An HSA keeps its balance because it is an individual account, not an annual employer spending allowance. IRS Publication 969 says, “The contributions remain in your account until you use them.” The account is also portable, so leaving an employer does not hand the balance back to the company.
Why HSA Funds Do Not Expire
Unused HSA money stays in the account at the end of the year and carries into the next one. You do not need to submit a form, make a rollover election, or spend a minimum amount by December 31.
Annual contribution limits control how much new money can enter an HSA. They do not cap the balance you can build over time. Interest and investment earnings can also remain in the account without current federal income tax while they stay there, although available investments, fees, and cash interest depend on your custodian.
That is a major difference from a health FSA. Under Publication 969's health FSA rules, an employer can add a carryover or grace period, but an HSA keeps the full unused balance. Our HSA vs FSA comparison covers the rest of the account differences, while the FSA rollover guide explains the FSA deadlines.
What Happens After a Job or Health-Plan Change?
Your existing HSA balance stays yours after a job or health-plan change. What can change is your right to make new contributions, which depends on your coverage and other eligibility rules for each month.
| Event | Existing HSA balance | New HSA contributions |
|---|---|---|
| December 31 | Full balance remains in the account | Allowed if you otherwise remain eligible |
| Leave your employer | Balance remains yours and spendable | Depends on your coverage, not whether a new employer sponsors the account |
| Switch to other health coverage | Balance remains available for qualified expenses | Limited to months when you meet HSA eligibility rules |
| Enroll in Medicare | Balance remains available for qualified expenses | Stop beginning with the first Medicare-covered month, including retroactive months |
You can keep the same custodian after leaving a job, or move the account later. You can also contribute directly instead of through payroll if you otherwise qualify. Publication 969 explains that direct contributions may still be deductible, while payroll contributions can follow different employment-tax rules.
If your eligibility changes during the year, use the month-by-month rules instead of assuming you receive the full annual limit. The 2026 and 2027 HSA contribution limits guide explains proration and the last-month rule.
Does an HSA Roll Over Automatically, or Do You Have to Transfer It?
Year-to-year retention is automatic and does not move the money anywhere. A transfer or rollover is a separate transaction used when you want to move money from one HSA custodian to another.
| Term | What happens | Federal timing or frequency rule |
|---|---|---|
| Year-to-year retention | Money stays in the same HSA after year-end | Automatic; no annual balance limit |
| Direct trustee transfer | Old custodian sends money directly to the new HSA custodian | Not treated as a rollover; no annual frequency limit |
| Indirect rollover | Distribution comes to you and you redeposit it into an HSA | Complete within 60 days; one rollover during a one-year period |
IRS Notice 2004-50 separates these mechanics. It permits one indirect rollover contribution during a one-year period, while direct trustee-to-trustee transfers are not subject to that limit. If you only want to keep your current balance past December 31, none of these steps is necessary.
Can You Save Old HSA Money for Future Medical Bills?
You can leave money in an HSA and reimburse yourself later for a qualified medical expense from an earlier year. The expense must have happened after the HSA was established, but federal guidance does not impose a deadline for taking the distribution.
IRS Notice 2004-50 says “there is no time limit on when the distribution must occur.” Keep records showing that the expense was qualified, was not reimbursed from another source, and was not claimed as an itemized deduction. A receipt file protects the tax-free reimbursement years later.
Where a Letter of Medical Necessity Fits
Keeping money indefinitely does not expand the qualified-expense rules. Some dual-use wellness purchases may qualify under Publication 502's medical-expense rules when their primary purpose is medical rather than merely beneficial to general health. A Letter of Medical Necessity documents that purpose for a specific person and condition; it does not expand the federal definition of medical care. Many administrators want the recommendation on file before you buy, so arrange the documentation first.
Option 1: Through Your Doctor
If you already see a provider for your health condition, ask whether they can issue the letter. It should identify the condition, explain the medical purpose of the purchase, and be signed and dated. Timing can range from the same day to a later follow-up, and you may owe a copay.
Option 2: Through Crates
Crates starts with a short health assessment. A licensed provider typically reviews it within 24 to 48 hours, and the letter is issued if you qualify. You can then buy from any retailer, keep the itemized receipt, and use Crates one-click reimbursement to send the claim to your administrator. Crates letters remain valid for 12 months and renew annually.
With Crates, you do not need a pharmacy prescription. The letter documents why the purchase has a medical purpose for you. The expense must still fit federal qualified-medical-expense rules and your administrator's claim procedures.
What Changes at Retirement, Age 65, and Medicare Enrollment?
Retirement does not close your HSA, and Medicare enrollment does not take away the balance. Medicare does stop new HSA contribution eligibility, while age 65 changes the tax consequence of a nonqualified withdrawal.
Before age 65, a distribution used for something other than a qualified medical expense is generally taxable and carries a 20% additional tax. Publication 969 says there is no additional tax after disability, age 65, or death. A nonqualified distribution after 65 is still included in income.
After the HSA owner reaches 65, Publication 969 permits HSA money to cover eligible Medicare and other health-insurance premiums, but not Medigap premiums. If you delay Medicare enrollment while working, watch the effective date. Medicare advises you and your employer to stop HSA contributions six months before retirement or an application for Social Security benefits because premium-free Part A can begin retroactively.
What Happens to Unused HSA Money When You Die?
The beneficiary designation controls what happens next. If your spouse is the named beneficiary, the account becomes your spouse's HSA and keeps its HSA status.
For a nonspouse beneficiary, Publication 969 says the account stops being an HSA at your death and its fair market value is generally taxable to that beneficiary for that year. Qualified medical expenses for the deceased account holder that the beneficiary pays within one year can reduce the taxable amount. If the estate is the beneficiary, the account value is included on the deceased holder's final return. Review the designation with your custodian whenever your family or estate plan changes.
