice.