# What is a health savings account (HSA)?

Source: https://www.getprescience.com/guides/what-is-an-hsa
Author: Aditya Jain, MD, Cofounder and COO, Prescience
Published: 2026-10-04
Updated: 2026-10-13
Cite as: Aditya Jain, MD. "What is a health savings account (HSA)?." Prescience, October 13, 2026. https://www.getprescience.com/guides/what-is-an-hsa

A health savings account (HSA) is an individually owned account with federal tax advantages for qualified medical expenses. Contributions require HSA-eligible coverage and other eligibility conditions. For a fully eligible person in 2026, the limit is $4,400 for self-only coverage or $8,750 for family coverage, including employer contributions.

- **2026 limit, self-only:** $4,400
- **2026 limit, family:** $8,750
- **Catch-up (55+):** +$1,000
- **2026 HDHP minimum deductible:** $1,700 / $3,400

## How an HSA works

An HSA pairs with a high-deductible health plan (HDHP). You, your employer or both put money in. You spend it on qualified medical expenses, from doctor visits and prescriptions to dental and vision care, or you let it grow. The money is yours: it stays with you when you change jobs and never expires.

I value the combination of federal benefits: eligible contributions are excluded or deductible, earnings grow tax-free, and qualified withdrawals are tax-free. State rules may differ. Nonqualified withdrawals can be taxable, so the account is not a blanket exemption for any spending.

- **Anyone can contribute for you:** you, your employer or a family member. All of it counts toward one annual limit.
- **You choose when to spend it.** IRS Publication 969 lets you take tax-free money out for qualified expenses you had after you opened the HSA, and you don't have to take it out in the same year. Keep the receipts.
- **You may be able to invest it.** Some custodians offer investments, with their own cash minimums, fees and investment choices. Money invested can lose value, so keep expected near-term medical spending accessible.
- **After 65 it behaves like a traditional IRA.** Withdrawals for non-medical spending are taxed as income but no longer carry the 20% penalty. Before 65, non-medical withdrawals are taxed and penalized 20%, unless you're disabled.
- **Some premiums are allowed.** HSA money can pay COBRA premiums, coverage while you collect unemployment, qualified long-term care insurance within age-based annual limits and, from 65, Medicare premiums (not Medigap). Ordinary premiums are not qualified expenses.

## 2026 HSA limits

_Chart: 2026 HSA limits for full-year eligible individuals: $4,400 self-only, $8,750 family, plus $1,000 for an eligible person age 55+ at year-end._

**IRS limits for 2026 (Revenue Procedure 2025-19)**

|  | Self-only | Family |
| --- | --- | --- |
| HSA contribution limit | $4,400 | $8,750 |
| Catch-up contribution, age 55+ | +$1,000 | +$1,000 |
| HDHP minimum deductible | $1,700 | $3,400 |
| HDHP out-of-pocket maximum | $8,500 | $17,000 |

Employer and employee contributions count toward the same limit. If your employer puts in $1,000 and you have self-only coverage, you can add $3,400 more. You have until the tax filing deadline to contribute for a year, so 2026 contributions can be made until April 15, 2027.

The limit depends on the coverage you have, not on how many people live in your house. Family coverage means the HDHP covers you and at least one other person. If you switch from self-only to family coverage partway through the year, the limit is figured month by month (or with the last-month rule below).

## What changed for 2026

The One, Big, Beautiful Bill Act widened HSA eligibility starting January 1, 2026:

- **Bronze and catastrophic individual plans** now count as HSA-compatible, even if they don't meet the usual HDHP definition. The relief covers qualifying individual-market plans available through an Exchange, including off-Exchange purchases, with IRS good-faith relief described in Notice 2026-5. It does not make every employer bronze plan eligible.
- **Direct primary care:** certain qualifying arrangements no longer block contributions from January 1, 2026. To preserve contribution eligibility, aggregate monthly fees cannot exceed $150 for one person or $300 for an arrangement covering more than one person. Services must meet the statutory definition; not every concierge membership qualifies. Qualified DPC fees can be paid from an HSA even when the fee exceeds that eligibility threshold, but employer-paid fees cannot also be reimbursed tax-free.
- **Telehealth before the deductible** is permanently allowed without breaking HSA eligibility, for plan years starting on or after January 1, 2025.

The limits themselves rose by the usual inflation step: $100 for self-only coverage (from $4,300) and $200 for family coverage (from $8,550). The catch-up amount is set by statute and stays at $1,000.

## What an HSA saves you in real dollars

The savings depend on your tax bracket and on how the money goes in. Contributions through payroll under your employer's cafeteria plan avoid federal income tax and applicable FICA, generally 7.65% below the Social Security wage base. Contributions you make on your own at your bank are deductible on your return, but you still paid FICA on that pay. That difference is worth using payroll if you can.

**Single engineer maxing out through payroll**

Illustrative. A single employee with self-only HDHP coverage earning $140,000 in 2026, in the 24% federal bracket, living in a state with a 5% income tax that follows federal HSA rules. Assume she is HSA-eligible all year, has no other contributions and contributes $4,400 through a compliant cafeteria plan.

- Contribution: $4,400
- Federal income tax avoided (24%): $1,056
- Social Security and Medicare avoided (7.65%): $337
- State income tax avoided (5%): $220

About **$1,613** less tax in one year, a 37% discount on every dollar she spends on care. Paid instead from her own bank account and deducted at tax time, she'd save about $1,276 (no FICA savings).

**Family saving for future qualified expenses**

Illustrative. A fully eligible couple contributes an assumed constant $8,750 at each year-end for 15 years, makes no withdrawals and earns 6% annually before any fees. Returns and future contribution limits are not guaranteed.

- Yearly contribution: $8,750
- Years: 15
- Total put in: $131,250
- Balance at 6% a year: About $203,665

Contributions total $131,250 and hypothetical growth is about $72,415. Actual results depend on investment performance, fees and withdrawals. Federal tax-free treatment requires qualified expenses; ordinary nonmedical withdrawals are taxable even after age 65.

> **California doesn't follow the federal rules:** California does not recognize HSAs for state tax. Employer contributions are added back to state income, and interest, dividends and realized investment gains can be subject to state tax. The federal savings still apply. Check your own state before you count the state line in the example above.

## Eligibility edge cases that trip people up

You're eligible for a month if, on the first day of that month, you're covered by an HSA-eligible plan, you have no disqualifying other coverage, you're not enrolled in Medicare and nobody can claim you as a dependent. Most mistakes come from the second and third conditions.

**Situations that change what you can contribute**

| Situation | What happens to your HSA |
| --- | --- |
| You enroll in Medicare (Part A, B or both) | Your limit is zero from the first month you're enrolled. You keep and can spend the existing balance. |
| You apply for Medicare or Social Security after 65 | Premium-free Part A starts up to 6 months before you sign up (never before the month you turned 65). Contributions in those backdated months become excess contributions. |
| Your spouse has a general-purpose health FSA | If that FSA can pay your medical bills, you're not eligible, even though it's your spouse's employer's plan. A limited-purpose (dental and vision) FSA is fine. |
| You had a general-purpose FSA last year with a carryover | The carryover keeps you covered by that FSA into the new year and can block HSA eligibility unless the employer converts it to limited-purpose. |
| You join an HDHP mid-year | Prorate by month, or use the last-month rule if you're eligible on December 1 and stay eligible through the next year. |
| You use VA care for a service-connected disability | Doesn't disqualify you, per IRS Publication 969. |
| Both spouses are 55 or older | Each can add the $1,000 catch-up, but only into their own HSA. There are no joint HSAs. |
| Your adult child (under 26) is on your family plan | If they cannot be claimed as anyone’s tax dependent and meet all other eligibility rules, they can contribute to their own HSA based on their family coverage and eligible months. |

**The Medicare month-by-month limit**

An employee turns 65 on July 15, 2026, has otherwise qualifying self-only HDHP coverage and has Medicare effective July 1. The IRS prorates the limit by the months before Medicare.

- 2026 self-only limit plus catch-up: $5,400
- Eligible months (January–June): 6 of 12
- Calculation: $5,400 × 6 ÷ 12

His 2026 limit is **$2,700**, including anything his employer contributes. If he works past 65 and delays Medicare, he can keep contributing, but he should stop at least 6 months before he applies so the backdated Part A doesn't create excess contributions.

**The last-month rule and its trap**

An employee under 55 first becomes HSA-eligible on December 1, 2026 with family HDHP coverage. Under the last-month rule, eligibility on December 1 can allow a full-year contribution, subject to the testing period.

- Contribution allowed for 2026: $8,750
- Testing period: December 1, 2026 to December 31, 2027
- If she becomes HSA-ineligible in June 2027: Fails the test
- Amount added back to income: $8,750 − ($8,750 × 1 ÷ 12) ≈ $8,021

She'd owe income tax on about $8,021 plus a **10% additional tax**. Use the last-month rule only if you're confident you'll stay HSA-eligible for the whole next year. Death or disability doesn't trigger the penalty.

Excess contributions cost 6% a year until you fix them. If you catch the mistake by your tax return due date, including extensions, ask your HSA provider to remove the excess and its earnings.

## The catch: the deductible

An HSA balance and insurance coverage solve different budgeting problems. A qualifying HDHP generally has a deductible of at least $1,700 self-only or $3,400 family in 2026, subject to exceptions including the new individual bronze and catastrophic rules. You can keep an existing HSA without qualifying to make new contributions. Before choosing a plan, compare available cash with early-year medical exposure, not just the potential tax deduction.

An HSA can be useful for people with frequent or infrequent care needs. Compare premiums, covered services, employer contributions and the out-of-pocket maximum. A person with substantial expected care should not reject an HDHP solely because of the deductible, or select it solely for the tax benefit. The total annual cost and timing of bills determine whether it fits.

## How employers can make the deductible disappear

Employers can contribute to employees' HSAs too, and those dollars can cover the deductible so employees don't feel it. Employer money in an HSA belongs to the employee, so it's a benefit people actually notice. KFF's 2025 survey put the average employer HSA contribution at $690 a year for single coverage and $1,296 for family coverage, counting employers that give nothing.

**Common employer HSA contribution strategies**

| Strategy | How it works | Trade-off |
| --- | --- | --- |
| **Flat seed** | Same dollar amount for everyone in a coverage tier, e.g., $750 single and $1,500 family | Simple and fair; doesn't reward saving |
| **Match** | Match employee contributions up to a cap, e.g., 50% up to $1,000 | Rewards savers; lower earners often get less. Must run through a cafeteria plan |
| **Fund the deductible** | Contribute enough to cover all or most of the deductible | Offsets eligible expenses without changing the insurance deductible; uses more employer budget |
| **Front-load in January** | Deposit the full year on day one | Money is there for an early-year bill; the balance generally stays with the employee after departure, subject to narrow correction rules |
| **Per paycheck** | Spread contributions over the year | Lower risk for the employer; an early surgery can outrun the balance |

- **Comparability rules.** Contributions made outside a cafeteria plan generally must meet statutory comparability rules: the same dollar amount or the same percentage of the deductible for comparable participating employees. Coverage and employment categories matter, and special rules permit larger contributions for non-highly compensated employees. Breaking the rule triggers a 35% excise tax on what you contributed. Contributions through a cafeteria plan, including matches, are exempt from comparability but must pass cafeteria plan nondiscrimination tests.
- **Payroll taxes.** Employer HSA contributions aren't wages for income tax, Social Security, Medicare or FUTA. Payroll tax savings depend on wage levels and employee eligibility; ordinary employee rules do not apply to every owner.
- **Report it.** Employer contributions, including employee pre-tax deferrals, go on the W-2 in box 12, code W.
- **Owners are different.** More-than-2% S corporation shareholders and partners can't receive pre-tax employer HSA contributions the same way employees do. Their contributions are treated as pay, which they can then deduct on their own return.

**What seeding HSAs costs a 15-person team**

Illustrative. A 15-person company on an HSA-eligible plan: 9 employees with single coverage, 6 with family coverage. Assume all are eligible all year and below the Social Security wage base, with no disqualifying owner status. It seeds $750 for single and $1,500 for family, through payroll.

- Single: 9 × $750: $6,750
- Family: 6 × $1,500: $9,000
- Total employer contribution: $15,750
- Payroll tax avoided vs. paying it as bonus (7.65%): $1,205

The $750 single deposit covers about 44% of a $1,700 deductible; the $1,500 family deposit covers about 44% of a $3,400 family deductible. Funding the full minimum deductibles would cost $35,700 ($1,700 × 9 plus $3,400 × 6), which is why many teams look at plan designs with lower deductibles instead.

At Prescience, we design and run your company's health plan, from setup and enrollment to claims, compliance and COBRA. What your team gets:

- **An effective $0 deductible,** so the plan helps from the first visit.
- **Simple copays** shown before a visit, capped by a low out-of-pocket maximum.
- **A broad national PPO network,** plus providers we contract with directly.
- **24/7 physician-led care navigation:** a care team that finds the right provider, books appointments and explains costs up front.

What your company gets: one monthly cost set in your quote, usually 10–20% below comparable fully insured coverage and fixed before the plan starts, with no admin fees. You keep your payroll provider, and the plan can start mid-year.

> **Prescience Diamond: A company health plan with an effective $0 deductible.** Seeding everyone's HSA to cover a $1,700 deductible gets expensive fast, as the example above shows. Diamond starts from an effective $0 deductible, so there's no gap to fill.
> - **An effective $0 deductible** and simple copays shown before a visit
> - **A broad national PPO network,** plus providers we contract with directly
> - **24/7 physician-led care navigation** that books visits and explains costs
> - **Usually 10–20% below comparable fully insured coverage,** fixed in your quote, with no admin fees
> Best for teams of about 15 or more that want one great group plan. [Get a Diamond quote](https://www.getprescience.com/get-started?p=Employer&product=diamond)

Do not assume a Prescience proposal permits HSA contributions from the deductible description alone. Ask for a written eligibility determination for the actual coverage. Existing HSA funds remain yours even when new contributions are unavailable. Compare any tax advantage with premiums, copays and practical access to care.

## HSA vs. FSA vs. HRA

**The three common health accounts in 2026**

|  | HSA | Health FSA | HRA |
| --- | --- | --- | --- |
| Who funds it | Employee and employer | Mostly employee | Employer only |
| Who owns it | Employee | Employer plan | Employer plan |
| 2026 limit | $4,400 self-only, $8,750 family | $3,400 per employee in salary reductions | Set by the employer (QSEHRA capped at $6,450 / $13,100) |
| Rolls over | Yes, forever | Up to $680 carryover, or a grace period, if the plan allows | Per plan design |
| Needs an HDHP | Yes (or an eligible bronze/catastrophic plan) | No | No |
| Can be invested | Yes | No | No |
| Leaves with the employee | Yes | No (COBRA may apply) | No, unless the plan allows |

You can pair an HSA with a limited-purpose FSA for dental and vision costs and stay eligible. A general-purpose FSA or HRA that pays medical bills before the deductible disqualifies you. For what each account can pay for, see [HSA and HRA eligible expenses](https://www.getprescience.com/guides/hsa-hra-eligible-expenses).

## How to open and use an HSA

1. **Confirm your plan qualifies** Check whether the plan meets all HDHP requirements, including the out-of-pocket limit and restrictions on early benefits, or qualifies for the individual bronze/catastrophic exception. A large deductible alone does not establish HSA eligibility.
2. **Check for disqualifying coverage** Ask your spouse whether they have a general-purpose health FSA. Check whether you're enrolled in any part of Medicare or about to apply.
3. **Open the account** Use your employer's HSA provider if it offers payroll deductions, since that saves FICA tax. Otherwise any bank or brokerage that offers HSAs works. Compare monthly fees and investment options.
4. **Set your contribution** Subtract your employer's contribution from the limit, then choose a per-paycheck amount. You can change it during the year.
5. **Decide: spend or invest** Keep enough cash for your deductible. If you can, pay small bills out of pocket, keep the receipts and invest the rest.
6. **File Form 8889** Report contributions and withdrawals on Form 8889 with your tax return. Your provider sends Form 5498-SA and Form 1099-SA.

## Frequently asked questions

**What is the HSA contribution limit for 2026?**

$4,400 for self-only coverage and $8,750 for family coverage, plus a $1,000 catch-up if you're 55 or older. Employer contributions count toward the limit.

**Who is eligible for an HSA?**

You need HSA-eligible coverage, generally a high-deductible health plan with at least a $1,700 deductible for self-only coverage in 2026, and no other disqualifying coverage. You can't be enrolled in Medicare or be someone else's tax dependent. From 2026, bronze and catastrophic individual plans also qualify.

**What happens to my HSA if I leave my job?**

It stays with you. The money is yours, including what your employer contributed, and you can keep spending or investing it. You can also use it to pay COBRA premiums.

**Can an employer pay my deductible with an HSA?**

Yes. Employer HSA contributions can cover the deductible, and they count toward the annual HSA limit. They aren't taxed as wages.

**Can I use an HSA for direct primary care?**

From 2026, certain defined DPC arrangements qualify. The $150 individual/$300 multiple-person monthly thresholds protect eligibility to contribute; qualified DPC fees above those thresholds can still be paid from existing HSA funds under IRS guidance. Employer-paid fees cannot be reimbursed again.

**Can I contribute to an HSA if my spouse has an FSA?**

Not if your spouse's FSA is general-purpose and can pay your medical expenses. The IRS treats that as disqualifying coverage. If the FSA is limited to dental and vision, you can still contribute.

**Can I keep contributing to an HSA after 65?**

Only if you're not enrolled in any part of Medicare. Once you apply, premium-free Part A can be backdated up to 6 months, so stop contributing at least 6 months before you sign up.

**What if I contributed too much?**

Excess contributions are taxed 6% a year while they stay in the account. Ask your HSA provider to withdraw the excess and its earnings by your tax return due date, including extensions to avoid the 6% tax.

**What is the deadline for 2026 HSA contributions?**

Your tax filing deadline, which is April 15, 2027 for most people. Tell your HSA provider the deposit is for 2026.

## Sources

- [IRS Revenue Procedure 2025-19, 2026 HSA and HDHP limits](https://www.irs.gov/pub/irs-drop/rp-25-19.pdf)
- [IRS Publication 969, HSA eligibility, contributions and distributions](https://www.irs.gov/publications/p969)
- [IRS Notice 2026-5, new HSA eligibility rules](https://www.irs.gov/irb/2026-02_IRB)
- [IRS Publication 15-B (2026), fringe benefits and owner exceptions](https://www.irs.gov/publications/p15b)
- [IRS Revenue Procedure 2025-32, 2026 tax adjustments](https://www.irs.gov/pub/irs-drop/rp-25-32.pdf)
- [Medicare, when coverage starts](https://www.medicare.gov/basics/get-started-with-medicare/sign-up/when-does-medicare-coverage-start)
- [California FTB, Schedule CA instructions and HSA adjustments](https://www.ftb.ca.gov/forms/2025/2025-540-ca-instructions.html)
- [KFF, 2025 Employer Health Benefits Survey (original survey and methodology)](https://www.kff.org/health-costs/2025-employer-health-benefits-survey/)