● Money & small business
HSA: pay medical bills from it, or pay yourself and save the receipts?
A health savings account can pay medical bills as they come, or you can pay them from other money, keep the receipts, and leave the HSA invested. Qualified expenses can be reimbursed from an HSA years later, as long as they were incurred after the account was opened and you keep the records. Here's what the two approaches do over 30 years, from the sample file of our HSA planner. Every figure comes from the same year-by-year model, which was checked independently. The inputs are examples, not a forecast.
The example
- Age 35, family coverage, $3,200 in the HSA, contributing until 65.
- The employer puts in $1,000 a year; the saver contributes the rest of the limit: $7,750 this year (the 2026 family limit is $8,750, +$1,000 from age 55).
- $1,800 a year of medical costs. Contributions, limits and medical costs grow with 3% inflation; the account earns 6% a year; tax rate 30%.
The two ways, by 65
| Pay bills from the HSA | Pay yourself, save receipts | |
|---|---|---|
| You put in (30 years) | $389,415 | $389,415 |
| Employer put in | $47,575 | $47,575 |
| Tax saved on your contributions | $116,824 | $116,824 |
| Medical bills paid from the HSA | $85,636 | $0 |
| HSA at 65 | $813,546 | $1,012,519 |
| ... in today's dollars | $335,170 | $417,145 |
| Receipts you can reimburse later, tax-free | $0 | $85,636 |
The HSA ends up $198,973 bigger when the bills are paid from other money. $85,636 of that is simply the bills themselves, which the receipts let you take back out tax-free whenever you want. The other $113,337 is what those bills would have earned if they'd stayed invested for the rest of the 30 years.
What that comparison leaves out
Paying yourself isn't free: it takes $85,636 of other money over 30 years. If that money would otherwise have been invested in a taxable account, it would have grown too, and its growth would have been taxed. The receipts approach wins because the HSA's growth is tax-free for medical costs, not because the money appears from nowhere. It only makes sense if you can pay the bills comfortably without the HSA, and if you keep the receipts safe for decades.
A smaller budget: self-only, $3,000 a year
Same model, self-only coverage, $3,000 a year contributed (growing with inflation), $500 a year from the employer, $1,200 a year of medical costs:
| Pay bills from the HSA | Pay yourself, save receipts | |
|---|---|---|
| HSA at 65 | $272,623 | $405,273 |
| Receipts to reimburse later | $0 | $57,090 |
| Tax saved on your contributions | $42,818 | $42,818 |
Starting later
Family coverage, the same maximum contributions and $1,800 of yearly bills, only the starting age changes:
| Start at | HSA at 65, bills paid from it | HSA at 65, receipts saved | Receipts | Tax saved |
|---|---|---|---|---|
| 35 | $813,546 | $1,012,519 | $85,636 | $116,824 |
| 45 | $354,855 | $438,916 | $48,367 | $67,096 |
| 55 | $124,168 | $150,983 | $20,635 | $30,093 |
Running your own numbers
- Check your coverage type and the limit: 2026 is $4,400 self-only and $8,750 family, and your employer's money counts toward it.
- Decide what you can contribute. If you can, at least take any employer money, and check whether your state taxes HSA contributions (a few do).
- Decide how you'll pay medical bills. If you pay them yourself, keep every receipt with the date and the amount; the reimbursement is only tax-free for qualified costs you can document.
- Invest the part of the HSA you won't need soon; cash sitting in the account doesn't grow.
To run your own figures now, the free HSA calculator uses the same model. Every figure above is from the sample file of our HSA planner and the same model, checked year by year against an independent calculation. Projections, not tax advice.