Changing your tax rate
mid-year.

Tax rates change occasionally — governments adjust VAT, you cross a turnover threshold that bumps your rate, a specific product category gets reclassified. The right way to handle it in nouz is to update the default (or the specific product) going forward, and let the snapshot pattern protect your historical numbers.

01 Changing the default

Open Settings → Business profile. The default tax rate is a field on the card. Edit it and click Save. The new rate is now the suggested value when you create a new product or a manual revenue entry — but it doesn't touch anything you've already logged.

Worth noting: the default is just the suggested pre-fill, not the actual rate used. Each product has its own rate (which may already differ from the default). Each manual entry takes a snapshot at the moment it's saved. Changing the default only changes what future entries pre-fill with.

02 Changing a product's rate

If a specific product's tax rate changes (reduced rate increases, government policy change), open the product and edit its Tax rate field. From that moment, every new sale of that product uses the new rate. Past sales keep the old rate via the snapshot on each revenue entry.

Same pattern works for any per-product rate adjustment: the change is forward-looking, history is preserved.

03 Past entries don't change

This is the same no-retroactive rule that applies to product edits. Every revenue entry stores a snapshot of its tax rate at the moment it was logged. Editing the default or the product changes future entries — never past ones. Your March P&L stays exactly as it was.

04 When you need to fix the past

The real cases for this: you logged a product at the wrong tax rate for an extended period (the snapshot was always wrong), or a retroactive tax-rate change has been mandated by your tax authority and your accountant has confirmed it should backdate. Both rare. For typical mid-year rate changes, the snapshot pattern handles it cleanly without any past-data editing.