How Much to Put Into Your HSA Each Year

Start with what you can afford, then work backward from your health care costs

The amount you contribute to your HSA depends on three things: how much money you have available, how much you expect to spend on health care this year, and the annual contribution limit set by the IRS. You are not required to contribute the maximum. Many people contribute what they can afford and adjust the amount each year based on whether they actually used the money.

The most common mistake is treating the HSA like a retirement account when you are young and healthy, then scrambling to cover medical bills when you need the money now. A better approach is to estimate your actual health care costs for the coming year—copays, prescriptions, dental work, vision care—and contribute enough to cover those costs, plus a small cushion for surprises.

Key Takeaways

• The IRS sets an annual contribution limit that changes each year; for 2024 it is $4,150 for individual coverage and $8,300 for family coverage, but you contribute only what you can afford.
• Your contribution limit is reduced if you enroll in the HSA partway through the year, unless you use the last-month rule, which requires you to maintain HSA coverage through the following December.
• You can contribute less than the maximum and still get the tax deduction; there is no minimum contribution amount.
• If your employer offers an HSA match, contributing enough to capture the full match is usually the best financial move, similar to a 401(k) match.
• Unused HSA money rolls over to the next year and stays in the account indefinitely, so you do not lose money by contributing more than you spend annually.

The IRS contribution limits for 2024 and 2025

For 2024, the IRS allows you to contribute up to $4,150 if you have individual HSA coverage, or $8,300 if you have family coverage. For 2025, those limits increase to $4,300 and $8,550. If you are 55 or older, you can add an extra $1,000 per year as a catch-up contribution. These limits apply to the total amount contributed by you and your employer combined—if your employer contributes $1,500, you can only contribute $2,650 more to reach the $4,150 limit.

The contribution limit applies only to the calendar year in which you make the contribution. If you open an HSA in June, your limit for that year is reduced proportionally. However, the IRS allows an exception called the "last-month rule": if you are HSA-may be able to access on December 1, you can contribute the full year's amount, but you must stay HSA-may be able to access through December 31 of the following year, or you will owe taxes and penalties on the excess.

How to estimate your actual health care spending

Look at your medical bills from the past two years. Add up what you paid out of pocket: copays for doctor visits, coinsurance after you met your deductible, prescription costs, dental cleanings and work, vision exams and glasses or contacts, and any other health-related expenses. If you have a chronic condition that requires regular medication or monitoring, include those costs. If you are planning a procedure you know is coming—surgery, fertility treatment, dental implants—add that too.

Then add 10 to 20 percent as a buffer for unexpected costs: a sprained ankle, an urgent care visit, a new prescription. That total is a reasonable contribution target. You do not need to contribute the full amount in January; you can spread contributions across the year through payroll deductions if your employer offers that option, or make lump-sum contributions whenever you have the money available.

When to contribute more than your expected spending

If your employer matches HSA contributions, contribute enough to capture the full match. An employer match is assistance programs and is one of the best returns you can get on any investment. If your employer contributes $1,000 when you contribute $2,000, that is a 50 percent immediate return.

If you are in a high tax bracket and have money available to invest, contributing more than your immediate health care needs can make sense. HSA contributions reduce your taxable income, which saves you money on federal income tax, state income tax (in most states), and self-employment tax if you are self-employed. The money grows tax-free and can be withdrawn tax-free for may have access to medical expenses at any point in the future. After age 65, you can withdraw money for any reason without penalty, though non-medical withdrawals are taxed as ordinary income.

What happens if you contribute too much

If you contribute more than the IRS limit, you owe taxes and a 6 percent penalty on the excess amount each year it remains in the account. You can fix this by withdrawing the excess before your tax filing deadline (usually April 15 of the following year). Your HSA provider can help you calculate and process the withdrawal.

If you contribute the right amount but your circumstances change—you lose HSA-may be able to access coverage, you switch to a different health plan, or you have a major life event—you may need to adjust. Contact your HSA provider or your employer's benefits administrator to understand how the change affects your account.

How to adjust your contribution year to year

At open enrollment each year, review what you actually spent from your HSA in the past year. If you spent $2,000 and contributed $4,000, you have a $2,000 cushion already in the account. You might contribute less this year, or the same amount if you want to build the account for future years. If you spent $4,000 and contributed $3,000, you know you need to contribute more next year or plan to pay some medical costs out of pocket.

Keep in mind that HSA money does not expire. Whatever you do not spend this year stays in the account and earns interest or investment returns, depending on how your provider invests the funds. Some people use the HSA as a long-term savings vehicle and contribute the maximum every year, paying current medical expenses out of pocket and letting the HSA grow. This strategy works only if you can afford to pay medical bills without touching the HSA.

Contributing through payroll versus making direct contributions

If your employer offers payroll deductions for HSA contributions, that is usually the simplest route. The money comes out before taxes are calculated, so you get the tax benefit automatically. You can change your contribution amount during open enrollment or when you have a may have access to life event, such as a birth, marriage, or change in health coverage.

If you do not have payroll deductions available, or if you want to contribute additional money beyond what you deduct from your paycheck, you can make direct contributions to your HSA. You will need to claim the deduction on your tax return (Form 8889) when you file. Direct contributions take longer to process and require you to remember to file the deduction, so payroll deductions are less error-prone if your employer offers them.

Frequently Asked Questions

Can I contribute to an HSA if I am unemployed or self-employed?

Yes. You can open an HSA as long as you are enrolled in an HSA-may be able to access health plan. If you are self-employed, you can deduct HSA contributions on your tax return. You will need to make direct contributions to your HSA account rather than payroll deductions, since you do not have an employer processing your pay.

What if I get a big tax refund—should I contribute more to my HSA?

A large refund usually means you had too much tax withheld from your paycheck. Increasing your HSA contribution through payroll deductions will reduce your withholding and get you closer to breaking even, which is more efficient than waiting for a refund. If you have already filed your taxes, you can make a direct contribution to your HSA for the current year up until the tax filing deadline.

Does my spouse's HSA contribution count toward my family plan limit?

Yes. If you and your spouse are both enrolled in the same family HSA plan, your combined contributions cannot exceed the family limit. If you each have separate HSA accounts under different employers, each account has its own limit. Check with both employers to understand how contributions are tracked.

What if I change jobs mid-year?

Your HSA stays with you; it does not belong to your employer. If your new employer offers an HSA, you can continue contributing to your existing account or open a new one. Your total contributions across all accounts for the year cannot exceed the annual limit. If your new job does not offer HSA coverage, you can still contribute to your existing HSA as long as you remain enrolled in an HSA-may be able to access health plan.