What it means
Contributions come out of your pay before income tax is calculated, so your taxable income falls and your tax bill drops. The money is invested and grows without annual tax on dividends, interest or gains.
When you retire and take money out, withdrawals are taxed as ordinary income. Taking money out before the age set by the tax rules usually adds a penalty on top of the tax, with limited exceptions, so the plan is designed for long-term saving.
Historically these plans held annuity contracts sold by insurers, which is where the name comes from. Today many also offer mutual funds held in custodial accounts, so employees can choose between insurance products and funds with different fees and guarantees.
The government sets an annual limit on how much an employee can defer, adjusted over time, and some plans allow extra catch-up contributions for older workers or those with long service. Employers may add their own contributions, which is effectively free money and often worth capturing first.
Fees deserve attention. Some annuity products carry high charges, surrender fees for early exit, or complex features, and these can eat into returns over decades.
A teacher or nurse comparing options should look at total annual cost, not just the sales pitch. Rules on access are worth knowing before you start.
Many plans allow loans or hardship withdrawals, but these have conditions, and from a certain age the tax rules require you to start taking minimum distributions. Understanding these points early helps employees treat the plan as long-term money and avoid costly surprises.
In practice
Real-world examples.
Example
A high school teacher contributes 6% of her $70,000 salary into her 403(b). Her employer adds a matching contribution, so her retirement pot grows faster than her own savings alone would allow. Over a 30-year career the match alone can add tens of thousands of dollars to her balance.
Example
A hospital nurse reviews her plan and discovers her annuity charges an annual fee of 2%. She moves future contributions into a low-cost fund with fees below 0.5%. The change saves her roughly $1,500 a year in costs on a $100,000 balance, which compounds over time.
Example
A university administrator close to retirement uses the catch-up rules to put in extra money each year. He wants to boost his savings in the final decade of work. He also reviews his investment mix with a planner to make sure it still suits his shorter time horizon.
Formula
Calculation
Tax saved = Contribution x Marginal tax rate
An employee earning $60,000 contributes $10,000 to the plan and is in a 24% marginal bracket. The tax saved is $10,000 x 0.24 = $2,400, so the cost to take-home pay is $10,000 - $2,400 = $7,600. If the $10,000 grows at 5% for 20 years, it becomes about $26,500, all of which is taxable when withdrawn. Remember that the tax saving is a deferral: the same $26,500 will be taxed as income when it is withdrawn, ideally at a lower rate in retirement.Case study
Seen in the real world.
Lakeside Community College is an illustrative, fictional school whose staff retirement plan relied on a single insurer offering high-fee annuities. A finance officer, Elena, noticed that many teachers were paying more than 2% a year in total costs.
She presented the board with a comparison showing that on a $100,000 balance, a 2% fee costs $2,000 a year, while a 0.5% fee costs $500. The board opened the plan to a low-cost fund provider.
In the fictional outcome staff retained more of their returns over time. The story shows that choosing the tax-sheltered wrapper is only half the job, and the investments inside matter too. Elena now repeats the fee comparison every year and shares the results with new hires during their orientation, so that each teacher understands the cost of the options before choosing one.
Watch out
Common mistakes.
- Assuming that all annuities inside the plan are good value, without comparing fees and surrender charges.
- Treating the money as freely available, when early withdrawals can bring tax and penalties.
- Not claiming the employer match, which gives up part of your pay.
Questions
People also ask.
Who can use a tax-sheltered annuity?
Employees of public schools and certain tax-exempt organisations such as charities, hospitals and universities, subject to their employer offering the plan.
Is it the same as a 401(k)?
They are very similar in how contributions and tax work, but a 403(b) is for the education and non-profit sectors and has some different investment options and rules.
Is the money taxed in retirement?
Yes, withdrawals are taxed as ordinary income, unless part of the plan is a Roth option that is funded with after-tax money.
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