What is the difference between a 401(k) and an IRA?

An IRA is a tax-advantaged US retirement savings account, and a Roth IRA makes qualified withdrawals and growth tax-free instead of giving a tax break on contributions.

Updated 1 hour ago3 min readVersion 2

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Covers: This page compares 401(k) plans and individual retirement accounts (IRAs) in the United States, covering contribution limits, tax treatment, employer matching, investment options, eligibility, and withdrawal rules. It does not cover non-US retirement systems or specific plan providers.

Also answers: Difference between 401k and IRA · Which is better 401k or IRA? · 401k and IRA comparison

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The short answer

Evidence-backed AI-prepared starting map

An individual retirement account (IRA) is a US retirement savings plan offered by many financial institutions that provides tax advantages for retirement savings; it is a trust holding investment assets bought with a taxpayer's earned income for their eventual benefit in old age, and is one type of "individual retirement arrangement" described in IRS Publication 590 (alongside individual retirement annuities and employer-established benefit trusts). A Roth IRA is an IRA that is generally not taxed upon distribution if certain conditions are met: instead of an income tax reduction for contributions, qualified withdrawals are tax-free and account growth is tax-free. The Roth IRA was introduced in the Taxpayer Relief Act of 1997 and is named for Senator William Roth.1 2

Still uncertain: The sources gathered so far describe IRAs and Roth IRAs but do not yet lay out 401(k) plan mechanics, so a direct side-by-side comparison of contribution limits, employer matching, investment menus, eligibility, and withdrawal rules is not yet supported by the evidence on this page. The Roth IRA description notes that tax-free treatment applies only "provided certain conditions are met," but the specific conditions (such as holding periods or age thresholds) are not detailed in the available material. The personal-finance article for plastic surgery trainees discusses retirement planning as a topic area but does not state specific 401(k) or IRA rules, figures, or comparisons. No reader contributions have been added yet, so there is no experience layer or participant preference data to draw on.

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In brief

An IRA is a tax-advantaged US retirement savings account offered by financial institutions, structured as a trust holding assets bought with earned income for the saver's later benefit.1
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A Roth IRA flips the usual tax timing: contributions don't get an income tax reduction, but qualified withdrawals and account growth are tax-free when conditions are met.2
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The Roth IRA was created by the Taxpayer Relief Act of 1997 and named for Senator William Roth.2
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Retirement planning is one of several personal-finance topics that early-career surgeons are often expected to navigate without formal training, alongside debt management, insurance, and contract negotiation.3
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At a glance

What this page stands on

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The evidence behind it

3 sources

Other studies and data1
Background2

Published in 2026

Sources on this page by kind and year
Source	Kind	Year
Individual retirement account (Wikipedia)	Background	Unknown
Roth IRA (Wikipedia)	Background	Unknown
From Residency to Retirement: An Overview of Personal Finance for Plastic Surgery Trainees.	Other studies and data	2026

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What it means for you

Which fits you?

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If you are choosing between a traditional-style account and a Roth-style account

the key structural difference to weigh is tax timing: Roth accounts forgo a contribution-time income tax reduction in exchange for tax-free qualified withdrawals and tax-free growth, while the sources here describe other tax-advantaged plans as granting an income tax reduction for contributions.2

Evidence-backed

If you are an early-career physician or trainee planning your finances

retirement planning is one of the core topics to address alongside student loan and debt management, early saving and investment strategies, and insurance and risk protection, according to a personal-finance overview written for plastic surgery trainees and early practice surgeons.3

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The full story · 3 chapters

What an IRA is

AI summary:An IRA is a tax-advantaged US retirement savings plan, structured as a trust holding assets bought with earned income for the saver's old age.

Evidence-backed

Evidence-backed: An individual retirement account (IRA) in the United States is a type of retirement savings plan offered by many financial institutions that provides tax advantages for retirement savings. It is structured as a trust that holds investment assets purchased with a taxpayer's earned income for the taxpayer's eventual benefit in old age. The IRA is one form of "individual retirement arrangement" as described in IRS Publication 590, Individual Retirement Arrangements (IRAs); other arrangements in that category include individual retirement annuities and employer-established benefit trusts.1

Roth IRAs and how their tax treatment differs

AI summary:A Roth IRA shifts the tax benefit to withdrawal time: qualified withdrawals and account growth are tax-free, and it dates to the Taxpayer Relief Act of 1997.

Evidence-backed

Evidence-backed: A Roth IRA is an IRA under US law that is generally not taxed upon distribution, provided certain conditions are met. The principal difference between Roth IRAs and most other tax-advantaged retirement plans is the timing of the tax benefit: rather than granting an income tax reduction for contributions to the plan, qualified withdrawals from the Roth IRA are tax-free, and growth in the account is also tax-free. The Roth IRA was introduced as part of the Taxpayer Relief Act of 1997 and is named for Senator William Roth.2

Retirement planning in early-career context

AI summary:A personal-finance overview for plastic surgery trainees and early-career surgeons says residency programs rarely teach personal finance, covering debt, saving, insurance, and retirement.

Evidence-backed

Evidence-backed: A personal-finance overview aimed at plastic surgery trainees and early-career surgeons notes that most residency programs lack personal finance education, leaving trainees inadequately prepared to manage student loans, negotiate employment contracts, or participate in long-term financial planning. The article covers student loan and debt management, early saving and investment strategies, insurance and risk protection, and retirement planning, and it argues that improving financial literacy at the trainee level is critical for physician well-being and professional development. It does not, in the material available here, state specific 401(k) or IRA rules or compare the two account types.3

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An IRA is a tax-advantaged US retirement savings account offered by financial institutions, structured as a trust holding assets bought with earned income for the saver's later benefit.
A Roth IRA flips the usual tax timing: contributions don't get an income tax reduction, but qualified withdrawals and account growth are tax-free when conditions are met.
The Roth IRA was created by the Taxpayer Relief Act of 1997 and named for Senator William Roth.

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Not read yet: 3. Retirement planning in early-career context

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1
Individual retirement account (Wikipedia)
WikipediaPublished Sep 29, 2026Checked Oct 11, 2026
“An individual retirement account (IRA) in the United States is a type of retirement savings plan offered by many financial institutions that provides tax advantages for retirement savings. It is a trust that holds investment assets purchased with a taxpayer's earned income for the taxpayer's eventual benefit in old age. An individual retirement account is a type of individual retirement arrangement as described in IRS Publication 590, Individual Retirement Arrangements (IRAs). Other arrangements include individual retirement annuities and employer-established benefit trusts.”
2
Roth IRA (Wikipedia)
WikipediaPublished Oct 1, 2026Checked Oct 11, 2026
“A Roth IRA is an individual retirement account (IRA) under United States law that is generally not taxed upon distribution, provided certain conditions are met. The principal difference between Roth IRAs and most other tax-advantaged retirement plans is that rather than granting an income tax reduction for contributions to the retirement plan, qualified withdrawals from the Roth IRA plan are tax-free, and growth in the account is tax-free. The Roth IRA was introduced as part of the Taxpayer Relief Act of 1997 and is named for Senator William Roth.”
3
From Residency to Retirement: An Overview of Personal Finance for Plastic Surgery Trainees.
Plastic and reconstructive surgery. Global open (Zeitouni et al.)Published Sep 3, 2026Checked Oct 11, 2026
“Yet, most residency programs lack personal finance education, leaving trainees inadequately prepared to manage student loans, negotiate employment contracts, or participate in long-term financial planning. This article aims to bridge this educational gap by providing a concise overview of essential financial principles tailored to plastic surgery trainees and early practice surgeons. Key topics addressed include student loan and debt management, early saving and investment strategies, insurance and risk protection, and retirement planning. Practical considerations for career transitions include implications of different employment models, insurance considerations, and contract negotiation. Additional focus is placed on career-stage considerations, such as financial advisor selection. Improving financial literacy at the trainee level is critical for physician well-being and professional development. By offering actionable recommendations, trainees and early-career surgeons will be better equipped with the skills necessary to build a financially secure and successful future.”

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“What an IRA is” rests on one independent source
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“Roth IRAs and how their tax treatment differs” rests on one independent source
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“Retirement planning in early-career context” rests on one independent source
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Open questions

What are the defining features of a 401(k) plan — how it is established by an employer, how contributions and withdrawals are taxed, and how it differs structurally from an IRA?
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What are the current annual contribution limits for 401(k) plans and for traditional and Roth IRAs, and how do catch-up contributions for older savers work?
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How does employer matching work in a 401(k), and what does it mean for the effective return on contributions compared with an IRA?
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What specific conditions must be met for Roth IRA withdrawals and growth to be tax-free, such as holding periods and age thresholds?
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When and how can funds be moved between a 401(k) and an IRA, and what are the tax consequences of each direction?
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