Can You Use Your FSA or HSA for a Partner You're Not Married To?

Short answer: usually not. The IRS only lets your FSA or HSA pay for your own medical expenses, your spouse's, or a tax dependent's — and most boyfriends, girlfriends, and domestic partners don't meet that bar unless they pass a specific "qualifying relative" test. Here's exactly how that test works, what happens if you swipe the card for them anyway, and how couples can still get red light therapy on pre-tax terms.

If you and a partner live together and split expenses but aren't married, this question comes up constantly around open enrollment — and around gift-giving season, when one partner wants to buy the other an FSA/HSA-eligible red light therapy panel or mask. The rule is narrower than most people expect.

Does a Girlfriend, Boyfriend, or Domestic Partner Count as a "Dependent"?

Not automatically. The IRS defines whose medical expenses your FSA or HSA can cover as: you, your spouse, and anyone you claim as a tax dependent. A partner you're not married to isn't a spouse, and being in a relationship — even a long, serious, cohabiting one — doesn't make someone your dependent. The only way a partner qualifies is if they pass what the IRS calls the "qualifying relative" test.

What Is the "Qualifying Relative" Test, and Could Your Partner Pass It?

The test has three parts, and a partner has to clear all three:

• Household member test. They lived with you the entire year as a member of your household, and the relationship doesn't violate local law.
• Support test. You provided more than half of their total financial support for the year — housing, food, medical care, and other living expenses.
• Gross income test. Their own gross income stayed under the IRS threshold for the tax year (a figure the IRS updates annually — check the current-year limit in IRS Publication 502 before you rely on it).

If your partner has their own income, a job, or their own place they're contributing to, they almost certainly fail the support test or the income test — which is most couples. This test was built for someone you're financially supporting outright, not someone you're splitting rent with.

What Happens If You Use FSA/HSA Funds for a Partner Who Doesn't Qualify?

If you buy something for a partner who isn't your dependent, the IRS treats that as a non-qualified distribution. For an HSA, that means the amount becomes taxable income, plus a 20% penalty on top (the penalty doesn't apply after age 65, but the tax still does). For an FSA, using the card for someone who doesn't qualify is a plan violation your administrator can flag, and you may have to repay the plan directly. Neither outcome is worth the risk for a purchase this size — it's worth getting the rule right before you tap the card.

Can You Just Add Your Partner to Your Health Plan Instead?

Sometimes, but that's a separate question from FSA/HSA eligibility. Some employers offer domestic partner benefits that let you add a partner to your health insurance. Being on your insurance plan is not the same as being your tax dependent, though — you can cover their doctor visits under your insurance while still being unable to pay for their red light therapy device with your FSA or HSA card, unless they also separately meet the dependent test above. If this matters to you, it's worth asking your benefits administrator or a tax professional how your specific plan and situation line up, since the two systems (insurance eligibility and tax dependency) don't automatically match.

How Can Couples Still Use Pre-Tax Money for Red Light Therapy Together?

You have a few straightforward, fully compliant options:

• Buy it for yourself, share the room. If you purchase an FSA/HSA-eligible device for your own therapeutic use, nothing stops your partner from also benefiting when you use it together at home — the eligibility rule is about whose account pays and whose medical need it's for, not who's in the room.
• Each partner uses their own account. If you both have FSA or HSA funds, you can each buy your own device with your own pre-tax dollars. Our guide to using your FSA or HSA at AWA walks through how the checkout process works.
• Gift it with after-tax money. You can always buy a partner a red light therapy device as a regular gift using a normal debit or credit card — you just can't run that purchase through your own pre-tax FSA or HSA account on their behalf unless they meet the dependent test.
• Check for a Letter of Medical Necessity angle — for yourself. If a provider recommends red light therapy for your own condition, an LMN can support your own claim, but it doesn't extend your account's reach to a non-dependent partner.

If you're not sure which device makes sense for two people sharing a routine, our device finder quiz can help you narrow it down in under a minute.

What Does the Research Say About Red Light Therapy Itself?

Separate from the tax question, it's worth knowing what red light therapy (photobiomodulation) is actually studied for. A 2026 systematic review in Frontiers in Integrative Neuroscience looked at 14 randomized controlled trials across conditions like fibromyalgia, peripheral neuropathy, and temporomandibular disorders, and found that most trials reported meaningful pain reduction with a favorable safety profile — while the authors also cautioned that inconsistent protocols across studies limit how strong the conclusions can be. A broader 2025 umbrella review in Systematic Reviews, covering 204 randomized trials across 15 conditions, found moderate-certainty evidence supporting benefits for things like knee osteoarthritis disability and fibromyalgia-related fatigue, while noting that evidence for many other endpoints is still low-to-moderate and that more standardized, high-quality trials are needed. In plain terms: research supports red light therapy as a promising wellness adjunct for certain conditions, not a guaranteed fix, and it's reasonable for a couple to want to build a home routine around it either way.

Frequently Asked Questions

Can I use my HSA to buy red light therapy for my fiancé?

Being engaged doesn't change anything for tax purposes — an FSA or HSA only recognizes legal spouses and qualifying dependents, not fiancés, regardless of how committed the relationship is.

What if we have a domestic partnership registered with our city or state?

A registered domestic partnership can affect things like employer benefits eligibility, but it doesn't automatically make someone a federal tax dependent. The IRS qualifying relative test still applies the same way.

Can my partner use their own HSA to buy something for me?

The same rule runs both directions — their HSA can only pay for their own expenses, your spouse's, or their own tax dependents. If you're not their dependent, their account can't pay for your device either.

Does it matter if we file taxes jointly?

Unmarried couples can't file a joint tax return, so this doesn't apply. Only legally married spouses can file jointly, which is part of why marital status matters so much here.

What if my partner has no income at all?

Having little or no income helps clear the gross income test, but you'd still need to show you provided more than half their support and that they lived with you all year. If that's genuinely your situation, a tax professional can help you confirm dependent status before you rely on it.

Is it still worth buying an FSA/HSA-eligible device if only one of us can use pre-tax funds?

Often, yes. One partner buying an eligible device with their own FSA or HSA still stretches a household's overall budget further than paying full price with after-tax money, even if only one account is doing the work.

Lights on, pain off.

This article is for general education and is not medical advice. Red light therapy devices are intended for general wellness and are not intended to diagnose, treat, cure, or prevent any disease. Always check with a qualified healthcare provider before starting a new therapy.