Thanks for the tip on comparing the 1040's. I'll look into that.
I'm well below the 32% bracket; just breaking into the 24%. Take standard deduction.
The added $10,000 interest was just testing a what if scenario. My expectation was a straight 24% tax.
D'OH! A Homer Simpson moment.
Typing this out it dawned on me that I lose part of the Additional Senior Deduction.
That explains change in the marginal rate.
Thanks for the memory jogger.
SOLVED.
