Tax Deducted at Source obligations under GST require submission of a prescribed return with invoice-level TDS details. Form GSTR-7 requires the deductor's GSTIN and name, invoice level reporting of amounts paid to deductees and tax deducted apportioned by Integrated, Central and State/UT tax, declaration of tax deducted and paid, and fields for interest and late fee. It provides an amendment mechanism to revise prior-period TDS entries with original and revised details, reconciles payments via electronic cash ledger debit entries and permits refund claims from that ledger. Filing is conditional on full payment and concludes with a verified declaration by an authorised signatory.