The country that your company code operates in has defined a new VAT tax rate...

Enter the new tax codes as default for users who have authorization to post general ledger transactions after balance carry forward is done

Enter the appropriate new VAT code in the tax category field of the relevant expense and revenue G/L accounts after balance carry forward is done

Create a substitution that changes the deprecated VAT code when relevant new one when entering documents with posting data in the new year

Create a validation that issues an error when the user uses a deprecated VAT code when entering documents with posting data in the new year