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HSA Contribution Deadline for 2026: April 15, 2027

Short answer: Publication 969 (2025 edition) says you can make contributions to your HSA for 2025 through April 15, 2026. By the same rule, contributions for 2026 are expected to be allowed through April 15, 2027 (a Thursday). We haven't seen the 2026 edition of the publication, so treat that date as expected.

Details from Pub. 969 (2025 edition)

• If you fail to be an eligible individual during the year, you can still contribute through the deadline for the months you were eligible.
• Employer contributions: your employer can contribute from January 1 through April 15 of the next year, allocated to the prior year; the employer must notify you and the trustee that the contribution is for the prior year, and it's reported on the next year's W-2.
• Report all contributions on Form 8889, including those made January 1 to April 15 that you designate for the prior year.
• Contributions are limited to the annual limit: for 2026, $4,400 self-only and $8,750 family; for 2027, $4,500 and $9,000 (see limits).

Practical tip (not advice)

When you contribute between January 1 and April 15, tell the HSA trustee which tax year the contribution is for. We did not verify how each trustee handles this.

FAQ

Does the last-month rule matter? It affects your limit if you became eligible late in the year; see last-month rule.

What if I over-contribute? See the excess contribution deadline.

What we could not verify

• The 2026 edition of Pub. 969 and the 2026 Form 8889 instructions.
• Trustee procedures for year designation.

Sources (official)

• IRS, Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans — https://www.irs.gov/publications/p969 (read in part October 17, 2026; the 2026 edition was not yet posted)

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Not tax/financial advice. Examples use made-up figures and have not been reviewed by a tax professional. See the disclosure.