Debit Note

A debit note is the opposite of a credit note. While a credit note reduces the amount a client owes, a debit note increases it. You issue a debit note when you discover you undercharged on the original invoice, when additional taxable services were provided, or when the tax rate on the original invoice was lower than applicable.

Under GST, debit notes must be reported in your GSTR-1 return. They increase your output tax liability for the period in which they're issued. The debit note must reference the original invoice number and date, and clearly state the reason for the additional charge.

Common scenarios for issuing debit notes: you quoted a price in USD but the INR conversion at the time of supply was higher than estimated, additional hours were worked beyond the original scope, or the GST rate was revised upward between quoting and invoicing.

Required fields on a GST debit note: the words "Debit Note," your GSTIN, a unique debit note number, reference to the original invoice, description of the additional charge, revised tax calculation, and total additional amount payable.

In practice, many freelancers issue a supplementary invoice instead of a formal debit note. Both achieve the same result, but if the original invoice has already been reported in your GST returns, a debit note is the technically correct approach. It keeps your invoice sequence clean and your GST filings accurate.