Moving in with a new partner brings together different incomes, children’s needs and existing commitments. A useful budget makes those commitments visible and explains which costs you are choosing to share. It does not need to make every contribution identical.
Before dividing the new household’s bills, list income and existing commitments. These may include maintenance, debt payments, childcare and agreed expenses for a child living elsewhere.
A new household does not automatically end an existing support obligation. Benefits and tax arrangements may also change when a partner moves in. Check those rules separately from the budget you choose together.
There is no need to put every child’s expense into the same group. What matters is knowing where it belongs before the bill arrives.
An equal split can be straightforward if incomes and other commitments are similar. A proportional split may be more manageable when they differ. Either is a voluntary budgeting choice, not a legal formula for maintenance or property rights.
For example, if the amounts you agree are available for shared bills are 3,000 and 2,000 a month, a 60–40 split of a 1,500 shared budget would be 900 and 600. Decide together what “available” means before using the percentages.
Leave room for essentials, existing obligations and some personal spending. A budget that only works by repeatedly using debt needs revisiting.
An older child may need a bus pass while a younger child needs childcare. A child may have disability-related costs or receive different support from another household. Explain differences in terms of needs, without ranking children’s worth.
Agree manageable rules for things such as pocket money, birthday spending and optional activities. Avoid telling a child that another parent’s missed payment makes them less entitled to belong in the home.
Decide which optional purchases need agreement, who pays first and how reimbursement works. If one adult offers to pay for an activity, make clear whether this is a gift, a one-off contribution or a continuing commitment.
A joint account can be convenient, but check withdrawal access, liabilities and limits. It is not necessary to give a partner access to all your money or banking passwords to run a shared budget.
Based on the original article by Magnus Hjelmér.
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