Thanks Bruce. Edited answer below:Ok. It's time you do some readingu2026and if your business made decent money, get a tax accountant.Self employed / sole proprietor: 1040Self employed / LLC: must file Corp business filing and issue K1 then 1040Self employed / LLC w S Corp option: (you should have been on your own payroll) must file Corp business filing and issue K1, then 1040Self employed / C Corp: (you should have been on your own payroll) must file Corp business filing and issue 1099 DIV, then 1040.Corporate business filing and tax is due March 15. You can extend the filing, but any tax is due the March 15. If you don't pay on or before March 15, fees and interest are applied.Personal filing and tax is due April 15. You can extend the filing, but any tax is due on April 15. If you don't pay on or before April 15, fees and interest are applied.Same for your sister.Don't forget to file/pay the company's sales and use taxes, if applicable (State).You will also have to do corporate and personal filings with your state.