Oregon Revised Statutes Probate Law § 116.143

(1) As used in this section, “discount rate” means the auction average rate on 91-day United States Treasury bills, as established by the most recent auction of these Treasury bills and as reported by the United States Department of the Treasury, Bureau of the Public Debt. The discount rate shall be determined, with reference to the most recent auction date, before May 15 and before November 15 of each year.

(2) General pecuniary devises not entitled to a share of income under ORS 116.007 (2) bear interest payable from the residuary estate at the discount rate for a period beginning one year after the first appointment of a personal representative until payment, unless a contrary intent is evidenced in the will or unless otherwise ordered by the court.