section 234b

234B. [1] Subject to the other provisions of this section, where, in any financial year, an assessee who is liable to pay advance taxunder section 208 has failed to pay such taxor, where the advance tax paid by such assessee under the provisions of section 210 is less than ninety per cent of the assessed tax, the assessee shall be liable to pay simple interest at the rate of one per cent for every month or part of a month comprised in the period from the 1st day of April next following such financial year to the date of determination of total incomeunder sub-section [1] of section 143 and where a regular assessment is made, to the date of such regular assessment, on an amount equal to the assessed tax or, as the case may be, on the amount by which the advance tax paid as aforesaid falls short of the assessed tax.

Yes, applicable to all assessees, including NRI.