Keep organization separate from accounting
Earnt can help organize cases, hours, payments, documents and deadlines. That is different from issuing invoices, calculating taxes or filing declarations.
Record the value and currency of the work
When work has an agreed value, keep it in the corresponding case. If you work in EUR and other currencies, keep each case in its original currency and reconcile the actual payments you received.
Document the service history
Dates, hours, notes, documents and deadlines linked to the same case make later review easier. The goal is to reduce information scattered across apps.
Make local backups
An Earnt backup is a file exported by the user. Keep it somewhere you control and understand that deleting the app, deleting local data and deleting an exported file are separate actions.