Can You Have an FSA and an HSA at the Same Time?

Short answer: Yes, you can have an FSA and an HSA in the same year — but only if that FSA is a "limited-purpose" FSA restricted to dental and vision costs. Pair a general-purpose healthcare FSA with an HSA and you'll usually lose your HSA eligibility for the year.

If you've ever stared at your open enrollment paperwork wondering whether you're allowed to stack these two accounts, you're not alone — it's one of the most-asked benefits questions every fall. Here's the plain-English version, plus what it actually means if you're planning to use pre-tax dollars toward a red light therapy device.

Can you have an FSA and an HSA at the same time?

Only if the FSA is "limited-purpose." A Health Savings Account (HSA) requires you to be enrolled in a qualifying high-deductible health plan and to have no other general-purpose health coverage — and a standard healthcare FSA counts as exactly that kind of coverage. Pair the two and the IRS generally treats you as ineligible to contribute to your HSA for any month you also had the general FSA. The workaround millions of people use is a limited-purpose FSA (LPFSA), which is narrow enough that it doesn't conflict with HSA rules.

What is a limited-purpose FSA (LPFSA)?

An LPFSA is a special version of a flexible spending account that only reimburses dental and vision expenses, and sometimes certain preventive care — cleanings, fillings, orthodontia, eye exams, glasses, contacts, and similar costs. Because it doesn't touch general medical expenses, it doesn't overlap with what your HSA is meant to cover, which is exactly what keeps your HSA contributions valid. Think of it as a separate lane for predictable dental and vision bills, while your HSA stays open for everything else — including bigger, less predictable health costs down the road.

What happens if you accidentally have both a general FSA and an HSA?

If this happens — often because of a job change, a spouse's open enrollment, or a plan that wasn't clearly labeled — talk to your HR or benefits team right away. Depending on the timing, you may need to stop HSA contributions, adjust your election, or in some cases correct an excess contribution before tax season. It's a fixable situation, but it's much easier to fix quickly than after a full year has gone by. If your employer offers both types of FSA, always double-check which one is attached to your plan before you enroll.

Does a limited-purpose FSA cover red light therapy?

No — an LPFSA is capped at dental, vision, and sometimes preventive care, so a red light therapy panel, mask, or wearable isn't an eligible LPFSA expense. That's where your HSA comes in: red light therapy devices are widely sold as FSA/HSA-eligible items, and if dental and vision are already covered by your LPFSA, your HSA dollars are freed up for a device like this instead of competing with orthodontia bills for the same pot of pre-tax money. You can browse everything that qualifies in our FSA/HSA-eligible collection, or take our 60-second device finder quiz if you're not sure which one fits your routine.

What does the research say about red light therapy itself?

Red light therapy — also called photobiomodulation — uses low-level red and near-infrared light, and researchers believe it works in part by supporting mitochondrial energy production in cells, which may help calm inflammation and support recovery. A 2025 umbrella review pooling more than 200 randomized trials found moderate-certainty evidence for benefits in a few specific areas, like disability improvement in knee osteoarthritis and fatigue reduction in fibromyalgia, while noting that evidence for many other conditions is still low-to-moderate certainty and needs more standardized research. A separate systematic review focused on fibromyalgia found that whole-body treatment tended to outperform smaller, localized sessions for symptom relief. None of this makes red light therapy a cure — it's best understood as a wellness tool you use alongside, not instead of, guidance from your own healthcare provider.

Frequently asked questions

Is a limited-purpose FSA worth it if I already have an HSA?

For most people with predictable dental or vision costs, yes — it lets you pay those with pre-tax money without touching your HSA, so your HSA balance stays available for other medical expenses or long-term savings.

Can I switch from a general FSA to a limited-purpose FSA mid-year?

Usually only during open enrollment or after a qualifying life event, since FSA elections are locked in for the plan year in most cases — check with your benefits administrator for your plan's specific rules.

What's the FSA contribution limit for 2026?

Health FSAs and limited-purpose FSAs generally share the same IRS contribution cap, which moved up modestly for 2026 — your plan documents or HR team will have the exact number that applies to you.

Can my spouse have a general FSA while I contribute to my HSA?

This is a common trip-up: if your spouse's general-purpose FSA can reimburse your medical expenses too, it can affect your own HSA eligibility, even though the accounts are technically separate. It's worth confirming the details with your benefits team before you assume you're in the clear.

Is red light therapy FSA or HSA eligible?

Many red light therapy devices, including AWA's panels, masks, and wearables, are sold as FSA/HSA-eligible items. A limited-purpose FSA won't cover them, but a standard FSA or an HSA typically will — always confirm current eligibility at checkout or with your plan administrator.

What if I'm not sure which type of FSA I have?

Check your plan's summary of benefits or ask HR directly — "limited-purpose," "general-purpose," and "dependent care" FSAs all look similar on paper but work very differently.

However your accounts are set up, the goal is the same: don't leave pre-tax money on the table, and don't let paperwork confusion slow you down. Our full guide to paying for red light therapy with FSA or HSA funds walks through the checkout process step by step if you want more detail.

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.