ACA 1095-B/C IRS Filing Deadline — March 31
Tuesday, March 31, 2026
ACA employer mandate information return (Form 1095-C) IRS filing deadline — March 31, 2026.
Who must file or pay
Employers with 50+ full-time equivalent employees (ALEs) must file Form 1095-C. Health insurers file Form 1095-B. Employee copies due January 31.
What you need to know
Applicable Large Employers (50+ FTEs) must provide Form 1095-C to employees by January 31 and file with the IRS by March 31 (electronic deadline). The forms report health coverage offered and employee enrollment.
For small employers, 1095-B is filed by health insurance carriers, not the employer. However, self-insured small groups must file 1095-B on behalf of their plan.
The S-Corp shareholder health insurance deduction requires the premium to appear on the W-2 (not 1095). Confirm this treatment with your payroll provider or TaxosAgent before filing.
$310 per form for filing after the deadline (up to $3.78M for large filers).
Required forms
- →Form 1095-B
- →Form 1095-C
- →Form 1094-B/C (transmittal)
A licensed TaxosAgent professional reviews your situation before this deadline — so you maximize savings, not just compliance.
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Other dates to know
S-Corp Return Deadline — March 17
S-Corporation Form 1120-S due March 17, 2026 — shareholder K-1s must be issued by this date.
Partnership Return Deadline — March 17
Partnership Form 1065 due March 17, 2026 — K-1s to all partners by this date.
W-2 Issuance Deadline — January 31
Employers must issue W-2s to employees and file with SSA by January 31, 2026.