Compute the smaller portfolio you need if you keep part-time income in retirement.
Barista FIRE number
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Years to reach
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Portfolio gap to bridge
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The number that shrinks when you keep working a little
Full financial independence asks your portfolio to cover every dollar you spend. Barista FIRE changes the question. If a part-time job still brings in some income, your investments only have to cover the gap between your spending and that paycheck. That gap, divided by your safe withdrawal rate, is your Barista FIRE number, and it is dramatically smaller than the full figure. This tool does that subtraction for you, then projects how many years of saving and compounding it takes to get there from where you are today.
The name is literal. Starbucks famously offers health insurance to employees working roughly 20 hours a week, and for many early retirees the real prize is not the wages but the employer health plan that bridges the years before Medicare eligibility at 65. A 50-year-old buying an unsubsidized ACA marketplace plan can easily face $700 to $900 a month in premiums. A part-time job that hands you group coverage erases that line item and lets your portfolio stay invested.
How the gap drives the target
The math is two short steps. First, the calculator subtracts your part-time income from your annual spending to find the gap your portfolio must fund. Second, it divides that gap by your withdrawal rate. At the default 4% rate, dividing by 0.04 is the same as multiplying by 25, the well-known rule of thumb from the Trinity Study on sustainable withdrawals. A larger paycheck shrinks the gap, and the target falls faster than most people expect because of that 25x multiplier working in reverse.
A $60,000 lifestyle with a $30,000 side job
Say you spend $60,000 a year and your part-time work nets $30,000 after tax. The gap is $30,000. At a 4% withdrawal rate, your Barista FIRE number is $30,000 divided by 0.04, which is $750,000. Full FIRE for the same lifestyle would need $60,000 divided by 0.04, or $1.5 million. The part-time income cuts the target in half, a $750,000 saving. Starting from a $200,000 portfolio and adding $30,000 a year at a 5% return, the tool walks the balance forward year by year and reaches $750,000 in 11 years.
| Step | Figure |
|---|---|
| Annual spending | $60,000 |
| Part-time income (net) | $30,000 |
| Gap the portfolio funds | $30,000 |
| Barista number (gap / 4%) | $750,000 |
| Full FIRE number ($60k / 4%) | $1,500,000 |
| Years from $200,000 at 5% | 11 years |
Where the model is optimistic
Two assumptions deserve a hard look. The first is that your part-time income is reliable and indexed to inflation. Retail and gig schedules can be cut, and $30,000 today buys less in ten years, so revisit the figure as you go. The second is the withdrawal rate. A 4% rate was calibrated for a roughly 30-year retirement. If you barista-FIRE at 45 and the part-time phase later ends, your portfolio may need to last 45 years or more, and many planners trim to 3.25% or 3.5% for horizons that long. Lowering the rate in the tool raises the target, which is the honest tradeoff.
A practical tip from working with early-retirement clients: keep the part-time income just under the ACA premium-subsidy cliff in the years you are buying your own coverage. Because you control how many shifts you take, you can often land modified adjusted gross income in the range that qualifies for premium tax credits, turning a $700 monthly premium into something far smaller. That single lever frequently does more for the plan than another year of saving.
Is Barista FIRE the same as Coast FIRE?
No. Coast FIRE means you have saved enough that you stop contributing entirely and let compounding carry you to a full retirement number by 65, while your job income only covers current spending. Barista FIRE means you have already quit the full-time career and are living partly off the portfolio now, with part-time work plugging the gap. Coast is about coasting on past savings; barista is about a reduced work life starting today.
Should I count Social Security in this calculation?
Not in the portfolio target itself. This tool sizes the nest egg you need before any government benefit arrives. Once you reach claiming age, Social Security becomes another income stream that, like your part-time wages, shrinks the gap your portfolio must cover. Many people model the pre-benefit years with this calculator and then treat Social Security as a later cushion that lets them spend more or de-risk the portfolio.