Ad valorem

Key Takeaways

• Ad valorem is Latin for "according to value," so an ad valorem tax rises and falls with the value of the thing being taxed.
• Washington assessors must value property at one hundred percent of its true and fair value, and the tax bill is figured from that assessed value (RCW 84.40.030).
• Property taxes become a lien on the parcel on January 1 of the year they are levied, months before any bill arrives (RCW 84.60.020).
• A special assessment is not ad valorem, because it is charged by the benefit a local improvement gives a parcel rather than by the parcel's value.

What It Means

Ad valorem is a Latin phrase meaning "according to value." A tax charged ad valorem is calculated from the assessed value of the thing being taxed, so two owners on the same street pay different amounts when their properties are valued differently. General property tax is the ad valorem tax a real estate licensee meets most often: the county assessor sets a value for each parcel, the taxing districts set their levy rates, and the owner's bill is that value multiplied by the combined rate.

Nothing about the owner's income, the size of the mortgage, or the price paid three years ago enters the calculation directly. Only value does. That is what separates an ad valorem charge from a flat fee or from Special Assessment Taxes, which are spread by the benefit an improvement gives each lot rather than by what the lot is worth.

Because value drives the bill, an ad valorem tax moves when the market moves and when the assessor reappraises. An owner who believes the assessed value is too high can appeal it, and a successful appeal lowers the tax without any rate changing.

How It Works in Washington

Washington runs its property tax on the ad valorem model from end to end. RCW 84.40.030 requires that all property be valued at one hundred percent of its true and fair value in money and assessed on the same basis unless a law provides otherwise, so the assessor's job is a valuation job, not a rate-setting job. Rates come from the taxing districts, and RCW 84.52.050 caps the aggregate of all tax levies by the state and all taxing districts at one percent of true and fair value, subject to the exceptions the statute itself lists.

Timing matters as much as the math. Under RCW 84.60.020, taxes assessed on real property are a Lien on that property from and including the first day of January in the year they are levied, and the lien stays until the taxes are paid. That is why unpaid taxes surface in a title search before any bill has been mailed, and why taxes are handled by Proration at closing. RCW 84.56.020 makes the tax due to the county treasurer on or before April 30, and if one-half is paid by April 30, the remainder is due on or before the following October 31.

Example

Maria Ellison buys a rambler in Spokane County. The assessor values it at $480,000 for the tax year, and the combined levy rate for her tax code area is $9.20 per $1,000 of assessed value. Her ad valorem tax is $480,000 divided by 1,000, which is 480, multiplied by $9.20, for a bill of $4,416. Maria pays $2,208 by April 30 and the second half by October 31. Her neighbor Dev Patel owns the identical floor plan on a smaller lot valued at $430,000. Same rate, different value, so Dev owes $3,956 for the year. Neither bill depends on what either of them paid at closing or on the size of their loans, only on the value the county placed on each parcel.

Common Mistakes and Exam Traps

• Ad valorem means the charge follows value, not benefit. A local improvement district assessment for a new sewer line is a benefit charge and is not ad valorem, even though it prints on the same tax statement.
• The assessed value, not the sale price, is what the tax is figured on. A buyer who paid $600,000 for a home assessed at $520,000 still owes tax on $520,000 until the assessor changes the roll.
• A rate stated per $1,000 of assessed value is not a percentage. $9.20 per $1,000 equals 0.92 percent, and sliding the decimal the wrong way is the most common math miss on this topic.
• Ad valorem property taxes attach to the parcel, not to the person. A buyer who takes title while taxes are unpaid takes the lien along with the land.