Before making any corrections, call the IRS at the number on the letter and explain your situation. Follow any instructions they give you over the phone.
It’s really best to contact them in person rather than risk sending in something you’re not sure about and being tied up for months in a prolonged correspondence exchange. Be patient, if you have to wait on the phone; filing season is just starting and it may take you awhile to get through.
If this doesn’t work, please respond and clarify: Did the IRS only ask you about Schedule C? Was Form 2555 mentioned at all, or did you simply discover the mistake on the form after filing?
