Rollovers · 2025 and 2026

Using a 401(k) Reverse Rollover to Clear Pre-Tax IRA Balances

Published by Moss Ladder · Updated October 17, 2026 · Editorial policy

Executive summary

A reverse rollover is the common name for moving eligible IRA dollars into an employer retirement plan. It can reduce the IRA value used in a later pro-rata calculation, but only when the transaction is eligible and the receiving plan accepts it. Separate the mathematical projection from the administrator's approval, documentation requirements and actual year-end facts.

Educational guidance for ordinary scenarios. Check the official form's year and filing branches and obtain advice for your actual records.

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The taxable-only IRA-to-plan rule is the starting point

IRC § 408(d)(3)(A)(ii) addresses an eligible rollover from an IRA into an eligible retirement plan other than an IRA. Publication 590-A explains that the part otherwise taxable can qualify for an IRA-to-plan rollover; after-tax IRA basis generally cannot be transferred into that plan under this rule. This is an important distinction from simply converting part of an IRA to Roth, which ordinarily uses the annual pro-rata allocation. An IRA-to-plan rollover can isolate eligible pre-tax dollars under its specific rule when the required conditions are met.

For an IRA distribution rolled to a qualified plan, the special treatment can regard the rolled amount as taxable dollars first when the amount left in IRAs or not rolled over is at least the basis. Do not turn that statement into permission to transfer any amount from any source. Required distributions, inherited-account restrictions, SIMPLE limitations and other excluded transactions need separate review. An administrator's pre-tax certification request should be supported by complete records, not a box checked because the account is called a rollover IRA.

Check the receiving plan before planning around it

An employer 401(k), eligible 403(b), governmental 457(b) or the TSP may accept an eligible IRA rollover, subject to the plan's terms and operational rules. A plan is not required to accept every permitted rollover. Ask specifically about traditional IRA pre-tax dollars, traditional SEP or SIMPLE sources, basis certifications, required forms, direct-rollover instructions and deadlines. A general statement that the plan accepts rollovers may refer only to another employer plan rather than an IRA. Obtain a source-specific answer.

A Solo 401(k) is not an account anyone can open solely to avoid the pro-rata calculation. Eligibility depends on a real qualifying business and the plan's participation rules, including the treatment of employees other than an owner and spouse. Establishment, contribution eligibility and rollover acceptance are separate matters. Compare fees, investment options, creditor treatment and withdrawal features as well as the conversion projection. Moving assets can have consequences beyond a single year's tax allocation, and the lowest modeled immediate tax does not establish the best financial choice.

Work through an eligible pre-tax transfer

Assume an owner has a $28,000 total IRA pool consisting of $7,000 documented basis and $21,000 pre-tax value. A $7,000 Roth conversion is planned, and the remaining $21,000 is eligible for a rollover into a plan that actually accepts it. If the valid rollover removes that $21,000 from the applicable December 31 IRA balance and there are no other relevant transactions, the conversion pool is $7,000. The $7,000 available basis then covers the entire conversion, leaving zero taxable conversion and zero remaining basis.

Without the eligible transfer, a $7,000 conversion plus $21,000 year-end IRA value gives a $28,000 denominator. Only $1,750 of the conversion is tax free and $5,250 is taxable. The strategy comparison shows these alternative assumptions side by side using the existing engine. A projection labeled plan confirmation required means exactly that: the numbers assume eligibility and completion, while actual plan acceptance remains to be documented. It is not a claim that opening a plan automatically creates the tax result.

Post-rollover allocation: $21,000 eligible pre-tax money removed

This invented example assumes one taxpayer, documented basis, eligible ordinary transactions, no special repayment and no tax withholding. Dollar amounts are planning values. Use the official form's filing branches; a displayed line is not automatically a required entry on a filed return. The 2026 examples apply published 2026 contribution limits with the 2025 allocation structure.

Post-rollover allocation: $21,000 eligible pre-tax money removed
Form 8606 line	Modeled amount
1	$0.00
2	$7,000.00
3	$7,000.00
4	$0.00
5	$7,000.00
6	$0.00
7	$0.00
8	$7,000.00
9	$7,000.00
10	1.000
11	$7,000.00
12	$0.00
13	$7,000.00
14	$0.00
16	$7,000.00
17	$7,000.00
18	$0.00
15a	$0.00
15b	$0.00
15c	$0.00

Use a timeline with evidence, not just a target date

Start by reconciling basis and account types, then obtain written receiving-plan instructions. Confirm the proposed amount does not include after-tax basis or another ineligible distribution. Ask the IRA custodian how the distribution will be issued and the receiving plan how acceptance is confirmed. Allow time for rejected paperwork, custodial processing and holidays. The calendar-year projection assumes the correct December 31 IRA treatment; a pending request or an uncashed check may require a different outstanding-transaction analysis.

Keep source and destination statements, the administrator's acceptance, any pre-tax certification, the distribution confirmation and receipt evidence. Reconcile the resulting Forms 1099-R and other plan records. Form 8606 line 6 treats certain outstanding IRA-to-IRA rollovers differently from an outstanding IRA-to-qualified-plan rollover, so do not copy one rule into the other field automatically. If a transaction crosses year end or is rejected, obtain advice about the actual reporting rather than retaining the originally projected zero balance.

Respect SIMPLE, distribution and amount limits

A traditional SIMPLE IRA in its initial two-year participation period generally cannot use the ordinary transfer route to a non-SIMPLE IRA or employer plan. A nonqualifying transfer can have ordinary-income and additional-tax consequences. Required minimum distributions are not eligible rollover amounts. Other exceptions, repayments and inherited-account rules can also make a proposed amount ineligible. The model should show review required instead of converting those legal restrictions into an apparently approved savings strategy.

The amount modeled must not exceed both the available remaining IRA assets and the eligible pre-tax amount. If the owner leaves basis behind, do not also subtract that same basis from the year-end field after entering the actual remaining account value. Conversely, if only part of the eligible pre-tax assets is transferred, any pre-tax IRA value still present at year end continues to affect the conversion. Use a conservative projection when exact market values or paperwork are unresolved, and replace assumptions with the actual documents before filing.

Decide with the full return and retirement plan in view

Reducing the taxable portion of one conversion is not the only consideration. The receiving plan may have different investments, fees, distribution restrictions or protections. A full taxable conversion, a smaller conversion, a delay or leaving assets in an existing employer plan can all be meaningful alternatives under different circumstances. Future income, tax brackets, health-insurance costs and the source of cash used to pay tax can change the comparison. The website's strategy table does not model every lifetime or estate-planning effect.

Use the reverse-rollover questionnaire to gather answers, the strategy comparison to explore ordinary numbers and the document checklist to preserve evidence. Bring the exact facts to a qualified preparer and the plan administrator before requesting a transfer. Once complete, update the IRA inventory and basis ledger and reconcile the conversion year's Form 8606. A successful rollover is a real transaction supported by the applicable rules and plan records; a colored badge or zero-dollar estimate on a website is only an explanation of assumptions.

About the publisher: Moss Ladder

Moss Ladder owns and publishes RothProRata.com, an independent educational website about IRA basis, Roth conversions and Form 8606. The guides connect official sources with invented examples, document checklists and browser-local planning tools.

AI-assisted tools help prepare explanations and software. Numerical allocation examples state their assumptions and are checked with automated calculations. These engineering checks do not constitute independent CPA or Enrolled Agent review, and no professional tax credential is claimed.

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Official sources

Source year and transaction type matter. Citations support the explanation; they do not imply government endorsement.