Workers who set aside pretax dollars in a health flexible spending account face a familiar year-end risk: any money they did not spend can disappear. The IRS has now confirmed that for tax years beginning in 2026, the salary-reduction cap for health FSAs rises to $3,400, a $100 bump from 2025. Plans that allow a carryover of unspent funds can let participants roll over up to $680, an increase of $20. Those numbers may look modest, but the stakes are real for anyone who misjudges their medical spending and leaves money on the table.
How the $3,400 cap and $680 carryover change the math
Health FSAs operate under a “use-it-or-lose-it” structure, as the IRS explains in its FSA guidance. Employees elect a dollar amount at the start of the plan year, and that money is deducted from their paychecks before taxes. If they do not spend it on eligible medical expenses by the plan deadline, the leftover balance is forfeited. The forfeited dollars do not return to the worker; they revert to the employer and can be used only in limited ways, such as offsetting plan administrative costs.
Two safety valves exist, but neither is guaranteed. An employer’s plan may offer a grace period of up to two and a half extra months to use remaining funds. Alternatively, a plan may permit a capped carryover of unused amounts into the following year. A plan cannot offer both features at once. And many employers offer neither, leaving participants fully exposed to the forfeiture rule and making careful election decisions even more important.
The IRS originally set the carryover ceiling at $500 when it introduced the option. That figure has since been indexed to inflation. For 2026, the agency’s inflation adjustment tables place the maximum permitted carryover at $680. Any unused balance above $680 in a carryover-eligible plan is still forfeited. In a plan with no carryover or grace period, every unspent dollar is lost, regardless of how close the remaining amount is to the annual cap.
Whether a $100 increase shifts enrollment behavior
A key question is whether these small annual increases, $100 on the contribution cap and $20 on the carryover, change how workers approach FSA elections. The idea that mid-income employees who previously maxed out at lower limits will now rush to adjust their elections mid-year does not align with how most plans work. FSA elections are typically locked at the start of a plan year and can only be changed during a qualifying life event such as marriage, birth of a child, or loss of other coverage. A $100 increase alone does not trigger a qualifying event under standard plan documents.
What the higher cap does affect is the next open enrollment window. Workers planning for 2026 can now shelter an additional $100 from federal income and payroll taxes. For someone in the 22 percent federal bracket, that translates to roughly $22 in additional federal income tax savings, plus a smaller reduction in Social Security and Medicare taxes. That amount is meaningful but unlikely by itself to reshape broad enrollment patterns or convince nonparticipants to join.
The real financial danger remains unchanged: overestimating medical expenses and forfeiting the surplus. For employees who consistently spend close to their current elections, the new cap may simply formalize what they were already doing. For others, especially those whose medical costs fluctuate, the priority remains building a conservative estimate that balances tax savings against the risk of losing money at year’s end.
Open questions about employer plan design for 2026
The IRS sets the outer boundaries, but individual employers decide whether to adopt a carryover, a grace period, or neither. The 2026 adjustments do not force any change in plan design; they merely expand the options available. Employers that already allow the maximum carryover will need to update plan documents and communications to reflect the new $680 ceiling. Those that have never adopted a carryover may revisit the question as forfeitures grow more visible to employees and regulators.
Formal details of the 2026 limits appear in IRS administrative materials, including the Internal Revenue Bulletin that compiles annual inflation adjustments. Employers and benefits administrators rely on that bulletin to confirm the precise dollar amounts and effective dates before amending their plans. Because the rules are technical, many workers will first hear about the new limits through HR summaries or enrollment guides rather than directly from the IRS.
For employees who want to verify figures or ask questions about how the new cap interacts with their own situation, the agency’s online account portal can provide access to tax transcripts and payment histories, though it does not replace employer plan documents. Ultimately, the most practical step for workers heading into 2026 is to review prior-year medical spending, check whether their plan offers a carryover or grace period, and set an election that captures tax savings without relying on every dollar being spent. The higher cap and carryover slightly expand the room for error, but they do not eliminate the fundamental trade-off at the heart of health FSAs.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
