Educational disclaimer: This article is for general U.S. tax education only and is not tax, legal, investment, or personalized financial advice. Roth conversions, nondeductible IRA contributions, the pro-rata rule, Form 8606 reporting, contribution limits, and MAGI phaseouts change by tax year and depend on your facts. Dollar figures are year-labeled from IRS Publication 590-A, Publication 590-B, Topic 309, Form 8606, and Form 8606 instructions fetched for this guide. Do not treat this as a recommendation to convert, contribute, or file a particular way. Confirm with the current-year IRS publications and a qualified tax professional before you act. FitCreeper does not prepare returns. Contact: fryntavo@gmail.com.

What Is a Roth Conversion? Beginner Guide

By Ahmad Dogar
FitCreeper Finance · Educational only — not personalized insurance, tax, legal, or financial advice

How this article was made: Drafted with AI assistance, then checked against primary IRS sources fetched for ops day 2026-09-28 (Asia/Karachi): Publication 590-A (2025, including What’s New for 2025 and 2026), Publication 590-B (2025), Tax Topic 309, About Form 8606, Instructions for Form 8606 (2025), Roth IRAs overview, and IRS IRA FAQs on conversions. Re-check the current-year IRS pages before you convert, contribute, or file.

Searching what is a Roth conversion usually means you have money in a traditional IRA (or similar pre-tax retirement dollars) and are asking whether moving some of it into a Roth IRA is worth the tax bill. IRS Tax Topic 309 states that regardless of the amount of your adjusted gross income, you may be able to convert amounts from a traditional IRA into a Roth IRA. You also may be able to roll over amounts from a qualified retirement plan to a Roth IRA. A Roth IRA differs from a traditional IRA in that contributions aren’t deductible and qualified distributions aren’t included in income.

This beginner guide explains what a conversion is, how it differs from an annual Roth contribution, and which IRS publications to open next—Publication 590-A and Publication 590-B. It is educational only, not tax advice. Pair with FitCreeper’s live Roth vs traditional IRA and IRA beginner guides.

What “conversion” means in IRS language

IRS IRA FAQs (Retirement plans FAQs regarding IRAs) describe converting a traditional IRA to a Roth IRA by (1) a rollover—you receive a distribution and contribute it to a Roth IRA within 60 days; (2) a trustee-to-trustee transfer directly between institutions; or (3) a same-trustee transfer if both IRAs are at the same financial institution. A conversion results in taxation of any untaxed amounts in the traditional IRA and is reported on Form 8606.

Publication 590-B reminds readers that although a conversion is considered a rollover for Roth IRA purposes, it is not an exception to the rule that distributions from a traditional IRA are taxable in the year you receive them. Conversion amounts are includible in income under the conversion rules in Publication 590-A.

No MAGI limit on conversions (Topic 309)

Topic 309 is explicit: regardless of AGI, you may be able to convert traditional IRA amounts to a Roth IRA. That is different from making a regular Roth IRA contribution, which is limited by modified AGI. Publication 590-A’s What’s New sections publish year-labeled Roth contribution phaseouts—for example, for 2025, married filing jointly phaseout begins at a modified AGI of at least $236,000 with no Roth contribution at $246,000 or more; for single/head of household (not living with a spouse), phaseout begins at $150,000 with no contribution at $165,000 or more. For 2026, Publication 590-A lists higher thresholds (joint phaseout starting at $242,000 with no contribution at $252,000 or more; single/head of household phaseout starting at $153,000 with no contribution at $168,000 or more). Those contribution limits are not conversion eligibility caps.

Not the same as an annual Roth contribution

Annual IRA contributions for 2025 are generally limited to $7,000 ($8,000 if age 50 or older) per Publication 590-A; for 2026 the same publication’s What’s New section raises the limit to $7,500 ($8,600 if age 50 or older). Conversions are not those annual contribution slots. Pub 590-A’s rollover chart notes that conversions from traditional IRAs to Roth IRAs must be included in income, and the one-rollover-per-year limitation that applies to some IRA-to-IRA rollovers does not limit conversions the same way—Publication 590-A states trustee-to-trustee transfers aren’t limited and rollovers from traditional IRAs to Roth IRAs (conversions) aren’t limited by that one-rollover-per-year rule.

*Figure:* Conversion vs annual contribution

Conversions after 2017 cannot be recharacterized

Topic 309 and the Instructions for Form 8606 (2025) state that conversions after 2017 from a traditional IRA to a Roth IRA may not be recharacterized. Amounts rolled over after 2017 from a qualified retirement plan to a Roth IRA also may not be recharacterized. Publication 590-B likewise notes that a conversion made in tax years beginning after December 31, 2017, cannot be recharacterized as having been made to a traditional IRA. Beginners should treat conversion tax outcomes as sticky.

*Figure:* No recharacterization after 2017

Everyday example (educational)

A saver with a traditional IRA asks the custodian to transfer $10,000 to a Roth IRA in the same year. Untaxed amounts in that conversion are included in income for the year and reported using Form 8606 Part II, following the form instructions. Whether that move “makes sense” depends on tax bracket, cash to pay the tax, and future plans—topics for a later post and a tax professional, not a slogan here.

Myths

High income blocks all Roth conversions — Topic 309 says conversions are not barred by AGI the way contributions can be.
A conversion is just another $7,000 contribution — false; contribution limits and conversions are different rules (Pub 590-A).
You can undo a conversion next April if markets fall — not for conversions after 2017 (Topic 309 / Form 8606 instructions).
Roth conversion income is always capital-gain taxed — Pub 590-B treats taxable traditional IRA distributions as ordinary income.

Habit stack

Read Topic 309 and the conversion sections of Pub 590-A/B.
List traditional/SEP/SIMPLE IRA balances and any basis from Form 8606.
Estimate taxable conversion income before requesting a transfer.
Plan how you will pay the tax from non-IRA cash if possible.
File Form 8606 for the conversion year as required.

Checklist

I can define a Roth conversion in one sentence using IRS methods.
I know AGI limits Roth contributions, not conversions (Topic 309).
I know post-2017 conversions cannot be recharacterized.
I will use year-labeled Pub 590-A figures only as published.
I will not treat this as advice to convert.

See IRA contribution limits 2026, 401(k) beginner guide, and Form W-4 withholding for adjacent tax and retirement education.

Additional practice notes for beginners

Open Publication 590-A Table I-2 comparing traditional and Roth IRAs. Conversions move dollars from the traditional column’s tax rules toward the Roth column’s distribution rules—after you pay tax on untaxed amounts.

Ask your IRA custodian which of the three IRS FAQ methods they support and what paperwork they require. Same-trustee transfers can be operationally simpler than 60-day rollovers that put a check in your hands.

Avoid the 60-day rollover trap if you can use trustee-to-trustee movement. Missing the 60-day window can turn an intended conversion into a taxable distribution without a completed Roth contribution.

Track basis from nondeductible traditional IRA contributions on Form 8606. Basis can make part of a conversion nontaxable, but the pro-rata rule (covered in a later post) aggregates IRAs.

Year-label every limit you write down. Pub 590-A’s 2025 contribution limit ($7,000 / $8,000 age 50+) is not the 2026 limit ($7,500 / $8,600 age 50+).

Roth contribution MAGI phaseouts for 2025 and 2026 in Pub 590-A are for contributions. Do not paste them into a note titled “conversion eligibility.”

If your only retirement money is a 401(k), read plan rules for in-plan Roth rollovers or distributions eligible to move to a Roth IRA. Topic 309 notes you may be able to roll over qualified plan amounts to a Roth IRA—plan documents still control availability.

Coordinate with estimated taxes if a conversion will create a large balance-due. See FitCreeper’s estimated taxes for side hustles for IRS estimated-tax education habits—not as a conversion endorsement.

Keep the Form 1099-R you receive for the conversion year with your tax file. Custodians report distributions even when the money moved to a Roth.

Read Pub 590-B’s reminder that conversions are includible in income in the year received. Timing within December versus January changes the tax year.

Do not convert amounts you will need soon for living expenses. Roth qualified-distribution rules and early-distribution add-ons are separate topics in Pub 590-B.

If you are near RMD age, remember Pub 590-B: traditional IRA owners generally must begin RMDs by April 1 of the year after turning 73 (for those who reach age 72 after December 31, 2022). Conversion planning intersects RMD rules in ways a tax professional should review.

Spouse IRAs are separate. Each spouse’s conversions and Forms 8606 follow that spouse’s IRAs.

Recharacterize annual contributions is still a different tool from undoing conversions. Topic 309 allows certain contribution recharacterizations but not post-2017 conversion recharacterizations.

Use brokerage vs retirement account education to remember taxable brokerage sales are not Roth conversions.

When markets are volatile, remember you cannot recharacterize a post-2017 conversion if the Roth balance falls. That IRS rule is a planning constraint, not a market forecast.

Write questions for your tax preparer: How much tax would a $X conversion add? Does pro-rata apply? Will this affect premium tax credits or other MAGI-based items? This article does not answer those personally.

Store links to IRS.gov/Pub590A, IRS.gov/Pub590B, Topic 309, and Form 8606 in your retirement folder.

FitCreeper author Ahmad Dogar provides educational explainers only; fryntavo@gmail.com is the public contact. We do not prepare returns or recommend conversion amounts.

Continue to the taxes post next for Form 8606 mechanics, then backdoor Roth and pro-rata posts if income limits block direct Roth contributions.