The 2027 HSA limit is $4,500 for self-only coverage and $9,000 for family coverage. If you switch to a PPO on January 1, 2027, your 2027 limit is $0. The account itself does not go anywhere.
Open enrollment is where this decision gets made. This post covers what changes for your HSA when you leave the HDHP. It also covers what stays exactly the same.
What Changes and What Does Not
| What changes | What does not |
|---|---|
| No new contributions for months you are not HSA-eligible | The account and the balance stay yours |
| Employer deposits stop | Invested money keeps growing tax-free |
| A 2026 last-month rule contribution can become taxable | Tax-free spending on qualified medical expenses |
| A general-purpose FSA becomes an option | Old receipts can still be reimbursed |
The Account Stays Yours
IRS Publication 969 is direct about this. It says "An HSA is 'portable.'" The next sentence reads "It stays with you if you change employers or leave the work force."
Pub 969 also says "The contributions remain in your account until you use them." Nothing in that sentence depends on your health plan.
Growth keeps going too. Pub 969 says "Earnings on amounts in an HSA aren't included in your income while held in the HSA." If the balance is invested, it can stay invested.
You Can Still Spend It Tax-Free
Leaving the HDHP ends your ability to contribute. It does not end tax-free spending.
IRS Notice 2004-2 answers this exact question in Q&A 28. It names someone who "no longer has an HDHP" as an example. For that person, qualified medical distributions "continue to be excludable" from gross income.
Pub 969 adds the timing rule. It says "only those expenses incurred after you actually establish your HSA are qualified medical expenses." Bills you pay on the PPO count, because the HSA already exists.
The penalty for non-medical spending does not change either. Pub 969 says only amounts used for qualified medical expenses are tax free. The rest also owes a 20% additional tax, unless taken after you are disabled, reach age 65, or die.
No New Contributions for PPO Months
The HSA limit is figured one month at a time. The Form 8889 instructions have you enter 0 for any month you were not eligible on the first day. Then you add up the months and divide by 12.
That makes each eligible month worth one-twelfth of the annual limit.
| Year | Coverage | Annual limit | Per eligible month |
|---|---|---|---|
| 2026 | Self-only | $4,400 | $366.67 |
| 2026 | Family | $8,750 | $729.17 |
| 2027 | Self-only | $4,500 | $375 |
| 2027 | Family | $9,000 | $750 |
Switch to a PPO on January 1, 2027, and every 2027 month is a zero. That is a $0 limit for the year.
A mid-year switch uses the same math. Say a hypothetical employee keeps self-only HDHP coverage through June 2027. Six months at $375 is $2,250. On family coverage, six months at $750 is $4,500.
If you had HDHP coverage all of 2026, your 2026 limit is untouched. Notice 2004-2 puts the contribution deadline at "generally April 15 following the year." For 2026, that is April 15, 2027. Ask your HSA provider how to mark a deposit as a 2026 contribution.
The Last-Month Rule Trap
This section only matters if you joined the HDHP partway through 2026. It also requires that you contributed more than the monthly math allows.
The last-month rule lets you count as eligible for the whole year if you are eligible on December 1. That lets a mid-year joiner contribute the full annual limit. The catch is the testing period.
Pub 969 says the testing period "begins with the last month of your tax year." The same sentence says it "ends on the last day of the 12th month following that month." For a 2026 contribution, that runs from December 1, 2026, through December 31, 2027.
A PPO that starts January 1, 2027, breaks the testing period. Pub 969 says what happens if you fail it "for reasons other than death or becoming disabled." You include in income the contributions "that wouldn't have been made except for the last-month rule."
Pub 969 then adds two more sentences. "You include this amount in your income in the year in which you fail to be an eligible individual." And: "This amount is also subject to a 10% additional tax."
Here is the math for a hypothetical employee who started HDHP coverage on April 1, 2026. That is nine eligible months. They used the last-month rule to contribute the full 2026 limit. Then they switched to a PPO on January 1, 2027.
| Line | Self-only | Family |
|---|---|---|
| Full 2026 limit contributed | $4,400 | $8,750 |
| Nine-month limit (April to December) | $3,300 | $6,562.50 |
| Added to 2027 income | $1,100 | $2,187.50 |
| 10% additional tax | $110 | $218.75 |
Pub 969 says the income and the additional tax go on Form 8889, Part III. The extra tax is on top of regular income tax on the same amount.
If you have not hit the full amount yet, stop at the monthly-math number. If you already contributed it, talk to a tax professional before you file. If you had HDHP coverage all twelve months of 2026, none of this applies.
Employer Contributions Stop
Employer HSA money counts against the same annual limit as yours. Pub 969 says you must reduce what you can contribute by your employer's excludable contributions.
Notice 2004-2 covers the other side. Employer contributions become taxable to you if they are made for "an employee who is not an eligible individual." So the employer deposit is tied to your HDHP months.
Put that number in the plan comparison. Say your employer deposits a hypothetical $1,000 a year. That is $1,000 the PPO does not come with.
What to Do With the Balance
None of these moves require an HDHP.
- ●Keep it invested. Earnings stay out of your income while held in the HSA.
- ●Reimburse old receipts. Pub 969 says you can take a distribution "at any time." The same sentence says only amounts used for qualified medical expenses are tax free. The expense also has to come after the HSA was opened.
- ●Pay PPO-era bills from it. Copays, prescriptions, and dental work on the new plan can still qualify.
The records rule does not change either. Pub 969 requires records showing your distributions paid qualified medical expenses. Tripl stores those receipts and tracks what you can still reimburse tax-free.
A General-Purpose FSA Is Fine Now
Pub 969 covers an employee with an HDHP plus a health FSA that reimburses qualified medical expenses. That employee "can't generally make contributions to an HSA." That rule is about contributing. On a PPO, you are not contributing anyway.
So a general-purpose health FSA in the new plan does not hurt the HSA you already have. Notice 2004-2 Q&A 28 still covers the balance.
One rule to watch is double-dipping. Pub 969 requires records showing the expense "hadn't been previously paid or reimbursed from another source." A bill the FSA pays cannot also come out of the HSA.
When Leaving the HDHP Makes Sense
The HSA is one line in the comparison. The real number is total yearly cost under each plan. That is premiums, plus the care you expect, minus the HSA tax savings and any employer deposit.
Leaving can make sense when:
- ●The PPO total comes out lower after you count the lost employer deposit
- ●You cannot cover the HDHP deductible in cash (the 2027 minimum is $1,750 self-only, $3,500 family)
- ●A doctor you need is in the PPO network but not the HDHP network
- ●A planned surgery or birth would cost you less under the PPO, even after the HSA savings
If you return to an HDHP later, contributions restart for each eligible month. The monthly math works the same in reverse.
The HSA does not close when the HDHP ends. The 2026 contribution window closes April 15, 2027.
Related Reading
- ●Switching From PPO to HDHP: A First-Year Survival Guide
- ●The HSA Last-Month Rule: A Full Year From One Month of Coverage
- ●HSA Job Change Rules: Keep the Money, Avoid the Excess Penalty
- ●Do HSA Funds Expire? No. Here Is Why That Matters.
- ●How to Compare Health Plans in 5 Minutes
This is educational content, not financial or tax advice. Consult a qualified professional before making decisions about your HSA.