The HSA Is A Retirement Account Wearing A Health Plan

I had a health savings account for four years and used it like a debit card. Dentist, glasses, an urgent care visit in 2019 that turned out to be nothing. Every December the balance was roughly where it started, and I felt fine about that, because that is what the card is for.

Then somebody showed me what the account is actually built to be, and I sat with a spreadsheet for an hour feeling slightly unwell.

Four years.

What an HSA actually is

An HSA is a health savings account. You can only open and fund one if you are covered by an HSA-qualified high deductible health plan, an HDHP, which is a plan with a deductible above a threshold and an out of pocket maximum below another one.

Your plan documents will say whether it qualifies. If they do not say, it almost certainly does not.

The account belongs to you, not your employer. Change jobs, lose the HDHP, retire, and the money stays yours forever. That alone makes it different from the flexible spending account it is constantly confused with.

Then there is the tax treatment, which is the reason anyone writes about these at all.

Three tax breaks, priced in dollars

Money goes in before income tax. Say you put $4,000 in through payroll in a year when your marginal federal rate is 22 per cent, meaning the next dollar you earn is taxed at 22 per cent. That is $880 you do not pay.

Payroll contributions also skip Social Security and Medicare payroll tax, which comes to 7.65 per cent on the employee side. Another $306. No other retirement account does this, which is the part almost nobody mentions.

So $4,000 into the account costs you about $2,814 of take home pay, in that illustration, before any state tax.

Second, it grows without tax. Interest, dividends and gains inside the account are not taxed and there is no annual form to file for them.

Third, withdrawals for qualified medical expenses come out tax free. A traditional 401k taxes you on the way out.

A Roth taxes you on the way in. An HSA does neither, as long as the money goes to medical costs.

The default that eats the whole thing

Here is what happened to my four years. Money went into the account and sat in a cash sweep earning something close to nothing, because that is where every HSA custodian puts it by default.

Investing the balance is a separate step. Usually it means clicking into an investment tab, sometimes it means opening a linked brokerage sub-account, and on some plans it means keeping a minimum in cash before anything can be invested at all. It is three clicks and nobody makes them, because the account arrived with a debit card attached and a debit card tells you what an account is for.

The difference between making those clicks and not making them is the entire article.

Twenty years of $4,000 is $80,000 of contributions. Invested at a 6 per cent example return it becomes $155,971. Spent as it arrives it becomes a filing cabinet of receipts and a flat line.

The flat line is not wrong, to be clear. If you need the money for the dentist, use it for the dentist.

This is not a lecture about the dentist. It is about the fact that the account has a second mode and the card hides it.

The receipt strategy

This is the mechanism that makes the second mode possible, and it is not a loophole. It is written into how the account works.

You can pay a qualified medical expense out of your own pocket today, keep the receipt, and reimburse yourself from the HSA later. There is no stated deadline on later, provided the expense was incurred after your HSA was established and you have not already claimed it somewhere else.

Five years later. Twenty.

Which means the $400 root canal you pay from checking in 2026 becomes a $400 tax free withdrawal you can take in 2046, while the $400 that would have left the HSA stays invested for twenty years instead.

The whole strategy is a folder. Scan every medical receipt, name the file with the date and the amount, put it somewhere that survives a laptop dying, and keep a running total in a spreadsheet. That total is the amount you are allowed to pull out tax free whenever you want it.

The burden of proof is yours, not the custodian's. Nobody checks at the time. Somebody might check later, so keep the folder properly.

What happens when you get old

Medical spending does not stop in retirement, it accelerates, so a large HSA in your sixties is the most obviously useful money you will own. Premiums for certain kinds of coverage, long term care premiums within limits, and the ordinary grind of dental and vision and prescriptions all qualify.

There is also an age past which non-medical withdrawals stop carrying the extra penalty and are simply taxed as ordinary income, which makes the account behave like a traditional retirement plan for anything left over. That age and that penalty are set in the tax code, they have been changed before, and you should confirm both before planning around them.

One rule that catches people: once you enrol in Medicare you can no longer contribute to an HSA, though you can keep spending the balance for as long as it lasts. If you are approaching that age and still working, the timing of enrolment and the timing of your last contribution need to be worked out together.

Four things that are not true about HSAs

• It is not a flexible spending account. An FSA is use it or lose it within the plan year apart from whatever carryover your employer permits, it belongs to the employer, and it cannot be invested.
• The money does not expire. There is no deadline, no annual sweep and no forfeiture. Unspent balances roll over forever.
• You do not need to stay on a high deductible plan to keep the account. You need the HDHP to contribute. Once the money is in, it stays yours regardless of what plan you move to.
• It is not only for big medical events. Qualified expenses cover a long and specific list, and the list is longer than most people assume. Publication 969 and the related IRS guidance are the authority, not the custodian's marketing page.

The decision this actually forces

Using the HSA as a retirement account requires paying your medical bills from ordinary money. That is a real cost and it is the reason this is not advice for everybody.

If a $1,200 emergency room bill would go on a credit card and stay there, take it from the HSA. A 24 per cent balance beats any tax advantage in existence, and the folder strategy is for people with the cash flow to run it.

If that bill would come out of savings without drama, pay it from savings, file the receipt, and leave the HSA alone.

Do this in the next ten minutes

Log into your HSA. Find out how much of the balance is sitting in cash, because almost certainly all of it is. Find the investment tab and see what the minimum cash balance requirement is, if there is one.

Then invest everything above that minimum into a broad, low cost fund of the sort you would use in a retirement account, and set future contributions to invest automatically so this is the last time you have to think about it.

And check one more thing while you are in there, because it is free money and it is easy to miss: whether your employer contributes to the HSA, and whether their contribution requires you to do anything first. Mine matched the first $500 for two years before I noticed.

Where it sits in the order

The HSA is not the first thing to fund. If your employer matches 401k contributions, take the full match before anything else, because an immediate 50 or 100 per cent on your own money is a return no tax treatment can compete with. And if you are carrying a card balance at 24 per cent, clear that first, since no tax break in existence pays 24 per cent guaranteed.

After those two the HSA is genuinely hard to argue with, because it is the only account that avoids tax at all three points and the only one that skips payroll tax on the way in.

Name a beneficiary this week

Five minutes, large consequence. If your spouse is named as beneficiary the account passes to them and stays an HSA with the whole treatment intact. If anybody else is named, the account generally stops being an HSA on the date of death and the balance becomes taxable income to that person in that year.

A $155,971 balance arriving as ordinary income in a single tax year is a very different thing from a $155,971 account. The form is somewhere on your custodian's site and it takes longer to find than to fill in.