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ARTICLE 4
Why an FSA?
2026 Contribution Limit
You can contribute up to
$3,400
to a health FSA in 2026.
View plan rules
What is a Health FSA?
The Potential Tax Advantage
Your Decision Matters
When Your Money is Available
The Tradeoff: Unused Funds Matter
Key FSA Terms
Before You Make a Decision
Official Resources
Plan Rules & Changes
Updated for the 2026 plan year
The FSA Rules That Can Change Your Decision
Understand contribution limits, employer rules, carryover and grace periods, and changes that may affect your FSA.
Federal tax rules establish the basic framework for health FSAs.
But your employer establishes the FSA plan you actually participate in.
That means two employees at different companies can face different practical rules even though both benefits are health FSAs.
The federal contribution limit
For plan years beginning in 2026, an employee may elect up to $3,400 in salary-reduction contributions to a health FSA under the federal limit.
This limit is indexed and can change from year to year.
An employer's plan must comply with the federal ceiling but may contain additional terms affecting what a participant can elect or receive.
Your employer's plan matters
Before choosing a contribution, check your actual plan materials for matters such as:
the applicable plan year;
your permitted election amount;
employer contributions, if any;
eligible-expense provisions;
carryover availability and amount;
whether a grace period applies;
claims and reimbursement procedures;
applicable deadlines;
rules governing election changes.
Do not assume another employer's FSA works exactly like yours
Carryover
Federal rules permit—but do not require—a health FSA plan to allow a limited amount of unused funds to carry into the following plan year.
For 2026, the maximum federally permitted carryover is $680. A plan may permit less than that amount, and a plan does not have to offer carryover at all. Carryover also does not reduce the following year's federal salary-reduction contribution limit.
So if you see “$680 carryover,” do not automatically assume that is what your plan provides.
Verify it.
Grace period
Instead of carryover, a health FSA may provide a grace period of up to 2½ months following the end of the plan year.
Eligible remaining funds can then reimburse qualifying medical expenses incurred during that grace period.
A health FSA generally cannot provide both a carryover and a grace period for the same plan year.
These features matter because they change the consequences of finishing the plan year with unused funds.
Election changes during the year
Your FSA election generally is made before or at the beginning of the plan year and cannot simply be changed whenever your spending forecast changes.
IRS guidance states that an election may be changed or revoked only when specifically permitted by law and the plan.
Therefore:
A change in your Calcumetic estimate does not necessarily mean you are permitted to change your FSA election.
If circumstances change after enrollment, consult your plan materials or administrator to determine whether an election change is available.
FSA and HSA interaction deserves special attention
A general-purpose health FSA can affect eligibility to contribute to a Health Savings Account.
IRS rules contain particular provisions for arrangements such as limited-purpose and post-deductible FSAs, and even FSA grace-period coverage can matter to HSA eligibility in some circumstances.
If you have—or expect to contribute to—an HSA, do not assume that ordinary health-FSA participation is compatible with your HSA strategy. Review your benefit structure and, where necessary, obtain appropriate tax or benefits guidance.
Rules can change from year to year
Federal contribution and carryover limits are indexed periodically. Employers can also amend plan terms subject to applicable law.
For that reason, a plan rule that was correct last year should not automatically be treated as correct this year.
Before making each annual election, verify the current rules for the specific plan year and specific employer plan involved.
The Calcumetic principle
Calcumetic can help you evaluate a contribution using the information you provide.
It does not determine your employer's plan terms for you.
When a plan-specific fact matters—such as your carryover provision, grace period, or permitted contribution—your employer's current plan materials or administrator are the authoritative source for your plan.
That division is deliberate:
Calcumetic helps with the decision. Your employer's plan determines the rules under which that decision operates.
Set aside pre-tax dollars
Pay for eligible healthcare expenses
Lower your taxable income
Get reimbursed tax-free for qualifying expenses
Did you know?
For 2026, plans that allow a carryover can let you carry over up to $680 of unused funds into the next plan year.
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Understand how an FSA works, its tax advantages, and what to know before choosing your contribution
