What do you mean more than one tax? Like for different people or for more tax forms like your W2s and 1099s? You can only file one tax return and must report all your income on Your tax return. You can start a Turbo Tax Return and log in again later to finish it. You don’t have to have all your forms entered at one time. You can come back later and finish and file. But don’t file it until you have entered everything.
