HSA or FSA? The 2027 Numbers Just Changed the Math

Derek WuOkay, so before we get into HSAs versus FSAs, I wanna hand you a number that's already locked in for 2027, and almost nobody's talking about it yet. The IRS just locked in the 2027 HSA contribution limits: forty-five hundred for individual coverage, nine thousand for family coverage. Most people won't come close to maxing that out, but knowing the ceiling now means one whole variable in your open enrollment decision is already fixed. And this isn't some floating estimate from a finance blog. It's Revenue Procedure 2026-24, actual IRS guidance published May 29th, 2026, and one HSA-focused resource confirms that same date. The IRS does this every year, inflation adjustments under the tax code, but this year, the numbers landed months earlier than usual, and that head start is the whole hook. Think about that timing. Most people don't even log in to their open enrollment portal until October or November. It's like getting next year's tuition bill before you've even registered for classes. That's wild to me. It's the earliest, most overlooked number of the whole benefits season, and it's sitting there in a PDF nobody reads. Now, there's a catch to actually getting that HSA contribution room. Your plan has to qualify as a high-deductible health plan, and SHRM's reporting says the minimum deductible threshold's nudged up a little for 2027 too. We're talking a minimum deductible of seventeen hundred and fifty for self-only coverage and thirty-five hundred for family coverage, with out-of-pocket caps of eighty-seven hundred and seventeen thousand four hundred respectively. A high-deductible plan just means a bigger deductible and usually a lower monthly premium. That's the trade-off you're accepting to unlock the HSA in the first place. Think of the premium difference like a subscription fee. You're paying less each month for insurance in exchange for a bigger bill if something big actually happens. It's a trade a lot of people make without ever really deciding to, and that decision matters more than the number on the contribution limit itself. So you can't just want an HSA. Your plan has to clear that deductible bar first. So here's where we are. Forty-five hundred, nine thousand. Those numbers are law, not a guess. The deductible rule's moved. The dollar limits are set. That whole side of the board is finished. So that's the HSA side. Numbers in hand. Done deal. Now let's flip to the number everyone's already quoting for the other option, the FSA side, because that one's nowhere near settled. Okay, so remember that FSA number everyone keeps repeating, thirty-five hundred dollars? Turns out that number doesn't actually exist yet, not officially anyway. The number going around this fall says the 2027 health FSA cap is expected to land around thirty-five hundred dollars with a seven-hundred-dollar carryover on top of that. Expected. That word is doing a lot of work. A benefits research site called BenefitsUSA ran the same projection and landed on that same thirty-five hundred dollar figure, so it's not like someone made it up out of thin air. But here's what's different from the HSA side. Mercer, the benefits consultancy, actually says the quiet part out loud. Mercer's own write-up calls its 2027 health FSA figure an unofficial projection built off chained CPI data and flat out says the IRS usually doesn't confirm the real number until October or November. Practically, that matters at your kitchen table. If you elect your FSA contribution based on that unconfirmed thirty-five hundred number and the real cap lands lower, you could end up with a payroll deduction that doesn't match what the IRS actually allows, and payroll systems catch that fast. So the people making the projection are the ones telling you not to trust it too much yet. And it gets messier. There's a tax tracker site that ran its own math and came out at thirty-four fifty, not thirty-five hundred. Fifty bucks apart, sure, small gap, but that site says its own number is, quote, "an extrapolation rather than a real computation." Extrapolation rather than a real computation from the people who made the number. So you've got two separate projections from two separate sources fifty dollars apart, and both are waving a flag that says, "Don't quote it in October." Picture the HSA side as a number stamped and filed away months ago. The FSA side is more like a weather forecast for a day that's still six weeks out. Everybody's guessing the general temperature, but nobody's calling it exact. And that gap matters more than it sounds. If you're deciding your open enrollment plan off, the FSA lets me put away more or less than the HSA, you're comparing a locked figure to a forecast. That's not really a comparison. That's comparing a receipt to a guess. So here's where this actually leaves us. One side of this decision is settled. The other side is everybody's best guess dressed up to look like a number, which means the whole pick whichever limit is bigger approach was broken from the start. You can't rank two things when only one of them is Real Yet. So forget the math race for a second. The actual question that Decides which account is right for you Isn't about dollars at all. It's about how you use Healthcare in the First place. Okay, we've got the Filter. Now let's Actually run it. First piece of data that surprised me. SHRM cites research from EBRI, the Employee Benefit Research Institute, and it found something that cuts against how HSAs get sold to you. Most people don't treat their HSA like a mini retirement account. They spend it. Glasses, a dentist bill, whatever came up that month. Which matters because Half the sales pitch for these accounts is invest it and let it grow. If you're the person pulling money out for near-term costs, that pitch was never really about you. So ask yourself honestly, are you the investor type or are you the person who's going to need that money for actual visits this year? That's test one. Picture two coworkers on the same HDHP. One quietly invests the account and rarely touches it, riding out market swings, while the other empties it every spring for allergy shots and a dental cleaning. Same account, same locked contribution limit, completely different playbook. Test two is about who even gets to play, and this is the part almost nobody mentions. HSAstore.com flags a change that took effect January 1st, 2026. People enrolled in ACA Bronze or Catastrophic Marketplace plans became HSA eligible, meaning this isn't just an office job employer plan conversation anymore. Bought your own plan last year in the marketplace? Picked Bronze coverage to save on premiums? This is worth double-checking before enrollment closes because that eligibility wasn't even in place before 2026. So put the pieces together. One number's locked, one's a guess, and most people use their account for near-term spending, not investing. What does that actually tell you to do? If you rarely go to the doctor and can stomach a higher deductible, the HDHP path wins. That locked contribution room isn't just a tax break. It's money you're probably spending on real costs anyway, so it might as well sit somewhere useful in the meantime. But if your costs are frequent and predictable, recurring prescriptions, a kid in braces, physical therapy every week, the traditional plan with the flexible spending account is the boring answer, even with a cap that's still unconfirmed. Because that account was built for exactly that: known frequent expenses you can plan around, not a bet on the future. So the fight over which cap is bigger was a distraction the whole time. The real question was never the dollar figure. It was how many times a year you actually sit in a waiting room. That's the real filter, and knowing it isn't the same as using it correctly when your enrollment window is open for maybe two weeks. So let's walk through exactly how you apply it before that window closes. Okay, you've got both sides now. Give me five minutes because we're running this against your enrollment window before it closes. Grab a scrap of paper or open a blank note in your phone. Doesn't matter. Write down every prescription refill you picked up this year, every single one. Now add specialist visits, physical therapy, an allergist or dermatologist, anything you saw more than twice. That's more common than people think. Most of us aren't tracking this until enrollment forces the question. If that list has four or five things sitting on it, you're a frequent user, full stop. Frequent, predictable costs mean the FSA lane fits you. That money's coming out of your paycheck either way, so you might as well get the tax break on it. Think about the parent driving a kid to allergy shots every other week. That's a recurring cost, plain and simple. But flip it. If your list is basically empty, one urgent care trip, maybe a dentist cleaning, maybe nothing at all, you're the rare case. That's your HSA lane. You can tolerate a higher deductible because you're barely touching the plan most years. It's a small thing, but it changes the whole calculation for anyone who barely sees a doctor. And remember, whatever you put in an HSA and don't spend just keeps rolling forward. No expiration, no forfeiting it at year-end. Now, say you land on FSA anyway. One caution before you lock in a number on your enrollment form. The figure you'd budget against is still somebody's best guess, low three thousands, depending on which projection you trust. And the amount you'd get to carry into next year is smaller too, nowhere close to what rolls over automatically on the HSA side. So don't max out against a figure that could still move once the actual confirmation lands this fall. Leave yourself a little room. Maybe that's a hundred dollars less than the projected cap, just in case the real number comes in lower. Better to be conservative here than to guess high. Five minutes, one list, one honest answer about how often you're actually sitting in a waiting room. This isn't complicated once you've done it. Five minutes tops, and you're done for the year. You don't need a spreadsheet for this. You don't need to reread the benefits packet a third time hunting for a formula. So no more spreadsheet anxiety, no more waiting on the IRS to confirm anything before you decide. Pick the lane that matches how your year actually looked. Hit submit on your enrollment, close the tab, and go do something more interesting with your afternoon. Next year, the IRS locks the FSA number for real. This year, you didn't need it to make the call.