Share costs by income
Sharing costs by income means each partner contributes in proportion to their income. If one earns 60% of the total, they pay 60% of the joint costs. Enter your net incomes and joint monthly costs; everything is calculated in your browser.
Example calculation. There are other ways too, such as in proportion to what each keeps after their own fixed costs.
By income or 50/50?
With 50/50 each pays half, regardless of income. That is simple, but the partner who earns less keeps much less. Sharing by income means each spends the same percentage of their income on joint costs. Which split fits is a choice you make together.
Frequently asked questions
How do you calculate by income?
Divide each income by the total income. That percentage is your share of the joint costs. With €3,200 and €2,400 net that is 57% and 43%.
Gross or net income?
Usually net income, because that is what you really have to spend. Include holiday pay and a thirteenth month if you spread them over the year.
What counts as joint costs?
Often rent or mortgage, energy, internet, groceries, insurance and costs for children. Each pays their personal spending themselves.
How do you keep track?
In Scotis you choose by income or 50/50 under Share costs. Each month you see who paid what and who still needs to top up.
Track it every month
In Scotis you track together who paid what, by income or 50/50, and see who still needs to top up.
Updated on 7 November 2026.