Because they released the refund and they didn't continue to send you letters requesting information, there is not reason to expect a reduction of your refund for the current year.
As a precaution, you might contact the IRS to see if they show any open requests for the information. You have time right now to supply anything necessary if applicable. Use the number on the letter or use the information here.
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IRS Hours of Telephone Service:
Monday through Friday, from 7:00 a.m. to 10:00 p.m. local time (Alaska & Hawaii follow Pacific Time). The best times to call during April are before 10:00 a.m. and after 7:00 p.m., and Monday is the heaviest traffic day.
(800) 829-1040
