CA state income tax withholding

In CA, for an employee who pays into a 401k plan, is SDI based on earnings before the 401k reduction or after?

QuickBooks Help
From the article: A 401k deduction reduces wages for federal income tax and most state income tax withholding.

It impacts very few other taxes. When you set up a 401k item you can see the default tax-ability on the tax slide. CA-Disability Employee is not selected, which means the deduction does not impact the tax. If you select that tax, you’ve given a warning, stating it’s probably wrong. Which it is.
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