401k Calculator & Guide
A 401(k) and an IRA are both tax-advantaged retirement accounts, but they differ in contribution limits, employer involvement, investment choices, tax rules and other features.
Payroll contributions + possible employer contributions
Individually established retirement account
Both account types can be used for retirement savings, but their structures and rules are different.
A 401(k) is an employer-sponsored defined contribution retirement plan. Employees can generally contribute through payroll, and an employer may also make contributions.
You contribute through your employer's retirement plan, generally choosing from the investment options offered by the plan.
One important feature of many 401(k) plans is the possibility of employer contributions, including matching contributions.
An Individual Retirement Arrangement, commonly called an IRA, is an individual retirement account established through a financial institution.
Contributions may be deductible depending on your circumstances, and qualified distributions are generally taxable.
Roth IRA contributions are generally made with after-tax dollars. Qualified withdrawals can be tax-free under applicable rules.
Contribution limits are one of the clearest differences between these account types. The figures below are for tax year 2026.
2026 basic employee elective deferral limit for most 401(k) plans. Catch-up contributions can increase the amount for eligible participants.
2026 combined contribution limit across your traditional and Roth IRAs, subject to the applicable compensation rules.
Employer contributions are a feature of many 401(k) plans, while a standard personal IRA is not an employer-sponsored matching account.
Many employers choose to match some employee contributions, although the formula, limits and vesting requirements vary by plan.
A matching formula is established by the employer's retirement plan.
Employer contributions can be subject to a vesting schedule depending on the plan.
Your own 401(k) contributions are always fully vested, while employer contributions can have different vesting provisions.
A standard individual IRA does not receive employer matching contributions.
Both 401(k)s and IRAs can have traditional and Roth versions, but the eligibility and tax rules differ between account types.
Contributions are generally made on a pre-tax basis and qualified distributions are generally taxable.
Roth 401(k) contributions are generally made with after-tax dollars. Qualified distributions can be tax-free.
Contributions may be deductible depending on income, filing status and other circumstances.
Roth IRA contributions are generally after-tax, and income limits can affect eligibility to contribute.
A Roth 401(k) and Roth IRA both use after-tax contributions, but they have different eligibility and distribution rules.
Income, age, employment status, tax filing status and plan provisions can affect which rules apply.
Investment flexibility is another important distinction. A 401(k) generally offers an investment menu selected for the plan, while an IRA can provide access to investments offered by the financial institution where it is held.
Participants generally choose investments from the options made available through their employer's plan. Those options can include mutual funds, target-date funds, stock funds, bond funds and other permitted investments.
IRAs generally offer a wider range of investment choices, depending on the financial institution and account type. The available choices and costs vary by provider.
Contribution limits are only one part of the comparison. Account costs, investment choices and legal protections can also differ.
A 401(k) can have investment-related, administrative and individual service fees. The actual costs depend on the specific plan.
Understand 401(k) Fees →IRA costs depend on the financial institution, investments and services used. Compare account and investment costs separately rather than looking only at an account label.
Many private-sector 401(k) plans are subject to ERISA, which provides protections and fiduciary requirements that generally do not apply to IRAs in the same way.
An IRA is an individual account established through a financial institution rather than an employer-sponsored retirement plan.
Yes. A person can generally have both types of accounts. Having both does not mean the accounts have identical rules; each account remains subject to its own contribution and tax requirements.
Contribute to your employer's 401(k) according to the plan's rules and available features.
An IRA can provide another tax-advantaged retirement account with its own investment and contribution rules.
Keep track of contribution limits, investments, fees and tax characteristics separately for each account.
Instead of comparing only the account names, review the actual features available to you.
Check whether your 401(k) offers employer contributions and understand the applicable formula.
Compare the applicable annual limits for the account types you use.
Review the actual investments available and their associated costs.
Consider whether the account is traditional or Roth and understand the applicable tax rules.
Compare investment expenses, administrative fees and account-related costs.
Understand withdrawal, rollover and distribution provisions that apply to each account.
Explore the connected 401(k) fundamentals, Roth, contribution and retirement-planning clusters.
Common questions about the differences between 401(k)s and IRAs.
A 401(k) is generally an employer-sponsored retirement plan, while an IRA is an individual retirement account established through a financial institution. Their contribution limits, investment structures and tax rules are different.
Generally, yes. The contribution limits for 401(k) plans and IRAs are separate. However, eligibility and tax-deduction rules can affect IRA contributions, particularly for traditional IRAs.
For 2026, the basic employee elective deferral limit for most 401(k) plans is $24,500, while the combined annual contribution limit for traditional and Roth IRAs is $7,500.
A standard personal IRA is not an employer-sponsored matching account. Employer matching contributions are generally a feature of an employer retirement plan such as a 401(k).
Typically, a 401(k) offers investments from a plan-selected menu, while an IRA can provide a broader range of choices through the financial institution where it is held. The actual choices vary by plan and provider.
In many situations, retirement plan assets can be rolled into an IRA, subject to applicable tax rules and plan requirements. The details can depend on whether you are still employed, the type of account and the type of rollover.
No. Both generally use after-tax contributions, but Roth 401(k) and Roth IRA accounts have different contribution, eligibility, distribution and other tax rules.
There is no universal answer. The relevant comparison depends on the features of your specific 401(k), including employer contributions, investment options, fees and applicable tax rules, as well as the IRA options available to you.
Continue exploring 401k.blog's calculators, contribution guides, Roth resources and retirement-planning tools.
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