Wash. Admin. Code § 458-57-155
(2) Definitions. The following terms and definitions are applicable throughout chapter 458-57 WAC:
(d) "Farming purposes" means:
(e) "Member of the family" means, with respect to any individual, only:
(iv) The spouse of any lineal descendant described in (e)(iii) of this subsection.
A legally adopted child of an individual shall be treated as the child of such individual by blood.
(f) "Qualified heir" means, with respect to any property, a member of the decedent's family who acquired property, or to whom property passed, from the decedent.
When farm property is held in a trust, only the individuals with a present-beneficiary interest in the trust may qualify as a "qualified heir" or "member of decedent's family" under this rule.
(h) (i) "Qualified real property" means real property which was acquired from or passed from the decedent to a qualified heir of the decedent and which, on the date of the decedent's death, was being used for a qualified use by the decedent or a member of the decedent's family, but only if:
(A) Fifty percent or more of the adjusted value of the gross estate consists of the adjusted value of real or personal property which:
(C) During the eight-year period ending on the date of the decedent's death there have been periods aggregating five years or more during which:
(ii) For the purposes of this subsection, the term "adjusted value" means:
(j) "Qualified woodland" means any real property which:
(k) "Timber operations" means:
(3) Farm deduction—Qualification criteria.
(b) There are several criteria that must be met before the deduction can be taken:
(4) What does "acquired from the decedent" mean? Property shall be considered to have been acquired from or to have passed from the decedent if:
(7) Tenant farmers. If the following criteria are met, the estate of a tenant farmer may deduct from the Washington taxable estate the value of the agricultural personal property:
(8) Examples.
(a) The decedent died May 18, 2020, with an adjusted gross estate valued at $4,000,000. The decedent was a dry land wheat farmer and owned 2,000 acres of land valued at $2,000,000 ($1,000 per acre) and $500,000 in farm equipment. The decedent was a U.S. citizen, owned and worked the acreage for the last 20 years, and left the farm to his son, a qualified heir. The value of the farm acreage and equipment exceeds the required 50% or more of the adjusted gross estate ($2,000,000 + $500,000 ˃ $4,000,000 x 50%). The value of the 2,000 acres and the farm equipment can be deducted from the decedent's federal taxable estate. In this example, estate tax is not due. The calculations are shown below:
| Federal taxable estate | $4,000,000 |
| Less $2,500,000 farm deduction | - $2,500,000 |
| Less $1,500,000 statutory exemption | - $1,500,000 |
| Washington taxable estate | $0 |
Although Washington estate tax is not due, the estate is still required to file a Washington estate tax return along with a photocopy of the filed and signed federal return and all supporting documentation.
(b) The decedent died August 28, 2020, with an adjusted gross estate valued at $5,000,000. The decedent was a hay farmer and owned 600 acres of land valued at $1,800,000 ($3,000 per acre) and $500,000 in farm equipment. The decedent was a U.S. citizen, owned and worked the acreage for the last 20 years, and left the farm to his son, a qualified heir. The value of the farm acreage and equipment did not meet the required 50% or more of the adjusted gross estate, therefore, the estate cannot deduct the value of the farm and farm equipment ($1,800,000 + $500,000 < $5,000,000 x 50%). Here are the calculations:
| Federal taxable estate | $4,000,000 |
| Less $1,500,000 statutory exemption | - $1,500,000 |
| Washington taxable estate | $3,500,000 |
Based on the tax table, the estate owes $470,000 in Washington estate tax.
(c) The decedent died May 23, 2020, with an adjusted gross estate valued at $1,600,000. The decedent was a tenant hay farmer that owned $400,000 of hay in storage that had been harvested but not sold and $800,000 in farm equipment. The decedent was a U.S. citizen, used the farm equipment in a qualified use for the last six years, and left the equipment to his son-in-law, a qualified heir. The value of the farm equipment met the required 50% or more of the adjusted gross estate so it can be deducted from the decedent's federal taxable estate ($800,000 = $1,600,000 x 50%). In this example no estate tax is due. The calculations are shown below:
| Federal taxable estate | $1,600,000 |
| Less $800,000 farm deduction | - $800,000 |
| Less $1,500,000 statutory exemption | - $1,500,000 |
| Washington taxable estate | $0 |
Although Washington estate tax is not due, the estate is still required to file a Washington estate tax return along with a photocopy of the filed and signed federal return and all supporting documentation.
(d) The decedent died April 7, 2021, with an adjusted gross estate valued at $2,500,000. The decedent owned 100 acres of timberland valued at $100,000 ($1,000 per acre), timber valued at $800,000 ($80,000 per acre), 200 acres of pasture land valued at $500,000 ($2,500 per acre) and $50,000 in farm equipment. The decedent was a U.S. citizen, owned and worked the acreage for the last 10 years, and left the timber and farm land to his daughter, a qualified heir. The value of the timberland and farm acreage and equipment exceeded the required 50% or more of the adjusted gross estate therefore the estate can deduct the value of the timber and farm land and farm equipment ($100,000 + $800,000 + $500,000 + $50,000 ˃ $2,500,000 x 50%). The calculations are shown below:
| Federal taxable estate | $2,500,000 |
| Less $1,450,000 farm deduction | - $1,450,000 |
| Less $2,000,000 statutory exemption | - $2,000,000 |
| Washington taxable estate | $0 |
Although Washington estate tax is not due, the estate is still required to file a Washington estate tax return along with a photocopy of the filed and signed federal return and all supporting documentation.
[Statutory Authority: RCW 82.01.060 and 82.32.300. WSR 26-01-184, s 458-57-155, filed 12/23/25, effective 1/23/26. Statutory Authority: RCW 83.100.047 and 83.100.200. WSR 06-07-051, § 458-57-155, filed 3/9/06, effective 4/9/06.]