Rounding off rules: ignore paise then round to nearest ten rupees, making the rounded figure legally operative.
The provision applies rounding to computed total income and to amounts payable or refundable by first ignoring paise and then rounding the rupee amount to the nearest multiple of ten rupees-rounding up where the units digit is five or more and rounding down where it is less than five-and declares the rounded amount to be the deemed operative total income or amount payable or refundable for all purposes under the Act.

Rounding of tax amounts: unified rule mandates nearest multiple rounding for total income, payable and refundable amounts.
Clause 516 prescribes a mandatory two-step rounding mechanism: ignore any paise, then round the rupee amount to the nearest multiple of ten-rounding up if the last digit is five or more and down if less than five-and deems the rounded figure to be the amount of total income, amount payable, or amount refundable for all purposes under the Act.