Time of supply rules fix tax liability based on invoice issuance or receipt of payment, with tailored reverse charge and voucher triggers.

The provision fixes the time of supply for goods by objective events: for normal supplies the earlier of invoice issuance (or its last permissible date) and receipt of payment, with supply deemed only to the extent covered by the invoice or payment and payment defined by accounting entry or bank credit. For reverse-charge supplies the earliest of goods receipt, payment entry or bank debit, or a date following a statutory period after invoice issuance applies, with recipient's accounting entry as a fallback. Vouchers are taxed on issuance if identifiable or on redemption; additions like interest or late fees are taxable when received.

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