Per IRS Instructions for Forms 1099-INT and 1099-OID, page 3:

Box 8. Tax-Exempt Interest

Enter tax-exempt interest that is not OID of $10 or more that is credited or paid to the person's account if that interest is paid on obligations issued by a state, the District of Columbia, a U.S. possession, an Indian tribal government, or their political subdivisions, or qualified volunteer fire departments to finance eligible expenditures. A political subdivision may include port authorities, toll road commissions, utility services authorities, community redevelopment agencies, and similar governmental entities that meet the requirements of Regulations section 1.103-1(b). Include in box 8 any accrued qualified stated interest on these bonds sold between interest dates (or on a payment date).

Report your Form 1099-INT in the TaxAct program, and enter your Box 8 tax-exempt interest amount (if you need help accessing Form 1099-INT, go to our Form 1099-INT - Entering in Program FAQ):

1. From within your Form 1099-INT, continue with the interview process until you reach the screen titled Investment Income - Tax-Exempt Interest.
2. Click the data entry field below 8. Tax-exempt interest, and type your amount.

Note that any link in the information above is updated each year automatically and will take you to the most recent version of the webpage or document at the time it is accessed.