How much money do I need to retire at 45?

A Sunday evening, and a sentence nobody planned to say

Meera is thirty. Arjun turns thirty-one in March. On a Sunday evening in Pune, between clearing the dinner plates and the week’s first work message, one of them says it out loud: what if we did not need a salary after forty-five? They do not want to stop working. They want work to become a choice, not an obligation.

That sentence is not a financial plan yet. It is a wish about time. To turn it into a number, start with one honest input. It is not a return assumption. It is the cost of an ordinary month at home, not the month they wish they were having.

So they start there. Rent that will become a home-loan EMI, groceries, fuel, two phone bills, school fees arriving long before any college fund. The list is boring, and boring is exactly what makes it usable.

The month is the unit that makes a corpus real

Their ordinary month lands near ₹50,000. Some are ₹42,000, a few are ₹68,000 because an insurance premium fell due or there was a wedding in the family, so they average a full year rather than a flattering month.

That single figure carries more weight than any market assumption, because a corpus is really just the monthly life multiplied out and then paid for from savings instead of salary. A household spending ₹30,000 a month and one spending ₹1,00,000 a month are not making the same plan, even if they are aiming at the same birthday.

• ₹30,000 a month is ₹3.6 lakh of spending a year to fund
• ₹50,000 a month is ₹6 lakh a year
• ₹75,000 a month is ₹9 lakh a year
• ₹1,00,000 a month is ₹12 lakh a year

Why one magic number keeps breaking

Meera’s first instinct is to ask for the number, one figure they can write on the fridge and chase. The trouble is that the gap they are planning across is fifteen years long, and a ₹6 lakh year does not politely stay a ₹6 lakh year.

At 5% inflation, today’s spending roughly doubles over fifteen years, and at 6% it grows faster still. Neither rate is a forecast. They are handles you turn to see how fragile the answer is. Returns are not guaranteed, and inflation staying where it is today is not guaranteed either.

This is the real problem with a magic number. It is precise about a future nobody can see, and completely silent about how wrong it might be. A number that survives being questioned is worth more than one that merely sounds confident.

So they test several futures instead of chasing one

Their question changes shape that evening. Instead of asking what corpus do we need, they start asking what happens to the answer if we turn out to be wrong in the ways we are most likely to be wrong.

A conservative view assumes 6% returns alongside 6% inflation. A base view assumes 9% returns with 5% inflation. An optimistic view assumes 12% returns with 5% inflation. Three futures, three savings paths, and no claim that any one of them will actually arrive.

The calculator below asks for the same things they wrote down at the kitchen table: current age, the age they are aiming at, monthly spending today, what they have already put aside, an inflation assumption and a withdrawal rate. Change one input and watch the answer move. That movement is the lesson, more than the digits are.

What the model just did, in plain language

There are only two steps underneath the result. First, today’s yearly spending is aged forward to the year you turn 45, so the plan is priced in the rupees you will actually be spending then. Second, that future yearly figure is divided by your withdrawal rate, and what comes out is the corpus estimate.

A 4% withdrawal rate means the corpus works out to twenty-five times the spending year. A 5% rate means twenty times, and a 3% rate means a little over thirty-three times. The rate is the biggest single lever on the answer, and it is entirely an assumption that you pick.

Expected return does not move that corpus at all. It moves the monthly saving needed to reach it. A higher assumed return makes the path look gentler while quietly making the plan more dependent on markets behaving.

The 4% rule is a US shortcut, not a guarantee

The 4% figure comes from studies of long-run American market and inflation history, largely built around a thirty-year retirement. It travelled widely because it is easy to remember, not because it was designed for an Indian household.

Retiring at 45 stretches that assumption in two directions at once. The money may need to last forty years or more, and Indian inflation, tax treatment and market history are not the ones the shortcut was drawn from. Tax on withdrawals, and the fact that a retirement here often quietly supports parents or a sibling, both sit outside a tidy percentage.

Treat 4% as a dial rather than a law. Lower it and the corpus becomes uncomfortable to look at. Raise it and the plan leans harder on markets, and on the order in which returns happen to arrive in your first few years without a salary.

From a page you read to a plan you keep

Meera and Arjun do not end the evening with a fridge number. They end it with a range, three scenarios, and a monthly saving figure that they can either afford or cannot, which is itself the most useful thing the exercise produced.

A calculator gives you a snapshot. What actually changes behaviour is watching the estimate sit beside your real balance month after month, and updating the spending figure when life changes: a bigger home, a school admission, a parent moving in, a deliberate career break.

Open FIRE Planner with these assumptions already filled in, keep your own numbers there, and revisit them once or twice a year. The value was never the corpus. It is noticing early, while fifteen years of choices are still ahead of you, that the plan needs adjusting.