1. My social security is already at 85%. That doesn't change in any scenario.
2. Hypothetical data points:
Line 7 - $11,334; Tax - $1170
Line 7 - $21, 334; Tax - $3140, Difference = $1,970 or 20%
3. I agree that some other income source or limit or qualification or something is changing the tax calculations, but it isn't social security.
4. I'll probably have to just experiment with ranges to identify the "sweet spot", but that really isn't what I wanted. My goal was to find that sweet spot without trial and error and Line 7 doesn't do it.
Thanks for the responses.
