Short answer
A 401(k) comes through an employer. An IRA belongs to the individual.
IRS describes 401(k)s as employer plans and IRAs through individual retirement arrangement publications. For 2026, IRS lists the 401(k)-style employee deferral limit at $24,500 and the IRA contribution limit at $7,500, before catch-up details.
Start here
What you actually came to find out
Plain answers first. Sources stay below for checking details.
What is the difference?
A 401(k) comes through work. An IRA is opened outside work. Both can hold retirement money, but the rules differ.
What does it mean?
This is mostly a control question. A 401(k) may offer a match; an IRA may offer more choice.
What does it mean for my money?
Compare match, fees, investment options, taxes, and access. The best container depends on what you are trying to do.
What does it mean for my time?
While working, payroll saving may be easier. In retirement, fewer accounts can be easier to manage.
401(k)
Employer
IRS describes 401(k) plans as employer-sponsored retirement plans.
Source trail: IRS: 401(k) Plans
IRA
Individual
IRS Publication 590-A covers contributions to individual retirement arrangements.
Source trail: IRS: Publication 590-A: Contributions to Individual Retirement Arrangements
2026 limits
$24.5K vs $7.5K
IRS lists separate 2026 contribution limits for 401(k)-style plans and IRAs.
Source trail: IRS: 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500
Withdrawals
Rule set
IRS Publication 590-B covers IRA distributions, and RMD FAQs cover required withdrawals.
Source trail: IRS: Publication 590-B: Distributions from Individual Retirement Arrangements, IRS: Required Minimum Distributions FAQs
A neutral comparison asks where the account comes from, how much can go in, what tax treatment applies, and what rules appear when money comes out.
Neutral landscape
The shape of the question
A 401(k) is tied to an employer plan. IRS 401(k) guidance explains elective deferrals and plan structure.
Source trail: IRS: 401(k) Plans
An IRA is an individual retirement arrangement. IRS Publication 590-A covers contribution rules and IRS Publication 590-B covers distributions.
Source trail: IRS: Publication 590-A: Contributions to Individual Retirement Arrangements, IRS: Publication 590-B: Distributions from Individual Retirement Arrangements
Contribution limits differ. IRS lists the 2026 employee deferral limit at $24,500 for 401(k)-style plans and the 2026 IRA contribution limit at $7,500.
Source trail: IRS: 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500
Deductibility can be its own question. IRS deduction limits explain how income and workplace plan coverage can affect traditional IRA deductions.
Source trail: IRS: IRA Deduction Limits
Curator core
What the authorities say
These sources are here for the reader who wants to check the work. The plain-English answer stays above them.
Source 01
IRS
401(k) Plans
The IRS page explains how 401(k) plans work, including elective deferrals, plan rules, and tax treatment.
Source framing
IRS frames a 401(k) as an employer-sponsored retirement plan with tax rules set by the Internal Revenue Code.
Strongest for: official 401(k) plan rules and vocabulary
Read at IRSSource 02
IRS
Publication 590-A: Contributions to Individual Retirement Arrangements
Publication 590-A is the IRS source for IRA contribution rules, nondeductible contributions, and reporting.
Source framing
IRS Publication 590-A covers traditional and Roth IRA contribution mechanics.
Strongest for: IRA contribution details and nondeductible IRA context
Read at IRSSource 03
IRS
Publication 590-B: Distributions from Individual Retirement Arrangements
Publication 590-B is the IRS source for IRA distributions, Roth ordering rules, and required minimum distributions.
Source framing
IRS Publication 590-B explains distribution rules that matter after money leaves an IRA.
Strongest for: RMDs, Roth distribution rules, and IRA withdrawals
Read at IRSSource 04
IRS
401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500
The IRS release gives 2026 401(k), IRA, catch-up, Roth IRA income phase-out, and related retirement-plan limits.
Source framing
IRS publishes the 2026 retirement contribution limits and Roth IRA income phase-out ranges.
Strongest for: 2026 retirement account contribution and Roth income limits
Read at IRSSource 05
IRS
Retirement Topics: Contributions
The IRS contribution topic is the primary source for contribution limits and catch-up contribution rules.
Source framing
IRS publishes the annual contribution limits that shape how much can go into retirement accounts each year.
Strongest for: current contribution limits and catch-up rules
Read at IRSSource 06
IRS
IRA Deduction Limits
The IRS deduction limits page explains when traditional IRA deductions phase down or disappear.
Source framing
IRS ties traditional IRA deductibility to income, filing status, and workplace retirement plan coverage.
Strongest for: traditional IRA deduction limits
Read at IRSSource 07
IRS
Required Minimum Distributions FAQs
The IRS RMD FAQ explains which accounts have required withdrawals and when the first withdrawal generally begins.
Source framing
IRS says required minimum distributions apply to many retirement accounts, with Roth IRAs treated differently during the original owner lifetime.
Strongest for: official RMD age and account rules
Read at IRSPlain-English forks
The forks people face
Most retirement questions hide a few smaller decisions. These are the practical pieces that change the plan.
Does the person have a workplace plan?
Why it matters: A 401(k) depends on employer access, while an IRA can be opened separately if eligibility rules are met.
In real life: This can make the same claiming age feel different for someone still earning a paycheck.
What to look at: Use IRS 401(k) and Publication 590-A.
Which has the larger contribution limit?
Why it matters: Employer plans and IRAs use different annual limits. In 2026, the headline limits are $24,500 for 401(k)-style employee deferrals and $7,500 for IRAs.
In real life: This is one of the places where the same question can lead to a different map for two otherwise similar households.
What to look at: Use IRS 2026 retirement limits.
Is the IRA deduction allowed?
Why it matters: Traditional IRA deductibility can phase down with income and workplace plan coverage.
In real life: This can make the same claiming age feel different for someone still earning a paycheck.
What to look at: Use IRS deduction limits.
What happens at withdrawal?
Why it matters: Distribution and RMD rules can matter more than the account label later.
In real life: This changes the gap between money in an account and money the household can actually spend.
What to look at: Use IRS Publication 590-B and RMD FAQs.
Common questions
Quick answers
Short, plain answers for the questions people usually have next. The source trail stays available below.
Can someone have both a 401(k) and an IRA?+
IRS rules allow different retirement account types, but contribution limits, deductibility, and eligibility rules still apply. For 2026, the 401(k)-style employee limit and IRA limit are separate numbers.
Is an IRA always deductible?+
No. IRS deduction limits depend on income, filing status, and workplace retirement plan coverage.
Does a 401(k) always have a match?+
No. A match is an employer plan feature. IRS explains the plan type, but plan documents describe the actual employer match.
Do both account types have RMDs?+
IRS RMD rules apply to many retirement accounts. Roth IRA treatment during the original owner lifetime differs under IRS rules.
Can a 401(k) become an IRA?+
Rollovers can move retirement money between eligible accounts, but IRS publications and plan rules govern the details.
Which account matters most for retirement planning?+
The account label matters less than spending, taxes, income, withdrawal timing, and the household full map.
How this page is curated
The Retirement Atlas does not give financial advice. This page curates named sources selected for authority, clarity, and usefulness. Every source is linked, and pages are reviewed quarterly and any time SSA, IRS, or CMS publish a change that affects the topic.
Read the planner methodologyTrust anchor
Sources used on this page
Every source named above is listed here in one place.
IRS. 401(k) Plans
https://www.irs.gov/retirement-plans/401k-plansIRS. Publication 590-A: Contributions to Individual Retirement Arrangements
https://www.irs.gov/publications/p590aIRS. Publication 590-B: Distributions from Individual Retirement Arrangements
https://www.irs.gov/publications/p590bIRS. 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500
https://www.irs.gov/newsroom/401k-limit-increases-to-24500-for-2026-ira-limit-increases-to-7500IRS. Retirement Topics: Contributions
https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-contributionsIRS. IRA Deduction Limits
https://www.irs.gov/retirement-plans/ira-deduction-limitsIRS. Required Minimum Distributions FAQs
https://www.irs.gov/retirement-plans/retirement-plan-and-ira-required-minimum-distributions-faqs
Before you act on this
This plan is educational. It is not personalized financial, tax, or insurance advice. Projections illustrate the math, they do not predict the future. Talk to your own licensed financial professional before acting on any of it.