1. Separate shared and personal costs from day one
Rent, electricity, water, gas, internet and cleaning supplies are usually shared. Personal food, things for your own room and subscriptions only one person uses are not. Writing this list together when you move in prevents most future arguments.
2. Agree on how to split
- Equally: the simplest method. Works well for groceries and bills in most homes.
- Proportionally: if rooms differ in size, rent can follow room size; if incomes are very different, some costs can follow income.
- By usage: if someone spends far more time at home (for example, works from home), a different share for items like electricity can be agreed.
Which method you choose matters less than everyone agreeing to the same rule up front.
3. Record spending immediately
Expenses you’ll “add later” get forgotten. Logging a grocery receipt as you leave the till, or snapping a photo of it, removes the end-of-month “who bought this?” question.
4. Keep everything in one place
Notes lost in a group chat, everyone keeping their own tally… Keep it all in one spreadsheet or app so everyone sees the same record of who paid what and who owes how much.
5. Settle up with the fewest transfers
Nobody needs to pay everyone back one by one. First find each person’s net balance: what they paid minus their share. Then debtors pay creditors. For example:
| Person | Paid | Share (900 ÷ 3) | Net |
|---|---|---|---|
| Ayşe | 600 (groceries) | 300 | +300 |
| Mert | 300 (bills) | 300 | 0 |
| Can | 0 | 300 | −300 |
The result is a single transfer: Can pays Ayşe 300. Mert owes nobody. In bigger households this turns dozens of small payments into a handful of transfers.
6. Pick a regular settle-up day
Closing the books once a month (for example on rent day) stops debts from piling up. Small amounts are much easier to talk about than big ones.
7. Use separate groups for trips and guests
If the costs of a holiday together get mixed with household spending, the numbers quickly become impossible to follow. Opening a separate group for a trip, a birthday or a big dinner and closing it afterwards is the cleanest way.
How Kirvem makes this easier
We built Kirvem for exactly these problems: split expenses equally or proportionally, attach a receipt photo, and the app works out who owes whom with the fewest transfers. Roommates join with an invite code; nobody needs an account and the app works without internet. You can be in one home and as many trip groups as you like at the same time. Kirvem doesn’t move money; you pay each other directly and mark it as “paid”.
