When a relationship turns into living together, a choice arrives that many couples make almost by accident: do we combine our accounts or keep them separate? There's no single right answer, but knowing the three main models helps you choose deliberately instead of by inertia.

1. A single joint account

All income goes into one account, and everything comes out of it. Pros: maximum transparency, simplicity, a team feeling. Cons: zero independence on personal spending, and if incomes are very different an unspoken "I earn more, so my opinion counts more" can creep in.

2. Fully separate accounts

Each keeps their own, and you split shared expenses case by case. Pros: full independence. Cons: it turns into roommate accounting, with constant "I paid for this, you paid for that", and you often fall back on 50/50 which — if you earn different amounts — isn't fair.

3. The hybrid model (the most popular)

Each keeps their own account and contributes to a shared pot for joint expenses. It's the best compromise between team and independence: household expenses are handled together, but each person stays free with their own. The key question becomes: how much does each person put into the shared pot?

The key isn't the account, it's the share

Whichever model you choose, the delicate part is how you split the shared expenses. If incomes are similar, fifty-fifty is fine. If they're different, the fair split is the one proportional to income: whoever earns 60% of the total contributes 60% of shared expenses. That way the effort is the same for both. (We covered this in detail in the guide on how to split couple expenses.)

How to choose

  • Want simplicity and trust each other completely? A single account can work.
  • Value your independence? Go hybrid, with an agreed share for shared expenses.
  • Very different incomes? Any model, but with a proportional split on shared costs.

The good news is you don't need to switch banks to run the hybrid model: you just agree on the shares and keep track of who contributes to what. That's exactly what TogetherExpenses does: it separates shared and personal expenses and works out each person's fair share, without you having to open or close any accounts.