Updated

A proposal to increase Colorado income taxes to pay for school upgrades will appear on the November ballot after election officials determined that there were enough signatures for the petition.

But supporters of the tax increase barely got enough valid signatures even though they turned in nearly double the number that was required. The Colorado Secretary of State's office announced Wednesday that 89,820 signatures were valid. That's 3,715 more than what's needed to get on the ballot.

Supporters of the tax increased had turned in 165,710 signatures, but many were invalid.

The tax proposed would raise nearly $1 billion a year for education upgrades including expanded kindergarten and preschool and more attention for disabled students and students learning English. Voter approval of the tax is required before a new school-funding overhaul law takes effect.