A health Flexible Spending Account (FSA) is usually “use it or lose it.” Your employer’s plan may soften that with a grace period, a carryover, or neither. Those two safety valves are different calendars, and IRS plan-design rules generally stop a health FSA from offering both a full grace period and a carryover at once. Guessing which one you have is how people forfeit hundreds of dollars in March.
Account contrast first: HSA and FSA basics. Full FSA rule map: Understanding flexible spending account rules.
Grace period vs carryover vs run-out
| Feature | What it does | Calendar cue |
|---|---|---|
| Grace period | Extra weeks (often ~2.5 months) after plan year-end to incur prior-year eligible expenses (what qualifies) | Last day to get care / buy eligible items |
| Carryover | Limited dollar amount rolls into the next plan year (FSA carryover) | Cap published for that year; excess still at risk |
| Run-out period | Time after year-end to submit claims for expenses already incurred | Portal deadline ≠ grace end date |
Administrators you will see on cards and portals include HealthEquity, WEX, Fidelity benefits sites, and employer HR tools. The summary plan description (SPD) beats Slack folklore.
Dependent care FSAs follow different timing; do not assume health-FSA grace/carryover language applies (see Dependent care FSA and Using an FSA for dependent care).
How to read your plan in five minutes
- Open the benefits portal → FSA → plan documents / SPD.
- Search for “grace period,” “carryover,” and “run-out.”
- Write three dates: last day to incur, last day to submit, and whether a carryover cap exists.
- If the PDF is silent, email HR with those three questions in writing, not a hallway chat.
Open enrollment is when you set next year’s election with this year’s leftover rules in mind (Health insurance open enrollment).
Worked example: $740 left on December 10
Jordan has $740 left in a 2026 health FSA.
| Plan design | Smart move | Risk if wrong |
|---|---|---|
| Grace through mid-March | Book eligible dental/vision in January if December is packed; still submit before run-out | Assuming carryover and spending nothing → forfeit |
| Carryover (illustrative cap $640) | Spend at least ~$100 of eligible expenses by Dec 31 so only the cap rolls | Hoping for a grace period the plan does not offer |
| Neither | Spend down with eligible OTC, glasses, or scheduled care before Dec 31 | “I’ll figure it out in February” |
Jordan buys prescription glasses and schedules a cleaning that qualifies under IRS Publication 502-style lists, keeps itemized receipts, and pairs big deductible timing with Health insurance deductibles.
Eligible spend cues (not a complete list)
Common fits: deductibles, copays, coinsurance, many prescriptions, eligible dental/vision. Card swipes alone can fail audit, keep EOBs and itemized receipts. Filing season may show W-2 benefit nuances; orientation only in Filing taxes for beginners.
Mid-year job change can cut off new FSA access even when prior-year claims are still running, confirm run-out with HR on your last day.
Checklist
- Confirm whether your health FSA has grace, carryover, or neither, from the SPD.
- Calendar incur deadline and submit (run-out) deadline separately.
- From November on, check the balance weekly.
- Spend to the rule you actually have; do not mix grace and carryover myths.
- Keep receipts; portal memos are not enough for every audit.
- Read dependent care FSA rules on their own page if you have both accounts.
Educational only. Not tax, legal, or benefits advice. IRS limits, carryover caps, and plan designs change by year and employer; verify with your plan administrator and current IRS Publications 502/969 guidance.