An elective deferral is the portion of your paycheck you choose to send into an employer-sponsored retirement plan before the money ever reaches your bank account. You pick a percentage of pay or a flat dollar amount, your employer withholds it from each check, and the plan invests it according to your instructions. For 2026, you can defer up to $24,500 across most workplace plans, with additional catch-up amounts available once you turn 50.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
How the Mechanism Works
You make the election through your plan’s enrollment system, and you can generally change the amount for future pay periods whenever you want. The contribution flows directly from payroll into your retirement account and gets invested in the funds you’ve selected from the plan’s menu. Nothing about the money passes through your checking account first.
Your employer reports the deferral on your Form W-2 each year, using codes in Box 12 to identify which type of plan received it.2Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans Code D means 401(k), Code E means 403(b), Code S means SIMPLE IRA, and so on.
One detail worth knowing up front: your own elective deferrals are 100% vested the moment they land in the account.3Internal Revenue Service. Retirement Topics – Vesting That money is yours no matter when you leave the company. Employer contributions can follow a vesting schedule that takes years to complete, but the money you defer from your own paycheck never does.
Plans That Accept Elective Deferrals
The deferral concept works about the same across several plan types, though limits and special rules vary.
401(k) Plans
The most common vehicle in the private sector. Eligible employees choose how much to defer, and many employers add a matching contribution on top. The 2026 standard deferral limit is $24,500.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
403(b) Plans
Used by public schools, universities, and certain tax-exempt organizations. Same $24,500 deferral limit and the same catch-up rules as 401(k) plans.4Internal Revenue Service. Retirement Topics – 403(b) Contribution Limits If you participate in both a 401(k) and a 403(b) through different employers in the same year, your combined deferrals across both plans still cannot exceed $24,500.
457(b) Plans
Available to state and local government employees and some nonprofit workers. The 2026 deferral limit is also $24,500, but 457(b) deferrals do not combine with 401(k) or 403(b) deferrals for the annual cap.4Internal Revenue Service. Retirement Topics – 403(b) Contribution Limits If your employer offers both a 403(b) and a 457(b), you could defer up to $24,500 into each for a combined $49,000.
SIMPLE IRA Plans
Small employers often use the Savings Incentive Match Plan for Employees. Deferral limits are lower: $17,000 for 2026, or $18,100 for certain applicable SIMPLE plans that qualify for enhanced limits under SECURE 2.0.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Traditional vs. Roth Deferrals
Elective deferrals come in two tax flavors, and which one you pick determines when you pay income tax on the money.
With a traditional (pre-tax) deferral, your contribution is subtracted from taxable wages before federal income tax is calculated. A $24,500 deferral reduces your taxable income by $24,500 for the year. You don’t pay income tax on that money until you withdraw it in retirement, at which point the original contributions and all investment growth are taxed as ordinary income.5Internal Revenue Service. Publication 525 – Taxable and Nontaxable Income
With a Roth deferral, the money goes in after you’ve already paid income tax on it. Your current paycheck is smaller, but qualified distributions in retirement are completely tax-free, including all accumulated earnings.6Internal Revenue Service. Retirement Topics – Designated Roth Account To qualify, the distribution must occur at least five years after your first Roth contribution and after you reach age 59½, become disabled, or die.
Unlike Roth IRAs, employer-sponsored Roth 401(k) and 403(b) deferrals have no income limit on who can contribute. High earners who are shut out of direct Roth IRA contributions can still make Roth deferrals through their workplace plan. The practical decision comes down to whether you expect your tax rate to be higher now or later. Early-career workers in lower brackets often lean Roth; workers in peak earning years often prefer the current-year deduction from traditional deferrals.
Payroll Taxes Still Apply
This is the part people miss. Even traditional pre-tax deferrals are subject to Social Security and Medicare taxes at the time of contribution.7Internal Revenue Service. Retirement Plan FAQs Regarding Contributions The deferral only shields you from federal income tax. For 2026, that means 6.2% for Social Security on earnings up to $184,500, plus 1.45% for Medicare on all earnings.8Social Security Administration. Contribution and Benefit Base The upside is that deferred wages still count toward your Social Security benefit calculation.
2026 Deferral Limits
The IRS adjusts deferral ceilings annually for inflation under Internal Revenue Code Section 402(g).9Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust The cap applies to the total of all elective deferrals across every qualifying plan you participate in during the year. The exception is 457(b) plans, which run on their own track.
Standard Limits
- 401(k), 403(b), and 457(b) plans: $24,500 per person
- SIMPLE IRA plans: $17,000, or $18,100 for certain applicable SIMPLE plans
Catch-Up Contributions at Age 50
If you turn 50 or older by the end of the calendar year, you can contribute above the standard limit:1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
- 401(k), 403(b), and 457(b) plans: $8,000 catch-up, for a total of $32,500
- SIMPLE IRA plans: $4,000 catch-up, for a total of $21,000
Super Catch-Up for Ages 60 Through 63
SECURE 2.0 created a higher catch-up tier for workers who are 60, 61, 62, or 63 at the end of the year. For 2026:4Internal Revenue Service. Retirement Topics – 403(b) Contribution Limits
- 401(k), 403(b), and 457(b) plans: $11,250 catch-up, for a total of $35,750
- SIMPLE IRA plans: $5,250 catch-up, for a total of $22,250
Once you turn 64, you drop back to the standard age-50 catch-up amount. The window is narrow.
Mandatory Roth Treatment for High-Earner Catch-Ups
Starting in 2026, if your Social Security wages exceeded $150,000 in the prior calendar year, any catch-up contributions to a 401(k), 403(b), or governmental 457(b) plan must be designated as Roth. You can still make the catch-up, but not on a pre-tax basis. This rule does not apply to SIMPLE IRA catch-up contributions. Workers below the threshold keep the choice between traditional and Roth for their catch-up amounts.
Elective Deferrals Aren’t the Only Money Going In
Your elective deferral is one stream of contributions into your account. Employer contributions are a separate category and do not count against your personal deferral limit.
Matching contributions are the most familiar type. Your employer puts in additional money based on a formula tied to how much you defer, such as 50 cents for every dollar you contribute up to 6% of your salary. These dollars are subject to the plan’s vesting schedule.
Profit-sharing contributions are another employer-funded source. The employer decides how much to allocate and distributes it across eligible employees’ accounts, sometimes without requiring you to defer anything yourself.
All contributions from every source combined are subject to a separate, higher annual ceiling under Section 415(c). For 2026, the total cannot exceed $72,000, or 100% of your compensation, whichever is less.10Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions Catch-up contributions sit on top of that ceiling, so a worker 50 or older could have up to $80,000 in total contributions.11Internal Revenue Service. Fixing Common Plan Mistakes – Failure to Limit Contributions for a Participant
What Happens If You Exceed the Limit
If you contribute to multiple employer plans in the same year, most often because you switched jobs mid-year, it’s easy to accidentally exceed the $24,500 cap. The IRS calls this an “excess deferral,” and the correction window is tight.
You must notify the plan and have the excess amount (plus any earnings on it) distributed back to you by April 15 of the following year.9Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust If you meet that deadline, you include the excess in your taxable income for the year you contributed it, and the earnings are taxed in the year they’re distributed.
Miss April 15, and the math turns punishing. The excess amount gets taxed in the year you contributed it and taxed again when you eventually withdraw it from the plan.12Internal Revenue Service. Consequences to a Participant Who Makes Excess Annual Salary Deferrals Double taxation on the same dollars is the kind of mistake worth avoiding by tracking your deferrals across employers during any transition year.
Elective deferrals are meant to stay in the account until retirement, and the tax code enforces that with a 10% additional tax on most withdrawals before age 59½, with several exceptions and a separate hardship-distribution track for 401(k) plans.13Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions For SIMPLE IRAs, that penalty rises to 25% during the first two years of participation.