California Gov. Gavin Newsom said the state's current treatment of prewritten software is unfair to those who are already paying sales taxes. Jeff Chiu/AP California Gov. Gavin Newsom wants to ensure that the state's sale tax applies to digital software. Newsom said it isn't fair that someone has to pay sales tax for an in-person purchase but not for a download. If passed, the tax could be another blow to already reeling software and SaaS companies. California could deliver a big blow to already reeling SaaS and software companies. On Thursday, Gov. Gavin Newsom proposed expanding the state sales tax to ensure it covers digital prewritten software. Newsom, whose term ends in January, said he had been "slow" to recognize that consumers were paying a 7.25% sales tax when they buy software in a store but not when they buy it online. "As someone who lives near a Best Buy, I'm at Best Buy often," Newsom told reporters during a news conference. "And I'm paying sales tax on a lot of this prewritten software.…