Living with flatmates is the best deal in a big Indian city. You get a bigger flat, a cook you couldn’t afford alone and someone to share the Wi-Fi password with. You also get a new way to fight: money.
It’s rarely about big amounts. It’s the ₹900 gas cylinder nobody remembers paying for, the flatmate whose AC runs all night on a shared electricity bill, or the one who’s been “settling up next week” since August. Small things that pile up until someone moves out.
Here’s how to split expenses with flatmates so the money stays boring, plus how your share fits into your own budget.
Agree on the rules before the first bill
Most flatmate money fights aren’t about money. They’re about expectations nobody said out loud. Sit down in the first week, before anything has gone wrong, and agree on a few things:
- How rent is split. Equally, or by room?
- Which costs are shared. Electricity, Wi-Fi, maid, cook, groceries, gas, water?
- Who pays what, and when. One person, or whoever’s around?
- How you settle up. A shared kitty, or settling at the end of the month?
- What happens when someone moves out. Notice period, deposit, finding a replacement.
Write it down in your flat WhatsApp group and pin it. It feels formal. It saves you a much more awkward conversation in month four.
Splitting rent fairly
Equal rent is simplest, but it’s only fair if the rooms are equal. They rarely are. One room has an attached bathroom and a balcony. Another is the small one next to the kitchen.
A common fix is to split by room. Here’s a 3BHK in Bengaluru with a total rent of ₹54,000:
| Room | Monthly rent |
|---|---|
| Master bedroom with attached bath and balcony | ₹21,000 |
| Second bedroom with attached bath | ₹18,000 |
| Third bedroom, shared bath | ₹15,000 |
| Total | ₹54,000 |
Agree on the split before anyone picks a room. Once someone’s unpacked in the big one, “let’s make it fair” gets a lot harder.
The security deposit should follow the same ratio. If the deposit is ₹1,62,000, three months of rent, then each person puts in three months of their own share: ₹63,000, ₹54,000 and ₹45,000. That adds up to ₹1,62,000. Write down who paid what, because it’s easy to forget by the time anyone moves out.
Not sure how much rent you can take on in the first place? The rent affordability calculator gives you a sensible range for your salary.
The shared monthly costs
Rent is one payment. The shared costs are where it gets messy, because there are lots of them and they come at different times. For the same three flatmates:
| Shared cost | Monthly | Each (split three ways) |
|---|---|---|
| Electricity | ₹3,600 | ₹1,200 |
| Wi-Fi | ₹900 | ₹300 |
| Maid (cleaning and dishes) | ₹4,500 | ₹1,500 |
| Cook (two meals a day) | ₹7,500 | ₹2,500 |
| Groceries and kitchen staples | ₹9,000 | ₹3,000 |
| Cooking gas | ₹900 | ₹300 |
| Drinking water cans | ₹600 | ₹200 |
| Total | ₹27,000 | ₹9,000 |
So each person pays their room rent plus ₹9,000 a month for the shared stuff. That’s one predictable number you can plan around.
A few costs need special rules:
Electricity with one AC. If only one person has an AC, an equal split isn’t fair. Agree on a simple fix, like the AC owner paying an extra ₹500 to ₹1,000 in summer months. It doesn’t need to be exact. It needs to feel fair to everyone.
Personal groceries. The shared kitty covers rice, dal, oil, vegetables and milk. Your protein powder, fancy coffee and midnight Maggi stock are yours. Draw the line early.
Guests. A partner who stays four nights a week eats the cook’s food and uses the AC. It’s worth a polite chat and a small extra contribution.
The Diwali bonus for the maid and cook. Split it three ways like any other shared cost, and put it in your Diwali budget so it doesn’t surprise you.
Shared kitty vs settle-up
There are two ways to actually move the money around. Both work. Pick one and stick with it.
The shared kitty
On the 1st, everyone sends their ₹9,000 to one person, or to a separate account the flat uses. That person pays the maid, the cook, the grocery runs and the bills from the kitty. At the end of the month, they post what’s left in the group.
Good for: flats with regular, predictable costs. Nobody chases anyone, because everyone paid upfront.
Watch out for: the kitty holder doing a lot of unpaid admin. Rotate the job every few months. And don’t let them mix it with their own money, or the numbers get blurry fast.
Settle-up
Whoever pays for something logs it in a shared sheet or a bill-splitting app. At the end of the month, you add it up and pay each other the differences.
Good for: flats where costs vary a lot, or people who travel often and don’t want to pay for a month they weren’t there.
Watch out for: balances that never get settled. Pick a date, like the 5th, and settle every month no matter how small the amount. Skip ₹2,000 a month and it’s ₹12,000 and a cold war by month six.
How your share fits your own budget
Here’s the part flatmate guides usually skip. Splitting fairly with your flatmates is only half of it. You still need your share to fit inside your own salary.
Treat the flat like any other part of envelope budgeting. Your rent is one envelope. Your share of the shared costs is another. Here’s how it looks for the person in the second bedroom, on a ₹65,000 take-home salary:
| Envelope | Amount |
|---|---|
| Rent (your room) | ₹18,000 |
| Flat share (kitty) | ₹9,000 |
| Your own groceries and snacks | ₹2,000 |
| Metro and autos | ₹3,500 |
| Eating out and delivery | ₹5,000 |
| Phone | ₹500 |
| Shopping | ₹4,000 |
| Fun and subscriptions | ₹3,000 |
| Flat one-offs | ₹2,000 |
| Emergency fund | ₹8,000 |
| SIP | ₹10,000 |
| Total | ₹65,000 |
That Flat one-offs envelope matters. Mixers break. Someone wants a new water purifier. The house party needs snacks. The landlord won’t fix the geyser. These costs come up every few months, and a small monthly envelope turns them into a non-event. It’s the same idea as sinking funds, just for the flat.
When you pay for everyone
The trickiest moment for your budget is when you pay the full bill. You do the big grocery run and pay ₹4,500 by UPI. Only ₹1,500 of that is your spend. The other ₹3,000 is money your flatmates owe you.
If you log the whole ₹4,500 against your groceries envelope, your budget says you’ve overspent when you haven’t. Log only your share as spending, and track the rest as owed until it comes back.
Aviary helps here with bill scanning. Snap the grocery bill, and it reads each line into a category. You can split the shared items, so only your share lands in your envelopes, and your personal protein bar goes in full. It also never links your bank or reads your SMS, so your flatmates’ transfers to you don’t get mixed up with your spending.
Getting started with your flatmates
- Have the money talk this week. Rent split, shared costs, kitty or settle-up, move-out rules.
- Split rent by room if the rooms aren’t equal, and do the deposit the same way.
- List every shared cost and work out the monthly share per person.
- Pick one system, kitty or settle-up, and a fixed date to settle every month.
- Write it all in the group and pin the message.
- Add two envelopes to your own budget: one for your rent and one for your flat share, plus a small one for flat one-offs.
Good flatmates aren’t the ones who never spend money on the flat. They’re the ones who make it easy to know who owes what. Get the system right in month one, and money becomes the least interesting thing about living together.