How much you contribute depends on your income, your expected medical costs, and your tax situation
There is no single right amount. The IRS sets a maximum you can put in each year—$4,150 for individual coverage and $8,300 for family coverage in 2024—but you can contribute less, or nothing at all. What makes sense depends on whether you expect to use the money this year, whether you want to save it for future medical costs, and how much you can afford to set aside without affecting your monthly budget.
The main trade-off is this: money you put in reduces your taxable income now, but you can only withdraw it for medical costs without penalty. If you contribute more than you need and spend it on non-medical things, you pay income tax plus a 20 percent penalty on the non-medical withdrawal. If you contribute less than you could, you miss out on the tax break.
Key Takeaways
- The IRS maximum for 2024 is $4,150 for self-only coverage or $8,300 for family coverage, but you can put in any amount up to that limit.
- Money in an HSA reduces your taxable income for the year you contribute it, which saves you money on federal income tax.
- You can only withdraw HSA money for medical costs without paying a penalty; non-medical withdrawals are taxed as income plus 20 percent.
- If you do not spend the money in your HSA by the end of the year, it rolls over and stays available for future medical costs—there is no "use it or lose it" rule.
- Your employer may contribute to your HSA, which counts toward the annual limit but does not reduce the amount you can contribute yourself.
Understand the annual contribution limit and how it works
The IRS sets a ceiling on how much you can put into an HSA in a calendar year. For 2024, that ceiling is $4,150 if you have self-only health insurance coverage, or $8,300 if you have family coverage. These numbers change each year, usually by a small amount. Your HSA provider will tell you the current limit when you open or fund your account.
If your employer contributes to your HSA, that money counts toward your limit. For example, if your employer puts in $1,500 and you want to contribute $2,500, your total would be $4,000—still under the $4,150 individual limit. You cannot exceed the limit by combining employer and personal contributions.
You can contribute less than the maximum, or nothing at all. Some people contribute only what they expect to spend on medical costs that year. Others contribute the full amount and let the money accumulate for future years.
Calculate what you might spend on medical costs this year
Start by looking at your deductible—the amount you pay out of pocket before your insurance starts paying. If your deductible is $2,000, that is a baseline for what you might need to cover. Add any other predictable costs: regular prescriptions, ongoing therapy, dental work you know is coming, or vision care.
If you are generally healthy and rarely see a doctor, your medical costs might be just your deductible. If you take multiple medications, see specialists, or have a chronic condition, your costs will be higher. Look at what you actually spent last year on medical bills, prescriptions, and copays—that is often a good guide for this year.
Once you have a rough number, you can decide whether to contribute that amount, more, or less. Contributing more means you get a bigger tax break but have to make sure you use or save the money for medical costs. Contributing less means you keep more money in your regular checking account but lose the tax advantage on the difference.
Factor in the tax savings from your contribution
Money you put into an HSA reduces your taxable income, which means you pay less federal income tax. The exact savings depends on your tax bracket. If you are in the 22 percent federal tax bracket and contribute $2,000 to your HSA, you save roughly $440 in federal tax. If you are in the 12 percent bracket, the same contribution saves roughly $240.
This tax savings is automatic—you do not have to do anything special to claim it. When you file your tax return, your HSA contributions are deducted from your income before tax is calculated. Some people use this as a reason to contribute more: the tax break effectively reduces the cost of setting money aside.
Keep in mind that this tax break only applies to federal income tax. Depending on your state, you may also save on state income tax, but a few states do not recognize HSA contributions as tax-deductible. Check your state's rules if you live in a state with income tax.
Decide whether to save for future medical costs or spend this year's money
Unlike a flexible spending account (FSA), an HSA does not have a "use it or lose it" rule. Money you do not spend in 2024 stays in your account and is available in 2025 and beyond. This means you can contribute more than you expect to spend this year and let it accumulate for future medical costs, retirement, or a year when your medical expenses are higher.
Some people treat an HSA as a long-term savings vehicle and contribute the maximum every year, spending only what they need and letting the rest grow. Others contribute only what they expect to spend in the next 12 months. Both approaches are valid—it depends on your financial situation and whether you have other savings.
If you are young and healthy, contributing more than you need now and saving it for future costs can make sense. If you are tight on cash or expect a major medical expense soon, contributing only what you will actually spend keeps your money available for other bills.
Account for employer contributions and payroll deductions
If your employer offers an HSA and contributes to it, that money is already in your account and counts toward your annual limit. You can still contribute additional money yourself, but your combined total cannot exceed the IRS limit.
Many employers let you contribute to your HSA through payroll deduction—money is taken from your paycheck before taxes are calculated. This is often the easiest way to contribute because the money goes straight into your HSA and you see the tax savings on your paycheck. You set the amount when you enroll, usually during open enrollment or when you first become may be able to access for the HSA.
If you change jobs or lose employer coverage, you can still contribute to your HSA on your own, but you will have to pay taxes on the contribution yourself when you file your tax return. Some people continue contributing after leaving a job because the tax break is still worth it.
Understand what happens if you contribute too much or too little
If you accidentally contribute more than the IRS limit, you can withdraw the excess and the earnings on it before your tax deadline. This is called an excess contribution correction. You will owe income tax on the earnings, but you avoid the 6 percent penalty tax that normally applies to excess contributions. Your HSA provider can help you file the correction.
If you contribute less than the maximum, you simply miss out on the tax break for that year. There is no penalty, and you can contribute more next year if you want. Some people contribute less early in the year and add more later if their medical costs turn out to be higher than expected.
If you withdraw money from your HSA for something other than a medical cost, you pay income tax on the withdrawal plus a 20 percent penalty. After age 65, the penalty goes away—you can withdraw money for any reason and only pay income tax—but that is a long-term strategy, not a reason to over-contribute now.
Frequently Asked Questions
Can I change how much I contribute during the year?
If you contribute through payroll deduction, you can usually change your contribution amount during open enrollment or if you have a may have access to life event like a marriage, birth, or job change. Outside those windows, most employers do not allow changes. If you contribute on your own, you can contribute any time up to your tax deadline.
What counts as a medical cost I can withdraw for?
Medical costs include deductibles, copays, coinsurance, prescriptions, dental work, vision care, mental health treatment, and many other health-related expenses. Cosmetic procedures, gym memberships, and over-the-counter vitamins do not count unless a doctor prescribes them. The IRS publishes a full list, and your HSA provider can tell you whether a specific cost is covered.
What if I do not use all the money in my HSA by the end of the year?
The money rolls over to the next year. There is no deadline to spend it. You can let it accumulate for years and use it whenever you have medical costs. Some people use their HSA as a retirement savings account and plan to spend it on medical costs in retirement.
Do I have to contribute the same amount every year?
No. You can contribute the maximum one year and nothing the next year. You can also change your contribution amount if you have a may have access to life event. Your contribution decision each year is separate from previous years.
What if my employer contributes more than I expected?
Employer contributions count toward your annual limit. If your employer contributes $3,000 and you also contribute $2,000, your total is $5,000—which exceeds the $4,150 individual limit. You would need to withdraw the excess before your tax deadline to avoid penalties. Check with your employer or HSA provider about how much they plan to contribute so you can adjust your personal contribution accordingly.