Continuance of tax until reduced -- Expiration date

School taxes imposed under KRS 160.593 to 160.597, 160.601 to 160.617, and 160.635 to 160.648 shall remain in full force and effect from year to year until the local board of education reduces the rate in effect; however, at the time the tax is first levied the board may set a date on which the tax shall expire.