Sales tax in Santa Rosa will bump up a quarter-percent on April 1 for a total 9.5 percent on all purchases of taxable goods.
The increase will add $75 in taxes to the purchase of a $30,000 automobile and will boost revenue to the city's general fund by $6 million a year for the next eight years.
City voters approved the 0.025 percent sales tax increase in November, giving Measure P a 57 percent "yes" vote.
All other sales tax rates in Sonoma County remain unchanged, the state Board of Equalization reported.
Effective April 1, Santa Rosa, Rohnert Park and Cotati sales taxes will be 9.5 percent. Sebastopol's is 9.25 percent and the other five cities and the unincorporated area are at 9 percent.
A dozen other California cities boosted their sales tax rates and 10 will have rates exceeding 10 percent. Pico Rivera and South Gate, both in Los Angeles County, will be tops at 10.75 percent.