Only the IRS knows. Generally, it takes about 16 weeks however, this is what the IRS is currently stating, "It’s taking us longer to process mailed documents including:
- Paper tax returns, and
- All tax return related correspondence.
We are processing all mail in the order we received it. Do not file a second tax return or call the IRS."
After you amend your return, you can check the status of your Form 1040-X, Amended U.S. Individual Income Tax Return using the Where's My Amended Return? online tool or by calling the toll-free telephone number 866-464-2050 three weeks after you file your amended return.
Keep in mind: You have 3 years from the date you filed your return or 2 years after you paid the tax due (whichever is later) to file an amendment.