Tax Filing Deadline for Unincorporated Business Owners

Midnight June 15 is the tax filing deadline for unincorporated business owners and their spouses, and the official end of tax season. Failing to file and pay the taxes due by June 15 results late filing penalties and interest. File by midnight June 15 and avoid the 5% late filing penalty plus 1% per month on the outstanding balance for up to 12 months. If you are delinquent on paying for the second time within three years, that penalty goes up to 10% of the outstanding amount plus 2% per month for up to 20 months.