The FSA Carryover Trap: How $680 of Rollover Can Cost You a $4,400 HSA

# The FSA Carryover Trap: How $680 of Rollover Can Cost You a $4,400 HSA There are two ways to lose money in a flexible spending account at the end of a year. Everybody knows the first one. Almost nobody sees the second one coming. ## The obvious one: forfeiture You elected $2,400. You have spent $900. It is late November, and unless something changes, $1,500 evaporates. What makes forfeiture worse than it looks is that FSA money was withheld **pre-tax**. To replace $1,500 of forfeited balance out of your own pocket you would need to earn roughly $2,000 before federal tax, FICA and state tax. The loss is not the balance; it is the balance grossed up by your marginal rate. Your employer chose one of three treatments, and they are not equivalent: - **Use it or lose it.** Nothing rolls over. The spending deadline is the last day of the plan year. - **Carryover.** Up to **$680** of a 2026 health FSA balance rolls into the 2027 plan year. Anything above that is forfeited. - **Grace period.** You get an extra 2.5 months — to **March 15** for a calendar plan year — to incur new expenses. A plan can offer carryover *or* a grace period. Never both. And a **dependent care FSA can never carry money over**, whatever the health FSA does. One more distinction that costs people real money every year: a **grace period** extends when you can *incur* expenses. A **run-out period** only extends when you can *file claims* for expenses already incurred. Plans routinely have a run-out period and no grace period, which is exactly how someone ends up believing they have until March 31 and finding out the spending deadline was December 31. ## The non-obvious one: the carryover blocks your HSA Now the expensive part. If you are planning to contribute to a health savings account next year — because you are switching to a high-deductible plan, or because you already have one — a carryover balance is not a gift. It is a problem. Being covered by a **general-purpose health FSA is disqualifying coverage for HSA contributions.** That is not a technicality about the money; it is about the coverage. If a balance carries into the next plan year, the FSA coverage continues, and you are HSA-ineligible for as long as it lasts. Typically that means the entire following plan year. The arithmetic is unkind. Protecting $680 of carryover can cost you the ability to contribute **$4,400** self-only or **$8,750** family to an HSA — plus $1,000 more if you are 55 or older. You saved the small number and lost the large one. A grace period does the same thing on a shorter clock: a general-purpose health FSA grace period blocks HSA contributions for the months it runs, usually through March 15. ## What actually fixes it **Spend the account to a $0 balance by the end of the plan year.** A zero balance ends the coverage, and HSA eligibility resumes on schedule. **Or ask whether your employer converts carryovers into a limited-purpose FSA.** A limited-purpose FSA covers only dental and vision, is not disqualifying coverage, and can run alongside an HSA at both accounts' full limits. Many plans do this automatically for employees who elect a high-deductible plan. Many do not. It is a one-email question to your benefits administrator and it is worth asking in November, not January. ## Spending it down without wasting it A December spend-down is only worth doing on care you actually need — but the eligible list is broader than most people use: - Eye exams, prescription glasses, prescription sunglasses, a year of contact lenses - Dental work you have been postponing - Over-the-counter medicine, which has been eligible without a prescription since the CARES Act - Sunscreen SPF 15+, first aid supplies, menstrual products - Durable equipment — blood pressure monitors, braces, hearing aids — which is a good use of a large leftover balance And a few that are not, no matter how medical they feel: **insurance premiums**, everyday toiletries, and cosmetic procedures. Vitamins, gym memberships and weight-loss programs sit in between — reimbursable only with a letter of medical necessity naming a diagnosed condition, obtained *before* you submit the claim. ## Get the number The [FSA forfeiture calculator](https://paystubparser.com/tools/fsa-deadline-planner) turns your election and your YTD deduction into three things: what you are on pace to forfeit, the real spend-by date for your plan's rule, and whether a carryover is about to cost you the HSA. The [eligibility checker](https://medicalbillparser.com/tools/fsa-eligible-expenses) scores a list of bills or receipts against the reimbursable list. *General information, not tax or benefits advice. Your summary plan description governs — check it for your plan's specific rule and deadlines.*