What Investment Options Are Unique to 403(b) Plans Compared to 401(k) Plans?
Two employees at similar salaries, one at a company with a 401(k) and one at a school district with a 403(b), can end up looking at strikingly different investment menus even though both plans are saving toward the same basic goal.
The short answer
While 403(b) plans and 401(k) plans share the same basic tax treatment for contributions, 403(b) plans can offer annuity contracts issued by insurance companies as an investment option, a feature that isn’t part of a typical 401(k) lineup. Many 403(b) plans also offer mutual funds through custodial accounts similar to a 401(k), but the annuity option is the structural difference that sets the two plan types apart.
Where the difference comes from
The distinction traces back to how the tax code originally defined these plans. Section 403(b) of the tax code was built around annuity contracts from the start, which is part of why insurance companies remain deeply involved in administering many of these plans today, a history explored further in why some 403(b) plans offer annuities instead of mutual funds. Mutual fund custodial accounts were added to the 403(b) framework later, which is why many current plans offer a mix of both annuity contracts and fund-based investments rather than one exclusively.
What an annuity option inside a 403(b) generally looks like
- Fixed annuity contracts. These offer a stated rate of return set by the insurance company, with the rate subject to change over time and set according to the contract’s terms.
- Variable annuity contracts. These allocate contributions among sub-accounts that behave similarly to mutual funds, with returns that move with the underlying investments rather than a fixed rate.
- Surrender charges. Some annuity contracts include a schedule of fees for withdrawing or transferring money out within a certain number of years, a feature not typically found in a standard mutual fund.
Why the extra features matter for participants
Annuity contracts inside a 403(b) can come with additional layers of cost beyond a typical fund’s expense ratio, including mortality and expense charges tied to the insurance features of the contract. These costs pay for contract features and stated minimum-payout provisions, but they also mean a straightforward comparison between a 403(b) annuity option and a plain index fund in a 401(k) isn’t always apples to apples. Understanding what a specific contract charges and what it promises in exchange is part of evaluating whether the annuity option or an available fund alternative fits a person’s situation.
Moving among options within a 403(b)
Because 403(b) plans sometimes offer more than one provider, a participant may be able to shift money among different investment options or even different vendors within the same plan, a process covered in more detail in what a 403(b) exchange between vendors involves. That flexibility is one more way 403(b) plans can differ meaningfully from the single-recordkeeper structure most 401(k) plans use.
What to weigh when comparing the two
- Cost structure. Annuity contracts often layer insurance-related charges on top of underlying investment costs, so total cost is worth checking carefully.
- Minimum-payout features offered. Some annuity features, like a contractually stated minimum payout, exist specifically to offset market risk, which may or may not be relevant depending on a person’s broader retirement picture.
- Liquidity and surrender terms. Restrictions on moving money out of an annuity contract can differ substantially from the flexibility typical of a mutual fund.
The bottom line
The annuity contract option is the feature that most distinguishes many 403(b) investment menus from a typical 401(k) lineup, a byproduct of how the tax code originally structured these plans around insurance products. Neither structure is inherently better in all cases; the details of costs, contract features, and available fund alternatives within a specific plan are what actually determine how the two compare.