How Are Retirement Accounts Taxed?

How retirement accounts are taxed is one of the most consequential — and most widely misunderstood — dimensions of retirement income planning. Most people know that taxes apply to retirement accounts in some form. Far fewer understand that the timing of taxation, the rate at which withdrawals are taxed, and the conditions under which tax obligations arise vary dramatically across the retirement account types that most Americans hold. Getting this distinction wrong — assuming all retirement income is taxed the same way, or failing to plan around the tax obligations that different accounts generate — can produce retirement tax bills that are significantly larger than they need to be and income streams that are materially less than the account balances would suggest.

The foundational concept in retirement account taxation is the distinction between accounts that receive a tax benefit on contributions and accounts that receive a tax benefit on withdrawals — a distinction that the IRS refers to as pre-tax and after-tax treatment. Pre-tax contributions reduce taxable income in the year they are made, which means the IRS defers its claim on that money until withdrawal — when the full amount including all growth is taxed as ordinary income. After-tax contributions generate no deduction in the contribution year, but they build a tax-free withdrawal right on the contributed principal — and in qualified accounts, on the investment growth as well. Understanding which accounts fall into which category, and when the tax obligation attaches, is the starting point for retirement tax planning that actually works.

At Diversified Insurance Brokers, we work with clients approaching and in retirement to coordinate their account withdrawal strategy around their tax situation — because the order in which retirement accounts are accessed, and the timing of those withdrawals relative to Social Security, pension income, and required minimum distributions, can meaningfully affect the total taxes paid over a retirement lifetime.

The Tax Treatment of Every Major Retirement Account Type

The chart below summarizes how the most common retirement account types are taxed at the contribution, growth, and withdrawal stages — the three moments when the IRS has an interest in retirement savings. Understanding all three stages for each account type is essential for planning withdrawals in a tax-efficient sequence.

Pre-Tax Accounts — Deferring the Tax Bill Until Retirement

Traditional 401(k) plans, 403(b) plans, governmental 457(b) plans, traditional IRAs, SEP IRAs, and SIMPLE IRAs all share the same fundamental tax structure: contributions are made before federal income tax is applied, reducing taxable income in the contribution year, and withdrawals in retirement are fully taxable as ordinary income. Every dollar that comes out of a pre-tax account — both the original contribution and all the investment growth accumulated over the years — is taxed at whatever ordinary income tax rate applies to the retiree’s income in the year of withdrawal.

This structure creates a meaningful planning requirement: the pre-tax account balance visible on a statement does not represent the retiree’s net spendable wealth. It represents a gross figure from which the IRS’s share has not yet been taken. A retiree with $800,000 in a traditional 401(k) does not have $800,000 of retirement wealth — they have $800,000 minus whatever income taxes their withdrawals will generate at their marginal rate in retirement. If that retiree’s combined income from Social Security, pension, and 401(k) withdrawals places them in the 22% federal bracket, each dollar they withdraw from the 401(k) produces only 78 cents of after-tax income. Understanding this distinction is essential for realistic retirement income planning. For a deeper look at how annuity income — another common retirement income source — is taxed within these frameworks, our resource on how qualified annuities are taxed covers the interaction between annuity distributions and retirement tax rates in detail.

Required Minimum Distributions — The IRS’s Mandatory Timeline

Pre-tax retirement accounts do not allow indefinite tax deferral. The IRS requires account holders to begin taking minimum annual withdrawals — called required minimum distributions, or RMDs — starting at age 73 under current law. RMDs are calculated each year based on the prior December 31 account balance and a life expectancy factor from IRS tables. The RMD amount must be withdrawn and added to taxable income regardless of whether the retiree needs or wants the money — and failure to take the full RMD results in a 25% excise tax on the amount that should have been withdrawn.

For retirees with large pre-tax account balances, RMDs can produce significant mandatory taxable income that, when combined with Social Security benefits and any other retirement income, pushes the effective tax rate substantially higher than anticipated. A retiree with $1.2 million in a traditional IRA at age 73 may face an RMD of approximately $45,000 in the first year — income that is entirely taxable at ordinary rates and that interacts with Social Security taxation thresholds in ways that amplify the tax impact. Planning around RMDs — including Roth conversion strategies in the years before RMDs begin — is one of the most financially significant planning opportunities available to pre-retirees with large tax-deferred balances. Our resource on how to protect your funds in retirement discusses RMD planning as part of a comprehensive retirement income protection strategy.

Roth Accounts — Tax-Free Growth and Withdrawal

Roth IRAs, Roth 401(k)s, Roth 403(b)s, and Roth 457(b)s all share the opposite tax structure from their traditional counterparts: contributions are made with after-tax dollars — generating no deduction in the contribution year — but qualified withdrawals of both contributions and investment growth are entirely tax-free. A Roth IRA that grows from $100,000 to $400,000 over 25 years produces $300,000 of tax-free investment growth that the IRS has no claim on at withdrawal, as long as the account is at least five years old and the account holder is at least 59½.

The tax-free withdrawal advantage of Roth accounts makes them particularly valuable for two types of retirement planning situations. The first is for savers who expect to be in a higher tax bracket in retirement than they are today — whether because their income will be higher, because tax rates will be higher, or both. The second is for estate planning purposes: Roth IRAs are not subject to required minimum distributions during the original owner’s lifetime, making them the most efficient retirement account type for passing wealth to heirs while managing the original owner’s taxable income. This estate and wealth transfer advantage of Roth accounts connects directly to broader planning for wealth transfer strategies that protect heirs by keeping inherited assets out of high ordinary income tax brackets.

The Social Security Interaction — How Retirement Income Affects Benefit Taxation

One of the most impactful and least anticipated retirement tax interactions is the effect of retirement account withdrawals on Social Security benefit taxation. Social Security benefits are not automatically taxable — they become partially taxable when a retiree’s combined income exceeds certain thresholds. Combined income for this purpose is defined as adjusted gross income plus non-taxable interest plus one-half of Social Security benefits. When combined income exceeds $25,000 for single filers or $32,000 for married filing jointly, up to 50% of Social Security benefits become taxable. When combined income exceeds $34,000 for single filers or $44,000 for married filing jointly, up to 85% of benefits become taxable.

The practical consequence is that each dollar of taxable pre-tax account withdrawal — from a traditional IRA or 401(k) — does not merely consume the marginal income tax rate on that dollar. It also potentially triggers taxation on Social Security benefits that would otherwise be tax-free, creating a compounding tax effect that is sometimes called the Social Security tax torpedo. A retiree who carefully withdraws just enough to stay below the taxation threshold on their Social Security benefit may be making one of the most financially efficient retirement income decisions available to them. Our comprehensive resource on how Social Security is taxed explains these income thresholds and the interaction with retirement account withdrawals in complete detail, and our broader guide on Social Security planning decisions covers how withdrawal sequencing affects Social Security optimization.

Taxable Brokerage Accounts — Capital Gains vs. Ordinary Income

Taxable brokerage and investment accounts — sometimes called non-qualified accounts — operate under a different tax framework from retirement accounts. Contributions are always made with after-tax dollars. Income generated within the account — interest, dividends, and realized capital gains from selling positions — is taxed in the year it is generated, with the rate depending on the type of income. Interest and short-term capital gains from assets held less than one year are taxed as ordinary income at the account holder’s marginal rate. Qualified dividends and long-term capital gains from assets held more than one year are taxed at the preferential capital gains rates — 0%, 15%, or 20% depending on income level — which are substantially lower than ordinary income tax rates for most retirees.

For retirees, taxable accounts are often the most flexible income source — withdrawals can be timed and sized with great flexibility, unrealized gains can be deferred indefinitely by not selling, and tax-loss harvesting strategies can offset realized gains with losses from other positions. The step-up in cost basis that occurs at death also makes taxable account assets valuable for estate planning, since heirs who inherit these assets receive a new cost basis at the fair market value at the date of death, eliminating any capital gains tax on growth that occurred during the original owner’s lifetime. For retirement investors seeking stable income from taxable accounts without equity volatility, our resource on fixed income investment options covers the tax treatment of various fixed income instruments in retirement planning contexts.

Non-Qualified Annuities — LIFO Taxation and Deferral

Non-qualified annuities — annuities purchased with after-tax dollars outside of any IRA or employer plan — have a distinct and often misunderstood tax treatment. The principal contributed to a non-qualified annuity — the original after-tax investment — is not taxed again when withdrawn, because it was purchased with money on which taxes were already paid. However, the growth accumulated inside the annuity — the interest, index credits, or investment earnings — is taxed as ordinary income when withdrawn, and it is taxed under a last-in-first-out (LIFO) rule: earnings come out first before any tax-free return of principal begins.

This LIFO taxation structure means that systematic withdrawals from a non-qualified annuity are fully taxable as ordinary income until all accumulated earnings have been distributed — only then does the tax-free return of original principal begin. For annuity owners planning retirement income distributions, this timing dynamic has important implications for sequencing withdrawals alongside other income sources and managing marginal tax rates across retirement years. Our comprehensive resources on how non-qualified annuities are taxed and on qualified annuity taxation cover both scenarios in complete detail — including how annuitization changes the tax treatment and how the exclusion ratio affects the taxable portion of annuity income payments.

Health Savings Accounts — The Triple Tax Advantage

Health Savings Accounts occupy a unique position in the retirement tax landscape because they offer three distinct tax benefits that no other account type provides simultaneously: contributions are pre-tax or tax-deductible, reducing taxable income in the contribution year; growth inside the account is tax-free; and withdrawals for qualified medical expenses are also tax-free. This triple tax advantage makes the HSA the most tax-efficient savings vehicle available for healthcare costs — and in retirement, where medical expenses are often among the largest spending categories, a well-funded HSA can provide substantial tax-free income for the expenses that dominate retirement budgets.

After age 65, HSA funds withdrawn for non-medical purposes are simply taxed as ordinary income — identical treatment to a traditional IRA withdrawal — with no additional penalty. This means that an HSA funded during working years effectively becomes a secondary traditional IRA for non-medical expenses after 65 while remaining a tax-free spending account for medical costs. The HSA’s triple tax advantage and its role in retirement medical expense planning are important components of the broader downside protection planning that comprehensive retirement income strategies require.

The Withdrawal Sequencing Strategy — Which Accounts to Draw First

Understanding how each account type is taxed creates the foundation for the most consequential retirement income planning decision: which accounts to draw from first, and in what combination, to minimize total taxes paid over the retirement lifetime. The conventional wisdom — spend taxable accounts first, then pre-tax, then Roth last — is a useful starting framework but rarely the optimal strategy for every individual situation. Actual optimal sequencing depends on current and projected future tax brackets, Social Security timing, RMD projections, state taxes, legacy goals, and the specific account balances involved.

A coordinated withdrawal strategy might draw from pre-tax accounts up to the top of a specific tax bracket, fill the remaining income need from tax-free Roth accounts, and preserve taxable brokerage accounts for flexibility and estate planning. Or it might prioritize Roth conversions in lower-income years before Social Security begins, strategically filling the current lower brackets with conversions that will reduce future RMDs and the RMD-driven tax bills they would otherwise generate. For retirees exploring how annuity income fits within this coordinated withdrawal framework, our resource on the best way to use an annuity in retirement planning explains how guaranteed income sources interact with the withdrawal sequencing decision. And for those assessing their full retirement account picture, our retirement account locator tool helps inventory all retirement assets as the foundation for sequencing analysis. For quantifying risk tolerance across investment accounts, our investment risk calculator provides useful baseline assessment.

State Taxes on Retirement Income

Federal tax treatment is only part of the retirement account taxation picture — state income taxes add another layer of complexity that varies enormously across jurisdictions. Some states exempt all Social Security benefits from state income tax. Others exempt pension income, military retirement income, or retirement account distributions up to specific dollar thresholds. A few states have no income tax at all. And some states tax virtually all retirement income at the same rates as regular earned income, providing no retirement-specific relief.

For retirees with the flexibility to choose where they live in retirement — or who are considering relocation — the state tax treatment of retirement income is a financially material planning consideration that can be worth tens of thousands of dollars over a retirement lifetime. The interaction between federal and state tax obligations on retirement account withdrawals is one reason why retirement income planning benefit significantly from professional review rather than relying solely on general rules. Our guide on how smart investors manage risk without sacrificing growth addresses tax efficiency as a core dimension of retirement investment strategy, alongside the market risk management considerations that affect retirement income sustainability.

Putting It Together — Coordinating Taxes Across a Retirement Income Plan

The tax treatment of retirement accounts is not an isolated planning concern — it is deeply interconnected with Social Security timing, Medicare premium calculations, estate planning, charitable giving strategies, and the sustainability of the overall retirement income plan. A retiree who optimizes each piece in isolation may produce a plan that is individually rational at each decision point but suboptimal in the aggregate. Coordination across all income sources and account types — with taxes as a guiding organizing principle — is the hallmark of genuinely sophisticated retirement income planning.

Social Security disability considerations, including how disability affects retirement benefit calculations, are addressed in our resource on how Social Security disability impacts retirement benefits. Government employees and others subject to Social Security offsets should review our Windfall Elimination Provision guide for how this rule affects Social Security benefit calculations for those with pension income. For current fixed annuity rates that may be relevant to income planning alongside retirement accounts, our current fixed annuity rates page provides up-to-date market data, and our resource on best MYGA annuity rates covers multi-year guaranteed annuity options for tax-deferred growth. For those evaluating whether annuities belong in their retirement plan at all, our comprehensive resource on whether annuities are worth it provides the balanced analysis that the question deserves.