What is Barista FIRE?
Barista FIRE means leaving full-time work before you can afford to retire completely and living on part-time income, with your investments covering any shortfall. Your Barista FIRE number is how much you need invested on the day you switch to part-time so your savings still reach your full FIRE number by the age you stop working altogether.
How the calculator works
The calculator splits your life into three stretches: full-time work, part-time work, and full retirement. You choose the age each one starts. It then follows your money one year at a time, in today's dollars, through all three.
Each part-time year
net = part-time pay + pensions − spending − health insurance before 65Part-time pay is after tax. If the net is positive, it's invested at the end of the year. If it's negative, the shortfall comes out of your savings at the start of the year.
Spending during part-time years can differ from spending in retirement. Health insurance is separate because in the US many people lose employer coverage when they go part-time, and it stops counting at 65, when Medicare starts.
Your Barista FIRE number
The calculator starts from the FIRE number you need at full retirement and works backward one year at a time to the day part-time work begins. Each step asks what balance you'd need at the start of that year to cover its withdrawal and still be on track for the next one.
need(R) = FIRE number
need(t) = withdrawal(t) + max(0, (need(t + 1) − deposit(t)) ÷ (1 + r))R is the age you retire fully and r is your return after inflation and fees. need at the age you go part-time is your Barista FIRE number.
Working backward catches something a single formula misses. If your savings run dry in year three of part-time work, a later year with spare income can't bring them back. A shortcut that only checks your balance at retirement would call that plan fine. The backward method won't.
The lowest part-time income that works
The result also shows the smallest part-time income that keeps your plan on track with the savings you'll have. The calculator finds it by searching: more part-time income always means less you need saved, so it narrows in on the exact amount. If your plan already works, this tells you how far your part-time income could drop.
Three worked examples
Example 1: how much you need when part-time starts
A 35-year-old plans to work full-time until 45, then part-time until 60, earning $40,000 a year after tax while spending $60,000. Full retirement starts at 60 on the same $60,000 a year.
| Age today | 35 |
|---|---|
| Part-time ages | 45 to 59 |
| Part-time income per year | $40,000 |
| Spending per year while part-time | $60,000 |
| Retire fully at | 60 |
| Spending per year in retirement | $60,000 |
| Return after inflation | 5% |
| Withdrawal rate | 4% |
| FIRE number at 60 | $1,500,000 |
|---|---|
| Taken from savings each part-time year | $20,000 |
| Barista FIRE number at 45 | $939,498 |
| Needed today, saving nothing more | $576,771 |
| Classic Coast number, no part-time years | $442,954 |
Part-time pay leaves a $20,000 gap every year from 45 to 59, and it comes out of savings. That's why this person needs $939,498 at 45 rather than just enough to grow into $1,500,000. To get there without saving another dollar, they would need $576,771 invested today.
Example 2: how much part-time income you need
Now say the same person is 45, has $800,000 invested, and is ready to go part-time. Everything else stays the same.
| Age today | 45 |
|---|---|
| Invested today | $800,000 |
| Part-time ages | 45 to 59 |
| Part-time income per year | $40,000 |
| Spending per year while part-time | $60,000 |
| Retire fully at | 60 |
| Spending per year in retirement | $60,000 |
| Return after inflation | 5% |
| FIRE number at 60 | $1,500,000 |
|---|---|
| Barista FIRE number at 45 | $939,498 |
| Short at 60 | $290,007 |
| Lowest part-time income that works | $52,800 |
$800,000 is less than the $939,498 this plan needs, so at $40,000 a year it reaches 60 with $290,007 less than it needs. Raising part-time income to $52,800 a year would make the plan work with the $800,000 already invested. Working full-time for a few more years or spending less could also help, and the calculator shows how much as you change those numbers.
Example 3: when part-time pay covers everything
A 50-year-old with $650,000 invested plans to work part-time until 62. They spend $45,000 a year and pay $9,000 a year for health insurance until Medicare starts at 65. Part-time work brings in $54,000 after tax, enough for both.
| Age today | 50 |
|---|---|
| Invested today | $650,000 |
| Part-time ages | 50 to 61 |
| Part-time income per year | $54,000 |
| Spending per year while part-time | $45,000 |
| Health insurance before 65 | $9,000 a year until 65 |
| Retire fully at | 62 |
| Spending per year in retirement | $45,000 |
| Return after inflation | 5% |
| Withdrawal rate | 4% |
| FIRE number at 62 | $1,151,475 |
|---|---|
| Barista FIRE number at 50 | $641,184 |
| Can go part-time at | 50 (today) |
| Lowest part-time income that works | $53,053 |
Part-time pay covers spending and insurance, so savings aren't touched from 50 to 61 and simply grow. The FIRE number is a little higher than $45,000 divided by 4% because insurance still costs $9,000 a year from 62 until 65. With $650,000 already invested, the plan works from today, and part-time income could fall to $53,053 a year and the plan would still work.
Barista FIRE vs Coast FIRE
Both plans let your investments do the rest of the work while you keep earning. The difference is how much you earn. With Coast FIRE, your job covers all of your spending and your savings are left alone. With Barista FIRE, you earn less and your savings fill the gap, so you need more invested before you switch.
Example 1 shows how big that difference can be. If this person's job covered all $60,000 of spending until 60, they would need the classic Coast number of $442,954 today. Because part-time pay falls $20,000 short each year, they need $576,771 instead.
If you expect your job to cover your bills, start with the Coast FIRE calculator. If you plan to cut back first, this one fits better. What is Coast FIRE? explains how the different kinds of FIRE relate.
Why Barista FIRE calculators give different answers
- Whether part-time years draw on savings. Some calculators assume part-time pay covers all your spending. If it doesn't, the shortfall comes out of your savings, which can raise the number a lot.
- Checking only the end point. A simple formula looks at whether you reach your FIRE number at retirement. It can miss a plan that runs out of money partway through the part-time years.
- Health insurance. In the US, insurance before 65 can cost as much as rent. Leaving it out makes part-time work look cheaper than it is.
- Pensions and Social Security. Income that starts during or after the part-time years lowers what you need, and most calculators leave it out.
- Return before or after inflation. A 7% return minus 3% inflation is not the same as a 4% real return, and the gap adds up over decades.
What this calculator doesn't do
- Part-time income is a steady after-tax amount you enter. The calculator doesn't model taxes on wages or self-employment.
- Health insurance before 65 is a flat amount. There are no premium estimates and no checks on subsidy income limits.
- Withdrawals are taxed at one flat rate, with no brackets, Roth rules or penalties for early access to retirement accounts.
- The main result uses one steady return. If you're drawing on savings during your part-time years, a market drop early in that stretch would hurt more than the same drop later.
- It doesn't model death or survivor benefits, and Social Security and pension amounts are whatever you enter.
The methodology page lists every simplification in the model.
Common questions
How much do I need for Barista FIRE?
Enough that, after part-time pay, your savings can cover each year's shortfall and still reach your full FIRE number by the time you stop working. That depends on how big the shortfall is and how long the part-time years last, which is why the calculator works it out year by year.
How much part-time income do I need?
The calculator shows the lowest part-time income that keeps your plan on track. In Example 2 above, it's $52,800 a year. If your plan already works, the same figure shows how far your part-time income could drop.
Do I have to cover health insurance?
If you're in the US and your part-time job doesn't come with coverage, yes, until Medicare at 65. Enter what you expect to pay each year and the calculator adds it to every part-time and retired year before 65.
Where does the name come from?
It comes from the idea of taking a job at a coffee shop, partly for the health benefits, once your savings can carry most of the load. Any part-time or lower-paid work counts: consulting, seasonal jobs, or fewer hours in your current field.
Can I keep saving during part-time years?
Yes. If your part-time income is more than your spending and insurance, the extra is invested at the end of each year and keeps growing until you retire.
Is Barista FIRE better than Coast FIRE?
Neither is better. Coast FIRE needs less saved but keeps you working full-time longer. Barista FIRE lets you cut back sooner but needs more saved first. Running both calculators with your own numbers shows what each one asks of you.
Sources
- Cooley, Philip L., Carl M. Hubbard and Daniel T. Walz. "Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable." AAII Journal, February 1998. Usually called the Trinity study.
- Jeske, Karsten (Early Retirement Now). The Safe Withdrawal Rate Series. earlyretirementnow.com/safe-withdrawal-rate-series
- Shiller, Robert J. Monthly US stock prices, dividends, earnings, consumer prices and long-term interest rates since 1871. shillerdata.com
- US Social Security Administration. Retirement benefits. www.ssa.gov/benefits/retirement
- US Social Security Administration. my Social Security (your personal benefit estimate). www.ssa.gov/myaccount
- Government of Canada. Canada Pension Plan. www.canada.ca/en/services/benefits/publicpensions/cpp.html
- Government of Canada. Old Age Security. www.canada.ca/en/services/benefits/publicpensions/old-age-security.html
- GOV.UK. The new State Pension. www.gov.uk/new-state-pension
- GOV.UK. Check your State Pension forecast. www.gov.uk/check-state-pension
- Services Australia. Age Pension. www.servicesaustralia.gov.au/age-pension
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