The practical answer
Custodians must process Form 1099-SA for distributions and Form 5498-SA for contributions and fair market value. Because these flows record different transactional lifecycles, including subsequent-year contributions, mistaken distributions, and distinct rollover reporting, they do not naturally balance against each other. Reconciliation requires mapping ledger entries to specific box requirements rather than expecting net distributions to match net contributions.
For financial institutions, trustees, and custodians administering Health Savings Accounts (HSAs), Archer MSAs, and Medicare Advantage MSAs, information reporting requires maintaining two independent data flows. Preparing accurate returns means understanding that Form 1099-SA and Form 5498-SA serve distinct compliance purposes for the filing organization.
This guide explains how custodians bridge internal account ledgers to IRS reporting standards. It applies the continuous-use IRS instructions for the 2026 tax year (filed in early 2027), addressing reporting exceptions like trustee-to-trustee transfers, mistaken distributions, and December 31 fair market value (FMV) without delving into the account holder's personal tax obligations.
Establish independent ledgers for both reporting flows
Custodians cannot simply net a participant's account activity to generate tax forms. Form 1099-SA strictly reports funds leaving the account (distributions), while Form 5498-SA reports incoming funds (contributions and rollovers) and the year-end fair market value (FMV).
Because participants can make prior-year contributions in the current calendar year, and because specific transaction types bypass reporting entirely, the sum of Form 5498-SA minus Form 1099-SA will rarely equal the account's cash balance change. Custodians must establish a reconciliation workflow that treats deposits and withdrawals as separate compliance tracks, mapping each to the applicable official IRS instructions for the respective form.
Reconcile the contribution flow for Form 5498-SA
When preparing Form 5498-SA, custodians must isolate contributions based on the year they were received and the tax year they are designated for. For the 2026 tax year, filers use the December 2026 revision of Form 5498-SA.
Box 2 reports total HSA or Archer MSA contributions made in the calendar year. This box must include any contributions physically received during the calendar year, even if the participant designated those funds for the prior tax year. It also includes qualified HSA funding distributions transferred from an IRA.
Box 3 reports contributions made in the subsequent year for the calendar year (for example, contributions received between January 1 and April 15 of the following year designated for the reporting year). Rollover contributions must be completely separated from regular contributions and reported in Box 4.
Reconcile the distribution flow for Form 1099-SA
The distribution flow on Form 1099-SA requires identifying the gross amount of funds leaving the account and categorizing the nature of the withdrawal. For 2026 distributions, custodians use the April 2025 continuous-use revision of Form 1099-SA.
Box 1 captures the gross distribution. The custodian is not required to determine the taxable amount of a distribution or verify whether the funds were used for qualified medical expenses. If there are earnings on excess contributions, those earnings are reported in Box 2, but they must also be included in the Box 1 gross total. Entering Box 2 amounts without including them in Box 1 will cause systemic reporting discrepancies.
Custodians must also assign a Box 3 Distribution Code. Normal distributions to the account holder or direct payments to medical service providers take Code 1. Distributions of excess contributions take Code 2. Distinct codes apply for disability (Code 3), prohibited transactions (Code 5), and various death distributions (Codes 4 and 6).
Handle transfers and mistaken distributions
Certain ledger movements must be intentionally excluded from both Form 1099-SA and Form 5498-SA to prevent over-reporting. Trustee-to-trustee transfers from one HSA to another HSA, or from an Archer MSA to an HSA, are not reported as distributions or contributions.
Mistaken distributions present a unique workflow challenge. If funds were distributed from an HSA because of a mistake of fact due to reasonable cause, the beneficiary may repay the mistaken distribution. As the trustee or custodian, you do not have to allow beneficiaries to return a mistaken distribution. However, if the custodian does allow it, the institution may rely on the account beneficiary's statement that the distribution was a mistake.
When a mistaken distribution repayment is processed, the custodian must not treat the repayment as a contribution on Form 5498-SA. Furthermore, the original mistaken distribution must not be reported on Form 1099-SA. If the Form 1099-SA was already filed before the custodian became aware of the error and accepted the repayment, the custodian must issue a corrected return.
Worked example: Reconciling the custodian ledger
To illustrate the separation of flows, consider this fictional example of an HSA ledger for calendar year 2026. The custodian must map these raw transactions to the correct tax forms without attempting to force a net balance.
| Ledger Event | Amount | Form 5498-SA Action | Form 1099-SA Action |
|---|---|---|---|
| Current year regular deposit | $3,000 | Include in Box 2. | No action. |
| Prior year deposit made in 2026 | $1,000 | Include in Box 2. | No action. |
| HSA to HSA direct transfer in | $1,500 | Exclude from reporting. | No action. |
| Rollover check deposited | $500 | Include in Box 4. | No action. |
| Normal withdrawal by owner | $1,200 | No action. | Include in Box 1 (Code 1). |
| Repayment of mistaken withdrawal | $200 | Exclude from reporting. | Reverse prior withdrawal; exclude. |
| Dec 31 Account FMV | $5,000 | Report in Box 5. | No action. |
In this scenario, Form 5498-SA reports $4,000 in Box 2 (combining the current year and prior year deposits made in 2026) and $500 in Box 4 for the rollover. Form 1099-SA reports only $1,200 in Box 1. The direct transfer and the mistaken distribution repayment are excluded entirely from both flows.
Fair market value and zero-balance closures
Form 5498-SA serves a dual purpose: reporting contributions and reporting the account's overall value. Box 5 requires the fair market value (FMV) of the account on December 31 of the calendar year.
If a total distribution was made from the account during the year, leaving a zero balance, the reporting obligation depends on whether contributions occurred. If no contributions were made for that year and the December 31 FMV was zero, the custodian generally does not need to file Form 5498-SA or furnish a statement to the participant. However, if any reportable contributions or rollovers were made prior to the total distribution, the form must still be filed to report those incoming amounts, with a zero entered in Box 5.
Custodian processing for HSA data flows
Read the workflow as text
- Extract account ledger. Pull all inbound deposits, outbound payments, and the December 31 FMV.
- Filter non-reportable items. Remove direct trustee-to-trustee transfers and accepted mistaken distribution repayments.
- Route outbound flow. Map gross withdrawals to 1099-SA Box 1 and assign the correct Box 3 distribution code.
- Route inbound flow. Map regular receipts to 5498-SA Box 2 or 3, isolate rollovers to Box 4, and report Dec 31 FMV in Box 5.
Put this guide to work
Custodian HSA Transaction Mapping Checklist
Save the editable text worksheet and use it with your own records. Keep completed copies in your secure working files.
Download the worksheet TXTCommon questions
Are trustee-to-trustee transfers reported as rollovers on Form 5498-SA?
No. Direct trustee-to-trustee transfers between HSAs or from an Archer MSA to an HSA are not reported as contributions or rollovers on Form 5498-SA, nor are they reported as distributions on Form 1099-SA.
If we accept a mistaken distribution repayment, how do we report it?
Do not treat the repayment as a contribution on Form 5498-SA. Additionally, the original mistaken distribution must not be reported on Form 1099-SA. If the 1099-SA was already filed, you must file a corrected return with the IRS and furnish a corrected statement to the account holder.
Must we file Form 5498-SA if an account was closed with a zero balance?
If a total distribution was made during the year resulting in a zero FMV on December 31, and no reportable contributions or rollovers were made for that year, you generally do not need to file Form 5498-SA.
What revisions of the forms should custodians use for 2026 reporting?
For 2026 information filed and furnished in early 2027, custodians must use the continuous-use April 2025 revision of Form 1099-SA and the December 2026 revision of Form 5498-SA.
Should W-2 W-4 W-9 W-8 reporting rules apply to HSA reconciliation?
No. Custodians must reconcile their internal account ledgers against the specific Form 1099-SA and 5498-SA instructions, which dictate separate handling for HSA contributions, distributions, and fair market value.
Official sources and scope
Sources checked September 5, 2026. Use the edition for the tax year and filing method you are working with; later instructions may change thresholds, fields, or procedures.
- Instructions for Forms 1099-SA and 5498-SA, revision December 2026
Dictates use of specific continuous-use revisions for 2026, handling of trustee-to-trustee transfers, mistaken distributions, and exact box-by-box mapping for custodians.
