PITTSFIELD — Taxpayers might see a smaller tax bill than previously expected after the School Administrative District 53 board considers a revised budget at its May 7 meeting.

Superintendent Michael A. Gallagher will present a revised 2012-13 budget that lowers the local assessment from $422,945 to $285,693, according to a memo from Gallagher to the board.

“This was made possible through budget decreases, increases to additional revenues and a carry forward of undesignated fund balance,” Gallagher wrote.

Estimates of the effect on property taxes in Burnham, Detroit and Pittsfield probably will be finalized at Monday night’s meeting.

The revision increases the $10.14 million budget 2.46 percent over the current year, instead of a 2.95 increase. Directors also will vote on the proposed $48,752 adult education budget, up slightly from last year’s $47,714.

Although the state subsidy has decreased from $15,056 to $12,224, the local assessment is $416 lower because of an anticipated increase in certified nursing assistant students and a larger carryover of funds from the previous budget.

The new budget includes the addition of a third-grade teaching position, restoration of an assistant principal at both the pre-kindergarten-through-fourth-grade and middle school levels and 15 hours per week to a maintenance position; and upgrading the elementary guidance position from a two-day-per-week job to full time.

The district operates under the two-tiered approval system, with a district budget meeting at 6:30 p.m. Thursday, May 24, in the Warsaw Middle School gymnasium; and a referendum on June 12, the regular state election day.

On the same night as the budget meeting, there will be a public hearing on a proposal to authorize the board to enter into a new 10-year contract agreement with Maine Central Institute. About 315 high school students from the district attend the school.

Monday’s meeting gets under way at 7 p.m. at the Warsaw Middle School library.