[KarlInOhio]

It looks like the tax withholding is going up by 10% from the original state withholding, not jumping to 10% of the paycheck. The linked article states

"From a single taxpayer earning $51,000 a year with no dependents, the state will be grabbing an extra $17.59 each month, according to state tax officials. A married person earning $90,000 with two dependents would receive $24.87 less in monthly pay."

Still, change the W-4 so that you owe on April 15. You never want to expect a refund, doubly so with California now.

[KarlInOhio]

Here's a link to California's version of the W-4 called the DE 4. http://www.edd.ca.gov/pdf_pub_ctr/de4.pdf

Bump up the number of withholding allowances to reduce the state's take so you don't get a refund, which the state might delay paying or refuse to pay next year.