Oregon Revised Statutes Probate Law § 112.135

(1)(a) If a person dies intestate as to all or part of the estate of the person, property that the person gives during the lifetime of the person to an heir is treated as an advancement against the heir's share of the estate if declared in writing by the decedent or acknowledged in writing by the heir to be an advancement.

(b) For purposes of applying the gift against the heir's share of the intestate estate, the property advanced must be valued as of the time the heir came into possession or enjoyment of the property or as of the time of death of the decedent, whichever occurs first, unless otherwise directed in the decedent's writing.

(2)(a) Except as provided in ORS 112.385, property that a testator gives during the testator's lifetime to a devisee is treated as an advancement of the devisee's share in whole or in part if:

(b) For purposes of applying the gift against the devisee's share of the testate estate, the property advanced must be valued as of the time the devisee came into possession or enjoyment of the property or as of the time of the testator's death, whichever occurs first, unless otherwise directed in the testator's will or a writing described in paragraph (a)(B) of this subsection.

(3)(a) Property not subject to probate administration, the transfer of which is intended by the decedent to take effect on death, is treated as an advancement against the heir's share of the estate or the devisee's devise under the will if declared in writing by the decedent, or acknowledged in writing by the heir or devisee, to be an advancement. Examples of transfers under this subsection include but are not limited to beneficiary designation, right of survivorship and transfer on death deed or transfer on death designation.

(b) The property transferred under this subsection must be valued as of the time of the decedent's death, unless otherwise directed in the testator's will or in a writing by the decedent.