Californians will likely decide this fall whether to extend the Proposition 30 income tax increases on the rich that voters approved in 2012.

A coalition of interest groups said Wednesday it’s turning in enough voter signatures to place a measure on the November ballot.

(Read an analysis of the initiative by the non-partisan Legislative Analyst's Office.)

The initiative’s backers include unions, school groups, doctors and hospitals – all of whom say their programs would suffer if the tax increases expire as scheduled in 2019.

“We know that there’ll be another downturn in the economy at some point, and we want to be ready for that,” says California Teachers Association President Eric Heins.

Business and taxpayer groups are expected to oppose the measure.

“We don’t certainly have the kind of budgetary crisis today as we did back in 2012,“ says Jon Coupal with the Howard Jarvis Taxpayers Association. “We have a budget surplus.”

He adds that Prop 30 was sold to voters as a temporary tax increase – and the proposed 12-year extension isn’t temporary.

The measure would bring in up to $11 billion a year for schools and health care programs, such as Medi-Cal.

Prop 30 also included a quarter-cent sales tax increase, but the proposed initiative would allow the sales tax hike to expire as scheduled at the end of this year.

The Prop 30 income tax increases apply to individual Californians who earn more than $250,000 a year; families earning above $500,000 a year; and heads of household earning more than $340,000 a year. Unless those increases are extended, they would expire at the end of 2018.