Barista FIRE vs Coast FIRE: a data-driven comparison

Coast FIRE and Barista FIRE are often mixed up in headlines. Both can lower pressure versus classic full FIRE, but they answer different planning questions. Confusing them produces the wrong savings target and the wrong lifestyle story.

Definitions that actually compute

• Full FIRE number ≈ annual spending ÷ withdrawal rate (e.g. $60k ÷ 4% = $1.5M).
• Coast number ≈ full FIRE ÷ (1+r)^years until traditional retirement age — portfolio that may grow to full FIRE with zero future contributions.
• Barista number ≈ max(0, spending − work income) ÷ withdrawal rate — portfolio that funds only the gap while work covers the rest.

Worked comparison at $60k spending, 4% SWR, 5% real

• Full FIRE: $1,500,000
• Coast (age 35 → 65, 30 years): coast ≈ $1,500,000 ÷ (1.05)^30 ≈ $347,000
• Barista ($20k work income): gap $40k → barista number $1,000,000
• Barista ($30k work income): gap $30k → barista number $750,000

Notice the intuition trap: Coast can show a much smaller number than Barista because Coast is not funding early retirement spending from the portfolio — it is only asking whether growth can finish the nest egg by a later age while you still cover life with earnings. Barista is about semi-retirement cash flow now.

When Coast is the better frame

• You still plan to work (full- or part-time) for many years.
• You want permission to reduce savings rate or career intensity without claiming early retirement.
• Your question is “can compounding finish the job?” not “can I live on withdrawals + side income this year?”

When Barista is the better frame

• You want a near-term semi-retirement lifestyle with intentional work income.
• Benefits, structure, or purpose from work matter as much as the math.
• You need a portfolio target that funds a spending gap, not a distant full FIRE discount.

Shared risks (do not skip)

• Work income can be uneven; benefits can cliff.
• Sequence risk still matters if you withdraw from the portfolio.
• Taxes, healthcare, and housing can dominate spreadsheet gaps.
• Lifestyle creep can erase both Coast surplus and Barista gap math.

How to compare on RetireFire

Set one spending level and withdrawal rate in shared assumptions. Read Coast FIRE and Barista FIRE side by side. Export CSV or copy a share link so a partner sees the same scenario. Stress-test by lowering r and SWR. Methodology documents formulas; Our Approach documents limits and the roadmap for explicit stress tests.

Educational only — not advice. Use professionals for personal decisions.