Advance tax single-instalment rule extended to assessees declaring presumptive income under section 44ADA, payable by year-end. The amendment modifies clause (b) of sub section (1) of section 211 to substitute the earlier reference to eligible assessees under section 44AD with a reference to assessees who declare profits and gains in accordance with sub section (1) of section 44AD or sub section (1) of section 44ADA, thereby making those assessees liable to pay advance tax in a single instalment on or before the fifteenth of March every financial year.