To duplicate an expense:

1. Open the paid expense you want to copy. Duplicate is only available on paid expenses; an unpaid expense shows "Mark as Paid" instead
2. Click "Duplicate" in the header, or use it from the "Actions" card in the sidebar
3. A new unpaid copy is created with the same details, dated today. The copy keeps the same supplier, category, VAT treatment, project, customer, property and investment status. If the original is an investment, the duplicate is also created as an investment with the same useful life and residual value
4. Adjust the amount or other details as needed

Tip: Useful for regular expenses that occur with slight variations each time.