Legal Question in Tax Law in Florida

At the least, if the business itself is no longer operating, you need to file your final federal returns, whether 1120S, or partnership, depending on how you have operated. Also your final 941's for payroll tax and 940 for federal unemployment and UCT-6 for state unemployment. You may also need to issue 1099's to third parties as applicable. These would be filed at their usual times.

If applicable, you need to file your final state sales and use tax returns. Be sure to notify them the business is closed or they will treat you as though it is open and this could result in problems later.

If you are still in business, then you should file all the above returns as usual. You need to decide whether to reinstate with the Secretary of State as it may affect what returns you need to file AND the IRS may not recognize the entity or may treat you as a defacto partnership or sole proprietorship.

The above may not be exhaustive of all your requirements, but it should give you a good start.