Effective March 30, 2020 all taxpayers who file a return less than $1,000,000 will have an additional 3 months to file their return, between now and July 31, 2020. To calculate interest for returns during this period, use a start date of August 1, 2020. For more information, see our COVID-19 page.
Taxpayers reporting $1,000,000 or more should not use the interest calculator to calculate interest for the months of March 2020 through June 2020. Monthly interest for these months can be calculated by multiplying the Tax or Fee Amount by the monthly interest factor (.00667). Example: $1,000,000*.00667 = $6,670 of interest due.