Retirement Planning
Solo 401(k), SEP IRA, Traditional and Roth IRA, and other retirement options for the self-employed.
September 23, 2026
Do I Need an EIN to Open a Solo 401(k)?
Usually yes — but it's your business's own EIN, not a separate 'plan EIN.' The IRS requires the employer's EIN on your plan's paperwork and won't accept a Social Security number there.
September 23, 2026
Can I Contribute to a SEP IRA and a 401(k) at the Same Time?
Yes — a self-employment SEP IRA and a day-job 401(k) don't share a limit, because a SEP has no employee deferral piece at all. Here's how each is actually calculated.
September 23, 2026
Can I Have a Solo 401(k) and a 401(k) at Work?
Yes — but your employee deferral limit is shared between both plans, not doubled. Here's exactly how the IRS splits it, with a worked example.
September 23, 2026
Can My Spouse Contribute to My Solo 401(k)?
Yes, if your spouse also earns income from your business — the plan stays a simplified 'one-participant' plan, and each of you gets your own separate contribution limit.