Roth Conversion Tax, 5-Year Ladder & Medicare IRMAA Cliff Guide (2026): Converting in NY/NJ/MA vs. Waiting for FL, PA or NH Relocation

Should you convert your Traditional IRA or 401(k) to a Roth IRA in 2026—or wait until you relocate down the East Coast? Our 2026 statutory analysis models federal bracket-filling strategies (22% vs. 24% vs. 32%), the 5-year Roth conversion ladder, 2026 Medicare Part B & D IRMAA surcharge cliffs ($106,000 Single / $212,000 Married), and state tax arbitrage between NY/NJ/MA and FL/PA/NH.

How Roth Conversion Taxes Work in 2026 (IRC § 408A & Pro-Rata Rule Form 8606)

When you convert pre-tax funds from a Traditional IRA, SEP-IRA, SIMPLE IRA, or pre-tax 401(k) into a Roth IRA under IRC § 408A, the converted amount is added directly to your ordinary taxable income on IRS Form 1040 (and reported on Form 8606) for the calendar year in which the conversion occurs. In exchange for paying tax at today’s known marginal bracket, all future compounding, qualified withdrawals, and post-death beneficiary distributions (for 10 full years under SECURE 2.0) are 100% exempt from federal and state income tax and exempt from lifetime Required Minimum Distributions (RMDs).

The East Coast Domicile Arbitrage: Why Converting in NYC, NJ, or MA Costs 5% to 14.78% More Than FL, PA, or NH

One of the single largest avoidable mistakes among Northeast pre-retirees is executing a large Roth conversion before changing state domicile:

• New York City & New York State: NYS exempts only the first $20,000 of periodic pension/IRA distributions at age 59½+; large Roth conversions above that threshold face up to 10.9% NYS + 3.876% NYC = 14.776% combined state/city tax.
• Florida, Pennsylvania & New Hampshire (0% Conversion State Tax): Florida and New Hampshire levy 0% tax on retirement conversions, and Pennsylvania (72 P.S. § 7301(d)) exempts 100% of eligible retirement plan distributions and conversions after age 59½. Waiting until January 1 after establishing bona fide FL, PA, or NH domicile saves $21,000 to $29,500 in state tax per $200,000 converted.

The 2026 Medicare IRMAA Cliff Warning (2-Year MAGI Lookback)

Because Roth conversions increase your Modified Adjusted Gross Income (MAGI), crossing a Medicare Income-Related Monthly Adjustment Amount (IRMAA) tier by even $1.00 triggers an immediate annual surcharge on Medicare Part B and Part D premiums two years later ($106,000 Single / $212,000 Married Filing Jointly for Tier 1). Always check your conversion size against the IRMAA cliff in the calculator above.

Interactive 2026 Statutory Model & CPA Verification Checklist

Use the interactive simulator embedded above—or open the standalone Roth Conversion Tax, 5-Year Ladder & Medicare IRMAA Cliff Guide (2026): Converting in NY/NJ/MA vs. Waiting for FL, PA or NH Relocation Simulator →—to model your exact 2026 dollar figures, compare pre-loaded East Coast presets, and email or export a CSV/PDF worksheet for your CPA or real estate attorney.