Updated July 28, 2026. Quick answer: The doubling is real: every limit here is per person, so a genuinely employed spouse roughly doubles household capacity, and the IRS treats a plan covering an owner “and his or her spouse” as still one-participant. But the guardrails people quote are not a retirement-plan rule — they come from the common-law employee test and the §162(a)(1) reasonable-compensation standard.
Why it doubles
IRC §402(g)(1)(A) limits “the elective deferrals of any individual” — per individual, not per plan. §415(c)(1) is likewise a per-participant limit. Two participants, two sets of limits. There is no household cap.
The requirements, and where they actually come from
| Requirement | Its real source |
|---|---|
| The spouse must genuinely work in the business | Not a plan rule. Publication 560 defines plan compensation as pay for personal services actually rendered — no services, no compensation, no base |
| Pay must be reasonable | IRC §162(a)(1), “a reasonable allowance for salaries … for personal services actually rendered” |
| Must be an employee, not a partner | IRS: “If your spouse is your employee, not your partner, you must pay Social Security and Medicare taxes for them” |
Anyone citing a specific “spouse rule” in the retirement-plan sections of the Code is inventing it. There is no such provision. The constraints are the general employee and reasonable-compensation standards, applied to this situation. That distinction matters if you are ever asked to justify the arrangement.
The cost that gets left out
Spousal wages carry employer-side payroll tax, and in an S corporation the whole payroll apparatus. The household benefit is smaller than the headline contribution doubling suggests, and on a modest salary the payroll cost can eat a meaningful share of the advantage. Work the numbers on the combined position rather than on the contribution alone.
Every dollar limit in this area is indexed and changes annually. The figures printed in the Code itself — $40,000 for the defined-contribution limit, $160,000 for the defined-benefit limit, $15,000 for elective deferrals — are 2001 and 2005 base amounts that will never be updated in the statute; IRC §415(d) and §402(g)(4) do the adjusting. Get the current year’s figures from the IRS cost-of-living notice for that year rather than from any article, including this one. Nothing on this page states a dollar amount for that reason.
Sources
IRC §402(g)(1)(A) and §415(c)(1) (both per individual); §162(a)(1) (reasonable compensation); IRS Publication 560 (plan compensation is pay for personal services actually rendered); IRS Married couples in business; IRS One-participant 401(k) plans.
This states what the cited authority says. It is not tax advice, and retirement-plan design turns on facts about your business and your other entities that no page can see. Every dollar limit referenced here is indexed and changes annually.