Coast FIRE in India: how much do you need to invest before you can stop?
Full FIRE can feel like a marathon you have to sprint the entire way, saving furiously for fifteen or twenty years before you are allowed to breathe. Coast FIRE is the movement’s gentlest and, for a lot of people, most realistic variant. The idea is simple and quietly brilliant: invest hard and early, hit a certain number, and then stop adding new money entirely. From that point, compounding alone grows your pot into a full retirement fund by the time you are older. You just have to coast.
The word "coast" is doing real work here. Once you reach your Coast number, you no longer need to save for retirement at all. You only need to earn enough to cover today’s living costs. Retirement is already, in effect, taken care of by the investments you made early and the decades of compounding still ahead of them.
How the Coast FIRE number works
Your Coast FIRE number is the amount that, if you never add another rupee and returns hold up over the long run, could grow into your full FIRE number by your target retirement age. It is basically your future target run backwards through assumed compounding to today. The crucial insight is that the more years you leave for compounding, the smaller that number is, because time is doing the heavy lifting instead of your salary. Just remember the growth is an assumption, not a promise.
Example, purely illustrative: suppose you will need ₹3 crore at 55, and you assume around 9% annual growth. Roughly ₹75 lakh invested by age 35 would, at that assumed rate, reach about ₹3 crore over 20 years with no further contributions. Real returns vary year to year and are not guaranteed, so treat this as a rough illustration, not a projection.
Sit with that example for a second, because it is genuinely striking. A 35-year-old who has built ₹75 lakh has, in a real sense, already funded their retirement. Everything they earn after that can go towards living now rather than saving for later. That is a profoundly different relationship with work than most people ever get to have.
Why Coast FIRE appeals so much
The magic of Coast FIRE is psychological as much as financial. The moment you hit the number, an enormous weight lifts. You can drop to a job you actually enjoy even if it pays less. You can take a sabbatical, switch careers, freelance, or start something of your own without the terror of derailing retirement. You stop treating every rupee as a saving to be maximised, because the future is already handled.
It is the same freedom that full FIRE promises, reached in stages instead of all at once, and for many people the first stage is the one that changes their life the most.
You can check your own Coast number in the FIRE Planner: set your current corpus and expected return, add no further SIPs, and see whether it reaches your target by your retirement age. If it does, you are already coasting.
Coast FIRE is one of a family of approaches. To see where it sits, compare it with the spending-level variants in Lean FIRE vs regular FIRE vs Fat FIRE and with the part-time-income approach in Barista FIRE explained.