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In 2026 a surviving spouse pays about 45% more federal income tax on the same $100,000 of taxable income after filing shifts from joint to single. Q3 Advisors quantifies the widow’s penalty across brackets and Medicare IRMAA.

Q3 Advisors’ Roth Delay Penalty puts a dollar figure on delaying a Roth conversion: about $1,774 of extra first-year RMD per year of delay on a $1M pre-tax balance (US, 2026 federal rules), from the IRS Uniform Lifetime divisor 26.5 and a conservative 4.7% growth anchor.

The RMD tax bomb threshold for a single filer is about $1.98 million in 2026: the pre-tax IRA/401(k) balance where a first-year required minimum distribution first reaches the 22% federal bracket, after the OBBBA senior deduction.

A 2026 index of state income tax on a standardized $100,000 Roth conversion across all 51 US jurisdictions: $0 in nine states, up to $13,300 in California, plus the federal, NIIT, and IRMAA stack and the residency-timing rule.

Reaching IRA Millionaire status — a seven-figure balance across traditional IRAs, 401(k)s, and similar pre-tax accounts — puts a household in the top 10% of […]

What is taxable income? See how gross income becomes AGI and taxable income, what counts, what is excluded, and 2026 standard deduction figures.

Effective tax rate vs marginal tax rate explained with a worked 2026 bracket example, plus why your average rate stays below your top bracket.

A 1099-DIV reports dividends and distributions of $10 or more to you and the IRS. See the 2026 box-by-box breakdown, qualified vs. ordinary dividend tax rates, and how to report it.

The 2026 Social Security wage base is $184,500, up from $176,100 in 2025. See the 2026 OASDI and Medicare rates, max tax, COLA, and how a Roth conversion fits.