Credit and debit notes enable adjustment of tax liability where invoices err or goods returned, subject to statutory conditions.

If a tax invoice overstates tax or taxable value, goods are returned, or supplies are deficient, the supplier may issue a credit note with prescribed particulars and must declare it in the return for the month of issuance but not later than the September following the financial year end or the relevant annual return filing date, whichever is earlier; tax liability is adjusted as prescribed and no reduction is allowed if tax and interest were passed to another person. If a tax invoice understates tax or taxable value, the supplier must issue a debit note (including a supplementary invoice), declare it in the return for the month of issuance, and adjust tax liability as prescribed.

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