Change in rate of tax: time of supply governed by sequencing of invoice issuance and receipt of payment. Change in the rate of tax sets specific time of supply rules based on sequencing of invoice issuance and receipt of payment. For supplies made before the rate change, the earlier of invoice or payment governs when both occur after the change; invoice date governs if issued before and payment after; payment date governs if received before and invoice after. For supplies made after the rate change, analogous sequencing rules assign either payment date or invoice date as the time of supply. Payment is treated as received on bank credit when such credit occurs more than four working days after the rate change. 'Date of receipt of payment' means the earlier of book entry or bank credit.