Section 266 - Self-assessment.

Self-assessment tax payment requires advance discharge of tax, interest and fee before filing the return, with credit adjustments and default consequences.

Self-assessment requires payment, before furnishing the return, of any tax payable on the return together with applicable interest and fee, after crediting tax already paid, tax deducted or collected at source, specified foreign tax reliefs, eligible tax credits, and any tax or interest payable under the Act. The return must be accompanied by proof of payment. Any shortfall is adjusted first against fee, then interest, and lastly tax. Unpaid amounts render the assessee an assessee in default.