The double-stacking opportunity is real and often underused simply because people don't realize the second account is available. A 403(b) works much like a 401(k), pre-tax or Roth employee contributions, often with an employer match, subject to the standard 2026 limit of $24,500 (plus a $8,000 catch-up at 50+, or $11,250 for those 60-63). A 457(b) deferred compensation plan offered by the same nonprofit employer has its own, entirely independent $24,500 limit (plus its own catch-up provisions), meaning the two accounts don't share a combined ceiling the way, for example, multiple 401(k)s from different employers in the same year generally do.

The critical distinction almost nobody checks is whether their 457(b) is governmental or non-governmental. A governmental 457(b), typically offered by a public university or government agency, holds assets in a trust protected from the employer's creditors and generally allows a rollover to an IRA or another qualified plan at separation, functioning much like a 401(k) in practice. A non-governmental, or 'top-hat,' 457(b), the type almost universally offered by private nonprofit hospital systems, works very differently: it must remain legally unfunded, meaning the money is still the employer's asset and is exposed to the employer's general creditors in the event of bankruptcy or major litigation, and it's typically limited to management and highly compensated employees, physicians and senior administrators in a hospital setting, rather than all staff.

A non-governmental 457(b) balance generally cannot be rolled over into an IRA, a 401(k), a 403(b), or another 457(b) plan when you leave the employer. Instead, the balance pays out according to the distribution schedule you elected, often years earlier, when you first enrolled, sometimes as a lump sum, sometimes as installments over a set number of years. That original election is often difficult or impossible to change later, which means the tax-bracket impact of the eventual payout deserves real thought at the time of enrollment, not just when the money is about to arrive.

Non-governmental 457(b) plans also lack several features governmental plans and 401(k)s take for granted: no Roth option, no plan loans, and no in-service withdrawals after age 59½ the way a governmental plan or 401(k) sometimes allows. The tradeoff for the extra tax-deferred space is less flexibility and more counterparty risk, not just a straightforward doubling of the usual 403(b) benefit.

Because the plan's assets are exposed to the employer's general creditors, the financial health of the specific health system matters in a way it simply doesn't for a 401(k) or 403(b), where your account is legally segregated from the employer regardless of its financial condition. This is worth periodically reassessing rather than treating the 457(b) balance as equivalently safe to the rest of a retirement portfolio.

Some hospital systems, Mayo Clinic among them, also offer a traditional pension alongside these deferred-compensation options, which introduces its own decision: whether a monthly annuity or a lump-sum payout makes more sense at retirement, a decision with the same tax mechanics, mandatory 20% withholding on a distribution paid directly rather than trustee-to-trustee, that apply to any employer plan lump sum.

For most hospital and nonprofit employees, the sensible order is to capture any 403(b) employer match first, then fund the 457(b) to the extent cash flow allows given its distribution constraints, then consider an HSA if enrolled in a qualifying high-deductible health plan, and finally a backdoor Roth IRA or taxable brokerage account once the tax-advantaged options are exhausted.

If you work for Mayo Clinic, Banner Health, HonorHealth, or a similar nonprofit health system and have access to a 457(b), confirm in writing whether it's governmental or non-governmental before funding it heavily, the answer changes both your risk exposure and your options when you eventually leave or retire.

If you already have a non-governmental 457(b) balance building up, revisit your original distribution election periodically as your expected retirement date and tax situation evolve, and factor the employer's financial stability into how much of your total retirement savings you're comfortable holding in an account that isn't legally protected the way a 401(k) or 403(b) is.

• Assuming a hospital-system 457(b) can be rolled into an IRA at separation the way a 403(b) can. Non-governmental 457(b) plans generally cannot be rolled over at all.
• Not confirming whether a 457(b) is governmental or non-governmental before funding it, and therefore not understanding the creditor exposure involved.
• Treating the 403(b) and 457(b) as sharing one combined contribution limit, when they're independent for most nonprofit-employer situations.
• Locking in a 457(b) distribution election at enrollment without considering what tax bracket that payout will land in years or decades later.
• Ignoring the sponsoring organization's financial health as a risk factor for an unfunded, non-governmental 457(b) balance.