Roth Conversion Guide (2026): Ladder, Math, and Cliff Avoidance

A complete walkthrough of how Roth conversions work for early retirees in 2026: when the conversion ladder beats a 72(t) SEPP, how to size each conversion against the ACA cliff and IRMAA brackets, and where the pro-rata rule trips people up.

Pair this guide with the interactive Roth Conversion Sizer to test specific scenarios against 2026 OBBBA-extended brackets.

9 articles · last reviewed 2026-05-17 · part of the QuantCalc research library

The conversion ladder mechanic

Conversion math under 2026 OBBBA brackets

Backdoor and mega-backdoor variants

Roth vs. traditional decisions

Conversions and the IRA tax bomb