Coast FIRE India: The Number Where You Can Stop Investing

Priya is 31. She has been working at a Pune IT firm for seven years, and for the last four of those she has been investing ₹40,000 every month without fail. She has ₹22 lakhs in mutual funds and is genuinely proud of it. She should be.

But she is also tired. Tired of watching every expense, tired of saying no to weekend trips, tired of the low-level anxiety that comes from tracking a savings rate like a performance review. She has started wondering: is there ever a point where I can just... stop? Where the money I already have does the rest on its own?

The answer is yes. And it has a specific number attached to it.

What Coast FIRE Means

Coast FIRE is the corpus size at which you can completely stop making new investments — no more SIPs, no more lump sums, nothing — and still reach your full FIRE number by your target retirement age through compounding alone.

The name comes from the image of a car cresting a hill and then coasting to the destination with the engine off. You have done the hard work of climbing. Now gravity (compounding) carries you the rest of the way.

The important clarification: coasting does not mean retiring. You still work. Your salary still covers your living expenses. You simply stop the investment contributions. The corpus you have already built grows on its own at market returns, and by the time you hit your retirement age, it has grown into your full FIRE number.

For people burning out under a high savings rate, this is meaningful relief. You go from running at maximum effort — salary minus heavy savings equals a constrained life — to a pace where your income covers your actual life and you let time do the rest.

The Formula

The Coast FIRE number is simply your full FIRE number discounted back to today at your expected investment return. In other words: how much do you need right now, invested and left alone, to grow to your FIRE target in n years?

A few things worth noting about how this works in practice. First, you are not trying to predict exact returns — you are using 12% as a reasonable long-run Nifty CAGR to get a directional number. Second, the formula assumes you reinvest everything and do not withdraw during the accumulation phase. Third, the further away your retirement, the smaller your coast number — compounding does more work over more years.

This last point is counterintuitive but important. A 28-year-old with 27 years until retirement needs a far smaller coast number than a 40-year-old with 15 years. Time is the actual lever here, not the return rate.

Coast FIRE Numbers by Age and Retirement Target

The table below gives you Coast FIRE numbers for the most common scenarios: different starting ages, different FIRE targets, retirement at 55. Everything is in today's rupees. Your money compounds at 12% but your target grows with 6% inflation, so what does the work here is the gap between them, a real return of about 5.7%. These are the numbers worth bookmarking.

Assumes 12% nominal CAGR (Nifty equity), 6% inflation, retirement at 55, no withdrawals during accumulation. The FIRE Target column and the coast numbers are both in today's rupees, so compare that last figure straight against what you hold right now.

Two things jump out of this table. First, starting early is worth more than anything else you can do. A ₹3 crore target costs you ₹57.5L if you are 25 and ₹1.31 crore if you are 40. Same retirement, more than double the corpus, and the only difference is fifteen years of compounding you either used or did not. Every year you wait adds about 5.7% to what you need.

Second, these numbers are larger than most Coast FIRE tables you will find, and that is deliberate. A lot of them discount your target at a nominal 12% while quoting the target in today's money, which silently assumes your cost of living never rises. It does. Correcting for that roughly triples the honest coast number, which is inconvenient but is the figure you would rather be working with.

Priya's Numbers

Back to Priya. She earns ₹18 LPA in Pune. Her target retirement lifestyle is ₹60,000/month in today's money — a reasonable middle-class life, not extravagant. She wants to retire at 55.

Step one: calculate her full FIRE number.

Step two: calculate her Coast FIRE number. She is 31, wants to retire at 55 — that is 24 years.

Priya needs ₹58.2 lakhs to have coasted.

She has ₹22 lakhs. So no, not yet.

But look at what she actually learned. She sat down expecting to measure herself against ₹2.18 crore, a number so far away it is not really a target at all, more of a weather forecast. Her real next milestone is ₹58 lakhs. And if she keeps the ₹40,000 going, she gets there at about 42, not 55. Twenty-four years of full-effort saving collapse into eleven, and everything after that is optional.

That is the useful thing about a coast number even when you have not hit it. It converts a distant, abstract corpus into a near one with a date on it.

What “Coasting” Actually Looks Like in Practice

Hitting your coast number does not mean you wake up the next day and cancel all your SIPs. It means you have permission to — and you should think carefully about whether you want to.

Most people who reach Coast FIRE do one of three things:

One practical note: coasting works best when the corpus is in growth-oriented instruments — predominantly equity mutual funds — that can realistically deliver 12% over a long horizon. If a large portion is in FDs or debt funds earning 7%, your coast number is much higher (you need more upfront to compensate for lower compounding). The formula assumes you stay invested in equity for the duration.

The Catch: Inflation Eats Your Coast Number Too

Here is what this means in practice. Priya calculated her FIRE number as ₹2.18 crore based on ₹60,000/month in today's money. At 6% inflation, five years from now ₹60,000 of purchasing power costs roughly ₹80,000/month in nominal terms. Because the table already works in today's rupees that does not change her ₹2.18 crore target. What changes is the runway: at 36 she has 19 years left rather than 24, so her coast number climbs to about ₹76.6 lakhs.

Meanwhile her corpus, at ₹22 lakhs plus the ₹40,000 a month, gets to roughly ₹55.8 lakhs. The gap narrows from ₹36 lakhs to ₹21 lakhs while she is not looking. That is the shape of it: the target rises as your runway shortens, and you close on it anyway as long as you keep investing. Recalculate every two to three years, especially if your lifestyle target or your retirement age moves.

The practical rule: treat your coast number as the floor, not a precision target. Building a 15–20% cushion above it before you reduce contributions is sensible. Markets are not a 12% escalator every year — they are lumpy, and a bad sequence in the early coasting years can push your actual corpus well below the theoretical projection.

Coast FIRE vs Barista FIRE vs Lean FIRE

These three terms get conflated constantly. They are meaningfully different.

Coast FIRE is a milestone on the way to full FIRE — it is not a substitute for it. Barista FIRE is a semi-retirement that relies on part-time income to bridge the gap. Lean FIRE is full retirement on a minimal budget. They solve different problems for different people.

Many Indian FIRE journeys pass through Coast FIRE first: hit the coast number, ease off the savings throttle for a few years, maybe switch to a less intense job, and then cross into full FIRE at 52–55. It is a reasonable middle path for people who want the pressure to lift before they are fully ready to stop.

“The most underrated FIRE milestone is not the final number — it's the one where you can stop trying so hard, and just let time work.”

So What About Priya?

Priya opened a spreadsheet this morning expecting to feel behind. She had ₹22 lakhs and a vague sense that ₹2+ crore was a long way away.

What she found was not that she had already won. It was that she had been aiming at the wrong number. ₹2.18 crore is another twenty-four years of her life. ₹58 lakhs is eleven, at the rate she is already going, and she is more than a third of the way there. After that her corpus finishes the job on its own and every rupee she earns is hers to spend.

Which changes what the next eleven years are for. She keeps the ₹40,000 going, because at this stage it is doing more work than anything else will. But she also stops treating 55 as the only date that matters, and she takes the trip to Goa she has been postponing for two years. There is a difference between saving towards something and saving against a fear, and knowing the nearer number is what moves you from one to the other.

The math did not change. Her FIRE plan did not change. But the pressure — that low-level background hum of not enough, not fast enough — that can be turned down now. She earned that.

If you are reading this and you have been investing steadily for several years: go run the numbers. Your coast number might already be in your rearview mirror.