Retirement — Private Sector
About this plan
A Solo(k) plan — also known as an Individual 401(k) — is designed for self-employed individuals and owner-only businesses with no full-time employees other than the owner and spouse. NBS administers Solo(k) plans with the same compliance rigor as our multi-participant plans.
What's Included
For Employers
As a sole proprietor or owner-only business, a Solo(k) lets you maximize retirement savings with both employee and employer contributions. NBS handles the plan document and annual compliance.
For Participants
Your Solo(k) combines employee deferrals and employer contributions — allowing you to save more for retirement than most other self-employed options.
IRS Contribution Limits
Annual limits set by the IRS for tax-advantaged retirement contributions.
Elective Deferral Limit
All eligible employees
Age 50+ Catch-Up Contribution
Employees age 50 and older
Available if your plan permits.
Super Catch-Up Contribution
Employees ages 60–63 (SECURE 2.0)
Available if your plan permits.
Maximum Annual Additions
All contributions combined (employer + employee)
Age 50–59 & 64+
$32,500
Base $24,500 + catch-up $8,000
Ages 60–63 (SECURE 2.0)
$35,750
Base $24,500 + super catch-up $11,250
Combined totals assume your plan permits the applicable catch-up.
Catch-up contributions are plan-optional — your plan document governs which are available. Limits updated annually by the IRS. SECURE 2.0 super catch-up (ages 60–63) continues for 2026. View on IRS.gov →
NBS administers more than Solo(k) Plans
Many employers use NBS across multiple benefit types — consolidating administration simplifies vendor management and gives your employees a consistent experience. You may also be interested in these related plans.
