Groups — one balance instead of ten transfers

A one-off split works like this: photo, link, everyone claims their own, done. That’s the right shape for dinner with people you’ll next see in six months.

It’s the wrong shape for flatmates. There, the same people settle up every week for years — and splitting each bill separately means a dozen micro-transfers a month going in both directions. Groups are for that.

What a group is

A fixed set of people you add receipts to as you go. A flat, a travel crowd, a family.

Rather than settling each bill and forgetting about it, the group maintains a running balance: who owes whom in total, accounting for everything anyone has added.

Why this changes settling up

Because debts offset each other.

Say that this week I bought 200 zł of groceries, you paid a 90 zł internet bill, and Kasia spent 60 zł on household stuff. Settled bill by bill, that’s six transfers in various directions. As a group, it’s one balance — from which it follows that a single transfer squares everything.

The longer a group runs, the bigger the difference. After a month of living together, “let’s settle each receipt” versus “let’s settle the balance” is typically twenty transfers against two.

When a group is worth it

• A shared flat — rent, utilities, shopping. The classic case.
• A trip — dozens of expenses in a week, paid by different people. Groups also store an exchange rate, so everything converts consistently at a single rate.
• Family — joint shopping, presents, bills.
• A regular crowd that goes out together often.

If you settle up with someone less than once a month, a group is overkill — an ordinary split is enough.

Getting started

Groups are in the menu once you’re signed in. Create one, send an invitation, and from then on every receipt added to the group moves the balance. Members see everything as it lands, so there’s never a moment where someone learns about an expense after the fact.

When it’s time to square up, you record the repayment and the balance clears.

What comes next

Calculating the balance is only half the problem, though. Settlements between friends rarely break down because someone did the sums wrong — they break down because nobody wants to do the chasing, and then because paying back is a hassle. We’ll cover both separately over the next couple of weeks.

In the meantime, if you share a flat, the guide to splitting costs with flatmates covers rent with unequal rooms, utilities, and what’s worth agreeing before you move in.