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. For 2026, you can defer up to $24,500 across most workplace plans, with higher ceilings for workers 50 and older.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 The money is invested inside the plan according to your instructions and grows either tax-deferred or tax-free depending on how you set up the contributions.
How It Works in Practice
You elect a percentage of your salary or a flat dollar amount through your plan’s enrollment system. Your employer withholds that amount from each paycheck before calculating your net pay, routes it into your retirement account, and invests it in whichever funds you’ve selected from the plan menu. You can usually adjust the election for future pay periods whenever you want.
Your employer reports the deferral on your Form W-2 using a Box 12 code that identifies the type of plan. Code D is a 401(k), Code E is a 403(b), Code S is a SIMPLE IRA, and other codes cover the rest.2Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans
One detail that surprises people: your own 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 often follow a vesting schedule that can take several years to fully kick in.
Which Plans Accept Elective Deferrals
Several employer-sponsored plans use the same basic deferral mechanics but carry different limits and rules.
401(k) plans are the most common vehicle in the private sector. The 2026 deferral limit is $24,500, and many employers add a match on top of what you contribute.
403(b) plans cover employees of public schools, universities, and certain tax-exempt organizations. They share the $24,500 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 still cannot exceed $24,500.
457(b) plans serve state and local government workers and some nonprofit employees. 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. 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 are used by many small businesses. The 2026 limit is lower: $17,000, 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 Catch-up and matching rules differ from the larger plans.
Traditional vs. Roth Deferrals
Elective deferrals come in two flavors. The choice determines when you pay income tax on the money, and it’s one of the more consequential decisions you’ll make inside a retirement plan.
With traditional (pre-tax) deferrals, your contribution is subtracted from your taxable wages before federal income tax is calculated. A $24,500 deferral reduces your taxable income by that amount for the year. You don’t pay income tax on the money until you withdraw it in retirement, at which point both the original contributions and all the investment growth are taxed as ordinary income.5Internal Revenue Service. Publication 525 – Taxable and Nontaxable Income
Roth deferrals go in after you’ve already paid income tax. Your current paycheck is smaller, but qualified distributions in retirement are completely tax-free, including the accumulated earnings.6Internal Revenue Service. Retirement Topics – Designated Roth Account A distribution qualifies if it occurs at least five years after your first Roth contribution and after you reach age 59½, become disabled, or die.
Workplace Roth deferrals have no income limit, unlike Roth IRAs. High earners who are shut out of direct Roth IRA contributions can still make Roth deferrals through their employer’s plan. The practical question is whether you expect your tax rate to be higher now or in retirement. Lower bracket now generally argues for Roth; peak earning years generally argue for traditional.
One thing both types share: payroll taxes still apply at the time of contribution. Even pre-tax deferrals are subject to Social Security and Medicare taxes when the money comes out of your paycheck.7Internal Revenue Service. Retirement Plan FAQs Regarding Contributions The deferral shields you from federal income tax only. For 2026, that’s 6.2% for Social Security on earnings up to $184,500 and 1.45% for Medicare on all earnings.8Social Security Administration. Contribution and Benefit Base The upside is that your deferred wages still count toward your Social Security benefit calculation.
2026 Limits at a Glance
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 your elective deferrals across every qualifying plan you participate in during the year, except that 457(b) plans run on a separate 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 for Age 50 and Older
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), 457(b): $8,000 catch-up, for a total of $32,500
- SIMPLE IRA: $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 year end. For 2026:4Internal Revenue Service. Retirement Topics – 403(b) Contribution Limits
- 401(k), 403(b), 457(b): $11,250 catch-up, for a total of $35,750
- SIMPLE IRA: $5,250 catch-up, for a total of $22,250
Once you turn 64, you drop back to the standard age-50 catch-up. The window is narrow and worth planning around.
Mandatory Roth Catch-Ups for High Earners
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 you lose the pre-tax option. The rule does not apply to SIMPLE IRA catch-ups, and workers earning below the threshold keep the choice between traditional and Roth.
Your Deferrals Are Separate from Employer Money
Your elective deferral is only one stream flowing 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. The employer puts in additional money based on a formula tied to how much you defer, often something like 50 cents per dollar up to 6% of salary. Matching dollars follow the plan’s vesting schedule rather than vesting immediately like your own contributions. Profit-sharing contributions are a separate employer-funded source, allocated under a formula the employer sets.
All contributions from every source combined, including your deferrals, employer matches, profit-sharing, and reallocated forfeitures, are subject to a separate ceiling under Section 415(c). For 2026, that 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 aged 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
If You Go Over the Limit
Contributing to multiple employer plans in the same year, as often happens when you change jobs, can push you over the $24,500 cap by accident. The IRS calls this an excess deferral, and the fix is time-sensitive.
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 Hit the deadline and you include the excess in your taxable income for the year you contributed it, with the earnings taxed in the year they’re distributed.
Miss the deadline and the math gets worse. The excess is 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 Tracking your deferrals across employers during a transition year prevents the double hit.
Getting the Money Out
Elective deferrals are built to stay in the account until retirement, and the tax code enforces that preference.
Withdrawals before age 59½ generally trigger a 10% additional tax on top of the income tax you owe.13Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions For SIMPLE IRAs, the penalty jumps to 25% if you withdraw within your first two years in the plan. Several exceptions waive the 10%, including total disability, separating from an employer at age 55 or older, substantially equal periodic payments, qualifying medical expenses above 7.5% of AGI, and distributions under a qualified domestic relations order.
Some 401(k) plans allow hardship distributions from your deferral account while you’re still employed, for immediate and heavy financial needs such as certain medical costs, tuition, payments to prevent eviction or foreclosure, funeral expenses, and specific home repairs.14Internal Revenue Service. Retirement Topics – Hardship Distributions The withdrawal is limited to the amount you actually need, is taxable, may trigger the 10% penalty, and cannot be repaid to the plan.
At the other end, you can’t leave pre-tax deferrals in the account forever. Required minimum distributions must begin at a set age:15Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs
- Born 1951 through 1959: RMDs begin at age 73
- Born 1960 or later: RMDs begin at age 75
Your first distribution is due by April 1 of the year after you reach your RMD age. If you’re still working for the plan sponsor and don’t own more than 5% of the company, you can delay RMDs from that current employer’s 401(k) until you actually retire. Roth 401(k) accounts were previously subject to RMDs, but SECURE 2.0 eliminated that requirement starting in 2024, aligning them with Roth IRAs.