Can you afford the pay cut?

How the math works

Two levers set your FI date, and a career change can move both of them:

A pay cut only touches the second line: you invest less each year, so the date slides out. That's why the delay depends on your savings rate, not on the size of the cut in isolation — the same $20,000 cut is a rounding error to someone investing $60,000 a year and a catastrophe to someone investing $22,000.

Spending is the more powerful lever, because it touches both lines: spend less and your FI number falls and the amount you invest rises. That is the honest reason a career change to lower pay can still work — and the calculator will show you exactly how much of a spending cut it would take.

The FI-number formula is the standard safe-withdrawal framing (the "4% rule" from Bengen 1994 and the Trinity study — 4% → 25×). It assumes roughly a 30-year retirement, so for a long early-retirement horizon many planners use 3.25–3.5%; the rate is a slider, not a hidden constant. More on the 4% rule and where it breaks.

What a pay cut really costs — worked example

The calculator's default scenario: age 35 · $150,000 invested · take-home $90,000 → $65,000 · spending $55,000 · 5% real return · 4% withdrawal rate.

• FI number: $55,000 ÷ 4% = $1,375,000 — unchanged by the pay cut, because spending is unchanged.
• Invested each year: $35,000 today ($90,000 − $55,000) vs $10,000 after the cut. The cut took 28% of the pay — and 71% of the savings. That gap, not the pay cut, is what moves the date.
• The cost, in years: the calculator solves both cases and shows the difference — plus the age you'd still reach FI at, which is usually the number that decides it.
• The offset: switch "Spending after the change" to Changes too and drop it. Every dollar of spending you cut lowers the target by 25× that dollar and adds a dollar a year to what you invest.

Change any input in the calculator above to see your own numbers.

When this calculator says "never"

If the new pay is at or below your spending, you are not investing — you are drawing down. The tool says so plainly rather than printing a fake date. Sometimes the pot still outgrows the shortfall, and it will tell you that honestly too, along with the warning that a plan with no margin is a fragile one. Either way, the fix is the same two levers: the spending, or the income.

FAQ

How do I know if I can afford a pay cut?

Compare two things, not one. A pay cut lowers what you can invest each year (take-home minus spending), which pushes out the date your investments cover your spending — your financial-independence date. So the honest test is: how many years later does FI arrive on the new pay? The calculator above runs your numbers twice — today's pay and the new pay — and reports the difference in years.

How much does a pay cut delay financial independence?

It depends far more on your savings rate than on the size of the cut. Your FI date is driven by the gap between take-home pay and spending, so a cut that eats a small slice of a large gap barely moves the date, while the same cut applied to a thin gap can move it by many years. If your spending falls too, the delay shrinks twice over: you invest more of the new pay and your FI number itself goes down.

What if the new job pays more?

Then the calculator says so. It is not built to talk you out of anything: enter a higher new take-home pay and it shows your FI date arriving sooner, with the years you gain. Same when a career change lowers your spending enough to offset the cut — the result can be neutral, or better than neutral.

Should I use gross salary or take-home pay?

Take-home pay — the money that actually lands in your account after tax and payroll deductions. Only that money can be spent or invested, so it is what sets your savings rate. Gross salary would overstate what you invest each year and make every FI date look earlier than it is.

What does this calculator NOT model?

Quite a lot, deliberately. It assumes your take-home pay and spending stay flat in real terms (no raises, no lifestyle creep), it applies one steady real return instead of real market sequences, it ignores taxes on withdrawals, and it does not model employer matches, pensions, the cost of retraining, or a gap between jobs. It isolates one question — what the income change does to your FI date — and it is an estimate, not a forecast.

Is my data sent anywhere?

No. Every calculation runs in your browser. Your pay, spending and invested total are never sent to a server, never put in a shareable link, and there is no signup. If you choose to carry the numbers into a free FIManager plan, they ride in the URL fragment — which browsers never transmit to a server.

Related FI and FIRE calculators

• What is your FI number? →The formula, the 4% rule, and worked examples behind every number here.
• FI calculator →Your core FI number and a rough date to financial independence.
• Coast FIRE calculator →The smaller amount that grows to full FI on its own — stop saving, keep coasting.
• Barista FIRE calculator →How steady part-time income shrinks the portfolio you need to semi-retire.
• Lean FIRE calculator →Reach financial independence sooner on a deliberately frugal budget.
• Fat FIRE calculator →Fund a no-compromises, higher-spending early retirement.
• Chubby FIRE calculator →The comfortable middle band between lean and fat FIRE.