It makes it easier if you keep it all on one post/question.

In your last question, you said you had $5932 of Federal withholding, now you are saying $7265.  Why the difference?

If it was $5932 of Federal withholding, everything still sounds about right.  Between the $4000 of extra W-2 income and $1400 of taxable Social Security increase, that is about a difference in $800 in taxes.

@2015nhhmtx  Please look at your two actual returns side by side. They will tell you how much of your Soc Sec was taxable each year. Did you have any other income, such as interest or dividends?