Inherited Retirement Accounts

If you've recently inherited a retirement account, you're likely navigating both grief and financial complexity at the same time. This guide walks you through the key decisions ahead — what you're dealing with, what the rules require, and how to think about your options — before you touch a calculator.

What type of account did you inherit?

The first question is what kind of account you're dealing with. The tax treatment and distribution rules are nearly identical across inherited retirement accounts, but there are important distinctions worth understanding upfront.

Inherited IRA (Traditional & Roth)

The most common inherited retirement account. Traditional IRA distributions are taxed as ordinary income. Inherited Roth IRAs still follow the 10-year distribution rule, but qualified distributions are tax-free — making the timing strategy less about tax brackets and more about maximizing tax-free growth.

Inherited 401(k)

Employer-sponsored plans follow the same SECURE Act 10-year rule as IRAs. One unique consideration: if the account holds employer stock, you may be eligible for Net Unrealized Appreciation (NUA) treatment — a strategy that taxes the stock's cost basis as ordinary income but lets the appreciation qualify for lower long-term capital gains rates. This option is permanently forfeited if you roll the 401(k) into an Inherited IRA.

Inherited 403(b)

Found in nonprofits, schools, and hospitals. Distribution rules are identical to inherited 401(k) plans — the 10-year rule applies, and distributions are taxed as ordinary income. Like 401(k)s, these can be rolled into an Inherited IRA for broader investment options, but the rollover is irrevocable.

Inherited 457(b)

Government and some nonprofit employer plans. Same 10-year rule, same ordinary income tax treatment. The unique advantage: 457(b) plans have no 10% early withdrawal penalty, even for beneficiaries under age 59½. For younger inheritors, this can meaningfully affect the optimal timing of distributions — you can take larger distributions in lower-income years without the penalty that would apply to other account types.

Key decision: Roll over or keep the plan?

All inherited employer plans (401k, 403b, 457b) can be rolled into an Inherited IRA for more investment flexibility. But this is irrevocable — you lose NUA treatment for 401(k)s with employer stock, and you lose the 457(b)'s penalty-free early access. Understand what you're giving up before you roll over.

Step-up basis: retirement accounts vs. brokerage

If you inherited a taxable brokerage account, you receive a stepped-up cost basis — the assets are valued at the date of death, and any prior gains are effectively erased for tax purposes. This is one of the most powerful tax benefits in the code.

Inherited retirement accounts do not get this benefit. Distributions from inherited IRAs, 401(k)s, 403(b)s, and 457(b)s are taxed as ordinary income — the full amount, not just the gains. This is why distribution strategy matters: every dollar you take out stacks on top of your existing income and is taxed at your marginal rate.

The SECURE Act 10-year rule

For most non-spouse beneficiaries who inherited after December 31, 2019, the SECURE Act requires the entire account to be emptied by the end of the 10th year following the year of death. This applies to all inherited retirement accounts: IRAs, 401(k)s, 403(b)s, and 457(b)s.

There is no annual minimum distribution requirement — you could take nothing for 9 years and empty the account in year 10. But that's almost never optimal from a tax perspective.

Eligible Designated Beneficiaries (EDBs)

A small group is exempt from the 10-year rule and can still use the old "stretch" IRA approach:

  • Surviving spouses
  • Minor children of the account owner (until they reach majority — then the 10-year clock starts)
  • Disabled or chronically ill individuals
  • Beneficiaries not more than 10 years younger than the deceased

If you fall into one of these categories, the rules are different. The calculators below focus on the 10-year rule for non-spouse, non-EDB beneficiaries.

Distribution strategies: why timing matters

Because inherited retirement account distributions are taxed as ordinary income, when you take distributions matters as much as how much you take. The goal is bracket-leveling: spreading distributions across the 10-year window to stay in lower tax brackets each year, rather than taking large lump sums that push you into higher brackets.

Consider a $500,000 inherited IRA. Taking equal $50,000 annual distributions might seem fair, but if your income varies year to year — a sabbatical, a job change, retirement — you could save thousands by taking more in low-income years and less in high-income years.

This applies equally whether the source is an inherited IRA, 401(k), 403(b), or 457(b). The distribution amount stacks on your other income the same way regardless of account type.

Model your distributions

The IRA Optimizer works for all inherited retirement account types — enter your total inherited balance regardless of account type.

Understanding the tax impact

Every dollar of inherited retirement account distribution stacks on top of your existing income: wages, Social Security, investment income, rental income. This means the effective tax rate on your distributions depends entirely on what other income you have that year.

Two often-overlooked consequences:

  • IRMAA surcharges: If you're on Medicare, high-income years can trigger Income-Related Monthly Adjustment Amounts — premium surcharges that persist for 2 years. A single large distribution can cost you thousands in additional Medicare premiums.
  • Social Security taxation: Distributions count toward provisional income, which can push up to 85% of your Social Security benefits into taxable territory.

For younger beneficiaries inheriting a 457(b), the absence of a 10% early withdrawal penalty opens additional timing flexibility — you can take larger distributions in lower-income years (early career, between jobs) without the penalty hit that would apply to IRA or 401(k) distributions before age 59½.

Compare Roth conversion impact

Reinvesting your distributions

Once you've taken a distribution, the after-tax proceeds need a home. If you're reinvesting in bonds, consider whether tax-exempt municipal bonds might offer a better after-tax yield than taxable bonds at your marginal rate.

The comparison isn't always intuitive — a 4% municipal bond can be worth more than a 5.5% taxable bond depending on your combined federal and state rates. The tax-equivalent yield calculator below does the math.

Check your tax-equivalent yield

What's your real return?

Investment returns are typically quoted as nominal figures — before taxes and inflation. But the money you actually keep is what remains after both. An 8% nominal return might be 5.5% after taxes and 2.5% after inflation. Understanding this gap is essential for planning how your inherited wealth grows (or doesn't) over time.

See your real return after taxes and inflation

Authoritative sources

This guide is for educational purposes. Tax rules change, and your situation has nuances that no calculator can fully capture. Before making decisions, consult a tax professional and review these primary sources: