Starting in tax year 2019, the IRS has added a phone number line to Form 1040 in the signature section. This entry is optional at this time.
The IRS asks for your phone number in case they have a question about your return. They will not accept an international phone number on your return.
In order to complete and e-file your return, you can enter the phone number of a relative or friend in the U.S if you do not have a phone number, or a "dummy number." (800-555-1212).
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