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Can a non-profit have a 403b and a 401K?
Yes, a Sec. 501©(3) organization can offer both a 403(b) plan and 401(k) plan simultaneously. There's very little to recommend this arrangement, though, which offers minimal advantages in return for numerous administrative headaches and troubles. The Sec. 402(g) salary reduction limit ($13,000 for 2004) must be coordinated with salary reductions under 401(k). An employee can't reduce his salary by more than 1X the annual 402(g) limit, regardless of the number plans in which he participates.
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How about a 403b and a simple?
No. An employer can't make contributions to a SIMPLE plan if its employees receive an allocation of contributions (or an increase in accrued benefit) under any other "qualified retirement plan". For this purpose, a "qualified plan" includes a 403(b) arrangement.
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What options are available for a group of 4 wishing to save for retirement, cash flow is not big, but they do want to save.
It sounds as if your start-up organization would like to provide a vehicle for its employees to defer portions of their salaries, but without being on the hook for an employer contribution and significant administrative costs.
The simplest and least costly approach is to offer a non-ERISA 403(b) plan. Employees can make voluntary deferral elections, the employer makes zero-zip-nada contributions, and there's nothing to administer -- the organization simply acts as a conduit to withhold the salary reductions and remit them to annuity providers and/or custodial accounts.
I know that our 403(b) detractors will take issue with this opinion, but a non-ERISA 403(b) arrangement remains the simplest way for a struggling employer to offer some sort of retirement benefit without incurring prohibitive expenses or plan contributions.