Seasonal staff and a family payroll change which plan is even available. Plan contributions can also change the taxable estate you estimate on the estate-tax calculator. This page compares eligibility and 2026 IRS limits. It does not project an account balance.
Educational comparison using IRS limits for 2026; eligibility, nondiscrimination testing, coverage, and deadlines depend on the facts and the plan documents; not tax or legal advice. Figures are contribution limits, not projections of investment results. Vital Investment Management, LLC is a fee-only, independently owned, locally based, SEC-registered investment adviser. Registration does not imply a certain level of skill or training. Form ADV · Form CRS.
2026 limits
For 2026, the IRS elective deferral limit for a 401(k) is $24,500. The catch-up contribution is $8,000 at age 50 or older, and $11,250 for a person who turns 60, 61, 62, or 63 in 2026. Annual additions are $72,000. Compensation used for the percentage limits is capped at $360,000. A SEP contribution is limited to $72,000. A SIMPLE IRA deferral is $17,000, or $18,100 when the higher small-employer limit applies. The defined-benefit annual benefit limit is $290,000. That benefit limit is not a cash balance deposit and not a projected balance.
Rules as of 2026-10-22. Sources: IRS news release IR-2025-111 and Notice 2025-67.
Worked example
An S corporation owner, age 52, with $180,000 of W-2 wages, two eligible employees, and $90,000 of eligible payroll. The first eligible card on these entries is Safe Harbor 401(k), with an owner amount of $77,500 under the limits above.
SEP IRA
SEP employer contribution up to the lesser of 25% of compensation or $72,000 for 2026. Compensation counted for the percentage is capped at $360,000. Eligible employees receive the same percentage of pay that the plan uses for the owner. A self-employed owner's own dollar amount uses the reduced rate from IRS Publication 560. The employee percentage is not reduced the same way. In the worked example the owner amount under the published limits is $45,000.
SIMPLE IRA
2026 increased SIMPLE deferral of $18,100 because eligible employees are 25 or fewer, plus the age-based catch-up. The employer must make either a match, generally up to 3% of pay, or a 2% nonelective contribution. A SIMPLE IRA generally cannot run beside another employer plan for the same people. The 2026 higher deferral of $18,100 is used here only when eligible employees are 25 or fewer. In the worked example the owner amount under the published limits is $27,350.
Solo 401(k)
Employee deferral up to $24,500 for 2026, plus the age-based catch-up, and employer contributions inside the $72,000 annual-additions limit. A solo 401(k) is for an owner, and a spouse on payroll, with no other eligible employees. Annual additions, other than catch-up contributions, cannot exceed $72,000. An existing plan shares that limit. It is not a second full limit. In the worked example the owner amount under the published limits is $0.
Safe Harbor 401(k)
Elective deferral up to $24,500 for 2026. Employer contributions, including the safe harbor, stay inside the $72,000 annual-additions limit. The 3% nonelective contribution shown here is the predictable safe harbor minimum, not a same-percentage profit-sharing cost. Extra profit sharing can require nondiscrimination testing or a gateway contribution for staff. In the worked example the owner amount under the published limits is $77,500.
Cash balance plan, with a 401(k)
The 401(k) portion shown is deferrals plus an employer contribution of up to 6% of capped compensation. The cash balance deposit itself is not a published dollar limit. IRC section 415(b) caps the annual benefit at $290,000 for 2026. The $290,000 figure is the 2026 IRC section 415(b) limit on the annual benefit, not a contribution and not a projected account balance. Only an actuary can turn that benefit limit into a deposit. When a cash balance plan is combined with a 401(k), the 401(k) employer piece shown here is limited to 6% of capped compensation plus elective deferrals. In the worked example the owner amount under the published limits is $43,300.
Questions
Does a solo 401(k) allow employees?
No, other than a spouse on payroll. If you enter other eligible employees, the solo 401(k) card is marked unavailable.
Are the dollar figures projected investment results?
No. They are 2026 IRS contribution limits. The page does not grow a balance.
Where do the 2026 limits come from?
IRS news release IR-2025-111 and Notice 2025-67. The Social Security wage base used in the self-employment calculation is $184,500 for 2026.
Compare your own figures
Results appear on this page. Nothing is emailed unless you ask.
Educational comparison using IRS limits for 2026; eligibility, nondiscrimination testing, coverage, and deadlines depend on the facts and the plan documents; not tax or legal advice. Figures are contribution limits, not projections of investment results. Vital Investment Management, LLC is a fee-only, independently owned, locally based, SEC-registered investment adviser. Registration does not imply a certain level of skill or training. Form ADV · Form CRS.