There were line and schedule changes from 2018 to 2019.
For 2018, If you had more than one employer and the total of box 4 (only box 4 not box 6) on all your 2018 W2s for Social Security is more than $7,960.80 you get the excess back on your tax return. And it is for each spouse separately, not combined. Check 1040 schedule 5 line 72 for it. Then schedule 5 goes to 1040 Line 17.
For 2019,
If you had more than one employer and the total of box 4 (only box 4 not box 6) on all your 2019 W2s for Social Security is more than $8,239.80 you get the excess back on your tax return. And it is for each spouse separately, not combined. Check 1040 Schedule 3 line 11 for it. Then Schedule 3 goes to 1040 line 18d.
