Start with what you'll actually spend on medical care
The amount you contribute to your HSA should match the medical expenses you expect to pay out of pocket in the next 12 months. That means adding up what you'll likely spend on deductibles, copays, prescriptions, dental work, vision care, and other costs your insurance doesn't cover. If you have a spouse or dependents on your plan, include their expected costs too.
The IRS sets an annual contribution limit — the maximum you're allowed to put in. For 2024, that limit is $4,150 for individual coverage and $8,300 for family coverage. These limits change each year, so check the IRS website or your plan documents for the current year's cap. You cannot contribute more than this amount, even if you expect to spend more.
Most people contribute less than the maximum because their actual medical spending is lower. If you rarely visit the doctor and have a low deductible, you might only need to set aside $1,000 or $2,000. If you take multiple prescriptions, see specialists regularly, or have planned procedures, you might aim for $4,000 or more.
Key Takeaways
- Contribute enough to cover your expected out-of-pocket medical costs for the year, including deductibles, copays, and prescriptions.
- The annual contribution limit is $4,150 for individual coverage and $8,300 for family coverage in 2024, and these limits increase most years.
- You can contribute less than the maximum if your medical spending is predictable and low, or more if you have ongoing health needs or planned procedures.
- Money you don't spend in the current year rolls over to the next year, so overcontributing is less risky than undercontributing.
- If you change jobs or lose coverage, you have a limited window to withdraw HSA funds without penalty for non-medical expenses.
Account for predictable medical expenses
Look at what you actually spent on medical care in the past two or three years. If you spent $2,500 on copays, deductibles, and prescriptions last year, that's a reasonable target for this year — unless something has changed, like a new diagnosis, a planned surgery, or a change in your insurance deductible.
Don't forget categories that people often overlook: dental cleanings and fillings, vision exams and glasses or contacts, mental health therapy, physical therapy, and over-the-counter items like pain relievers or allergy medicine (if prescribed by a doctor). Fertility treatments, hearing aids, and certain medical equipment also count as HSA-may be able to access expenses.
If you have a chronic condition that requires regular treatment or medication, factor in the full annual cost. If you're planning a procedure like surgery or orthodontics, add that to your estimate for the year you'll have the procedure done.
Decide whether to save extra for future years
An HSA is one of the few accounts where money you don't spend rolls over indefinitely. Unlike a flexible spending account (FSA), which has a "use it or lose it" rule, your HSA balance stays with you year after year. This means you can contribute more than you expect to spend in the current year and let the extra grow.
Some people contribute the maximum every year and use the account as a long-term savings tool for retirement medical expenses. Others contribute only what they need for the current year. Both approaches are valid — it depends on whether you have the cash flow to set aside extra money now.
If you're young and healthy with low medical costs, contributing more than you need lets you build a cushion for future years when costs may rise. If you're living paycheck to paycheck, contribute only what you're confident you'll spend, so you can access that money if you need it for other expenses.
Factor in your deductible and out-of-pocket maximum
Your HSA contribution should be at least enough to cover your deductible — the amount you pay before insurance kicks in. If your deductible is $1,500, you should have at least $1,500 in your HSA to cover it if you need medical care early in the year.
Your out-of-pocket maximum is the total you'll pay for covered services in a year before insurance covers 100 percent. In 2024, the out-of-pocket maximum ranges from about $7,000 to $8,000 for individual coverage and $14,000 to $16,000 for family coverage, depending on your plan. If you want to be fully prepared for a worst-case scenario, you could aim to have your out-of-pocket maximum saved in your HSA, though most people don't.
A practical middle ground: contribute enough to cover your deductible, plus an extra $500 to $1,000 for copays and other costs that come up during the year.
Adjust your contribution if your situation changes
You can change your HSA contribution amount during open enrollment each year, or if you have a may have access to life event — marriage, divorce, birth of a child, loss of coverage, or a change in your employer's plan. If your health needs shift, your income changes, or you move to a plan with a different deductible, recalculate what you should be setting aside.
If you realize mid-year that you've contributed too much, you can stop contributing for the rest of the year. If you haven't contributed enough, you can increase your contribution at the next open enrollment period or if a may have access to event occurs. You cannot make up a shortfall from a previous year by contributing extra now — contributions are tied to the calendar year.
Understand what happens if you over- or under-contribute
If you contribute more than you spend, the extra money stays in your account. You can use it in future years for medical expenses, or you can let it grow as a retirement savings tool. There's no penalty for having money left over, unlike an FSA.
If you contribute less than you need, you'll have to pay out-of-pocket medical costs with money from your regular bank account or credit card. You can then reimburse yourself from your HSA later if you have funds available, or you can simply absorb the cost. The key is that you only get the tax benefit on money you actually contributed to the HSA.
If you withdraw money from your HSA for non-medical expenses before age 65, you'll owe income tax on the withdrawal plus a 20 percent penalty. After age 65, you can withdraw money for any reason without the penalty, though you'll still owe income tax on non-medical withdrawals.
Common contribution amounts by health profile
| Health Profile | Typical Annual Contribution | Reasoning |
|---|---|---|
| Young, healthy, minimal medical care | $1,000–$2,000 | Covers routine checkups, occasional copays, and prescription refills if applicable |
| Moderate medical needs, one or two prescriptions | $2,500–$3,500 | Covers deductible, regular copays, and ongoing medication costs |
| Chronic condition or multiple prescriptions | $3,500–$5,000 | Covers higher deductible and frequent specialist visits or medications |
| Planned major procedure or surgery | $4,000–$8,300 | Covers deductible plus expected out-of-pocket costs for the procedure |
Frequently Asked Questions
Can I contribute to my HSA even if I don't spend the money?
Yes. You can contribute the maximum allowed and let the money sit in your account. Unlike an FSA, HSA funds roll over year to year with no expiration. Many people use this to build a long-term medical savings fund, especially if they have the income to set aside extra money.
What if I change jobs mid-year?
Your HSA stays with you regardless of employment. If you've already contributed to your HSA through your old employer's payroll, you can't contribute again through a new employer's plan in the same year — your total contributions across all sources cannot exceed the annual limit. Track what you've contributed so far to avoid going over.
Should I contribute the maximum if I'm not sure I'll spend it?
Only if you have the cash flow to spare. The main advantage of contributing more is the tax savings and the ability to let money grow for future medical expenses. If you need that money for other bills, contribute only what you're confident you'll spend on medical care.
Can I use my HSA for my spouse's medical expenses?
Yes, if your spouse is covered under your family HSA plan. You can also use HSA funds for your dependents' medical expenses. The money doesn't have to be spent by the person whose name is on the account.
What if I contribute too much by accident?
Contact your HSA provider or plan administrator right away. You may be able to withdraw the excess contribution before the tax filing deadline. If you don't catch it in time, you'll owe income tax on the excess plus a 6 percent penalty for each year it remains in the account. It's worth fixing quickly.