Yarmouth’s school budget referendum on Tuesday will ask voters to approve a 1.8 percent spending increase in 2014-15, but the town’s overall tax rate is expected to decrease 1.5 percent.

The proposed $21.2 million school budget is $374,000 higher than the current $20.8 million spending plan, according to budget documents. The town’s total proposed budget, including municipal and county spending, is set to increase $840,510, or 2.6 percent, from $32.7 million to $33.6 million.

The tax rate, however, is expected to decrease 33 cents, or 1.5 percent, from $22 to $21.67 per $1,000 of assessed property value.

The spending increase will be more than offset by an additional $570,000 in state education funding and new sewer fees.

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