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Retirement learning center · reviewed October 10, 2026

Common backdoor Roth mistakes

Most preventable mistakes begin with incomplete records or a transaction planned in isolation. Use this guide as a review agenda.

2025 standard rules · 2026 form projections

Answer every question. “Yes” flags a topic to investigate, not a finding that your return is wrong. An unanswered question is not treated as “No.”

Have you left SEP or SIMPLE IRA balances out of your calculation?
Are you assuming an empty account today means a zero December 31 balance?
Was an IRA rollover still outstanding at year end?
Are prior nondeductible basis records missing or uncertain?
Is the contribution tax year different from the conversion year?
Might combined traditional and Roth contributions exceed your eligible limit?
Have you considered only the IRA used for the conversion?
Are you assuming every backdoor Roth conversion is tax-free?
Are you assuming a workplace plan accepts IRA rollovers?
Was a required Form 8606 missed or filed with uncertain figures?
Are you planning to undo or recharacterize a completed Roth conversion?
Did the traditional IRA earn money between contribution and conversion?
Were there other IRA withdrawals during the conversion year?
Do your Forms 1099-R, custodian records and Form 8606 disagree?
Is your SIMPLE IRA within its initial two-year participation period?
Do you have an inherited IRA, QCD, repayment, recharacterization or Roth withdrawal?

0/16 answered; 0 topics flagged.

Topics to review

Answer the questions to build your review list.

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Reviewed October 10, 2026. IRS reference. 2026 Form 8606 output is a planning estimate based on the 2025 structure.

Check before acting

Look for forgotten rollover accounts and employer-funded IRA balances. Do not equate a brokerage balance with your documented after-tax basis. Keep each spouse's records separate.

  • Using a contribution limit from the wrong year.
  • Treating unknown prior basis as zero without checking.
  • Overlooking an IRA transfer later in the calendar year.
  • Using a marginal-rate estimate as your total tax bill.

When a transaction has already happened

Gather dates and statements before attempting a fix. Ask a qualified tax professional to review contribution corrections, missing forms, and specialized distributions. The website cannot reverse a completed transaction.

Sources and next steps

Reviewed October 10, 2026. This independent educational website is not affiliated with the IRS. Special transactions need professional review.

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