Tool
The single-tax calculator
What does living alone cost you, compared with sharing the same life with one other person? Enter your monthly costs in any currency.
Enter your costs to see your single tax.
How the calculation works
Fixed costs (rent, energy, internet, insurance and subscriptions) are split in half when two people share a home. Food and household shopping grow with each person, but not in full: the calculator uses the modified scale of the Organisation for Economic Co-operation and Development, which treats a second adult as adding half of what the first adult needs, so each of two adults spends three quarters of what one person alone spends on these items.
The calculation runs on your phone or computer. The figures you type are not saved.