You all know that tax calculation is not simple and I have to simplifed it to make my case, and here is my assumption
1) the $ amount I used in the calculation is assumed final taxable income (after all dedection & is in line 15 in 1040)
2) As I asid: the tax bracket (28%) is my highest tax bracket, not my effective tax bracket. please note, tax bracket change every several years & you have to make some assumption.
3) I used $53K SS benefit in the calculaton. $53000 Sn benefit is the one I assumed several years ago when I started plan my retirement.
Better and detail calculation can be found here
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https://www.calcxml.com/calculators/how-much-of-my-social-security-benefit-may-be-taxed?skn=#results
My key point is:
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