Self-assessment payment requirement: tax, interest and fees must be paid with proof before filing the income tax return.

Clause 266 requires that where tax remains payable after accounting for specified offsets, the assessee must pay the tax together with applicable interest and fee before filing the return and must attach proof of payment; it specifies the offsets to be taken into account, the order of adjustment for short payments (fee, then interest, then tax), rules for computing interest on declared income and on assessed tax or advance tax shortfall, a definition of assessed tax for these computations, and that such payments are deemed to apply to later regular assessments while nonpayment renders the assessee in default.

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