Backdoor Roth IRA: the steps and tax checks for 2026.
A backdoor Roth IRA combines a nondeductible traditional IRA contribution with a Roth conversion. It can provide a route to a Roth IRA when income limits restrict direct contributions. The conversion is not automatically tax-free: existing pretax IRA balances and investment earnings can make part of it taxable.
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The 2026 IRA contribution limit
For 2026, the combined traditional and Roth IRA contribution limit is $7,500, plus a $1,100 catch-up for people age 50 or older, for a total of $8,600. Your eligible compensation can impose a lower ceiling. Using a backdoor approach does not create a second contribution allowance.
A conversion is different from a contribution. Moving an existing traditional IRA balance to Roth does not use the annual IRA contribution limit, but its taxable portion can increase income. Direct Roth contributions have an income eligibility test; conversions are not subject to that same income restriction.
These are 2026 contribution figures. For a prior-year contribution, use that year's limit and identify the contribution year with the custodian.
Three Roth transactions that should not be confused
| Transaction | Where the money starts | Central question |
|---|---|---|
| Backdoor Roth IRA | A nondeductible traditional IRA contribution | How much of the conversion is taxable after IRA aggregation? |
| Ordinary Roth conversion | Existing pretax retirement savings | How much income should be recognized, and when? |
| Mega backdoor Roth | Voluntary after-tax, non-Roth employer-plan contributions | Does the plan allow the contributions and a permitted route to Roth? |
Before contributing: check the entire IRA picture
- Confirm the contribution year, eligible compensation, age-based limit, and contributions already made to any traditional or Roth IRA for that year.
- List all traditional, traditional SEP, and traditional SIMPLE IRAs, including rollover IRAs held with other custodians.
- Locate prior Forms 8606 and supporting records of nondeductible contributions. An account balance is not the same as tax basis.
- Review other distributions, planned rollovers, required minimum distributions, and year-end IRA balances with your tax professional.
- Ask the custodian how to designate the contribution, execute the conversion, and obtain the reporting forms.
- Evaluate available cash, investment timing, and the possible tax cost before sending instructions.
How a backdoor Roth IRA works
A contribution and conversion can happen in different tax years. That is a reporting detail to reconcile, not a reason to report both transactions in the contribution year. Keep the amount, designated contribution year, and conversion date together.
| Step | Action | Check before proceeding |
|---|---|---|
| 1. Establish eligibility | Choose the contribution year and amount | Verify compensation, annual limits, and prior contributions |
| 2. Make the contribution | Contribute to a traditional IRA and treat the eligible amount as nondeductible | Do not also claim an IRA deduction for the same contribution |
| 3. Recheck tax exposure | Review aggregate IRA basis, pretax balances, and earnings | A separate empty IRA does not isolate the new contribution from the pro-rata calculation |
| 4. Convert | Instruct the custodian to move the intended amount to a Roth IRA | Record the amount and calendar year of the conversion; consider taxes and withholding separately |
| 5. Reconcile reporting | Match custodian records and the tax return | Retain contribution confirmations, Form 1099-R, Form 5498, and Form 8606 |
The pro-rata rule: a $7,500 example
Assume you have $92,500 of pretax IRA money and add a $7,500 nondeductible contribution. You convert $7,500 to Roth and leave $92,500 in traditional IRAs at year-end. Assume no other basis, earnings, distributions, rollovers, or adjustments.
The simplified denominator is $100,000: $92,500 remaining plus $7,500 converted. Your $7,500 basis is 7.5% of that amount. Of the $7,500 conversion, $562.50 is nontaxable and $6,937.50 is taxable. The remaining basis carries forward; it is not lost.
Opening a new IRA at another broker would not change this example. Form 8606 uses the relevant aggregated IRA amounts. Each spouse tracks their own IRA basis and reporting separately.
A rollover to an employer plan may be one planning option if the plan accepts the eligible pretax amount. Plan terms, transaction timing, basis, and distribution restrictions must be checked before using that approach.
Contribution deadlines and conversion years
A regular IRA contribution is generally due by the return filing deadline for that contribution year, excluding extensions. A conversion is reported for the calendar year in which it occurs. A prior-year contribution made early the next year and converted then can therefore appear across two years of reporting.
The relevant year-end IRA value is part of the pro-rata calculation. A rollover into a traditional IRA late in the year can change the tax result of a conversion completed earlier that year. Review the whole calendar-year activity before treating an early conversion as tax-free.
Do not wait until the final custodian processing day to discover a missing form or account restriction. Confirm processing times directly. Disaster relief and unusual filing situations require checking the applicable IRS notice.
A Roth conversion generally cannot be reversed by recharacterizing it back to a traditional IRA. Resolve the tax question before submitting the conversion.
What to give your tax preparer
The custodian reports account transactions; it may not know your basis at another custodian or your full tax history. A Form 1099-R marked with an undetermined taxable amount does not settle the tax calculation.
Use the form and instructions for the year being filed. At this review, the IRS's published Form 8606 instructions are for 2025; this guide separately uses the announced 2026 contribution limits.
- The amount and designated year of each traditional and Roth IRA contribution.
- All relevant Forms 1099-R and 5498, including forms received after the return deadline.
- Prior Forms 8606 and records supporting unused nondeductible IRA basis.
- December 31 values for all relevant traditional, SEP, and SIMPLE IRAs.
- Details of conversions, distributions, rollovers, recharacterizations, and excess-contribution corrections.
When a broader tax review is useful
A backdoor contribution can look simple while intersecting with a rollover, stock-option exercise, business income, or a larger conversion. The useful planning question is how the transaction fits your total tax picture and cash needs.
Taxstra can review the IRA records alongside the rest of your return and define any planning or filing work needed. Bring the account inventory and the decision you are considering, rather than just the amount you hope to move.
Common questions
Is a backdoor Roth IRA a separate account?
No. It is a common name for a sequence using a traditional IRA and a Roth IRA. The contribution, conversion, and reporting rules still apply to those accounts.
Is the 2026 backdoor Roth limit $7,500?
The 2026 combined IRA contribution limit is $7,500, or $8,600 at age 50 or older, subject to eligible compensation and contributions already made. That limit governs the contribution step, not the size of an ordinary conversion of existing savings.
Can I do this if I have a rollover IRA?
A rollover IRA does not automatically prevent a conversion, but its pretax balance can make the conversion partly taxable under the pro-rata rules. Review all relevant IRA balances and basis first.
Is a conversion immediately after contributing always tax-free?
No. Little or no investment gain does not remove existing pretax IRA balances from the pro-rata calculation. Timing alone does not establish a tax-free conversion.
Can I do a backdoor Roth and mega backdoor Roth in the same year?
Potentially. They use different accounts and limits. Each transaction must meet its own requirements, including the employer plan's terms for the mega backdoor strategy.
Can a married couple share one Form 8606?
No. Each spouse's IRA transactions and basis are tracked separately. When both spouses must file Form 8606, each completes their own form even on a joint return.
Sources and further reading
Educational information, not individualized tax, legal, or investment advice. Examples are hypothetical. Your records, tax year, state rules, and engagement scope determine the work required.
Discuss your next decision with Taxstra
Book a free 30-minute initial consultation. We will discuss your situation, whether we are a fit, and the scope and fees for the next step. The initial call is not a completed tax plan or a review opinion.
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