I am being told my federal refund will be $1,000. Earlier, Turbotax found I had overpaid my social security tax by about $3500. Is this calculated in my refund?

[VolvoGirl]

Yes it should be.  But that is quite a large excess.  Are you married?  Be sure you entered each W2 under the right person.  Or it will think one person when over the max SS.

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.