I’m not a financial advisor, just a finance student sharing what I’ve actually done and learned. Do your own research before making any financial decisions.

When I started my first internship, I spent maybe five minutes on the benefits enrollment page before clicking through to the salary screen. Health insurance felt like a formality. I figured I was 20, healthy, and had more important things to figure out. That was a mistake I’m still annoyed at myself for, because buried in that benefits page was an HSA option I completely ignored.

If you’re about to start your first real job and you’re glazing over during benefits enrollment the same way I did, this is the thing you need to actually stop and read.

What an HSA Actually Is

HSA stands for Health Savings Account. It’s a special type of account where you can put pre-tax dollars specifically to pay for medical expenses. The key word there is pre-tax. Money goes in before the government takes its cut, it grows tax-free while it sits there, and if you spend it on qualified medical expenses, you pay no taxes when it comes out either. That triple tax advantage is real and it’s genuinely unusual. Most accounts give you one tax break. An HSA gives you three.

The 2025 contribution limit is $4,300 for individual coverage. You can contribute up to that amount per year, whether through payroll deductions or by depositing directly into the account yourself.

The catch, and it’s a real one, is that you can only open and contribute to an HSA if you’re enrolled in a High Deductible Health Plan, or HDHP. For 2025, the IRS defines an HDHP as a plan with a minimum deductible of $1,650 for self-only coverage. Not every employer offers an HDHP option. But if yours does, the HSA that comes attached to it deserves serious attention.

One more thing that most people miss: the money in your HSA rolls over every single year. There’s no “use it or lose it” rule like there is with an FSA. Whatever you don’t spend just stays in the account and keeps growing.

The Part Nobody Explains to New Grads

Here’s where it gets interesting, and where I think most articles explaining HSAs drop the ball. They talk about HSAs as a way to pay your doctor bills. That’s technically accurate but it undersells the account completely.

After your HSA balance hits a certain threshold, which varies by provider but is often $1,000 or $2,000, you can invest the rest. The same way you’d invest in a Roth IRA. Index funds, ETFs, whatever your HSA provider offers. And that invested money grows tax-free.

I have a Roth IRA at Fidelity that I opened at 19 and primarily invest in FSKAX, Fidelity’s total market index fund with a 0.015% expense ratio. When I started actually comparing accounts and tax advantages, I realized an HSA at the right provider can function almost the same way for retirement, just with the added benefit that if you do need to spend it on medical costs at any point, you’re covered.

After age 65, you can withdraw HSA funds for any reason at all, not just medical expenses. You’ll pay ordinary income tax on non-medical withdrawals at that point, same as a traditional 401k. But for actual healthcare expenses, which are almost guaranteed to be substantial in retirement, every dollar comes out completely tax-free. When you frame it that way, an HSA starts to look less like a bill-payment account and more like a stealth retirement account.

If you’re still building out your overall savings approach for your first job, I wrote more about prioritizing where your money goes in how much to save from your first job paycheck.

How to Decide if an HDHP with an HSA Is Right for You

This is the part where I have to be honest with you: the math isn’t always obvious, and your specific situation matters a lot.

An HDHP usually comes with lower monthly premiums. The trade-off is a higher deductible, meaning you pay more out of pocket before insurance kicks in. If you’re generally healthy, rarely see doctors, and don’t have any ongoing prescriptions, the lower premiums plus HSA contributions can easily come out ahead. If you have regular medical needs, a traditional PPO plan with higher premiums but lower out-of-pocket costs might actually be cheaper for you overall.

The way I’d think about it: take your employer’s HDHP monthly premium and your PPO monthly premium and find the annual difference. Then look at the deductibles. If the premium savings from the HDHP plus your employer’s HSA contribution (many employers put money directly into your HSA as part of the benefit, sometimes $500 to $1,500 per year) covers a reasonable gap, the HDHP is probably worth it. You’re essentially being paid to have the account.

Fidelity offers an HSA called the Fidelity HSA. No account fees, no minimum balance, and you can invest in any of Fidelity’s funds including FZROX, their zero expense ratio total market index fund. That’s where I’d point most people who want to actually invest their HSA dollars rather than just let them sit in a cash account earning almost nothing. HSA Bank, Lively, and HealthEquity are other common options employers use, though they sometimes charge monthly fees or require higher balances before you can invest.

Also worth reading before you commit to any plan: health insurance options after college graduation breaks down the landscape in more detail than I’m covering here.

What to Do When You Actually Enroll

If you decide an HDHP and HSA make sense for your situation, don’t just open the account and leave it in the default cash position. That’s the mistake I see most. The default is usually a low-yield savings option inside the HSA, sometimes paying around 0.01% to 0.5% APY depending on the provider. Meanwhile my Marcus by Goldman Sachs high-yield savings account pays 4.1% APY and that’s just a regular savings account.

Move the HSA money above whatever minimum threshold your provider requires into investments as soon as you can. If your employer uses Fidelity for the HSA, the process takes about ten minutes and you can put it directly into FZROX or FSKAX. If they use HealthEquity or HSA Bank, the investment interface is clunkier but the option is still there.

On the contribution side, you have a choice. You can contribute through payroll deductions, which saves you FICA taxes on top of federal income tax, so it’s slightly more efficient than contributing directly yourself. Or you can contribute directly and deduct it on your tax return. Either way you get the deduction. But payroll deductions squeeze out a little more savings because FICA doesn’t apply, which is an extra 7.65% you’re keeping. Not enormous, but real money.

One more thing worth building the habit around: keep receipts for every medical expense you pay out of pocket, even if you’re paying cash instead of using your HSA. There’s no time limit on reimbursing yourself from an HSA for past qualified expenses, as long as the expense occurred after you opened the account. So theoretically you could let your HSA grow invested for 20 years, then reimburse yourself for the doctor’s visit you paid out of pocket in 2026. I could be wrong on how aggressively people actually do this in practice, but the IRS rule is legitimate and worth knowing.

My first internship paycheck had $340 withheld in taxes I hadn’t accounted for at all. Spent an evening actually reading about FICA and federal withholding after that. Pre-tax benefits like HSA contributions reduce your taxable income before those calculations run, which means they help on multiple levels at once. That was the moment I started actually paying attention to my benefits package instead of treating it as an afterthought.

If navigating your first real paycheck feels overwhelming in general, I’d start with how to file taxes as a college student for the first time to get your footing.

An HSA isn’t the right call for everyone and I’m not going to pretend otherwise. But for a healthy 22 or 23 year old starting their first job with access to an HDHP, it’s one of the most underused accounts out there. Most people I know blew past it during enrollment without a second thought. Don’t be that person.

Frequently Asked Questions

Q: Can I open an HSA on my own without going through my employer? Yes, as long as you’re enrolled in a qualifying HDHP. You can open an HSA directly with a provider like Fidelity even if your employer doesn’t offer one, and contribute up to the annual limit yourself.

Q: What happens to my HSA if I switch jobs or switch to a non-HDHP plan? The money is yours and stays in the account permanently. You just can’t make new contributions during any period when you’re not enrolled in an HDHP. You can still spend existing funds on qualified medical expenses.

Q: What counts as a qualified medical expense? The list is broader than most people expect. It includes doctor visits, prescriptions, dental care, vision care, mental health services, and even some over-the-counter medications. The IRS Publication 502 has the full list.

Q: Is an HSA better than a Roth IRA for retirement savings? They serve different purposes and aren’t really in competition. Conventional thinking is to max your 401k to the employer match first, then your HSA, then your Roth IRA, though the right order depends on your situation. An HSA has a triple tax advantage that a Roth IRA doesn’t match for medical expenses specifically.

Q: Can I use HSA funds to pay for my spouse or dependents’ medical expenses? Yes. Even if your spouse and dependents aren’t covered under your HDHP, you can use your HSA to pay for their qualified medical expenses tax-free.