Can I Invest in an IRA and 401(k)? Limits, Deductions, and Deadlines

Yes, you can contribute to both a 401(k) and an IRA in the same year. The IRS treats them as separate accounts with separate annual limits, and participating in your employer’s plan does not shut you out of a personal IRA.¹ The questions that actually decide what you can do are how much fits in each account, whether your Traditional IRA contribution will be tax-deductible, and whether your income lets you use a Roth IRA at all.

How Much You Can Contribute in 2026

Each account carries its own cap, and the IRS adjusts them for inflation most years. For the 2026 tax year:

401(k) employee deferrals: $24,500. This covers what you direct from your paycheck, whether you choose pre-tax or Roth 401(k) treatment.²
IRA contributions: $7,500. This is a combined cap across all your Traditional and Roth IRAs, not $7,500 for each.¹

Employer matching does not count against your $24,500 deferral limit. It sits in a separate bucket alongside your own contributions.

Extra Room if You Are 50 or Older

If you reach age 50 by the end of 2026, you can contribute above the standard limits:

401(k) catch-up at 50 and older: an extra $8,000, for a personal deferral ceiling of $32,500.²
401(k) super catch-up at ages 60 through 63: under SECURE 2.0, this narrow age band gets $11,250 instead of $8,000, for a total deferral limit of $35,750.²
IRA catch-up at 50 and older: an extra $1,100, for a ceiling of $8,600. SECURE 2.0 indexed this figure for inflation starting in 2024, so it has drifted up from the flat $1,000 that applied for years.²

A 62-year-old maxing everything in 2026 could put $35,750 into a 401(k) and $8,600 into IRAs. That is $44,350 in personal contributions before any employer money.

Will Your Traditional IRA Contribution Be Deductible?

Having a 401(k) never blocks you from contributing to a Traditional IRA, but it can block the deduction. Whether you count as an “active participant” in a workplace plan is shown by Box 13 on your W-2; if the retirement plan box is checked, the phase-out rules apply to you.³ Roth 401(k) deferrals still count as active participation for this purpose.⁴

The deduction phases out based on your modified adjusted gross income and filing status.⁵ For 2026, the ranges are:

Single or head of household covered by a workplace plan: $81,000 to $91,000. Below $81,000 the full deduction is available; above $91,000 none of it is deductible.²
Married filing jointly, contributor is covered: $129,000 to $149,000.²
Married filing jointly, contributor is NOT covered but spouse is: $242,000 to $252,000.²
Married filing separately, covered by a workplace plan: $0 to $10,000. This range is not inflation-adjusted, so even a modest income wipes out the deduction.²

Inside the phase-out range, the deductible amount drops proportionally. Above the upper threshold your contribution becomes nondeductible: the money still goes in, you just do not get a tax break upfront.⁶ That nondeductible contribution is often a stepping stone to a backdoor Roth conversion.

Roth IRA Income Limits

With a Roth IRA, income does not affect a deduction — it controls whether you can contribute at all. Your MAGI decides how much of the $7,500 (or $8,600 with catch-up) you are allowed to put in.⁷

For 2026:

These thresholds shift upward most years, so someone phased out last year may qualify again.

The Backdoor Roth for High Earners

If your income exceeds the Roth limits, the common workaround is the backdoor Roth. Direct Roth contributions carry income limits; converting a Traditional IRA to a Roth does not. The two steps:

Make a nondeductible contribution to a Traditional IRA. There is no income limit on Traditional IRA contributions, only on the deduction.
Convert that Traditional IRA to a Roth. You will owe tax on any gains between contribution and conversion, which is typically negligible if you convert quickly.

Report both the nondeductible contribution and the conversion on IRS Form 8606.⁸ Skipping this form is one of the most common mistakes; without it, the IRS has no record you already paid tax on the contribution, and you risk being taxed on the same money twice.

One trap. If you have any pre-tax money in Traditional, SEP, or SIMPLE IRAs, the IRS will not let you convert only the nondeductible portion. It treats all of your Traditional IRA balances as one pool and taxes any conversion proportionally.⁹ This is the pro-rata rule, and it can wipe out most of the benefit. The clean fix is to roll existing pre-tax IRA money into your 401(k) first, if your plan accepts incoming rollovers, so your Traditional IRA balance sits at zero before you convert.

Deadlines and a Funding Order That Works

The two accounts run on different timelines. 401(k) contributions come out of payroll, so the money must be withheld from a paycheck dated on or before December 31. You cannot write a lump-sum 401(k) check in February for the prior year. To hit $24,500, divide that by your remaining pay periods and set your deferral rate accordingly.

IRA contributions are more flexible. You have until April 15, 2027, to make contributions that count toward 2026.¹⁰ That extra window helps if you want to see your full-year income before choosing between Traditional and Roth. Designate the contribution for the correct tax year when you deposit; most brokerages will ask.

A practical funding order for most people: contribute enough to your 401(k) to capture the full employer match, then fund your IRA up to $7,500, then push your 401(k) deferral back toward $24,500 if cash flow allows. The right choice between Roth and pre-tax depends on your bracket and your plan’s investment menu, but capturing the match first is almost always the correct starting point.

Penalties for Going Over

Excess IRA contributions carry a 6% excise tax each year the excess remains in the account past the correction deadline.¹¹ The 6% repeats every year until you fix it. You can avoid the penalty by withdrawing the excess and any earnings on it before your tax filing deadline, including extensions.¹⁰

Excess 401(k) deferrals must be distributed back to you by April 15 of the following year. Miss the deadline and the excess is taxed twice: once in the year of contribution and again when you eventually take a distribution.¹² That April 15 date is firm and does not move if you file a tax extension. This most often catches people who change jobs mid-year and defer into two separate 401(k) plans without adding up the totals.

1
Internal Revenue Service. Retirement Topics – IRA Contribution Limits
2
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
3
Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans
4
Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts
5
Internal Revenue Service. Modified Adjusted Gross Income
6
Office of the Law Revision Counsel. 26 USC 219 – Retirement Savings
7
Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs
8
Internal Revenue Service. About Form 8606, Nondeductible IRAs
9
Internal Revenue Service. Rollovers of After-Tax Contributions in Retirement Plans
10
Internal Revenue Service. IRA Year-End Reminders
11
Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities
12
Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan