Workers may direct as much as $3,400 of salary into a health flexible spending arrangement for a plan year beginning in 2026, while a plan that offers carryover may let as much as $680 survive into the following year. The two figures are federal ceilings, not promises from every employer. A participant can elect the full contribution and still lose unused money if the plan offers a grace period instead of carryover, offers neither feature, or sets a smaller carryover limit.
The 2026 limits govern two different decisions
The IRS inflation adjustments for 2026 raise the employee salary-reduction ceiling to $3,400 for health FSAs. That is the most a worker may elect through payroll under the federal rule for the plan year. Employer contributions can be treated differently under cafeteria-plan rules, so the election limit should not be confused with every dollar that might appear in the account.
The current IRS adjustment notice makes the $680 figure about money left over, not additional money entering the account. A cafeteria plan that adopts a carryover can permit up to $680 of unused 2026 health-FSA funds to pay or reimburse eligible expenses in the next plan year. The employer can choose a lower ceiling. Federal law does not require a carryover, so benefits materials control whether any amount survives. The election and carryover limits must therefore be read separately.
A plan generally may offer either a carryover or a grace period, not both. The grace period can extend the time to incur eligible expenses by as much as two and a half months after the plan year ends. A run-out period is different: it may allow extra time to submit claims for expenses incurred before the plan year’s deadline. Mixing up those dates is how participants lose money even after receiving a reminder from the plan.
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Tax savings compete with the use-it-or-lose-it risk
Health-FSA salary reductions generally avoid federal income and payroll taxes, making a dollar used for an eligible expense cheaper than a dollar paid from after-tax wages. The actual saving depends on the participant’s marginal income-tax and payroll-tax exposure. A $3,400 election is not a $3,400 tax credit; it is compensation redirected before specified taxes are calculated.
The account can reimburse qualified medical expenses for the employee, spouse and eligible dependents under plan rules. Unlike an HSA, the full annual election is commonly available near the start of the plan year even though payroll contributions arrive over time. That front-loaded access can help with a planned procedure, while job departure and continuation rules can complicate later claims. The plan’s summary description governs the operational details.
Overfunding remains the central risk because a health FSA is generally use-it-or-lose-it. Current IRS guidance on health FSAs explains that unused balances normally cannot return to the employee. A participant forecasting expenses should therefore separate predictable costs—regular prescriptions, copays, dental work and scheduled vision care—from speculative spending rather than choosing the maximum solely for the tax break.
The employer’s deadline sheet matters more than the federal headline
Two employers can apply the same $3,400 federal ceiling and deliver very different outcomes. One may allow the full indexed carryover, another a smaller amount, and a third a grace period with no carryover. Eligible-expense substantiation, claim submission deadlines and debit-card procedures can also differ. Open-enrollment materials should show all of those features before an election becomes irrevocable for the plan year.
Coordination becomes especially important when a household also uses an HSA. A general-purpose health FSA that can reimburse an HSA contributor’s medical expenses generally interferes with HSA eligibility, even when the FSA belongs to the contributor’s spouse. Limited-purpose or post-deductible FSAs can be designed to coexist with HSAs, but the exact plan language must establish that narrower scope.
A midyear election change normally requires a permitted change in status or another event recognized by the plan and cafeteria-plan rules. The annual election is therefore a commitment made with incomplete information about illness and treatment. IRS employer-benefit guidance places health FSAs inside the employer’s cafeteria plan, which is why an insurer’s medical-coverage change does not by itself guarantee that the FSA election can be rewritten on demand.
Termination of employment can create a compressed spending window. Depending on plan terms and continuation rights, expenses incurred after coverage ends may not be reimbursable even when contributions made earlier in the year remain unused. A worker considering a job change should identify the last eligible service date, the claim-submission deadline and any COBRA option before assuming the balance follows to the next employer. Health FSAs are employer-plan benefits, not portable individual accounts like HSAs.
The 2026 increase offers another $100 of pretax contribution room and another $20 of potential carryover compared with 2025. Those modest increases reward precision more than ambition. The best election is the amount matched to eligible expenses under the employer’s own timing rules, because the federal ceiling creates capacity while the plan document decides whether the last unused dollar becomes next year’s medical money or an irreversible forfeiture.
This article was produced with AI assistance and reviewed by The Money Overview editorial team.
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