Interest at the rate of 1.5% per month or part
thereof, for the period from the date on which
TDS is actually deducted/collected to the date
on which such TDS/TCS is actually paid.
Calendar month is considered in calculating
interest therefore if you delay payment by one
day, you have to pay interest for two months.
For eg you pay TDS deducted for month of
July on 8th of Aug then you have to pay
interest for month of july and august i.e total
3%.