A VAT rate is changing and I am unsure how to apply it safely on the POS.

A rate change sounds like a checkbox, but in practice it touches items, shelf labels, open orders and the accounting link. Switch exactly at midnight on the effective date, not earlier and not later, and keep a snapshot of the old prices for your records.

Try this first

1. 1List every product group on the old rate, keep an export as a snapshot.
2. 2Plan the switch on the exact effective date, after the last end-of-day.
3. 3Do not just change the rate field, also verify that gross or net prices remain correct.
4. 4Run a test receipt for at least one item per group, confirm the right rate prints.
5. 5Align with your accountant so the link to Exact, Twinfield or Moneybird splits old and new bookings cleanly.

None of the above fits?

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