Use It or Lose It: Can You Spend FSA/HSA Money on a Bathtub Insert Before December 31?
Every fall, the same quiet panic sets in. You check your benefits portal and realize you still have a few hundred dollars, maybe more, sitting in your flexible spending account. You could stock up on bandages and sunscreen, or you could put that money toward something that actually changes daily life at home. If climbing over the side of a tub has started to feel risky for you or someone you care for, a bathtub insert that turns that tall wall into a low, walk-through step might be exactly the right use of those dollars. The catch is that eligibility depends on medical purpose, paperwork, and timing.
Is a Bathtub Insert an FSA- or HSA-Eligible Expense?
It can be. The IRS does not publish a list that says “bathtub inserts are eligible.” Instead, eligibility hinges on whether the purchase is primarily for medical care. A product that helps someone with a mobility limitation, balance disorder, arthritis, post-surgical restrictions, or fall risk bathe safely can qualify. The same product bought purely as a style upgrade does not.
Most FSA and HSA administrators treat accessibility home improvements as “eligible with a Letter of Medical Necessity (LMN).” That means your account can pay for it, but only when a licensed healthcare provider documents why you need it.
IRS Publication 502 also lists bathroom modifications among accessibility improvements that generally don’t increase a home’s value. That matters, because for capital home improvements only the cost above any added home value counts as a medical expense. For most accessibility changes, you can count the full cost.
What Is a Letter of Medical Necessity?
A Letter of Medical Necessity is a short document from your physician, physical therapist, or other qualified provider.
A strong LMN includes:
- The patient’s diagnosis or functional limitation
- A plain statement that stepping over a standard tub wall is unsafe
- The specific recommendation (for example, a walk-through bathtub insert)
- How long the need is expected to last
- The provider’s signature, credentials, and date
Request the letter before you buy. Many administrators want the LMN dated on or before the purchase, and some require pre-approval for larger expenses.
FSA vs. HSA: Who Actually Faces the December 31 Deadline?
This is where many people get confused.
Flexible Spending Accounts follow the “use it or lose it” rule. Funds you don’t spend by the end of your plan year are forfeited, unless your employer offers one of two relief options (plans can offer one, not both):
- A carryover: For 2026, the IRS allows employers to let you roll up to $680 into your 2027 plan year.
- A grace period: Up to 2.5 extra months, typically through March 15, to incur new expenses.
Health Savings Accounts have no deadline. HSA money rolls over year after year and stays with you if you change jobs. You can even pay out of pocket now and reimburse yourself from the HSA later, as long as you keep your receipts and the HSA was open when the expense occurred.
Bottom line: if you have an FSA balance, the clock is real. If you have an HSA, you can buy when it makes sense rather than racing the calendar.
Does Your Plan Year End on December 31?
Not always. Many FSAs follow the calendar year, but some run on a fiscal cycle such as July to June.
Log in to your benefits portal or check your Summary Plan Description to confirm:
- Your plan year-end date
- Whether you have a carryover or a grace period
- The “run-out” deadline for submitting claims (often 90 days after the plan year closes)
For an installed product, the expense generally must be incurred within the plan year, which usually means the date of installation, not just the order date. Schedule early, because bathroom contractors book up quickly before the holidays.
Which Account Types Won’t Work?
Two account types are typically off the table for accessibility upgrades:
- Limited-Purpose FSAs, which usually cover only dental and vision expenses
- Dependent Care FSAs, which cover childcare and eldercare services, not home modifications
Look at a standard health FSA, an HSA, or a Health Reimbursement Arrangement (HRA).
Why Choose an Insert Over a Full Remodel?
A full bathroom remodel can run thousands of dollars and take weeks. Many families looking for a fast, affordable safety fix choose a tub-to-shower conversion kit instead. These inserts fit over the existing tub wall, creating a low step-in entry while keeping the tub’s plumbing, surround, and footprint in place.
For year-end FSA planning, that speed is a genuine advantage. Installation often takes hours, not days, so you can complete the expense before your plan year closes. Inserts also tend to fall closer to a typical FSA balance, so you don’t have to fund a large remodel out of pocket.
Your Year-End Checklist
- Check your balance and plan deadline today.
- Book a provider visit and request a Letter of Medical Necessity.
- Confirm eligibility with your FSA or HSA administrator, and ask about pre-approval.
- Order and schedule installation so it is completed before your deadline.
- Keep everything: itemized invoice, proof of payment, installation date, and the LMN.
- Submit your claim or pay directly with your benefits card, then file the documentation.
Frequently Asked Questions
Can I use my FSA debit card to buy a bathtub insert? Sometimes. Because these purchases need an LMN, the card transaction may be flagged for substantiation. Be ready to upload your letter and itemized receipt.
Does a doctor’s note guarantee approval? No. The final decision belongs to your plan administrator. A detailed, specific LMN greatly improves your odds.
Can I buy it for a parent? Only if that parent is your tax dependent. Otherwise, your FSA or HSA cannot cover their expenses.
What if I miss December 31? Check whether your plan offers a grace period or carryover. If you have an HSA, you don’t have a deadline to worry about.
Year-end FSA dollars don’t have to disappear into a drawer full of drugstore extras. With a Letter of Medical Necessity, the right account, and a little planning, a bathtub insert can turn expiring funds into a safer bathroom that lasts for years. Start the paperwork now and get the installation on the calendar before your deadline.
This article is for general information only and isn’t tax, legal, or medical advice. Confirm eligibility with your plan administrator and a qualified tax professional.