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Roth Conversion Calculator for Dividend Investors

Enter your qualified dividends and a conversion amount to see the real federal tax, including the hidden cost of pushing your dividends out of the 0% rate. Uses 2026 IRS brackets and thresholds.

2026 IRS Tax Worksheet Simulator

Roth Conversion & Dividend Bump Calculator (2026)

See where your low-cost conversion window stops and how much extra dividend tax a Roth conversion triggers.

$
$0$40,000$80,000
$
Total Federal Tax
$11,800
Ordinary: $5,800 | Div: $6,000
Dividend Tax Triggered
+$6,000
$40,000 bumped to 15%
Marginal Rate at $66,500
22.0%
Effective on conversion: 17.7%
10%–12% Low-Cost Ceiling
$25,550
Tax at ceiling: $945
Hidden 25%–27% Zone Alert: With $40,000 in qualified dividends, conversions between $25,550 and $65,550 push your dividends out of the 0% bracket into the 15% bracket dollar-for-dollar. Stopping at $25,550 costs $945 in total tax, whereas filling the nominal 12% bracket ($66,500) costs $11,800.

Why a Normal Roth Conversion Calculator Gets This Wrong

Most calculators tax a Roth conversion at its bracket rate. But qualified dividends are stacked on top of ordinary income. A conversion is ordinary income, so every converted dollar lifts your dividends. Once your taxable income passes the 0% ceiling for qualified dividends, each additional converted dollar is taxed at its bracket rate and pushes one dollar of dividends from the 0% rate to 15%.

For a single filer with $40,000 of qualified dividends in 2026, that turns part of the “12% bracket” into a 25% to 27% zone. Converting $66,500 costs $11,800 in federal tax instead of $5,800. The extra $6,000 is 15% of the dividends.

2026 Figures Used

  • Standard deduction: $16,100 single, $32,200 married filing jointly.
  • 0% rate on qualified dividends: taxable income up to $49,450 single, $98,900 married filing jointly (Revenue Procedure 2025-32).
  • Ordinary brackets: 10% to $12,400, 12% to $50,400, 22% to $105,700 (single); double for married filing jointly up to the 22% bracket.
  • Net investment income tax: 3.8% on dividends once modified adjusted gross income exceeds $200,000 single or $250,000 joint.

Frequently Asked Questions

How much can I convert tax-free if I live on dividends?

If your qualified dividends are under $49,450 (single), the first $16,100 of conversions is usually free. Your standard deduction was sheltering dividends that were already taxed at 0%, so the conversion can use it at no cost.

Where does the 27% zone end?

For a single filer under 65 with no other income, it always ends at a conversion of $65,550 ($131,100 for married couples), however large your dividends are. It starts at that amount minus your dividends.

Should I fill the 12% bracket with conversions?

If you live on qualified dividends, filling the 12% bracket often stops right after the most expensive dollars. Depending on your expected future tax rate, stopping before the zone or converting well into the 22% bracket is usually cheaper. Read the full analysis.

Does this include ACA subsidies, Medicare premiums, or state tax?

No. Conversions also raise the income used for ACA premium tax credits (which end entirely above 400% of the poverty line in 2026) and, from age 63, Medicare premiums two years later. Most states also tax conversions. See our state tax analysis and 0% dividend bracket guide.

Disclaimer: This calculator is for educational purposes only and is not tax advice. It estimates federal income tax for filers under 65 whose only other income is qualified dividends, using the standard deduction and 2026 rate schedules. It excludes state tax, health insurance subsidies, Medicare premiums, Social Security taxation, and credits. Consult a qualified tax professional before converting.