Retirement learning center · updated November 2, 2026

Backdoor Roth and Form 8606 Guide Library

Choose a complete guide below, from a first backdoor Roth contribution to detailed Form 8606 reporting and six worked taxpayer scenarios. Each article identifies its assumptions, links to official sources and connects the explanation to a relevant planning tool.

Published by Moss Ladder. Editorial policy and source review

2025 standard rules · 2026 form projections

Checking contribution eligibility? Use the 2025/2026 contribution and phase-out reference alongside the guide for your question.

A useful reading order

Start with the backdoor Roth overview to distinguish contributions from conversions. Then read the pro-rata explanation and basis guide before modeling a mixed IRA balance. Timing, SEP/SIMPLE and reverse-rollover articles address account and year-end questions that can change an otherwise clean-looking result.

The reporting walkthrough and common-mistakes guide explain how the annual records connect to Form 8606. The tax-consequences and five-year articles cover questions that a simple conversion estimate does not settle. For definitions and short technical answers, use the distinct reference encyclopedia rather than another copy of these article cards.

Sources and next steps

Updated November 2, 2026. Source links are references, not IRS endorsement or independent professional certification. Check the source year and the assumptions in each explanation.

IRS Form 8606 and Retirement Tax Reference EncyclopediaCalculation methodology and Form 8606 formulasBackdoor Roth planning checklist