9 Best Red Light Therapy Devices (That Are Also HSA/FSA Eligible)
Compare the 9 best red light therapy devices, their benefits, and how to determine if you're eligible to buy RLT devices using your HSA or FSA funds.
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News, insights and more from Flex
How To Make the Most of HSA Catch-Up Contributions
Learn what HSA catch-up contributions are, how they work, and how you can leverage them to maximize your healthcare funds and save on medical expenses.
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More Articles
Is Melatonin HSA/FSA Eligible? (& Where to Buy It)
Learn when melatonin can be HSA/FSA eligible, why an LMN is typically needed, what makes it eligible, how to qualify, and how to purchase it conveniently.
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8 Best Super Greens Powders (That Are Also HSA/FSA Eligible)
Learn how super greens powder works, tips to get the best results, and compare the leading super greens powders so you can find the right fit for you.
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10 Best Period Underwear (That Are Also HSA/FSA Eligible)
Compare the 10 best period underwear, their health and cost benefits, and how to determine if you’re eligible to buy them using your HSA or FSA funds.
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Is Toothpaste HSA or FSA Eligible? (And How to Buy It)
Understand why toothpaste doesn’t automatically qualify as HSA or FSA eligible, and what qualifying conditions and documentation can make it eligible.
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The Flex Shopify Marketing App: Product Eligibility Sync, Dynamic Badges, Smart Collections & HSA/FSA Landing Pages
The rebuilt Flex Shopify Marketing App syncs HSA/FSA product eligibility from Flex to the Shopify admin, adds dynamic product badges, and lets you build a dedicated HSA/FSA landing page from pre-built blocks—no custom development needed.
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Shop Pay “Pay Another Way”: A Faster Path to HSA/FSA Checkout on Shopify
Shop Pay quietly added a “Pay another way” option that lets logged-in shoppers check out with their HSA/FSA card through Flex—without dropping to a blank guest checkout. Here’s what changed and what Shopify merchants should do.
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MCP Use Cases: How We Built a Custom MCP Server for a Non-Technical Merchant
A real MCP use case: how Flex built a custom MCP server so a non-technical merchant could manage subscriptions and payments by chatting with an AI, with no API, no dashboard, and no support tickets.
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The Letter of Medical Necessity Problem: Why Your Customers Can’t Get Reimbursed, and How Flex Fixes It
For most HSA/FSA purchases, customers pay out of pocket and have to file a reimbursement claim afterward —and that's where the experience breaks down. Flex now lets your customers file that claim, with their Letter of Medical Necessity, directly inside the Flex Consumer Portal.
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IRS Raises 2027 HSA Contribution Limits to $4,500 and $9,000
The IRS raised 2027 HSA contribution limits to $4,500 (self-only) and $9,000 (family), up from $4,400 and $8,750. Here are the full 2027 HSA and HDHP limits, the age-55 catch-up, and what changed under the One Big Beautiful Bill Act.
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Introducing Flex MCP: Connect Your AI Assistant Directly to Flex
Flex MCP is a new MCP server that connects AI assistants like Claude, Cursor, Codex, and Windsurf directly to your Flex account, so you can look up orders, reconcile payments, manage billing, and run reports without leaving your coding or productivity tools.
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What Is a Lifestyle Spending Account (LSA)? A Guide to LSA Benefits, Eligible Expenses, and How LSAs Work With Your HSA/FSA
Lifestyle Spending Accounts (LSAs) are one of the most flexible employer benefits on the market. Here's what an LSA covers, how it compares to an HSA or FSA, and how to stack all three to maximize your pre-tax savings on wellness.
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Rules for Claiming HSA Expenses from Previous Years
Find out how you can claim HSA expenses from previous years, including what the rules are and how reimbursements work when withdrawing funds for purchases.
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Using Your HSA/FSA for Fertility Treatments & Devices
Learn which fertility treatments, tests, and monitors are HSA/FSA eligible and how to easily buy approved products using your benefits funds online today.
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How & Where To Buy HSA/FSA Approved Shoes for Women
Find out when women’s shoes are HSA and FSA eligible, why a Letter of Medical Necessity (LMN) is almost always required, and how to buy them conveniently.
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Complete List of 220+ FSA Eligible Items & Expenses
We’ve compiled a list of over 200 FSA eligible items, and explained when each item is always eligible, or eligible with a Letter of Medical Necessity.
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HSA Contribution Deadline: When It Is & How It Works
Find out precisely what the HSA contribution deadline is, when it is, and how it works so you can maximize your tax-advantaged dollars and avoid penalties.
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From Capitol Hill to Your Wallet: Advocacy for Your Benefit
Learn about key HSA/FSA policy proposals, including HSA modernization, caregiver support, and higher DCFSA limits—and how you can advocate for change.
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HSA/FSA Eligibility for Mattresses: What Mattress Brands Need to Know
Learn when mattresses qualify for HSA/FSA spending, including IRS rules, Revenue Ruling 55-261, and why a Letter of Medical Necessity is required.
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What makes a product or service an IRS qualified HSA/FSA expense?
Learn what makes a product or service a qualified HSA/FSA expense under IRS rules, including IRC § 213(d), Publication 502, and eligibility categories.
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The Flex AI Investigation Agent for HSA/FSA Payments
We built a Slack agent that can trace a transaction end to end—and, when it finds a bug, open a pull request with a proposed fix.
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Where & How To Buy HSA/FSA Eligible Period Underwear
Learn whether period underwear is HSA or FSA eligible, when you may need an LMN, and how to purchase qualifying products using your healthcare benefits.
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Are Pads HSA/FSA Eligible & Where Can You Buy Them?
Learn when and why menstrual pads are HSA and FSA eligible, which period products qualify, and how and where to buy pads using your HSA or FSA online.
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HSA Reimbursement Rules, Timelines, & How It Works
Learn how HSA reimbursement rules work, including timelines and time limits, eligibility, examples, and when and how to reimburse yourself from your HSA.
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HSA Withdrawal Rules, Taxes, and How To Do It Properly
We go over the HSA withdrawal rules, including when withdrawals are taxable, how to avoid penalties, and how to withdraw funds properly from your HSA.
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A Guide To HSA and Medicare Contributions & Eligibility
Learn how HSA eligibility works with Medicare, when contributions must stop, potential penalties, & how to use your HSA funds after enrolling in Medicare.
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HSA Family Coverage Rules: Spouses, Friends, Dependents
Learn the HSA family coverage rules and who qualifies as an HSA dependent. Find out if you can use your HSA for a spouse, children, and tax dependents.
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Can You Use Your HSA/FSA for Endurance Races?
Learn when endurance race fees, training costs, and recovery products may qualify for HSA/FSA. Understand how a Letter of Medical Necessity can make race expenses eligible.
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Medicare Flex Card Eligibility, Benefits, & Scams Guide
Learn what a Medicare flex card is, how it works, who qualifies, key benefits, whether you can have a card in addition to an HSA or FSA account or plan.
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Critical HSA Taxes & Deductions Questions Answered
We answer the most important questions asked about HSAs and taxes, including whether your HSA contributions are tax deductible and what you need to report.
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How To Invest HSA Funds To Strategically Grow Over Time
Learn how to invest your Health Savings Account (HSA) funds, understand key rules, and explore strategic options to grow your tax-free funds over time.
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