No 1 calculates it for u re. Its simple u have to do all this urself. Then, in the end, when u submit ur return, the software with IT Dept does all the workings & comes out with ur actual liability.
And the deadline for the payment is December 15. If u deposit by this date, then the software will not calculate any interest. If u pay after this date, interest will start to accrue on it.
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Well, u got too much frank! 😀