@DONNIE67
The IRS website lets you print your transcripts for prior years. That would let you see what they have as your AGI for last year. Also, if you had unemployment income in 2020 and filed your return before the February 2020 bill passed that let you exclude unemployment income up to some amount, the IRS didn't require refiling but corrected it on their end. Another potential reason why your records may not line up with their records.
