Yes — and stacking both is a quietly powerful tax move. A general-purpose FSA disqualifies you from contributing to an HSA. A Limited Purpose FSA (LPFSA) doesn't. Here's how the LPFSA works, what it covers, and when running both accounts beats running just one.
What an LPFSA Actually Is
An LPFSA is a Flexible Spending Account that's restricted to two categories: dental and vision expenses (and, in some plans, post-deductible medical). Because it doesn't pay for first-dollar medical care, the IRS allows it to coexist with an HSA. You contribute pre-tax dollars from payroll, and the funds are usually use-it-or-lose-it (subject to your employer's grace period or carryover rules).
Side-by-Side Comparison
| Feature | HSA | LPFSA |
|---|---|---|
| 2026 contribution limit | $4,400 self / $8,750 family | ~$3,300 (employer-set, IRS cap) |
| Eligible expenses | All Pub 502 medical | Dental and vision only |
| Rolls over? | Yes, forever | Use-it-or-lose-it (with limited carryover) |
| Investable? | Yes | No |
| Owned by | You | Employer |
| Funds available | As contributed | Full annual amount day 1 |
| Disqualifies HSA? | N/A | No (unlike a general FSA) |
The Stacking Strategy
For someone with predictable annual dental and vision spending, stacking both accounts looks like this:
- Estimate your annual dental + vision spend. Cleanings, fillings, glasses, contacts, exams.
- Fund the LPFSA with that amount. Don't over-fund — anything left at year-end (beyond the carryover) disappears.
- Max the HSA. Use it for everything else and treat it as a long-term investment account.
- Use LPFSA dollars first when paying dental/vision bills, since those funds have a deadline. Save HSA receipts for the shoebox strategy.
When the LPFSA Wins
- Big dental or vision year ahead. Braces, implants, LASIK — the LPFSA gives you the entire annual amount on day 1, even before you've contributed it. See is LASIK HSA-eligible.
- You want to preserve the HSA balance for retirement. Every dollar of dental/vision spending that comes from the LPFSA is a dollar that stays invested in the HSA. Run the long-term math in the HSA ROI calculator.
- You're a high earner and need every tax-advantaged dollar you can find. The LPFSA's $3,300 limit is on top of the HSA's $4,400/$8,750.
When to Skip the LPFSA
- You don't reliably spend on dental and vision. Use-it-or-lose-it bites — guess too high and you forfeit the unused amount.
- Cash flow is tight. The LPFSA reduces your paycheck before you spend the money. The HSA does the same, but its funds roll forward forever — money in the LPFSA can vanish.
- Your employer doesn't offer one. You can't open an LPFSA on your own; it has to come from your benefits package.
The Switching Trap
If you elected a general-purpose FSA last year, you may need to wait until the end of its grace period (usually March 15) before becoming HSA-eligible — even if you switched to an HDHP January 1. The general FSA's leftover balance counts as disqualifying coverage. Time the switch carefully or use the LPFSA from the start. See the HDHP rule checklist for the full disqualification rules.
The Bottom Line
If you have dental or vision costs you can predict, and your employer offers an LPFSA, fund both. If you don't, just max the HSA — it's the more powerful account on every dimension except day-1 cash availability. For deeper strategy, see HSA vs FSA and the year-end checklist, which covers the year-end LPFSA burn-down.