Each family support magistrate, who has completed not less than ten years of service as such magistrate, or other state service or service as an elected officer of the state, or any combination of such service, shall receive semiannual longevity payments based on such service completed as of the first day of July and the first day of January of each year as follows:

(1) A family support magistrate who has completed ten or more years but less than fifteen years of service shall receive one-quarter of three per cent of the annual salary payable under subsection (h) of section 46b-231;

(2) A family support magistrate who has completed fifteen or more years but less than twenty years of service shall receive one-half of three per cent of the annual salary payable under said subsection (h) of section 46b-231;

(3) A family support magistrate who has completed twenty or more years but less than twenty-five years of service shall receive three-quarters of three per cent of the annual salary payable under said subsection (h) of section 46b-231; and

(4) A family support magistrate who has completed twenty-five or more years of service shall receive three per cent of the annual salary payable under said subsection (h) of section 46b-231.