Are Bonuses Subject to SIMPLE IRA Contributions?

Yes, bonuses are subject to SIMPLE IRA contributions. The IRS defines compensation for a SIMPLE IRA as wages, tips, and other pay subject to federal income tax withholding, plus any salary reduction contributions the employee elected. Because bonuses are withheld on like regular wages, they sit inside that definition, and both the employee’s deferral election and the employer’s matching or nonelective contribution apply to them.

Why Bonuses Count as SIMPLE IRA Compensation

Under IRC Section 408(p)(6)(A), compensation for a SIMPLE IRA is the amount reported under Section 6051(a)(3) and (8) of the tax code. Section 6051(a)(3) covers total wages subject to federal income tax withholding under Section 3401(a), and Section 6051(a)(8) captures elective deferrals to retirement plans.1Office of the Law Revision Counsel. 26 U.S. Code 6051 – Receipts for Employees Since employers withhold income tax from bonuses just like regular paychecks, bonuses land automatically in the compensation base used to figure SIMPLE IRA contributions.

The IRS is direct about it. Its SIMPLE IRA Fix-It Guide tells employers to “include bonuses, overtime, commissions and all other categories of compensation” when calculating both employee elective deferrals and employer contributions.2Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Used the Wrong Compensation Definition The label the employer puts on the payment doesn’t matter. Year-end performance bonuses, holiday bonuses, sales commissions, and overtime all count.

A common misconception is that a plan document can narrow the definition and carve bonuses out. It can’t. The statutory definition under Section 408(p) is the floor. If plan documents purport to exclude bonuses, the employer is using the wrong compensation definition, and the IRS treats that as a plan failure that has to be corrected.

What This Means for Your Deferral

If you’ve elected to defer a percentage of pay, that percentage applies to every dollar you earn, bonuses included. Elect 5%, receive a $10,000 bonus, and $500 comes out and goes into your SIMPLE IRA.

If you instead elected a flat dollar amount, the bonus itself won’t change what’s withheld, but you can adjust your election during the plan’s annual 60-day window. Before each plan year, employers must notify eligible employees about their opportunity to start, change, or stop salary reduction contributions and about which contribution method the employer will use for the coming year.3Internal Revenue Service. Retirement Plans FAQs Regarding SIMPLE IRA Plans If you expect a large bonus and want to shelter more of it, that’s the moment to change your election.

Watch the annual cap. For 2026, the standard employee deferral limit for SIMPLE IRAs is $17,000, up from $16,500 in 2025.4Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Catch-up contributions raise it further:

Employers with 25 or fewer employees who each received at least $5,000 in compensation may offer enhanced limits: an $18,100 base deferral with a $3,850 catch-up for employees 50 and over. If you’re close to the cap, a bonus can push you over. Check your year-to-date deferrals after a bonus lands, because excess deferrals create tax cleanup work.

What This Means for the Employer’s Match

Including bonuses in compensation directly increases what the employer owes. Each year the employer picks one of two contribution methods:

  • Dollar-for-dollar match up to 3% of compensation. The employer matches whatever the employee defers, capped at 3% of total compensation, bonuses included. The employer can temporarily drop this to as low as 1%, but not for more than two out of any five years.5Internal Revenue Service. SIMPLE IRA Plan
  • 2% nonelective contribution. The employer contributes 2% of each eligible employee’s compensation whether or not the employee defers. This is subject to the annual compensation limit of $360,000 for 2026.3Internal Revenue Service. Retirement Plans FAQs Regarding SIMPLE IRA Plans

The dollar impact is real. Take an employer using the 3% match and an employee earning $60,000 in base salary who receives a $15,000 bonus. Without the bonus, the maximum match would be $1,800 (3% of $60,000). With the bonus, the match cap rises to $2,250 (3% of $75,000). If the employee is deferring at least that much, the employer owes the higher figure. Employers who budget for matching contributions without factoring in projected bonuses can end up with an unexpected bill at year-end.

Deposit Deadlines for Bonus Deferrals

When a deferral is withheld from a bonus check, the employer has to get that money into the employee’s SIMPLE IRA quickly. Department of Labor rules require the deposit as soon as the employer can reasonably segregate the funds from general business assets. For most SIMPLE IRA plans, which typically have fewer than 100 participants, a 7-business-day safe harbor applies.6Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Didn’t Deposit Employee Elective Deferrals Timely

This is where employers slip most often with bonuses. Regular payroll deferrals flow through an automated system, but a one-time bonus check processed outside the normal cycle can fall through the cracks. A late deposit is treated as a prohibited transaction. The initial excise tax is 15% of the amount involved for each year it stays uncorrected, and if the employer fails to fix it, an additional 100% tax can apply.7Internal Revenue Service. 401(k) Plan Fix-It Guide – You Haven’t Timely Deposited Employee Elective Deferrals Late deposits can’t be corrected through the IRS’s Employee Plans Compliance Resolution System, but they may be resolved through the DOL’s Voluntary Fiduciary Correction Program.

Fixing It If Bonuses Were Left Out

An employer that discovers it left bonuses out of the compensation calculation has to put affected employees where they would have been. The SIMPLE IRA Fix-It Guide sets out the corrective contribution:8Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide

  • Missed employee deferrals: the employer contributes 50% of the employee’s elected deferral percentage multiplied by the excluded compensation (the bonus amount that should have been included).
  • Missed employer contributions: the full employer contribution that would have applied to the excluded compensation, either the matching amount or the 2% nonelective amount.
  • Lost earnings: both amounts adjusted for earnings from the date the contribution should have been made through the correction date, using actual plan investment returns or a reasonable interest rate.

Employers may be able to self-correct under the IRS’s Self-Correction Program without contacting the IRS or paying a fee, but only if appropriate procedures were in place and the failure qualifies as insignificant. Larger or systemic errors go through the Voluntary Correction Program, which involves a compliance fee. Either way, update payroll procedures right away so the bonus cycle doesn’t produce the same error next year, and keep documentation of the correction in case of an audit.