If you e-file by the deadline and the return is in pending past the deadline, the return will still be considered timely when it is accepted. But is it still never a good idea to take it right down to the last second. If you are getting a refund there is no penalty for being late. If you owe tax due you need to pay your estimated tax by May 17. If you cannot get your return ready by the deadline you can get an extension to file, but you still have to pay by May 17.
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