Open enrollment is a stack of checkboxes, a deadline, and a benefits guide that mostly goes unread. Many of the checkboxes don't matter much. Vision coverage, legal plans, pet insurance: pick something reasonable and move on. Three of the choices matter a great deal, and one of them can lock you out for years if you get it wrong the first time. For most employers, what you elect this fall takes effect on January 1 and stays in place for all of 2027.
The short version: choose your health plan on math rather than on fear of the deductible, consider taking the disability coverage while no one is asking health questions, and treat the Roth-versus-traditional question as a bet on your future tax rate. The rest of this post is how to actually do each of those.
1. The health plan, and the account behind it
The choice is usually a high-deductible plan paired with a Health Savings Account versus a traditional PPO with a lower deductible and a higher premium. Many people pick the PPO because the deductible on the other plan looks scary. That's the wrong comparison, because the deductible isn't the cost. The cost is what you'd actually pay across the whole year under each plan. Better to decide based on a calculation rather than a gut feeling.
Run it like this. Take the annual premium difference between the two plans, which often runs into the thousands. Add whatever your employer deposits into your HSA if you pick the high-deductible plan, since many do. Then, estimate your realistic medical spending for the year and see what you'd pay out of pocket under each plan's deductible and coinsurance. For a healthy person or family with routine care, the high-deductible plan often wins even in a year with some real expenses, because the premium savings and the employer seed money cover most of the deductible before you've spent a dollar of your own.
Where it flips: if you know you'll have high, predictable costs next year, a planned surgery, a pregnancy, an expensive ongoing prescription, the PPO can come out ahead. Do the math for your actual situation rather than the average one. And confirm the plan qualifies as a true HDHP, since for 2027 that means a deductible of at least $1,750 for self-only coverage or $3,500 for a family. Some employer plans describe themselves as high-deductible without meeting the IRS definition, and then no HSA contributions are allowed.
The part that turns this from a health decision into a wealth decision is the account itself. The HSA is the only account that gets all three breaks: a deduction going in, tax-free growth, and tax-free withdrawals, as long as the money goes to qualified medical expenses. For 2027 you can put in $4,500 for self-only coverage or $9,000 for a family, plus $1,000 if you're 55 or older. Used the way most people use it, as a debit card for copays, it's a modest convenience. Used the way I wrote about in the HSA post, maxed, invested, and left alone while you pay medical bills from cash flow, it becomes a retirement account that, for medical spending nearly everyone has in retirement, gets better tax treatment than your 401(k). Picking the high-deductible plan opens the door to that strategy. The PPO closes it.
One mechanical catch: you can't contribute to an HSA while you also have a general-purpose health FSA, including through a spouse. A limited-purpose FSA for dental and vision is fine. If you're switching to the HDHP, don't elect the regular FSA alongside it.
2. Disability coverage: take it while they're not asking questions
This is the choice with the trap in it. Group long-term disability coverage at open enrollment is typically offered without medical underwriting, meaning no health questions and no exam. Decline it, and in many plans you'll need to provide evidence of insurability to add it later, at which point any condition you've developed in the meantime can be excluded or can disqualify you entirely. Enrollment is the one window where the insurer isn't allowed to ask, and your health only has to be good enough to be working.
One nuance so the guarantee doesn't get oversold: most group plans still apply a pre-existing condition limitation, commonly for conditions treated in the three months before coverage starts that cause a disability within the first twelve months. Enrolling now also starts that clock, which is one more reason not to wait a year.
Three things to check in the plan summary. First, the definition of disability. Many group policies pay if you can't do your own occupation for the first two years, then tighten to "any occupation" you're reasonably suited for. That's a big narrowing, and it's the reason high earners in specialized work often carry an individual policy on top; I wrote about that in the disability post, and the logic applies well beyond medicine. Second, the benefit cap. A plan that replaces 60 percent of income up to a monthly maximum can replace far less than 60 percent of yours if you're above the cap. Third, whether there's a buy-up option to raise the percentage or the cap, which is usually inexpensive and, again, easiest to add now.
There's also a tax election to look for, if your employer offers it. When the employer pays the premium or you pay it pre-tax, the benefits are taxable income when you need them. Some plans let you elect to pay the premium with after-tax dollars, or to have the premium added to your taxable wages, in exchange for tax-free benefits. On a policy that pays 60 percent of income, the difference between taxable and tax-free benefits can be the difference between replacing 60 percent and replacing 45. If the box exists, it's usually the right box to check.
Short-term disability is the smaller decision. It covers the first weeks or months, often including parental leave, and it's usually inexpensive. Take it if it's offered; the long-term coverage is where the real stakes are.
3. Roth or traditional 401(k)
The enrollment form asks how much to defer, but the decision that matters is which kind: traditional deferrals lower this year's taxable income and get taxed on the way out, Roth deferrals are taxed now and come out tax-free. On the how-much question, the IRS announces 2027 limits in November; for reference, 2026's are $24,500, plus an $8,000 catch-up if you're 50 or older, or $11,250 instead if you're 60 to 63. Set your percentage with the new number in mind once it's out, and if your plan offers a "maximum" election, that does the tracking for you.
The honest framework is a bet on tax rates. If you expect your rate in retirement to be lower than your rate today, traditional wins on the math. If you expect it to be higher, Roth wins. The problem is that nobody knows their rate thirty years from now, and that’s up to Congress. This uncertainty is the argument for tax diversification: having some money in each bucket so that whatever rates do, part of your retirement income is positioned well. Early in a career, when your rate is low and the growth runway is long, Roth tends to make the most sense. At peak earning years in a high bracket, traditional often does. Many people in the middle should simply split the contribution and stop agonizing.
Two details that are new since the last enrollment cycle. If you're 50 or older and your wages from this employer last year were above the threshold, which is $150,000 for 2026 and indexed after that, your catch-up contributions must now be Roth. Your plan has to offer a Roth option for you to make catch-ups at all, so check that yours does. And the employer match has traditionally gone into the pre-tax side regardless of what you elect, though some plans now let you direct it to Roth, which means owing tax on the match in the year it's made. Confirm how yours handles it before you choose.
Whichever you pick, the investment choice inside the plan matters more than the tax wrapper. A low-cost target-date or index fund lineup, held without tinkering, does most of the work, for the same reasons I laid out in the case for portfolio simplicity.
The rest of the form
The dependent care FSA limit is now $7,500, which is a meaningful increase for anyone paying for daycare or after-school care, and it's use-it-or-lose-it, so estimate honestly. A health FSA is worth it only if you have predictable expenses and you're not on an HSA plan. Supplemental life insurance through work is convenient but often more expensive per dollar of coverage than a term policy you buy yourself once you're past a certain amount, and it usually isn't portable. And if your employer auto-enrolls you at a default contribution rate, treat that rate as a floor, not a recommendation.
What locks and what doesn't
The reason to take enrollment seriously isn't that every choice is permanent. It's knowing which ones are. Your health plan election is locked for the year, barring a qualifying life event. FSA elections are locked. Disability coverage you decline may require underwriting to add later. But your 401(k) contribution rate and the Roth-versus-traditional split can usually be changed anytime through the plan website, and HSA payroll contributions can usually be adjusted month to month. So pay close attention to the less flexible of these, and take the ones that are reversible with confidence that you can fix them in February if you got them wrong.
Sources: IRS Rev. Proc. 2026-24 (2027 HSA and HDHP figures); IRS 2026 retirement plan contribution limits (November 2025); SECURE 2.0 Act final regulations on catch-up contributions; One Big Beautiful Bill Act of 2025 (dependent care FSA limit).
