What is the difference between Form 1099-SA and Form 5498-SA?

I think the practical distinction is:

Form: What it tells you: 1099-SA: Distributions taken from the HSA; 5498-SA: Contributions, rollovers, and year-end account information

For example, suppose you contributed $4,000 to your HSA and withdrew $1,500 during the year.

Your 5498-SA may contain information about the contributions and account value, while your 1099-SA reports the $1,500 distribution.

The two forms therefore aren't duplicates.

Also remember that receiving a 1099-SA doesn't automatically mean the entire distribution is taxable. The tax treatment depends on how the distribution was used and the applicable HSA rules.

One thing that confused me was why my 5498-SA arrived later than my other tax forms.

That's normal.

The IRS instructions say Form 5498-SA is generally furnished to the participant by May 31 of the following year. This is because HSA contributions for the previous tax year can generally be made through the tax-filing deadline, subject to the applicable rules.

The form also reports contributions made in the subsequent year that are designated for the prior calendar year.

So don't assume that the 5498-SA is incorrect just because you already filed or received your other tax documents.

Also, don't automatically add the 5498-SA contribution amount on top of everything else without checking how your HSA contributions were made and how your tax return reports them.

The easiest way to remember the difference is:

1099-SA = money coming out of the HSA

5498-SA = money going into the HSA and information about the account

The IRS says Form 1099-SA is used to report distributions from an HSA, Archer MSA, or Medicare Advantage MSA. The distribution can be paid to the account holder or directly to a medical provider.

Form 5498-SA is different. It's used to report information about HSA, Archer MSA and Medicare Advantage MSA accounts, including contributions, certain rollovers and the account's fair market value at year-end.

So if you see both forms, that isn't necessarily a mistake. They are reporting different sides of the account activity.

One thing I'd definitely check is whether you're looking at the tax year correctly.

I made the mistake of comparing my December payroll contributions with the 5498-SA without considering that an HSA contribution made in January or April could potentially be designated as a contribution for the previous tax year.

The IRS instructions specifically explain that contributions made between January 1 and the tax-return due date (without extensions) can generally be treated as contributions for the previous tax year, subject to the applicable rules. (irs.gov)

As for 1099-SA, it reports distributions from the HSA. You generally use that information when determining the HSA distribution amounts that need to be accounted for on Form 8889.

If you used HSA funds for qualified medical expenses, the distribution can generally be excluded from income if the applicable requirements are met. If you used funds for nonqualified expenses, different tax treatment can apply.

I wouldn't just copy both forms into the return independently. They're reporting different sides of the HSA activity.

I had the same question about whether 5498-SA actually gets entered into the tax return.

From my experience, the 1099-SA is the one you really need when figuring out HSA distributions, while Form 5498-SA is primarily an informational form showing HSA contributions.

The IRS says Form 5498-SA reports contributions made to an HSA, Archer MSA or Medicare Advantage MSA, including certain contributions made for the previous tax year. (irs.gov)

For an HSA, the contribution information is relevant when completing Form 8889, Health Savings Accounts (HSAs).

Also, don't assume the amount on your 5498-SA must equal exactly what your employer deducted from your paycheck during the calendar year. Contributions made for the prior tax year can be made by the following year's tax-return due date and reported as prior-year contributions under the applicable rules.

That's what caused my mismatch.