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There is no universal winner. Converting a traditional IRA to a Roth IRA generally moves the income-tax bill to the conversion year. Leaving the traditional IRA intact usually postpones that tax until beneficiaries take taxable distributions. The better path depends on the conversion amount and year, your existing IRA basis, your required minimum distributions, who would inherit the account, how quickly that person must withdraw it, and the federal and state tax rules that apply when money comes out.
This guide explains the federal framework in effect for the 2025 IRS publications available in October 2026. It is educational information, not individualized tax, estate or investment advice.
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The basic tradeoff: pay income tax now or leave a taxable account
A Roth conversion transfers money from a traditional IRA to a Roth IRA. Under IRS Publication 590-A (2025), amounts converted are generally included in your gross income for the year of conversion. The taxable amount is affected by your basis in traditional, SEP and SIMPLE IRAs, so a conversion is not automatically taxable dollar for dollar.
If you do not convert, the traditional IRA remains subject to its normal distribution rules. After your death, beneficiaries generally include taxable distributions in their own gross income under IRS Publication 590-B (2025). The beneficiary’s tax year, income level and required withdrawal schedule can therefore determine how burdensome the inherited account becomes.
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The comparison is about timing and control, not a promise that one strategy saves more tax in every family. A conversion can be attractive when you can pay tax at a relatively favorable rate and expect beneficiaries to face higher rates or compressed withdrawal years. Keeping the IRA may be preferable when paying a large tax bill now would strain cash flow, when beneficiaries are likely to withdraw slowly at lower rates, or when your basis makes the immediate conversion less taxable than expected.
What a Roth conversion does in the year you make it
Converted amounts normally enter current-year income
The IRS generally treats a traditional-IRA-to-Roth-IRA conversion as income in the year it occurs. A conversion completed during one tax year is therefore evaluated against that year’s income, deductions, filing status and tax brackets. A large single-year conversion can produce a different result from several smaller conversions spread across multiple years.
Only the taxable portion is included. Nondeductible contributions and other documented basis can reduce the taxable share under the applicable aggregation rules. Gather your Form 8606 records and records for all traditional, SEP and SIMPLE IRAs before estimating the bill. Missing basis information can lead to an incorrect assumption that every converted dollar is taxable or that every dollar is tax-free.
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Required minimum distributions must be handled first
Traditional IRA owners generally begin required minimum distributions (RMDs) at age 73 under the current federal framework. The IRS’s Required minimum distributions FAQs explain the general starting-age rule.
An RMD already due for a year cannot be eliminated by converting it. The RMD must be distributed under the applicable rules; an amount that is required to be distributed is not turned into a tax-free conversion merely because it is moved before year-end. After satisfying the year’s RMD, you can evaluate whether an additional amount should be converted.
Recharacterization is generally unavailable for post-2017 conversions
For a tax year beginning after December 31, 2017, a Roth conversion generally cannot be recharacterized back into a traditional IRA contribution. That makes the amount and timing consequential: a conversion that creates more taxable income than expected usually cannot simply be undone through the old recharacterization process. Verify the rules for the specific tax year before acting.
What happens when heirs inherit an unconverted traditional IRA
Beneficiaries generally pay income tax as they withdraw taxable money
An inherited traditional IRA is not automatically tax-free to the recipient. Beneficiaries generally include taxable distributions in gross income. Amounts representing basis may receive different treatment, but the beneficiary must have reliable records to claim it.
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The account’s investment growth is not itself a tax bill at death. Tax usually arises as distributions are made, subject to the distribution requirements that apply to the beneficiary category and the owner’s death date and RMD status. Consequently, two heirs who inherit similar balances can face very different results if one has a high-income year or a shorter mandatory withdrawal period.
The 10-year rule is common, but it is not the whole rule
IRS Publication 590-B states: “Distributions to a designated beneficiary who is not an eligible designated beneficiary must be completed within 10 years of the death of the owner.” That deadline is a central rule for many adult children and other individual beneficiaries, but it does not mean every heir has exactly ten years with no interim requirements.
Whether annual distributions are required during the 10-year period can depend on the owner’s age at death, whether the owner had reached the required beginning date, the beneficiary’s classification and the regulations applicable to the death year. Current IRS guidance should be checked for the particular account. Do not treat “ten years” as a complete distribution schedule without identifying those facts.
Beneficiary status changes the timetable
The IRS recognizes several eligible designated beneficiaries (EDBs):
- The owner’s surviving spouse.
- The owner’s minor child, subject to the rules that apply when the child reaches the age of majority.
- An individual who is disabled under the applicable federal standard.
- An individual who is chronically ill under the applicable federal standard.
- An individual who is not more than 10 years younger than the owner.
Other individuals, a trust, an estate or a beneficiary designation that does not meet the designated-beneficiary requirements can produce different payout rules. The IRS’s Retirement topics – Beneficiary page provides the general categories, while Publication 590-B describes the distribution framework in more detail.
Special choices available to a surviving spouse
A surviving spouse who is the sole beneficiary generally can choose between treating the deceased spouse’s IRA as the survivor’s own IRA or remaining a beneficiary. The choice changes the applicable RMD framework and can affect when distributions must begin and how the account is administered.
Owner treatment can simplify administration and may be useful when the survivor does not need immediate withdrawals. Remaining a beneficiary can preserve beneficiary-specific treatment that may fit the survivor’s age or cash-flow needs better. The correct choice depends on the spouse’s age, whether the deceased had begun RMDs, the need for distributions and the couple’s broader tax plan.
Do not retitle or roll over an inherited IRA casually. Confirm the beneficiary designation, the account registration, the owner’s RMD status at death and the custodian’s procedure before making an election.
Roth IRA inheritance is different, but not automatically unlimited tax-free money
A Roth conversion changes the account’s tax character for future distributions, but heirs still must follow inherited Roth IRA rules. Whether a beneficiary’s distribution is qualified can depend on the Roth five-year rules and the beneficiary’s circumstances. Therefore, describing every inherited Roth distribution as automatically tax-free is too broad.
The Roth account also has beneficiary distribution deadlines. Converting does not allow an owner to ignore beneficiary rules or eliminate the need to name and periodically review beneficiaries. Ask for the current IRS treatment of inherited Roth accounts for the owner’s death year and the beneficiary’s classification.
Side-by-side comparison
| Issue | Convert during life | Leave traditional IRA intact |
|---|---|---|
| Primary tax event | Generally taxable income for the owner in the conversion year, subject to basis. | Beneficiaries generally include taxable distributions in their own gross income. |
| Timing control | Owner chooses the conversion year and amount, subject to current rules and available cash for tax. | Tax timing is driven by the owner’s RMDs and the beneficiary’s required distribution schedule. |
| Basis relevance | Documented basis can affect the taxable share of a conversion. | Basis records can affect the taxable share of beneficiary distributions. |
| Owner RMD interaction | An RMD already due must be taken separately; it is not converted tax-free. | Owner RMDs continue while the owner is alive under the applicable rules. |
| Beneficiary deadline | Beneficiaries still follow inherited Roth IRA rules, including applicable five-year and payout rules. | Many non-EDB designated beneficiaries must empty the account within 10 years, with possible annual requirements depending on the facts. |
| Who bears the income tax | Usually the owner, in the conversion year. | Usually the beneficiary, as taxable distributions are received. |
| Spouse treatment | A surviving spouse generally has inherited-Roth choices under the beneficiary rules. | A surviving spouse who is sole beneficiary generally may treat the account as their own or remain a beneficiary. |
Questions that determine which strategy is more suitable
What tax rate applies now, and what rate may apply later?
The central comparison is the owner’s tax cost on conversion versus the beneficiaries’ tax cost on withdrawals. Future tax rates are uncertain. A conversion may move income into a lower-rate year for the owner, but a large conversion can also stack on top of other income. Leaving the account may defer tax until a beneficiary has a lower-income year, or it may force distributions during years when that beneficiary already earns substantial income.
Use actual projected income for the specific year rather than a slogan such as “pay tax now while rates are low.” Tax law, filing status, deductions and the beneficiary’s future circumstances can all change.
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A partial conversion can limit the amount recognized in one year. Multiple annual conversions provide more opportunities to reassess income, basis, cash available for tax and legislative changes. They also create additional administrative steps and do not guarantee a lower total tax.
A single conversion may be easier to execute but can create a large one-year income inclusion. Compare the proposed amount with your expected taxable income for that year and confirm that you can pay the tax without using money that you need for living expenses or required distributions.
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What is the IRA’s basis?
Basis generally comes from nondeductible contributions and must be tracked across applicable IRA accounts. Form 8606 is the key record for many taxpayers. Ask a tax professional to reconcile prior returns, Forms 8606 and current account statements before calculating a conversion. An estimate based only on the current account balance can be materially wrong.
Who will inherit the account?
Identify each primary and contingent beneficiary and classify them under the federal rules. A spouse, minor child, disabled or chronically ill individual, person within 10 years of the owner’s age, adult child, trust and estate do not necessarily receive the same treatment.
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How quickly is the beneficiary likely to need the money?
The account’s distribution period matters as much as the headline deadline. A beneficiary who must withdraw a substantial balance over a compressed period can face taxable income in years when their wages or business income are high. Another beneficiary may have flexibility to take distributions in lower-income years, subject to the rules that apply to the account.
Do not assume that delaying every withdrawal is always best. If annual distributions are required, missing one can create penalties and administrative problems. Confirm the schedule with the custodian and a tax adviser.
Can the owner pay the conversion tax from outside funds?
Paying the income tax from non-IRA cash generally leaves more money inside the Roth than withholding part of the conversion to pay the bill. Whether that is sensible depends on liquidity, emergency reserves, investment goals and the tax estimate. The federal rules do not establish an optimal funding source for every taxpayer, so model the cash-flow effect before converting.
A practical decision process
- Inventory every retirement account. List traditional, SEP and SIMPLE IRAs, current balances, prior nondeductible contributions and the latest beneficiary forms.
- Confirm RMD status. Determine whether you have reached age 73, whether the current year’s RMD has been calculated and whether it has already been distributed. Separate that RMD from any conversion amount.
- Reconstruct basis. Collect Forms 8606 and prior returns. Ask for a written calculation of the taxable and nontaxable portions under the aggregation rules.
- Model the conversion year. Estimate taxable income with no conversion, a partial conversion and the proposed full amount. Include the tax payment’s effect on cash reserves.
- Map beneficiary categories. For each beneficiary, record relationship, age relative to the owner, disability or chronic-illness status, trust or estate involvement and likely need for withdrawals.
- Map the inherited-account timeline. Identify the applicable 10-year rule, any annual distribution requirement and the owner’s death-date and RMD status that affect the schedule.
- Compare beneficiary tax years. Estimate when distributions would occur and whether they could coincide with wages, business income, retirement income or other taxable events. Use ranges rather than pretending future tax rates are known.
- Check state and estate consequences separately. The federal rules described here do not establish state income-tax treatment, estate-tax results or trust-administration consequences.
- Document the choice. Keep the conversion confirmation, tax calculation, basis records, beneficiary forms and written instructions for the custodian.
Illustrative situations
Owner with several years of lower income
An owner who has retired, has not yet begun RMDs and expects a relatively low-income year may consider a partial conversion. The potential rationale is to recognize income while the owner’s taxable income is lower than it may be later. The owner still must verify basis, pay the resulting tax and avoid converting an RMD that is already due.
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Owner whose adult child has high earnings
If the likely beneficiary is an adult child with substantial earnings, inherited traditional-IRA distributions could arrive during years when the child’s marginal rate is high. A conversion may shift some tax to the owner, but the owner must compare that immediate cost with the child’s likely withdrawal pattern rather than assuming the child’s rate will always be higher.
Owner whose spouse is the sole beneficiary
A surviving spouse may have the choice to treat the IRA as their own or remain a beneficiary. That flexibility can make leaving the traditional IRA reasonable, particularly when the spouse needs a different distribution timetable. The spouse should obtain advice before retitling the account because the election changes the RMD framework.
Owner with substantial undocumented basis
An owner who made nondeductible contributions but cannot locate Form 8606 should pause. The tax result cannot be evaluated reliably until basis is reconstructed. Converting first and searching for records later can produce an avoidable dispute with the tax return.
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- “Every conversion dollar is taxable.” Basis can make part of a conversion nontaxable. Verify the aggregation calculation.
- “The RMD can be converted.” A required distribution must be taken; it is not converted tax-free.
- “Every heir has ten years and no annual withdrawal.” The 10-year rule applies broadly to many non-EDB beneficiaries, but annual requirements and the exact timetable depend on additional facts.
- “A spouse is treated exactly like an adult child.” A sole surviving spouse generally has owner-versus-beneficiary choices that other beneficiaries do not.
- “A Roth is always tax-free to heirs.” Beneficiary distribution rules and the Roth five-year rules still matter.
- “The federal answer is the whole answer.” State income tax, estate circumstances and trust administration can change the practical result.
- “A conversion can always be undone.” For tax years beginning after December 31, 2017, recharacterization of a Roth conversion generally is not available.
- “The beneficiary form can wait.” An outdated designation can override the intended family plan or create an avoidable estate-administration problem.
How to get professional help efficiently
Bring your tax professional or fiduciary financial planner the records needed to answer the actual comparison: account statements, Forms 8606, prior returns, RMD calculations, conversion proposals, cash available for tax, beneficiary designations and relevant trust or estate documents.
Ask for separate written figures for the owner’s conversion tax and the beneficiary’s projected inherited-account tax. Request the assumptions behind each estimate, including the conversion year, amount, basis, beneficiary category, distribution years and federal versus state treatment. A professional can help apply current IRS guidance, but no source can guarantee future tax rates or an optimal result for every family.
Federal sources and rule updates
The primary references are the IRS’s Publication 590-A for contributions and conversions, Publication 590-B for distributions and beneficiaries, the Required minimum distributions FAQs for owner RMD information, and Retirement topics – Beneficiary for beneficiary categories and inherited-account concepts.
IRS guidance and retirement-law interpretations can change. Check the publication and regulations applicable to the tax year of the conversion and the year of the owner’s death, especially when a beneficiary is subject to a 10-year deadline or possible annual distributions.
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Converting can accelerate tax to the owner’s return while creating a Roth account for beneficiaries; leaving the traditional IRA defers taxable income but can place it on beneficiaries’ returns under rules that may require withdrawals within 10 years and, in some cases, during that period. Decide only after comparing the owner’s current-year tax, basis, RMD status, beneficiary category and likely distribution years under current federal rules. State taxes and individualized estate circumstances require separate advice.
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