Sinking Funds: How to Budget for Yearly Expenses in India

Most months, your budget works fine. Then one month the health insurance renews, the school asks for the annual fee, and your scooter insurance is due, all within three weeks. Suddenly you’re dipping into savings, or putting ₹40,000 on a credit card, for costs you knew were coming all along.

These aren’t emergencies. They’re on the calendar. The problem is that your budget only thinks one month at a time. Sinking funds fix that. They’re the simplest idea in personal finance, and once you set them up, the expensive months stop being scary.

What a sinking fund is

A sinking fund is money you set aside every month for one specific cost that doesn’t happen every month.

Your health insurance renews once a year for ₹18,000. Instead of finding ₹18,000 in one month, you put ₹1,500 aside every month for twelve months. When the renewal comes, the money’s already there. You pay it, and your normal budget doesn’t even notice.

That’s it. A sinking fund is just an envelope for a future bill. In envelope budgeting, it sits next to Rent and Groceries like any other envelope. The only difference is that you don’t spend from it this month. You’re paying your future self in small instalments.

Sinking fund vs emergency fund

People mix these up, and it matters.

An emergency fund is for things you can’t predict. A job loss, a hospital bill that insurance doesn’t cover, a laptop that dies the week before a deadline. You hope you never touch it.

A sinking fund is for things you know are coming. You just don’t pay for them monthly. Insurance renewals, school fees, festivals, a phone that’s getting slow. You fully expect to spend it.

If you use your emergency fund for predictable costs, it’s never there when a real emergency hits. Keep them separate. The emergency fund calculator helps you size the emergency fund. Sinking funds are everything else.

What needs a sinking fund

Go through last year’s bank and UPI history and look for anything bigger than a few thousand rupees that didn’t happen every month. Common ones in India:

• Health insurance. Your own policy, or a top-up on your parents’ policy.
• Vehicle insurance and servicing. For a scooter, bike or car.
• School fees. Annual fees, admission charges, books and uniforms at the start of the year.
• Diwali and other festivals. Gifts, clothes, sweets and the trip home. We wrote a whole guide to a Diwali budget.
• Phone replacement. Phones don’t last forever. Plan for the next one now.
• Travel. The one proper trip you take each year.
• Weddings and gifts. Friends’ and cousins’ weddings come in seasons, and each one can cost a few thousand rupees in gifts and travel.
• Yearly subscriptions. Domain renewals, annual app plans, an Amazon Prime membership.
• Property tax or society maintenance, if you pay them yearly.

You won’t have all of these. Most people have four to seven.

An example: yearly costs divided by twelve

Here’s a family of three on a ₹1 lakh take-home salary. They have a scooter, one child in school and parents who get gifts every Diwali.

₹1,32,000 a year looks frightening. ₹11,000 a month, on a ₹1 lakh salary, is 11%. Very manageable when you plan for it, and very painful when you don’t.

If you don’t have kids, drop the school fees row and the monthly total falls to ₹8,500. If you’re single and don’t own a vehicle, it might be ₹4,000 or ₹5,000. Want to see where sinking funds fit in a full monthly budget? The ₹1 lakh salary budget shows one way to split the whole thing.

Starting late: the catch-up maths

The table assumes you have twelve months. Often you don’t. Your health insurance renews in four months and you haven’t saved anything.

That’s fine. Divide by the months you actually have. ₹18,000 over four months is ₹4,500 a month. Tight, but now you know. You can find ₹4,500 by trimming Eating out and Shopping for a few months, or you can pay part of it from the sinking fund and the rest from that month’s budget.

After the renewal, go back to the normal ₹1,500 a month. By the next renewal you’ll have the full ₹18,000 without any squeeze.

Don’t try to start every sinking fund at once if it means a ₹15,000 jump in one month. Start with whatever’s due soonest, then add one or two more each month.

Where to keep the money

The money needs to be safe, easy to reach when the bill comes, and out of sight the rest of the time. Some options:

A separate savings account. The simplest choice. Pick a bank that isn’t linked to your UPI apps, so the money isn’t one tap away. Move the full monthly amount on salary day.

A recurring deposit. If the cost is a fixed amount on a fixed date, like school fees in April, an RD that matures just before the date works well. It forces the saving and you can’t casually spend it.

One account, tracked by envelope. You don’t need seven accounts for seven sinking funds. One savings account can hold all of them. Just keep a note, or a sheet, of how much of the balance belongs to each one.

Whatever you choose, avoid keeping sinking fund money in anything that can lose value. This is money you know you’ll need on a specific date.

How sinking funds work in an app

That’s exactly how Aviary works: whatever you don’t spend in a category stays there and rolls into next month, on top of the amount you assign. A sinking fund just grows month by month until the bill arrives.

So there, a sinking fund works like this. Make a category called Health insurance and assign it ₹1,500. On salary day, move ₹1,500 to your sinking fund savings account and log that transfer against the category. The envelope’s job for the month is done, and the money is building up in the bank where it belongs. When the renewal comes, you pay it from that savings account and don’t log it again. You already counted it, ₹1,500 at a time.

For costs that repeat on a schedule, like an annual subscription, its recurring expenses log on their date and warn you before a renewal, so a yearly charge doesn’t sneak up on you.

When a sinking fund falls short

Prices go up. Your health insurance premium might jump when you cross an age band, and a phone that cost ₹36,000 three years ago might cost more now.

When the bill is bigger than the fund, pay the difference from that month’s budget by moving money from another envelope, the same way you’d handle any overspend. Then raise the monthly amount for next year. If the renewal came in at ₹21,600 instead of ₹18,000, next year’s sinking fund is ₹1,800 a month.

And if a fund ends up with extra? Say the family trip cost ₹26,000 instead of ₹30,000. The ₹4,000 left over can stay for next year’s trip, or go to a different goal. Just make the choice on purpose.

Sinking funds make your budget honest

Here’s the quiet benefit. Without sinking funds, your normal months look better than they are. You think you can afford ₹6,000 on eating out, because most months you can. Then the expensive month arrives and wipes out three months of savings.

With sinking funds, every month carries its fair share of the year. Your budget shows what you can really spend. It’s the same idea behind zero-based budgeting: every rupee gets a job, including the rupees for next April.

Getting started this month

1. List your yearly costs. Go through last year’s statements. Anything over a few thousand rupees that isn’t monthly goes on the list.
2. Write the amount and the due month next to each one.
3. Divide by the months left. If something is due in twelve months, divide by twelve. If it’s due in four, divide by four.
4. Start with the nearest one. Add the others over the next couple of months so your budget doesn’t jump all at once.
5. Open a separate savings account and move the money there on salary day.
6. Review after each bill. Adjust the monthly amount if prices went up.

Give it a year. The first time an insurance renewal or school fee comes and goes without touching your savings, you won’t want to budget any other way.