Are Bonuses Subject to SIMPLE IRA Contributions?

Yes, bonuses are subject to SIMPLE IRA contributions. A bonus is wages for federal income tax withholding, which makes it compensation under the SIMPLE IRA rules, so the employee’s elected deferral percentage comes out of the bonus and the employer’s match or 2% nonelective contribution is calculated on it the same as on base pay.1Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Used the Wrong Compensation Definition

Why Bonuses Are Treated as Compensation

IRC Section 408(p)(6)(A) defines SIMPLE IRA compensation by reference to 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) picks up elective deferrals to retirement plans.2Office of the Law Revision Counsel. 26 U.S. Code 6051 – Receipts for Employees Because employers must withhold income tax from a bonus, it falls inside that base automatically.

The IRS Fix-It Guide tells employers in plain terms to “include bonuses, overtime, commissions and all other categories of compensation” when calculating both employee deferrals and employer contributions.1Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Used the Wrong Compensation Definition The label on the payment doesn’t matter. A year-end performance bonus, a holiday bonus, sales commissions, and overtime all count.

A common misconception is that plan documents can carve bonuses out of the compensation definition. They can’t. The statutory definition is the floor, and an employer that uses a narrower definition is running the plan on the wrong compensation base and must correct the shortfall.

How a Bonus Changes the Employee Deferral

If you’ve elected a percentage deferral, that percentage applies to the bonus check. On a 5% election, a $10,000 bonus produces a $500 contribution to your SIMPLE IRA, withheld from the bonus just as it would be from a regular paycheck. If you’ve instead elected a flat dollar amount per pay period, the bonus doesn’t automatically increase your contribution; the amount keeps coming out at the dollar figure you chose.

You can change your election during the 60-day period before each plan year, when the employer is required to tell you what contribution method it will use and give you the chance to start, change, or stop salary reduction contributions.3Internal Revenue Service. Retirement Plans FAQs Regarding SIMPLE IRA Plans If you know a large bonus is coming and you want more of it sheltered, that’s the window to raise your percentage.

Watch the annual cap as a bonus pushes your year-to-date deferrals higher. For 2026 the standard employee deferral limit 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 sit on top:

Employers with 25 or fewer employees who each received at least $5,000 in compensation may offer enhanced limits: a $18,100 base deferral and a $3,850 catch-up at age 50 and over. Excess deferrals create a tax mess the following filing season, so if a bonus is likely to put you near the ceiling, check your pay stub totals before the next payroll closes.

A bonus deferral also reduces your current-year taxable wages. Defer $3,000 of a $10,000 bonus and only $7,000 shows up as taxable wages on your W-2 for income tax purposes. Social Security and Medicare still apply to the full amount, and the deferred money is taxed as ordinary income when you later withdraw it.

How a Bonus Changes What the Employer Owes

Because the bonus is compensation, it feeds directly into the employer contribution calculation. Each year the employer picks one of two methods:

  • A dollar-for-dollar match on employee deferrals up to 3% of compensation, including bonuses. The match can be dropped as low as 1%, but not for more than two years out of any five.5Internal Revenue Service. SIMPLE IRA Plan
  • A 2% nonelective contribution for each eligible employee, regardless of whether 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

Take an employee earning $60,000 in base salary who receives a $15,000 bonus, with an employer using the 3% match. Without the bonus, the match cap is $1,800 (3% of $60,000). With the bonus included in compensation, the cap rises to $2,250 (3% of $75,000). If the employee defers at least that much, the employer owes the higher figure. Budgeting for matching contributions on base salary alone leaves a gap at year-end.

Depositing the Deferral From a Bonus Check

Once the employee’s deferral is withheld from a bonus, it has to move into the SIMPLE IRA quickly. Department of Labor rules require deposit as soon as the employer can reasonably segregate the funds from general business assets, with a 7-business-day safe harbor for plans with fewer than 100 participants, which covers most SIMPLE IRAs.6Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Didn’t Deposit Employee Elective Deferrals Timely

Bonuses are where this slips. A one-off bonus check processed outside the normal payroll cycle can miss the automated transfer. A late deposit is treated as a prohibited transaction, with an initial excise tax of 15% of the amount involved for each year it remains uncorrected, and up to 100% if the employer never fixes it.7Internal Revenue Service. 401(k) Plan Fix-It Guide – You Haven’t Timely Deposited Employee Elective Deferrals Late deposits can’t be fixed through the IRS’s Employee Plans Compliance Resolution System, but the DOL’s Voluntary Fiduciary Correction Program is available.

Fixing a Plan That Left Bonuses Out

If an employer finds it has been excluding bonuses from the compensation base, the IRS expects a corrective contribution that puts employees where they would have been. The Fix-It Guide gives the formula: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 bonus amount.
  • Missed employer contributions: the full match or 2% nonelective amount that would have applied to the excluded bonus.
  • Lost earnings: both figures are adjusted for earnings from the date the contribution should have been made through the date of correction, using actual plan investment returns or a reasonable interest rate.

Insignificant failures with reasonable procedures already in place may qualify for the Self-Correction Program, with no IRS filing or fee. Larger or systemic errors go through the Voluntary Correction Program, which carries a compliance fee. In either case, update payroll to pull bonuses into the compensation base going forward and keep documentation of the correction in the plan file.