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P.O. Box 87551
Vancouver, WA 98687
phone: (858) 454-0121
e-mail: support@howardsoft.com
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Downloads for 2026 Editions of California Supplement
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Release 2026.01

Initial installation for the year must be from the first California Supplement (540) program we provide you for the current tax season. Once you have completed the installation, you can use these on-line updates for subsequent changes throughout the tax season.

TIP: Before executing these downloads, exit Tax Preparer by closing the Tax Preparer Control Panel. If you do not, you will encounter an error message indicating that HSPrnTax.EXE is being used by another process, and the update will not be completed.

The downloads on this page are only for California Supplement for Form 540 returns. Downloads for Tax Preparer for Form 1040 returns are found on the Main Downloads page. Downloads for the Partnership Edition for Form 1065 returns are found on the Partnership Downloads page.

California Supplement Downloads


The 2026 Edition of the California Supplement 540 software is not yet released.