Input tax credit: entitlement requires tax invoice, receipt, tax payment and timely return filing; exceptions for depreciation and delayed claims. Registered persons may claim input tax credit for business supplies only where they hold a tax invoice or prescribed document from a registered supplier, have received the goods or services (including deemed receipt), the tax has been actually paid to Government in cash or by use of admissible credit, and the return under the Act has been furnished; credits on goods received in lots attach on receipt of the last instalment, credits are disallowed where the tax component on capital goods was depreciated under income tax law, and claims are time barred after the September return following the financial year or the annual return, whichever is earlier.