Estimated tax payments for most business owners are due on April 15, June 15, September 15 and January 15 of the following year. Individuals who don't file estimated taxes can face penalties if they owe more than $1,000 on their annual returns, according to Bankrate.
The estimated tax rules apply to most individuals who are self-employed and those who have sole proprietorships, business partnerships or shares in an S corporation. Farmers and fishermen have only one estimated tax payment deadline, and that is January 15 of the following year. Individuals in those industries can avoid filing an estimated tax payment if they file an annual return and pay their complete tax bill by March 1, notes the Internal Revenue Service.