According to the regulations of the United States federal tax bureau, companies need to file tax returns on time regardless of whether they have business or not. If the company is in a state with income tax, it must report the state tax return and the US federal government tax return. The company has operations in several states, such as California and other states, so each state needs to file tax returns. And when you make an account, you should list the sales amount of each state. Tax returns are based on sales, and each state is different. Income tax varies from state to state. Take California, which is often registered, as an example. The company accounts for 8.84% of its net profit. The time limit for filing and paying taxes is: within 4.5 months after the end of the fiscal year of Company C; Unless otherwise approved by LLC, before March 15 every year.