How Should an Inherited Roth IRA Fit Into Your Own Roth Conversion Plan?
You have been considering Roth conversions from your own traditional IRA when a parent leaves you a Roth IRA. The inheritance brings another source of retirement money and a new question: should you convert more because you can afford the tax, or less because you already have more Roth assets?
Either answer could fit. Start by giving the inherited account and your own IRA distinct jobs. The inheritance can change how you fund spending and taxes, while the reason to convert your own money still depends on your retirement needs and future tax picture.
Which inheritance rules apply first?
This discussion focuses on a non-spouse individual beneficiary subject to the ten-year rule after an owner’s death in 2020 or later. The account generally must be emptied by December 31 of the tenth year following the death. Spouses, certain other eligible beneficiaries, trusts, and estates need a different review. [1]
Confirm whether withdrawals are qualified before treating the entire balance as tax-free spending money. An inherited Roth has a five-tax-year qualification period tied to the deceased owner’s Roth history. That period is separate from the one for your own Roth IRA; unqualified earnings can remain taxable. [2]
You also cannot roll a nonspouse inherited IRA into your own IRA. Keep the inherited Roth properly titled and separate, and coordinate its withdrawals with your other accounts. [3]
Should you leave the inherited Roth untouched?
Under the ten-year rule described here, an inherited Roth generally has no annual required distributions in years one through nine. You may leave the money invested until the final deadline, although you must then withdraw the entire balance. That can create a period of continued tax-free growth if distributions are qualified. [4]
Preserving that opportunity can be sensible when other assets comfortably fund your life. It is still a choice with a tradeoff. Leaving every inherited dollar untouched may require larger taxable withdrawals from your own IRA to cover spending in years when you hoped to make conversions.
How can the inheritance support a conversion?
A conversion of your own previously untaxed IRA money creates taxable income. A qualified inherited Roth withdrawal does not offset that income or make the conversion tax-free. The two transactions need separate treatment even when they support the same plan. [5]
One approach uses inherited Roth withdrawals for spending that would otherwise require optional withdrawals from your traditional IRA. That can leave room in your taxable-income plan for a conversion instead. The comparison must hold spending constant and include the conversion tax.
Another approach uses inherited Roth withdrawals to pay the conversion tax itself. That may solve the funding problem, but it consumes money already eligible for tax-free treatment. You are exchanging some inherited Roth resources for the potential benefit of converting your own IRA.
One inheritance, two possible uses
Use qualified withdrawals for spending
Inherited account supplies cash
Inherited Roth → retirement spending.
Your own account has a separate transaction
Your traditional IRA → your Roth IRA, if a conversion fits.
Use qualified withdrawals for conversion tax
Inherited account supplies cash
Inherited Roth → cash to pay the tax.
Your own account has a separate transaction
Your traditional IRA → your Roth IRA; the conversion still creates taxable income.
Neither route rolls the inherited Roth into your own Roth or deducts its withdrawal from conversion income.
Dovetail Principle: Financial Decisions Need to Fit Together
The inherited account’s deadline, your spending, and your own conversion decision belong in one plan. Coordinating them can create choices that are hard to see when you manage each account separately.
What comparison tells you whether it helps?
Compare preserving the inherited Roth with using a portion during selected conversion years. Keep retirement spending and investment assumptions consistent. Count the inherited balance remaining, your own retirement accounts, other savings, and taxes paid through the same future date.
Conversion research demonstrates that funding source and time horizon can change the result. That research does not establish that spending an inherited Roth to fund a conversion is automatically beneficial. Here, the lost opportunity to keep inherited money growing tax-free also belongs in the comparison. [6]
Give your own future tax situation equal attention. A conversion may help if it reduces later taxable withdrawals when your tax cost is expected to be higher. If your own future rate is likely lower, or you need the inheritance for near-term care or other priorities, paying conversion tax now may be less attractive.
Required distributions from your own IRA remain a separate obligation and cannot be converted. Do not treat inherited cash as a way to bypass that requirement. Your tax professional should distinguish required distributions, optional spending withdrawals, and proposed conversions. [5]
What should change in your plan?
Set a withdrawal plan for the inherited Roth through its deadline, then reconsider the size and timing of your own conversions. You may preserve the inheritance, use a portion to support selected conversion years, or reduce conversions because your need for additional Roth assets has changed.
Choose the combination that supports your spending and improves the overall after-tax plan. The inherited Roth gives you more choices. Its arrival alone does not tell you how much to convert.
For the different tradeoff involving taxable inherited withdrawals, read Should You Spend From an Inherited IRA Before Your Own Retirement Accounts?.
deadline with your own IRA plan before changing how much you convert.
