403(b) Investment Options: Annuities vs Mutual Funds
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Full bio →The 403(b) is limited by law to two types of investments: annuity contracts and mutual fund custodial accounts. Unlike a 401(k) or IRA, you cannot hold individual stocks or ETFs directly in a 403(b). What this means in practice — and which type to choose — depends heavily on the vendors your employer allows. Use the 403(b) calculator to see how investment fees affect your final balance over time.
Two Investment Types by Law
Annuity contracts (variable or fixed) are insurance products. You contribute to the 403(b) through an insurance company, and money is invested in subaccounts.
Mutual fund custodial accounts hold shares of mutual funds in a custodial account. These function more like a standard brokerage account inside the 403(b).
Many participants — especially in public school plans — are enrolled in annuities without fully understanding the fees involved.
Variable Annuity: What It Is and What It Costs
A variable annuity inside a 403(b) holds your money in insurance subaccounts. The value varies with market performance. Costs typically include:
| Fee type | Typical range | What it pays for |
|---|---|---|
| Mortality and expense (M&E) charge | 0.50–1.50% | Insurance company overhead and profit |
| Administrative fee | 0.15–0.50% | Record-keeping |
| Fund expense ratio | 0.40–1.50% | Underlying fund management |
| Total typical cost | 1.05–3.50% | — |
Riders (guaranteed minimum income, death benefit, etc.) add 0.20–1.00% more annually.
The insurance guarantee you’re paying for: Variable annuity insurers typically guarantee a minimum death benefit (the greater of premiums paid or account value). For younger investors with long time horizons, this guarantee provides minimal value relative to its cost.
Fixed Annuity
A fixed annuity provides a guaranteed interest rate for a defined period. Some 403(b) plans offer a stable value fund (sometimes structured as a fixed annuity) that provides capital preservation with a modestly higher yield than money market funds.
When fixed makes sense: If you are within 5 years of retirement and want principal protection for a portion of your balance, a stable value fund or fixed annuity subaccount is a legitimate tool. For a 30-year-old teacher, it is almost always the wrong choice for the bulk of contributions.
Mutual Fund Custodial Accounts: Lower Costs
Plans offered through Vanguard, Fidelity, Schwab, or TIAA’s mutual fund platform provide access to index funds with expense ratios as low as 0.03–0.20%.
| Fund type | Typical expense ratio |
|---|---|
| S&P 500 index fund (Vanguard, Fidelity) | 0.03–0.05% |
| Total market index fund | 0.03–0.05% |
| Target-date fund (low-cost provider) | 0.10–0.15% |
| Actively managed large-cap fund | 0.50–1.20% |
| Target-date fund (high-cost provider) | 0.50–0.80% |
Fee Impact Over a Career
$500/month for 30 years, 7% gross return before fees:
| Annual fee | Final balance |
|---|---|
| 0.05% | $567,400 |
| 0.50% | $519,700 |
| 1.00% | $474,500 |
| 2.00% | $394,700 |
| 3.00% | $328,000 |
A 3% fee structure (common in variable annuity-heavy plans) costs over $239,000 compared to a low-cost index fund approach on identical contributions. This is purely fee drag — the same market return, the same contribution, the same person. Fees are the only difference.
How to Evaluate Your 403(b) Vendor
- Request the full list of investment options from HR or your plan administrator
- Find the expense ratio for each fund (listed in the prospectus or fund fact sheet)
- Look for surrender charges — some annuity products charge 5–7% of your balance if you switch vendors or withdraw during the surrender period (often 7–10 years)
- Ask if there are annual administrative fees separate from fund expenses
- Compare to a low-cost benchmark — a Vanguard 500 index fund at 0.04% is a common benchmark
If your plan only offers high-fee annuity products and no low-cost fund options, talk to your HR department or union about adding a low-cost vendor. Many districts have added Vanguard or Fidelity options after employee pressure.
Surrender Charges: The Exit Trap
Variable annuities often include a surrender period — typically 7–10 years — during which you pay a penalty (surrender charge) to move money to a different vendor or product. Surrender charges typically start at 7% and decrease 1% per year.
If you are currently in a surrender period, calculate the total cost to exit (surrender charge + foregone fees) versus staying. In many cases, the ongoing fee drag exceeds the surrender charge within 3–5 years.
For teachers specifically, see 403(b) for teachers for vendor selection guidance. To see the fee impact on your specific balance, use the investment fee field in the 403(b) calculator.