The New Fairfield Board of Finance has signed off on a $58.2 million budget for the coming fiscal year.  The plan includes a tax increase of 2.98 percent.  If approved in a referendum, the mill rate would increase to about 31.49.  The school budget would be $45.3 million and the town budget would be $12.9 million for the coming year.  The Finance Board trimmed $224,000 from the proposed municipal budget and $1 million from the plan presented by the Board of Education.  The leading factor in the tax rate increase is debt service coming up for the two new schools.  Just .17 of the nearly 3 percent increase is to cover payroll, non-payroll, medical, and capital and non-recurring increases.