HSA Tax Rules 2026: Limits, Penalties, and Forms Cheat Sheet

The Numbers You Need for 2026

Every HSA rule in one place. No fluff. No long explanations. Just the figures the IRS cares about and the forms the IRS expects.

This page is meant to be bookmarked. Print it if that helps. Each section answers one question.

2026 HSA Contribution Limits

The IRS sets two contribution limits. One for self-only coverage, one for family coverage. These limits apply to the total going into the HSA from all sources combined (you, your employer, anyone else).

The catch-up is per spouse. If both spouses are 55 or older, both can add $1,000. But the catch-up must go into each spouse's own HSA. You cannot stack two catch-ups in one account.

The contribution deadline for 2026 is April 15, 2027. Same as the tax filing deadline.

For more on the limits, see the 2026 HSA contribution limits post.

2026 HDHP Requirements

You can only contribute to an HSA if you are enrolled in a qualifying High-Deductible Health Plan. The IRS sets the minimum deductible and maximum out-of-pocket each year.

If your plan deductible is below the minimum, the plan is not HSA-eligible. If the out-of-pocket is above the maximum, same problem. Both numbers must fall inside the bracket for the plan to qualify.

Preventive care can be covered before the deductible. That does not break HDHP status.

Required Tax Forms

Three forms cover the entire HSA tax year. You file one of them. Your HSA provider files the other two.

Form 8889 is mandatory every year you have an HSA. Even if you contributed $0. Even if you spent $0. If the account exists, the form is required.

The 1099-SA arrives by January 31. The 5498-SA arrives by May 31. Keep both.

HSA Penalties

Three penalties show up in HSA tax rules. Each one has a clean fix if caught early.

1. The 20% non-medical penalty (under 65).

Pull money out for anything other than a qualified medical expense before age 65. You owe income tax plus a 20% penalty under IRC 223(f)(4). At age 65 the 20% penalty disappears. Income tax still applies on non-medical withdrawals.

2. The 6% excess contribution penalty.

Contribute more than the annual limit and the IRS charges 6% per year on the excess (IRC 4973(g)). Every year the excess sits in the account. Remove the excess (and any earnings on it) before the tax filing deadline to avoid the 6%.

3. Income tax on undocumented distributions.

Pull money out without a qualified medical expense to back it up and the entire withdrawal becomes taxable income. No receipt, no tax-free withdrawal. See common HSA mistakes to avoid for more.

The 2026 HSA Mileage Rate

Driving to a doctor, dentist, hospital, or pharmacy counts as a qualified medical expense. The IRS lets you reimburse yourself for the miles.

2026 medical mileage rate: 20.5 cents per mile (per IRS Notice 2026-10).

That covers any medical-related driving. Trips to the doctor. Trips to pick up a prescription. Trips to the hospital for a procedure. Trips for a child's appointment.

You can also deduct parking and tolls on top of the mileage.

Track it as you go. A round trip of 30 miles is $6.15 in HSA-eligible reimbursement. Five trips a month is $30.75. Over a year that is $369 in tax-free withdrawals you can take from the HSA.

The Last-Month Rule

This rule confuses people every year. Here is the short version.

If you are HSA-eligible on December 1 of the tax year, you are treated as eligible all year. That means you can contribute the full annual limit. Even if you only had HDHP coverage for part of the year.

The catch is the testing period. You must stay HSA-eligible for the next 12 months (through December 31 of the following year). If you lose HDHP coverage during that window, the contributions made under the last-month rule become taxable. Plus a 10% additional tax under IRC 223(b)(8)(B).

If you are not sure you will keep HDHP coverage, prorate instead. Take the annual limit, divide by 12, multiply by months of coverage. That is the safe contribution.

Qualified Medical Expense Categories

The IRS publishes a long list. Most HSA spending falls into a few buckets.

Standard medical:

• ●Doctor visits and copays
• ●Hospital stays
• ●Surgery
• ●Lab work and imaging
• ●Prescription drugs
• ●Insulin and diabetic supplies

Dental and vision:

• ●Cleanings, fillings, crowns, root canals
• ●Orthodontia (braces, Invisalign)
• ●Eye exams, glasses, contacts, contact solution
• ●LASIK and corrective surgery

Mental health:

• ●Therapy and counseling
• ●Psychiatric care
• ●Prescription mental health medications

Family-related:

• ●Pregnancy tests and prenatal care
• ●Childbirth costs
• ●Lactation supplies and consultants
• ●Fertility treatment

Often missed:

• ●Sunscreen (SPF 15+)
• ●First aid kits
• ●Menstrual products
• ●Acupuncture
• ●Chiropractic care
• ●Mileage to and from medical visits

Full eligible expense list here.

Premium Rules

Insurance premiums are mostly NOT HSA-eligible. There are four exceptions.

The Medigap exclusion catches people every year. Medicare Parts A, B, C, and D are all eligible after 65. Medigap (Medicare Supplement) is not.

Spouse and Family Rules

A few specifics that come up often.

Married, both have HSAs:

The family contribution limit is $8,750 in 2026. That total can be split between two spouses' HSAs in any ratio. Each spouse age 55+ can add their own $1,000 catch-up to their own account.

Married, only one HSA:

The full $8,750 family limit can go into the one HSA. Catch-up contributions still must go into each spouse's own account.

Divorce:

HSA splits via a court order are not taxable. The funds move trustee-to-trustee under IRC 223(f)(7). The receiving spouse's HSA keeps its tax-free status.

Death:

A spouse who inherits the HSA keeps it as an HSA. Anyone else inherits it as taxable income in the year of death. Naming a spouse as beneficiary preserves the tax treatment.

Tax Treatment Summary

The HSA is the only account with three tax breaks. Here is the full picture in one table.

Full HSA vs 401(k) vs Roth IRA breakdown.

State Tax Considerations

Most states follow federal HSA tax rules. Two do not.

California and New Jersey:

HSA contributions are NOT deductible at the state level. HSA earnings are taxable as state income. Withdrawals follow federal rules. See the California and New Jersey HSA state taxes guide for the full picture.

(New Hampshire previously taxed HSA interest and dividends through its Interest and Dividends tax. That tax was repealed effective tax years after 2024, so it no longer applies for 2026.)

If you live in CA or NJ, plan for the state-level tax. Federal treatment is unchanged.

What to Save and for How Long

The IRS does not set a retention rule for HSA receipts. But the burden of proof is on you if audited.

Recommended retention (conservative; the IRS statute of limitations is generally 3 years, 6 if substantial omissions, indefinite for fraud):

• ●All medical receipts: keep until you take the matching withdrawal, plus 7 years
• ●Form 8889 (filed): 7 years
• ●1099-SA, 5498-SA, W-2: 7 years
• ●HSA account statements: 7 years past account closure

If you use the delayed reimbursement strategy, keep receipts longer. The entire holding period plus 7 years after the eventual withdrawal. That can mean keeping receipts for 30+ years.

Digital copies are fine. The IRS accepts scanned receipts. Tripl stores them indefinitely with a backup to your own Google Drive or Dropbox.

2026 Important Dates

The contribution deadline is the same as the tax filing deadline. Filing an extension does NOT extend the contribution deadline. Money must be in the HSA by April 15.

Quick Decision Trees

Should I contribute more this year?

• ●Are you on an HDHP? -> If no, stop. You cannot contribute.
• ●Have you hit the limit? -> If yes, stop. Excess contributions get penalized.
• ●Self-only or family coverage? -> $4,400 or $8,750.
• ●Age 55+? -> Add $1,000.
• ●Did your employer contribute? -> Subtract from your personal contribution.

Can I pay this with my HSA?

• ●Is it on the eligible expenses list? -> If yes, yes.
• ●Was it after the HSA was opened? -> If no, not eligible.
• ●Was it for you, spouse, or dependent? -> If no, not eligible.
• ●Do you have a receipt? -> If no, get one before paying.

Did I screw up Form 8889?

• ●Did you file it at all? -> If no, file an amended return.
• ●Did employer contributions show on W-2 Box 12 Code W? -> They count toward your limit.
• ●Did you double-count payroll deductions? -> Check with your tax software.
• ●Are you in CA or NJ? -> Add it back to state income.

Why Tracking Matters

Every receipt is a future tax-free withdrawal. Every untracked expense is a tax-free withdrawal you cannot prove.

The IRS does not track receipts for you. Your HSA provider does not track receipts for you. You track receipts. Or you lose the ability to use them.

Tripl exists for this exact reason. Snap a photo, the receipt gets parsed and stored, and the matching tax-free withdrawal is logged forever. Backup to Google Drive or Dropbox so the data lives outside one provider.

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*Brandon Nied is the founder of Tripl. He is not a CPA, CFP, or licensed financial advisor. This post reflects research and personal experience tracking HSA expenses for a family of five. Always confirm tax positions with a qualified professional.*

*This is educational content, not financial or tax advice. Consult a qualified professional before making decisions about your HSA.*