The 3-account model is only half the truth — and why Equna is the other half

When a couple in Germany asks today, "How should we organise our finances?", the answer is the same everywhere: the 3-account model. ING, Sparkasse, DKB, Tomorrow, personal-finance influencers, even public broadcasters — everyone recommends it. And rightly so: it's a robust, fair, everyday-tested model.

But it only solves half of the problem.

In this article, I'll show what the 3-account model actually does, where it has a systematic gap — and why Equna isn't a replacement for the account model but a complement to it.

What the 3-account model does (short and honest)

The model consists of three accounts:

1. Account A — belongs only to you, your income, your spending money, your private life.
2. Account B — belongs only to your partner, same principle, the other way around.
3. Joint account — both partners pay in a monthly contribution; rent, utilities, insurance, groceries and child costs go out from here.

The contribution to the joint account is agreed either 50/50 or proportional to income (earn 60 %, pay in 60 %).

What this model solves brilliantly:

• Financial independence is preserved. Everyone has their own account, nobody has to ask for money.
• Fixed costs are automated. Rent and recurring transfers run from the joint account, nobody has to think about them every month.
• No micromanagement in everyday life. Quick bread run? Just tap the card.

That's exactly why it's recommended so often. It's good.

What the 3-account model does not solve

This is where it gets interesting — and this point is missing from almost every bank guide.

The 3-account model regulates the flow of money. It says: "Which account pays for what?"

It does not regulate tracking. It says nothing about who actually paid for what in real life.

Sounds like splitting hairs? Look at these situations:

Situation 1: Spontaneous shopping from the wrong account

After work, you swing by the supermarket. The card from the joint account is at home. You pay with your private card. €87.40 for the weekly shop.

What happens now? In practice: nothing. Maybe you'll remember in the evening, maybe not. Maybe you'll transfer yourself the amount back, maybe not. Three months later, nobody remembers how much added up in total.

Situation 2: Cash

Your partner pays the cleaner €80 in cash. You pay the plumber €60 in cash. The babysitter €50 in cash. It doesn't show up on any account. In the model, it doesn't exist.

Situation 3: Your child's school trip

€400 should come from the family budget. You fronted it because it was urgent. Three weeks later, nobody remembers exactly whether that was settled or not.

Situation 4: The end-of-month argument

"I paid for the big grocery run again this month." — "But I covered the kids' birthday parties!" Both feel like they've carried more. Nobody can prove it. The joint account shows the debits but not the spontaneous expenses from the private accounts.

Situation 5: Co-parents without a joint account

You're separated, share a child and have no joint account. The 3-account model doesn't work for you at all. You still need to split child costs fairly.

These five situations aren't edge cases. They are everyday life. And the 3-account model has no answer for any of them.

Where Equna comes in

Equna isn't a bank. Equna doesn't move money. Equna doesn't replace your joint account.

Equna does something else: it tracks every expense, categorises it, reconciles cleanly at the end of the month, archives the month — and then gives you a clear number: "A owes B exactly €142.30." Regardless of which account, which card or whether it was paid in cash.

Concretely:

• Every expense gets captured — groceries, school trip, plumber, babysitter. Any account.
• Every expense gets a split — 50/50, 60/40, or different per category (premium).
• Receipts stay attached — photos of till slips, OCR reads amount and date directly.
• Clarifications before closing — if something looks off, it gets sorted before the month closes.
• Month-end with two-sided confirmation — both confirm, the month is archived, a clear settlement amount is on the table.
• Kids as a separate area — separate splits for household and child costs possible.

That's the tracking layer the 3-account model doesn't have — and can't have, because a bank doesn't know what you paid in cash on Saturday.

Three scenarios — how it plays out together

Scenario 1: Couple with 3-account model + Equna

You have your joint account, all fixed costs run through it. You still use Equna for everything that doesn't take the standard route: spontaneous shopping, cash, child expenses, gifts, plumbers, trips. At the end of the month, Equna tells you the difference, and you do a small settlement between the private accounts — or from the joint account to whoever fronted the money.

Upside: you get the elegance of the account model and the truth about your actual spending.

Scenario 2: Co-parents without a joint account

You're separated, there's no account model. Both of you pay for child expenses as they come up. Here Equna isn't a complement, it's the entire tool: every expense gets assigned, at the end of the month there's a clean settlement, both confirm, done. No WhatsApp accounting, no spreadsheet, no "wait, did we already settle that?".

Scenario 3: Couples just moving in together

You're not ready yet to open joint accounts. Maybe you want to see first how it all settles. Here Equna is a practice space: every expense is captured cleanly, after three months you'll realistically see what your joint costs are, who pays how much — and then you can decide whether to switch to the 3-account model and with what contribution per person.

When do you need both — and when is Equna alone enough?

Your situation	3-account model useful?	Equna useful?
Married / long-term together, shared household	Yes, almost always	Yes, for everything that bypasses the joint account
Just moved in, still feeling it out	Optional, later	Yes, as a practice space
Co-parents after separation	Doesn't apply (no joint account)	Yes, as the complete tool
Blended family with kids from multiple relationships	Complex, often several accounts	Yes, for clear assignment per child
Flatshare of 5 people with constant turnover	No	No — use Splitwise or Tricount

That last row matters to me: Equna isn't built for every constellation. For travel and big flatshares there are better tools. Equna is built for the two-person constellation — couple, family, co-parents.

Why bank guides don't tell you this

A small aside: you won't find this point — "the 3-account model tracks nothing" — in any bank guide. That's not a conspiracy. It's just that a bank sells an account product. It talks about accounts. Tracking isn't its world.

By the same token, no serious tracking app would talk about account models if it were trying to position itself as a "bank replacement". Equna doesn't want to replace a bank. Equna wants to give you the tool that's missing in the gap.

In closing

The 3-account model is a good concept. If you don't have one yet and you're living together long-term: do it. Open a joint account, define the contribution, automate the fixed costs.

But then ask yourselves one more question: Who actually tracks who paid for what in real life? Who records that you covered the weekly shop from your private account because the joint card was at home? Who documents the €400 for the school trip you fronted?

If the honest answer is "Nobody — we just trust each other", that's lovely. It works for many years. But if you ever get the feeling that one of you carries more than the other, you'll have no data at all to check it or settle it. And that's exactly the friction point where relationships unnecessarily start to tip.

Equna is the small, quiet layer between the accounts and the gut feeling. No more, no less.

If you have questions or want to share your own experience with the 3-account model: contact@equna.eu. I reply personally.

— Patrizio