Should You Pay for Knee Surgery with Your HSA - or Invest and Reimburse Later?
Knee surgery ranges from arthroscopic procedures to total knee replacement. Even after insurance, out-of-pocket costs can reach your annual deductible maximum or higher.
Knee Surgery typically costs $25,000
Range: $15,000 – $35,000. Here's how each strategy plays out.
Side-by-Side Comparison
| Pay with HSA Now | Pay Cash, Reimburse Later | |
|---|---|---|
| Out-of-pocket today | $0 | $25,000 |
| HSA balance impact | -$25,000 | No change |
| Tax savings | $7,500 (immediate) | $7,500 (when you reimburse) |
| HSA value in 10 years | $0 from this expense | +$24,179 in growth |
| HSA value in 20 years | $0 | +$71,742 in growth |
The Verdict
For a $25,000 expense like Knee Surgery, the shoebox strategy wins if you can afford to pay out of pocket. By keeping that $25,000 invested in your HSA at 7% annual returns, you could earn an additional $24,179 over 10 years or $71,742 over 20 years - all tax-free.
You still get the same $7,500 tax deduction either way. The only difference is when you take it. Meanwhile, your HSA money compounds untouched.
Key Assumptions
7% annual return
Based on historical stock market average returns
30% combined tax rate
Federal + state income tax + FICA
Compounding annually
Actual returns will vary year to year
When to Pay with Your HSA Instead
The shoebox strategy is not for everyone. Paying directly with your HSA makes more sense when:
- You do not have cash on hand. If paying $25,000 out of pocket would strain your budget or emergency fund, use your HSA. That is what it is for.
- The amount is small. For expenses under $200-300, the potential investment growth may not be worth the effort of saving receipts and tracking reimbursements.
- You need the money now. If you are facing a financial emergency or carrying high-interest debt, preserving cash by using your HSA is the smarter move.
- You are not investing your HSA. The shoebox strategy only works if your HSA is invested. Money sitting in a savings account earning 0.1% does not benefit from deferral.
Frequently Asked Questions
Is knee surgery HSA-eligible?
Yes. All medically necessary surgical procedures, including knee surgery, are qualified medical expenses under IRS rules.
Does physical therapy after knee surgery also qualify?
Yes. Post-surgical physical therapy, prescription medications, and medical equipment like crutches or braces are all HSA-eligible.
What is the investment potential of deferring $25,000 in HSA reimbursement?
At 7% annual returns, $25,000 invested for 10 years could grow to about $49,178 - a gain of roughly $24,178. Over 20 years, it could reach about $96,742.
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This comparison is for informational purposes only. Actual costs, returns, and tax savings will vary based on your individual situation. Consult a tax advisor for personalized guidance. Cost estimates are based on national averages as of 2026.
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