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One thing I picked up on is that you said he had a standard deduction of $27,549.  If you're filling separately, he does not get that deduction. You would each get $12,950 plus $1,400 if your over 65 years of age.  This would account for the discrepancy in the tax amount.

You can see his 1040 tax return.

Standard or Itemized deduction is on line 12.

1. On the menu bar on the left that shows.
   1. My Info
   2. Federal
   3. State
   4. Review
   5. File
2. Select Tax Tools
3. On the drop-down select Tools
4. On the popup menu
5. Select View Tax Summary
6. On the left sidebar

Select Preview my 1040.

Line 15 - Taxable Income

Line 24 - Total Tax.

Line 25 - Withholdings.

Line 33 - Payments including Credits.

Line 34 - Overpayments.

Line 37 - Tax owed.

For single taxpayers and married individuals filing separately, the standard deduction is $12,950 in 2022.

For married couples filing jointly is $25,900, and 

If you're at least 65 years old or blind, you can claim an additional 2022 standard deduction of $1,400.

If this does not completely answer your question, please contact us again and provide some additional details.