Question: how long do you have to file a gift tax return?
Answer: You many need to file a gift tax return The return is due by April 15 (July 15 in 2020) of the year after you make the gift—the same deadline as Form 1040. If you extend your 1040 to October 15, the extended due date applies to your gift tax return too. If you're married, you can't file a joint gift tax return.