Your Girlfriend Wants to Move In — Should You Charge Her Half the Mortgage?

A 50/50 mortgage split may look fair, but homeowners build equity through principal payments while a non-owner partner may not. Separating rent, shared expenses, and ownership can prevent costly misunderstandings – Shutterstock

Your girlfriend moving into your house can turn one romantic decision into a surprisingly complicated money conversation. Splitting the mortgage 50/50 sounds tidy, especially if two adults share one home and two incomes help cover the bills. But a mortgage payment does not represent just one household expense.

Part of it may pay interest, while another part reduces the loan balance and builds your equity. Property taxes, homeowners insurance, utilities, repairs, and maintenance create a separate set of costs. Once those pieces enter the conversation, “half the mortgage” starts looking less like simple fairness and more like a question worth doing some homework on.