An assessment notice from the Inland Revenue Department is not a demand to pay, but an invitation to show cause on the adjustment proposed in it. The notice states the income the department has identified, the tax computed and the reasons, and the taxpayer has a strict window to respond before the figure becomes final. The response is preparation, not argument. Assemble the records behind the figures in the notice: the returns filed, the bank statements, the supplier documents and the certificates of tax withheld, and answer point by point within the prescribed period. A reasoned reply with evidence attached carries weight; a bare denial rarely does, and silence converts the proposal into an assessment automatically. Where the outcome stays adverse, the appeal ladder continues to departmental review and then the tribunal, each stage with its time limits and deposit conditions. The working rule for taxpayers is to treat the notice's date as the start of a countdown: prepare the reply, meet the deadline and keep the evidence. Most adjustments dissolve under documentation authority. Karkakura supports its readers with checklists matched to the stage their case has reached.