FIRE with a home loan: should you repay your loan or invest?

Nearly every Indian on the FIRE path runs into this fork in the road, and it can feel genuinely agonising. You have some surplus at the end of the month. Do you throw it at the home loan to be debt-free sooner, or do you invest it and let compounding work? Older relatives will tell you a loan is a burden to crush as fast as possible. Spreadsheet-minded friends will tell you investing wins. Both can be right, and the good news is there is a clean way to decide rather than going with your gut or your guilt.

The core comparison: certain saving versus uncertain return

Strip away the emotion and it comes down to comparing two things. Prepaying your loan gives you a fixed, known benefit equal to the interest rate you avoid paying. Clear a rupee off a 9% loan and you have effectively saved that 9% in interest, with no dependence on markets. Investing instead offers an expected return that may be higher over the long run, but it carries market risk and nothing about it is assured.

So if your loan is at 9% and you assume equity might return 11 to 12% over a long horizon, investing looks better on paper. But notice the caveats doing quiet work in that sentence: on paper, over the long run, if the assumption holds. Over a short horizon, or if markets disappoint, the certain 9% saved by prepaying could easily turn out to have been the better call.

Rule of thumb: if your expected after-tax investment return comfortably beats your loan rate over your time horizon, investing tends to win. If the two are close, the certainty of prepaying is worth more than the small expected edge.

Why the maths is not the whole answer

Here is where pure spreadsheet logic misses something that matters enormously for FIRE. A paid-off home does two lovely things that a bigger portfolio does not. First, it directly lowers your annual expenses, which shrinks your FIRE number, because you are no longer funding an EMI. Removing a ₹40,000 monthly EMI cuts nearly ₹5 lakh a year from the spending your corpus has to support, which at a 3.5% rate is well over a crore off your target.

Second, it removes a fixed, non-negotiable obligation. That matters more than it sounds, because early retirement is all about flexibility. When a bad market arrives, a retiree with no EMI can simply spend less and wait it out. A retiree still carrying a loan cannot skip the payment, which forces them to sell investments at the worst possible time, feeding straight into sequence of returns risk. Being debt-free is, in effect, a defence against your own worst market years.

What most people actually do

Because the two goals both have merit, many FIRE-minded people refuse to pick just one. They invest the bulk of their surplus to capture the long-run growth, while making modest extra prepayments each year to chip the loan down and buy that peace of mind. As they approach their retirement date, they often tilt harder towards clearing the loan, so they enter early retirement with no fixed obligations hanging over them. It is not the mathematically optimal answer in a bull market, but it is the one that lets you sleep, and in a decades-long plan, sleeping well has real value.

See both paths in numbers: in the FIRE Planner, model "loan cleared" by lowering your expenses, and "kept investing" by raising your corpus, and compare which gets you to freedom in better shape.