State Senator Rollie Heath, D-Boulder, right, helps Colorado Commits to Kids volunteer Laurel Javors unload boxes of petitions signed by people who support placing a school-finance measure on the November ballot, at the offices of the Colorado Secretary of State, in Denver, Monday Aug. 5, 2013. Backers of the Colorado Commits to Kids initiative on Monday turned in signatures from more than 160,000 people. (AP Photo/Brennan Linsley)

DENVER | Smiling schoolchildren and a bright school bus hauled boxes of petitions to Denver on Monday as activists pushed for the largest voter-approved permanent tax hike in state history to overhaul education funding.

The petitions call for placing a tax measure on the November ballot asking voters to hike income taxes nearly $1 billion a year to pay for school upgrades and new accountability efforts.

State Senator Rollie Heath, D-Boulder, right, helps Colorado Commits to Kids volunteer Laurel Javors unload boxes of petitions signed by people who support placing a school-finance measure on the November ballot, at the offices of the Colorado Secretary of State, in Denver, Monday Aug. 5, 2013. Backers of the Colorado Commits to Kids initiative on Monday turned in signatures from more than 160,000 people. (AP Photo/Brennan Linsley)
State Senator Rollie Heath, D-Boulder, right, helps Colorado Commits to Kids volunteer Laurel Javors unload boxes of petitions signed by people who support placing a school-finance measure on the November ballot, at the offices of the Colorado Secretary of State, in Denver, Monday Aug. 5, 2013. Backers of the Colorado Commits to Kids initiative on Monday turned in signatures from more than 160,000 people. (AP Photo/Brennan Linsley)

Groups supporting the school finance overhaul said they delivered more than 160,000 signatures — nearly twice the required number to get the measure on ballots.

State elections officials have 30 days to verify the signatures and decide if the school tax goes to voters.

If passed, the additional income tax money would be spent on statewide, full-day kindergarten, expanded access to free preschool and other upgrades.

The taxes would also pay for what supporters call the nation’s first tracker software allowing voters to see how their local district spends every dollar on teacher salaries, pensions, classroom instruction, tutoring and other expenses.

State Sen. Michael Johnston, a Denver Democrat who sponsored the funding overhaul, called the overhaul a bold plan to bring “efficiency metrics” to education.

“They’ll be able to track every day where every single taxpayer dollar goes into the system,” Johnston said.

To pay for the changes, Colorado’s current income tax rate of 4.63 percent would be raised to 5 percent on earnings up to $75,000 a year and 5.9 percent for earnings above that threshold.

A person with a taxable income of $45,000 would pay an additional $166.50 a year. Someone with a taxable income of $100,000 a year would pay an extra $595 annually.

Opponents say the tax hike is too big and the overhaul doesn’t make the right kinds of changes to improve schools. Some critics wanted to see more money for charter schools, while others complain that it doesn’t contain adequate safeguards that the extra money would be spent only on the changes supporters tout.

Critics include Republicans in the Legislature, all of whom voted against it, and Republican State Treasurer Walker Stapleton.

“This scheme with a billion-dollar tax hike doesn’t provide for the real reforms that would get the quality education Colorado children deserve,” said Kelly Maher, head of Compass Colorado, a conservative group that launched an opposition campaign on Monday.

Ami Prichard, a social studies teacher from Littleton who gathered signatures with other members of the state’s largest teachers’ union, brought her children to see the petitions dropped off at the Secretary of State’s office and said the extra money is sorely needed.

Prichard gathered signatures outside concerts at Red Rocks Amphitheater and visited parks to promote the funding overhaul.

“Almost to a person, everybody agrees that the funding in education is a problem,” Prichard said. “Some people don’t want to pay taxes to fix it, but everybody seems to know we have to do something.”

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Kristen Wyatt can be reached at https://www.twitter.com/APkristenwyatt

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Online:

School tax campaign: https://coloradocommitstokids.com