ProSeries will automatically calculate the Schedule 3 line 10 if the tax return contains excess social security or tier 1 RRTA tax withheld. There are two common scenarios that trigger this calcualtion:
Multiple W-2's during the year
If the taxpayer or spouse had more than one employer during the tax year and the total Social Security tax or Railroad Retirement Tax Act (RRTA) tier 1 tax withheld was over the limit for that tax year, the program automatically calculates the amount of excess social security tax or RRTA tier 1 tax withheld.
Spouses W-2 is not marked correctly
This issue can also happen if the spouse W-2 doesn't have the Spouse's W-2 box checked. Review the W-2 worksheets to make sure they're entered correctly; remove any W-2 worksheets that are no longer needed.