Household money architecture (Kontenmodell für Paare)
Household money architecture is the combined system a household uses to route income into shared and personal accounts, then apply a Floor/Future/Free split across that structure. It settles two questions together: whose income funds which account, and how much of the household's money sits in joint accounts versus stays individual — before any spending decision happens.
Why it matters
A single-earner or single-person household can apply the three-account structure directly: one income, one Floor, one Future, one Free. A multi-income household — most commonly a couple — has to decide first how incomes combine, because that choice changes what "Floor," "Future," and "Free" mean for each partner. Skipping this step is a common source of friction: money moves get experienced as unilateral or unfair even when the underlying budget math works.
The architecture question sits above Steuerklasse (tax class) choice, joint tax filing, or Zugewinngemeinschaft (Germany's default marital property regime): those determine what each partner nets from income, not how the household routes money once it arrives.
The method
- Choose an income model. Pooled (all income into one joint account), proportional (each partner contributes a share of income toward shared costs and keeps the rest), or hybrid (a joint account for shared Floor and Future costs, personal accounts for individual Free spending).
- Map Floor and Future onto joint or personal accounts. Under pooled and hybrid models, Floor (fixed costs) and Future (savings) typically sit in the joint account; under proportional, each partner may instead keep their Future contribution in a personal Tagesgeldkonto (instant-access savings account).
- Choose the joint account type. A Gemeinschaftskonto (joint account) is either an Oder-Konto — either partner can transact alone — or an Und-Konto — both signatures are required per transaction. Oder-Konto is more common for day-to-day use; Und-Konto trades convenience for a mutual check.
- Size contributions under the chosen model. Pooled needs no split calculation. Proportional needs each partner's share of combined income applied to the shared Floor-plus-Future total. Hybrid needs an agreed joint contribution (equal or proportional) plus a separate personal Free allowance per partner.
- Automate the transfers on payday, the same mechanic the three-account structure uses at the individual level.
- Re-run the model when income changes — a raise, a job loss, parental leave — since a contribution split calculated on old income numbers stops being proportional.
Worked example
Two partners net €4,200 and €1,800 per month (combined €6,000) and use the proportional model. Shared Floor and Future total €1,500: €1,000 rent, €150 Nebenkosten (utility costs), €150 Versicherungen (insurance), €200 savings.
| Partner A | Partner B | |
|---|---|---|
| Net income | €4,200 | €1,800 |
| Share of combined income | 70% | 30% |
| Contribution to joint account | €1,050 | €450 |
| Remaining as personal Free | €3,150 | €1,350 |
| Contribution as % of own income | 25% | 25% |
Both partners put the same 25% of their own income toward shared costs — that is what "proportional" equalizes. Because Partner A earns 70% of the combined income, A funds 70% of the €1,500 joint account (€1,050) and B funds 30% (€450): the euro amounts differ, the contribution rate does not. A pooled model would instead merge both incomes and size Floor, Future, and Free once for the household as a unit; a hybrid model would add a fixed personal Free allowance for each partner on top of a smaller joint contribution.
Check yourself
Two partners net €5,000 and €2,000 per month (combined €7,000) and use the proportional income model. Shared Floor and Future costs total €2,100 per month. How many euros does the partner earning €2,000 contribute to the joint account?
Which of the three income models (pooled, proportional, hybrid) requires no contribution-split calculation at all?
A couple opens a Gemeinschaftskonto (joint account) where either partner can withdraw or transfer money alone, without the other's approval on each transaction. What type of account is this?
Which of the following are true about household money architecture? Select all that apply.