[ Text of section effective until March 31, 2012. Repealed by 2008, 521, Sec. 16. See 2008, 521, Sec. 44 as amended by 2010, 409, Sec. 23 and 2011, 224.]

  Section 20. The rate of interest upon pecuniary legacies or pecuniary distributions under a trust instrument, unless otherwise provided in the will or trust instrument, shall be such as the supreme judicial court may by general rules establish, and in the absence of any such rules the rate shall be four per cent per annum. Unless otherwise provided in the will or living trust instrument, interest shall be payable from the date of the expiration of the period within which creditors may bring actions against an executor or administrator as provided in section nine, or six months from the date upon which the distribution is required by the trust instrument.