Fair contribution guide
There is no universal list assigning each bill to one partner. A fair system starts by separating household costs from personal choices, choosing one default contribution rule, and agreeing how to handle the few categories that need an exception.
Put each cost into one of four buckets before discussing the split.
Use 50/50 when incomes and financial pressure are similar. Use a fixed or income-based percentage when equal payments would create unequal sacrifice. The rule should be visible, easy to explain, and applied consistently.
Dates, family events, cars, health costs, and housing upgrades create friction when expectations are implicit. Agree whether each category is shared, personal, or shared only above a consent threshold.
The person whose card was used did not necessarily spend more for themselves. Track the household cost, the payer, and the agreed shares as separate facts before calculating the balance.
Revisit the system after moving, a salary change, parental leave, unemployment, new debt, children, or a major shared purchase. Fairness can change even when the formula has not.
Your shared life, clearly
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