Self-Employed HSA Calculator (2026)

The 2026 numbers

The contribution limits for 2026 are $4,400 for self-only coverage and $8,750 for family coverage, with an extra $1,000 from age 55. That catch-up figure is set in statute and is not indexed, so it has been $1,000 for many years and will stay there until Congress changes it.

To contribute at all you need a qualifying high deductible health plan: for 2026 a deductible of at least $1,700 self-only or $3,400 family, with out-of-pocket costs capped at $8,500 and $17,000. And the limit is prorated by the months you were eligible, counted by whether you were eligible on the first day of each month.

What changed on 1 January 2026

This is the reason the page exists. Under IRS Notice 2026-05, issued in December 2025 to implement OBBBA, bronze and catastrophic plans available through an Exchange are treated as HSA-compatible from 1 January 2026 — regardless of whether they meet the ordinary deductible tests. A great many self-employed people buy exactly those plans and have never been able to pair one with an HSA. Now they can.

The same legislation made the telehealth safe harbour permanent, so a plan covering remote care before the deductible no longer breaks your eligibility, and it brought qualifying direct primary care arrangements inside the tent — you can be enrolled in one and still contribute, subject to a cap on the monthly fee, and the fees themselves became a qualified expense.

Why it is worth more to you than the tax table suggests

The obvious benefit is the deduction: contribute $4,400 in the 22% bracket and you save $968 in federal tax, plus whatever your state charges. That is the number every HSA article stops at.

The larger one, if you buy your own health insurance, is what it does to your modified adjusted gross income. The HSA deduction is above the line, on Schedule 1 — so it reduces the income the ACA premium tax credit is measured against. And since the 400% subsidy cliff returned for 2026, a contribution that carries you back under the line does not merely save tax at your marginal rate. It restores the entire year's credit.

That makes an HSA contribution a second lever alongside a retirement contribution, and a cheaper one to reach for, because the money stays available for medical costs rather than being locked up until 59½. If you are a few thousand dollars over the cliff, filling the HSA first is usually the right order.

The part that is worse for the self-employed

Now the honest half, and it is the mirror image of the health insurance deduction.

An HSA contribution is an above-the-line income tax deduction. It is not a business expense, it does not go on Schedule C, and it therefore does not reduce your self-employment tax by a single cent. An employee who contributes the same amount through a payroll cafeteria plan avoids Social Security and Medicare tax on it — roughly 7.65% of every dollar, and their employer saves the same again.

So on a $4,400 contribution, an employee is about $337 better off than you for doing exactly the same thing. There is no structure available to a sole proprietor that closes this gap. It is one of the few places where self-employment is simply worse, and it is worth knowing rather than discovering. If your profit is high enough that an S-corporation or a different plan structure is on the table, this is one of the several small asymmetries that add up on that side of the ledger.

Proration and the trap in the last-month rule

If you were eligible for only part of the year, your limit is that fraction of the annual figure. Six months of self-only coverage means $2,200, not $4,400.

There is an exception, and it bites people. Under the last-month rule, if you are eligible on 1 December you may contribute the full annual amount for that year regardless of how few months you were actually covered. The catch is the testing period: you must remain HSA-eligible for the whole of the following calendar year. If you do not — you take a job with a traditional plan, you go on Medicare, you switch to a non-qualifying policy — the amount you contributed above your prorated limit is added back to your income and charged an additional 10%.

For someone with unpredictable working arrangements that is a real risk, not a theoretical one. The calculator shows both figures so you can decide with the numbers in front of you rather than discovering the testing period a year later.

Timing, states, and the long game

HSA contributions for a tax year can be made up to the filing deadline in April — but unlike a SEP-IRA, an extension does not extend the HSA deadline. If you file in October having not contributed by April, the window has closed.

A handful of states, California and New Jersey among them, do not recognise HSAs for state income tax. Contributions are still federally deductible there, but the state saving is zero and investment earnings inside the account are taxable at state level. Set the state rate to zero above if that is you.

Finally, the reason people call this the best account in the tax code: contributions are deductible, growth is untaxed, and withdrawals for qualified medical expenses are tax free — a combination no retirement account offers. There is no requirement to spend it in the year you contribute, and no deadline for reimbursing yourself, so a receipt kept from 2026 can be reimbursed decades later out of an account that has been compounding the whole time. After 65 non-medical withdrawals are simply taxed as income, like a traditional IRA, so the downside of over-funding it is small.

Frequently asked questions