Issue: my client has W-2 box# 12 code W $ 3555. after entering all the forms into Proconnect, it shows the client has a balance due of $ 3,675.

For testing purposes, I entered all the information again in Turbo Tax, it's telling me the client has a balance due of $ 5,024 (1,349 difference).

I compared both 1040 Forms between Proconnect and Turbo Tax, and have noticed Form 1040 line# 11 AGI is off by the exact $ 3555 ($ 208,052 from Proconnect, and $ 211,602 from Turbo Tax). the HSA max employer contribution was captured by Turbo Tax on 1040 Form line# 8 other income from Schedule 1, Line 9 $ 3555.

https://www.irs.gov/pub/irs-dft/p969--dft.pdf

Am I missing anything here?