Question: how many years do you have to file business taxes?
Answer: If you are taxed as a C-Corp, you need to file a Form 1120, you must file it by the 15th day of the forth month following the close of the tax year, which for most taxpayers is April 15. (However, for 2019 tax returns filed in 2020, the April 15 deadline has been extended until July 15, 2020.)