Who must register
California sellers
Digital product sellers in California who are not already registered must register for a seller's permit, file sales and use tax returns, and report and pay tax on retail sales of digital products. (L-1036)
Out-of-state sellers
Out-of-state sellers "engaged in business in this state" as defined in Revenue and Taxation Code §6203 must register for a Certificate of Registration–Use Tax, collect and report use tax on retail sales of digital products to California consumers, and pay it to CDTFA.
Whether you are "engaged in business" depends on §6203 and your facts (for example, physical presence or sales volume into California). Review this with a CPA. (Confirm with a tax professional.)
Already registered?
If you already hold a seller's permit, CDTFA's guidance doesn't describe a separate permit for digital products. Plan to report taxable digital product sales on your returns starting in 2027. (Confirm with a tax professional.)