Did you enter that you made $600 of charitable donations? $27,400 + 600 = $28,400
2021 STANDARD DEDUCTION AMOUNTS
SINGLE $12,550 (65 or older + $1700)
MARRIED FILING SEPARATELY $12,550 (65 or older + $1350)
MARRIED FILING JOINTLY $25,100 (65 or older + $1350 per spouse)
HEAD OF HOUSEHOLD $18,800 (65 or older +$1700)
Legally Blind + $1350