How does taxation work in the sole trader (toiminimi) service?

When your customer pays an invoice, any costs are deducted from it. From the remaining amount, we withhold the portion corresponding to your tax percentage and remit it to the Finnish Tax Administration. You can check and update your tax percentage directly in the Truster app under Menu > Tax percentage. If the Finnish Tax Administration has assigned you advance taxes, you handle those yourself and set the app's tax percentage to 0 %.