Staged Coast FIRE

What does “staged” mean?

Classic Coast FIRE asks whether an invested balance can grow into a retirement target without further contributions. You work and save until a single switch date, then earn enough to pay current bills while the portfolio compounds. It is an appealingly simple picture. Real careers, though, rarely have one clean switch. A person may save hard, take a two-year break, return to full-time work, move to a lower-paid role, and later start drawing a small amount from investments. A single “stop saving” age hides those transitions.

Staged Coast FIRE gives each chapter its own age range and annual net investment flow. A positive flow adds money to the portfolio; zero means day-to-day income pays day-to-day spending; a negative flow is a withdrawal. The ranges use whole ages. A phase from 35 to 40 applies at ages 35, 36, 37, 38 and 39. At age 40 a new phase may begin. If no phase covers an age, its net flow is zero. This lets you model a gap without inventing a job or contribution.

The portfolio starts with your current invested balance. For each year, multiply by one plus the assumed real return, then add that year's net flow at year end. “Real” means after inflation, so every number stays in today's purchasing power. The same return is used every year. The model is a transparent planning illustration, not a forecast of market returns. It does not include taxes, fees, sequence risk or changing spending. Those omissions matter most if a phase contains withdrawals.

How it differs from Barista FIRE

Barista FIRE usually describes earning enough from a less demanding job to cover some or all current costs, possibly including health benefits, while investments keep growing. It is a lifestyle and income arrangement. Staged Coast FIRE is a way of calculating a sequence of arrangements. A Barista phase can be one chapter of that sequence. If its earnings exactly cover spending, set its net flow to zero. If it still allows saving, use a positive number. If it leaves a shortfall paid from the portfolio, use a negative number.

That distinction matters because a zero-flow decade after a saving sprint can be very different from a decade of modest withdrawals. Even a small annual draw loses its own future compounding. The year when it occurs also matters: an early draw has more time to affect the final balance. The calculator therefore applies each flow to its specific year and plots the balance at every birthday. It also tests whether the account goes below zero before retirement. A final target alone cannot reveal an earlier shortfall.

Three complete examples

1. Classic Coast at age 30

Suppose you are 30, plan to retire at 60, expect to spend $40,000 per year, and use a 4% safe withdrawal rate. The retirement target is $40,000 divided by 0.04, or $1,000,000. With a 5% real annual return and no contributions in any year, the amount required today is about $231,377. Thirty annual growth steps bring that sum to roughly $1,000,000. This is the pure Coast case: you can stop adding to investments today if the assumed return arrives and you earn enough elsewhere to cover all pre-retirement spending.

There is no stage list to fill in for this example. An empty list means each year has a zero net flow. It does not mean you stop working or that living costs disappear. It means those costs and any income are outside the investment balance. If your actual balance is below $231,377, the gap must come from future contributions, a later retirement date, lower spending, or a different assumption. Raising the real return simply to erase the gap can create false confidence.

2. Save, coast, then draw

Now begin at age 35 with $200,000 invested. Retire at 60 with the same $40,000 annual spending, 4% withdrawal rate and 5% real return. From 35 through 39, add $30,000 at the end of each year. From 40 through 49, add nothing. From 50 through 59, withdraw $10,000 at each year end. Enter these as phases 35–40 at +$30,000, 40–50 at $0, and 50–60 at −$10,000. Their boundaries touch but never overlap.

The calculated balance at 60 is about $991,326. The $1,000,000 target is missed by about $8,674. Keeping every phase unchanged, the initial balance required to meet the target is about $202,561, just $2,561 above the stated starting balance. This is why the inverse answer is useful: it translates a distant target miss into a decision you can consider today. The example does not imply that $2,561 is a robust safety margin. A steady 5% real return is an assumption, and the model contains no tax or market-volatility buffer.

3. A withdrawal plan that runs out

Finally, suppose you are 50 with $10,000, assume 0% real return, and plan to retire at 55. Enter a phase from 50 to 55 that withdraws $3,000 each year. At the end of the year starting at 50, $7,000 remains. The next balances are $4,000 and then $1,000 after the year starting at 52. The withdrawal during the year starting at age 53 takes the balance to −$2,000. The calculator reports “depleted at age 53.” It keeps the annual detail visible so you can see exactly which year caused the warning.

A negative investment balance is not a viable portfolio plan. The warning is deliberately stronger than a retirement-target warning because this example cannot fund the planned withdrawals on the stated terms. Change the draw, find income to cover some of it, start with more money, or move the phase. A higher retirement balance years later would not repair an earlier year in which the plan needs cash it does not have.

Read the other outputs carefully

The FIRE number is annual retirement spending divided by the safe withdrawal rate. It is a planning target, not a guarantee that a particular withdrawal rate is safe for every horizon or portfolio. The “today needed” number works backward from the target and checks every intermediate year for a nonnegative balance. It assumes the specified stages and return stay fixed. If you change a phase, the answer changes.

The earliest age to stop saving has a narrow meaning. For each candidate age, positive phase flows from that age forward are set to zero; existing zero and negative flows stay as entered. The candidate must avoid depletion and finish at or above the FIRE target. An age of “none feasible” means stopping contributions at any tested age fails under the current plan, even if the current plan itself may be close. It is not advice to keep a particular job until retirement. It is a calculation about investment flows.

Use the staged Coast FIRE calculator to edit up to six phases and share every input through the URL. If you are considering retiring abroad, start from a destination profile: its cost estimate can prefill annual retirement spending. The local budget is an editorial estimate for a typical couple, with a review date and range. Treat it as a starting point and replace it with your own housing, healthcare and travel budget before relying on a result.