Most California voters support Proposition 55, a November ballot measure that would extend higher temporary income taxes on people earning more than $250,000 a year, according to a new poll released today by the Institute of Governmental Studies at UC Berkeley.

The survey of registered voters also found extremely strong bipartisan support for Proposition 56, which would increase the cigarette tax by $2 a pack.

The poll used online English-language questionnaires to survey 3,020 respondents from June 29 to July 18. All respondents were registered California voters, and the responses were weighted to reflect the statewide distribution of the California population by gender, race/ethnicity, education and age.

Asked about Prop. 55, which will be on the Nov. 8 ballot, 65.3 percent of respondents Favored the measure, while only 34.7 percent opposed it. Democrats were overwhelmingly in support, 78 percent to 22 percent, while Republicans opposed the measure 53.8 percent to 46.2 percent.

Voters approved higher temporary income tax rates for the wealthy when they passed Prop. 30 in 2012. That measure also raised sales taxes for all, but the higher rates for both the income and sales taxes are scheduled to expire by the end of 2018. Proposition 55 would extend the higher income tax rates, but not the higher sales taxes.

To test voters’ reaction to various arguments, the survey included three versions of a question on Prop. 55. One form of the question simply described the proposed extension. The second form noted that the ballot measure would extend the higher taxes “even though the state has a healthy budget surplus.” The third form noted that the extension was being proposed “because of the need for funding of state programs.”

All three versions of the question produced majority support for extending the taxes. Support was lowest (62.7 percent) when people were told about the surplus, and higher when they were simply asked the basic question (68.5 percent), or when the need for programmatic funding was mentioned (64.8 percent).

Support for the tax extension included a majority of respondents in every ethnic, age and educational category. Even among relatively high-income earners, there was support for the extension. Support was highest (69.9 percent) among respondents with a household income of less than $40,000 per year, but even among those with incomes of more than $100,000 a year, 58.7 percent supported retaining the higher rates.

Cigarette tax Prop. 56 would raise the cigarette tax by $2 per pack from its current rate of 87 cents per pack. That measure was supported by 74.3 percent of respondents, including strong majorities in both parties and among independents. All demographic groups supported the increase, but there

were clear differences along educational lines, as support increased steadily with a higher level of education, from 58.1 percent from those with less than a high school diploma to 85.6 percent for those with a graduate degree.

General level of taxation

A more generic taxation question asked respondents whether their level of state and federal incomes taxes is “too high, about right or too low.” Among Democrats, 50.8 percent answered “too high,” while 46 percent said “about right.” This contrasted with Republicans, among whom 73.4 percent said “too high” and only 25 percent said “about right.” Very few respondents in either party thought they paid too little in income tax.

Although California’s income tax is extremely progressive, collecting a large share of the revenue from high-income earners, objections to the overall level of taxation did not rise dramatically with income. Among those earning less than $40,000 a year, 54.6 percent of respondents said their taxes are “too high.” Among those earning more than $100,000, 62.2 percent answered “too high.” The belief that taxes are too high was most common among those

with a college degree or less education, and was lower among those with a graduate degree.

For full results of the poll, please go to the IGS website at igs.berkeley.edu.