How to Contribute to an HSA: Limits, Methods, and Deadlines

To contribute to an HSA, you need to be enrolled in a qualifying High Deductible Health Plan, stay under the annual IRS limit, and get the money in by your tax filing deadline. For 2026, that limit is $4,400 for self-only coverage and $8,750 for family coverage, plus a $1,000 catch-up if you’re 55 or older.¹ You can move money in through payroll, a direct transfer from your bank, or a one-time rollover from an IRA. The rules around each method differ enough to matter.

Confirm You’re Eligible Before You Contribute

Eligibility is checked month by month. To contribute for a given month, you must be enrolled in an HDHP on the first day of that month and not covered by anything that disqualifies you.²

For 2026, an HDHP must carry a deductible of at least $1,700 (self-only) or $3,400 (family), with out-of-pocket costs capped at $8,500 or $17,000 respectively.¹ The One, Big, Beautiful Bill Act, signed on July 4, 2025, expanded which plans count. Starting January 1, 2026, bronze-level and catastrophic plans qualify as HDHPs for HSA purposes even if they don’t hit those deductible and out-of-pocket thresholds, and they don’t have to be purchased through a marketplace exchange. Direct primary care arrangements no longer disqualify you either, and HDHPs can permanently cover telehealth before you meet the deductible.³

A few things still shut off contributions completely:

Enrollment in any part of Medicare, including Part A. You keep the account and can spend it down, but you can’t add new money.⁴
Being claimed as a dependent on someone else’s tax return.⁴
Coverage under a general-purpose health FSA that duplicates your HDHP’s benefits. A limited-purpose FSA restricted to dental and vision is fine.²

VA care or medical services for a service-connected disability do not disqualify you.²

How Much You Can Contribute for 2026

Self-only HDHP coverage: $4,400
Family HDHP coverage: $8,750
Catch-up (age 55 or older): additional $1,000, fixed by statute and not inflation-adjusted

The cap covers everything that lands in the account. Your own deposits, employer contributions, and payroll deductions all draw from the same limit.¹ If your employer puts in $1,500 toward your family HSA, you have $7,250 of room left. Miss that math and the excess sits in the account collecting a 6% excise tax every year until you remove it.⁴

Both spouses can claim the catch-up if both are 55 or older, but each needs their own HSA. You can’t double up in one account.²

Three Ways to Put Money In

Payroll Deduction

If your employer offers HSA contributions through its benefits portal, this is the most tax-efficient route. Money is withheld before income tax, Social Security tax, and Medicare tax are calculated. A direct contribution you make yourself is deductible on your return but you’ve already paid FICA on it.

Payroll HSA contributions run through a cafeteria plan, so the IRS treats them as employer contributions for reporting. They show up in Box 12 of your W-2 with code W, and you don’t claim them again on Line 2 of Form 8889.⁵ Most employers let you change the deduction amount at any time through the benefits portal, though some restrict changes to open enrollment.

Direct Contributions

If you’re self-employed, your employer doesn’t run payroll HSA deductions, or you just want to put in a lump sum, you can move money straight to your HSA. Most custodians handle this through their online portal: link a checking or savings account, enter the amount, pick the tax year, and confirm. Some accept a mailed check with a deposit form.

Direct contributions belong on Line 2 of Form 8889, and the deduction flows through to Schedule 1 of your 1040.

One-Time IRA-to-HSA Rollover

The tax code allows a single lifetime transfer from a traditional or Roth IRA to your HSA, called a qualified HSA funding distribution. The transferred amount counts toward your annual limit for that year, so it can’t be used to exceed the cap. Once you use it, you can’t use it again.²

A testing period comes with it. You have to remain HSA-eligible for the 12 months after the transfer. Lose eligibility during that window for any reason other than death or disability and the transferred amount goes back into your taxable income, plus a 10% additional tax.⁴

The Deadline and the Year You Assign

Contributions for a given tax year are due by that year’s tax filing deadline. Contributions for 2025 must be in by April 15, 2026.⁴ If April 15 falls on a weekend or federal holiday, the deadline shifts to the next business day. Filing an extension on your tax return does not extend this deadline.

Between January 1 and April 15, any deposit you make could apply to the prior year or the current year. Your custodian’s portal will ask you to pick. Choose wrong and you can end up with an excess in one year and a missed deduction in the other, so check the year designation before confirming any transfer during that window.⁵

Your custodian will send Form 5498-SA showing total contributions. It typically arrives in late May or early June, because it has to cover deposits made through the April deadline.⁴

If You Became Eligible Partway Through the Year

Normally your limit is prorated to the months you had HDHP coverage. The last-month rule offers an alternative: if you’re an eligible individual on December 1, you can contribute the full annual amount as if you’d been eligible all year.⁴

The tradeoff is a 13-month testing period. You have to stay eligible from December 1 of the contribution year through December 31 of the following year. Drop your HDHP, take on disqualifying coverage, or enroll in Medicare during that stretch and the extra amount the rule let you contribute gets pulled into your taxable income for the year you lost eligibility, plus a 10% additional tax.⁴ People turning 65 the following year are the ones who get burned: Medicare enrollment ends eligibility, and the testing period fails.

How Contributions Get Reported

Anyone who contributed to, took a distribution from, or held an HSA during the year files Form 8889 with their return. Married filing jointly with two HSAs means two separate Forms 8889.⁵

Where your contributions land on the form depends on how you made them. Payroll deductions through a cafeteria plan appear on your W-2 as employer contributions and do not go on Line 2. Direct contributions do go on Line 2, and the deduction flows to Schedule 1 of your 1040. Report payroll deductions as personal contributions by mistake and you’ll double-count the deduction.⁵

Fixing an Over-Contribution

Excess contributions happen more often than people expect. You change jobs mid-year and both employers contribute. You miscalculate a prorated limit after a coverage change. You forget your spouse’s employer contribution counts against your family cap. Amounts left in the account at year-end get hit with a 6% excise tax that repeats every year until you clear it.⁴

The cleanest fix is a withdrawal before your tax filing deadline, including extensions. To do it:

Withdraw the excess amount plus any earnings it generated in the account.
Don’t claim a deduction for the withdrawn contributions.
Report the earnings as other income on the return for the year you make the withdrawal.⁵

Already filed without pulling the excess? You still have a window. You can make the withdrawal up to six months after the original due date of the return (not counting extensions), then file an amended return with “Filed pursuant to section 301.9100-2” at the top, along with an amended Form 5329 showing the contributions are no longer excess.⁵

1
Internal Revenue Service. IRS Notice 2026-05 – Expanded Availability of Health Savings Accounts Under the OBBBA
2
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
3
Internal Revenue Service. Treasury, IRS Provide Guidance on New Tax Benefits for Health Savings Account Participants Under the One Big Beautiful Bill
4
Internal Revenue Service. Publication 969 (2025) – Health Savings Accounts and Other Tax-Favored Health Plans
5
Internal Revenue Service. Instructions for Form 8889 (2025)