What does this tool actually do?
It OCRs a Form 1040 (and works with digital PDFs too), pulls Social Security benefits, interest, and dividend income, then runs the real IRS Social Security Benefits Worksheet twice — once as filed, once with the interest/dividend income removed — to isolate exactly how much of the SS-benefit taxation (and, separately, any Medicare IRMAA surcharge) is attributable to that income.
Optionally, it illustrates a Tax-Deferred Annuity or Split Annuity strategy to reduce or eliminate that impact, using real, periodically-refreshed carrier rate data where available, and estimates any resulting Roth conversion room.
Every figure is computed from public IRS/CMS data and disclosed assumptions — nothing here is personalized advice.