I accidently entered both W2 (wife and me) on same name see the total refund $3000 more than entering it seperate name (correct), Why?

[karichery]

Since the total income is same, I expect similar refund other the wife is as my dependant benefit.

In both case total W2 income shows the same, but total refund is significally different..

[Opus 17 · Accepted solution]

If Turbotax thinks that both W-2s are yours, and that your total income is more than $118,000 (about) it will think you had excess social security withheld and will add a refund of excess social security to the rest of your tax return.  (If you leave it like this, the IRS will eventually figure it out and bill you for the refund you shouldn't have gotten along with interest and late fees.)