Advance tax notice requires specified instalments, permits reduced estimates via Form 28A, and may trigger interest. Notice requires payment of advance tax in prescribed instalments, directs payment through authorised banks using enclosed challans, and identifies the payable amount in the enclosed order. An assessee may file a revised estimate before the first instalment using Form 28A and adjust instalments accordingly, or pay additional amounts if the current estimate exceeds the demand. Failure to pay or underpayment attracts interest under statutory provisions. The enclosure sets out the assessing officer's computation fields for income subject to advance tax, exemptions, deductions, tax already paid and the net amount payable.