Oklahoma State Question 847: what a 4% valuation cap means

On November 3, 2026, Oklahoma voters will decide Oklahoma State Question 847, a proposed constitutional amendment that would lower the annual cap on how fast the taxable value of real property can grow. For most commercial property, the cap would drop from 5% a year to 4%. For homesteads and agricultural land, it would drop from 3% to 1.75%.

It's a proposal, not law. Nothing changes unless voters approve it, and even then the Oklahoma Tax Commission's 2026 legislative summary says the lower caps would begin with tax year 2027.

What it would actually mean depends on whether you're holding, building, or buying. We'll walk through four fact patterns below. The mechanics come first, because the cap is more subtle than the ballot shorthand suggests.

How the current cap works

Article X, Section 8B of the Oklahoma Constitution limits how much the fair cash value of locally assessed real property can rise in a single tax year. Fair cash value is the assessor's estimate of what the property would bring on the market; it's the starting point for the assessment ratio and the local millage that together produce your bill.

Under the current text, that value can't increase by more than 5% in any taxable year. For a homestead or agricultural land, the limit is 3%.

Two exceptions matter to almost every business owner. The cap doesn't apply in a year when title to the property is transferred or conveyed, and it doesn't apply to improvements made to the property. A transferred parcel is assessed at full fair cash value that year, and an improvement is valued at fair cash value and added on top of the existing figure.

The cap also doesn't reach personal property or property assessed by the State Board of Equalization. Equipment and inventory reported on the business personal property rendition sit outside it entirely.

The rules the Tax Commission layers on top

County assessors follow the Tax Commission's ad valorem rules at OAC 710:10-1-3, which fill in the details. A few of those details decide outcomes in practice.

Start with accumulation, or rather the lack of it. Each year the assessor compares the property's fair cash value to its limited value. If the market jumped 15% in one year, the cap holds the taxable value to a 5% rise that year, but the assessor can raise it again the next year, and the year after, until the limited value catches up with the market.

Protest rights survive the cap. If you can show the fair cash value is actually below the limited value, the assessor may lower the property to that figure, and the cap then runs from the new base.

Normal maintenance doesn't count as an improvement. The rule gives roof repair or installation as an example of maintenance that generally doesn't affect the limited value. Restoration after fire or storm damage is disregarded for cap purposes unless the rebuild adds square footage.

Hold those rules in mind. SQ 847 would change the percentages; nothing in the Tax Commission's summary suggests it would change the exceptions.

What Oklahoma State Question 847 would change

The Tax Commission's 2026 Tax Legislation Summary describes Senate Joint Resolution 39, the measure behind SQ 847, as proposing to reduce the annual limitation on increases in fair cash value of locally assessed real property beginning in tax year 2027. Homestead and agricultural property would move from 3% to 1.75%. Other locally assessed real property would move from 5% to 4%.

Beyond the percentages, the resolution adds a graduated limitation on value growth for certain senior homesteads, keyed to county median income. That piece sits alongside the existing senior valuation freeze in Section 8C, which already holds the value of a qualifying owner-occupant's homestead at the level set in the first year the owner met the age and income tests.

Again: proposed. The State Election Board lists SQ 847 as Legislative Referendum 381 on the November 3, 2026 ballot, alongside SQ 845. If voters reject it, the 5% and 3% caps stay exactly where they are.

What if SQ 847 passes? Four fact patterns

The honest answer is that the amendment helps owners who hold and does little or nothing for owners who are about to buy or sell. Here's how that plays out.

1. The owner-occupied commercial building

Say a company has owned its warehouse since 2019 and plans to keep it. The parcel is locally assessed, there have been no title changes, and the only work has been a roof replacement and routine repairs.

This is the owner the proposal is built for. If the county's market data says values are climbing faster than the cap, the limited value would rise at most 4% a year instead of 5% beginning in tax year 2027. Over a long hold, a one-point difference compounds into a slower climb in taxable value, though the bill itself still depends on the assessment ratio and the local millage, neither of which the question touches.

The non-accumulation rule cuts both ways here. A lower cap means the limited value lags the market by more each year in a rising market, and that gap doesn't disappear. It waits for a transfer or an improvement year to close.

That roof replacement matters too. Under the Tax Commission's rule, normal maintenance generally doesn't affect the limited value, so a roof shouldn't reset anything. A new loading dock or an addition would.

2. The rental development

Now take a developer who finished a 40-unit apartment complex and intends to hold it for several years before refinancing or selling.

Two things are happening at once. A separate enacted statute, Senate Bill 2018, requires cost-approach valuation for residential rental developments of at least 20 units for two years after completion of construction, or until the property is conveyed to an unrelated third-party bona fide purchaser, whichever comes first. Developments receiving the federal low-income housing tax credit are excluded. That statute is law, effective November 1, 2026, regardless of how SQ 847 turns out.

Cost approach means the assessor values the property by what it cost to build rather than by the income it produces or what comparable properties sold for. For a new development that can land higher or lower than an income approach, depending on rents and construction costs, and the two-year window ends on its own.

Once the property is past the construction year and on the rolls, the Section 8B cap governs year-over-year growth. If SQ 847 passes, that growth is held to 4% rather than 5%. A developer who holds past the cost-approach window would feel the cap's effect in the later years of the hold, not the early ones.

Here's the wrinkle we see most often with new construction: the valuation that matters most is the first full-year assessment after completion, because every later year's cap runs from that base. The protest window on that first notice is where the leverage sits. A lower cap, if adopted, makes a well-supported first-year number more valuable, not less. Our piece on protesting a commercial assessment in Oklahoma covers how that process runs.

3. The buyer closing in 2027

Suppose a company is under contract to buy an office building and will close in early 2027.

The cap does nothing for this buyer at closing. Section 8B says the limitation doesn't apply in a year when title is transferred, and the Tax Commission's rule adds that a sale during a calendar year is valued for the following tax year at fair cash value. The buyer inherits the full market number, whatever the seller's limited value was.

That's the government-side logic of the cap, and it deserves to be stated plainly. The cap is a hold-period benefit, not a property benefit. The seller's years of lagging assessments end at the closing table, and the county recaptures the gap in one step. Viewed from the county's side, that reset is what keeps a long-held parcel's taxable value from drifting permanently below market.

For a buyer, the practical question is whether the seller's current tax bill tells you anything about your own. Often it doesn't. If the seller has held for a decade in a rising market, the limited value could sit well below what the assessor will put on the roll after the sale, and a buyer who underwrites on the seller's bill can be surprised by the first post-closing notice.

Entity structuring sometimes comes up here, since a change in who holds title is what triggers the reset. We've written separately about entity and title decisions when buying commercial property. The cap is one of several reasons the question of which entity takes title deserves attention before the contract is signed rather than after.

If SQ 847 passes, this buyer benefits only in the years after the reset, as the lower cap governs growth from the new base. The reset itself is unaffected.

4. The owner adding an improvement

Finally, consider an owner who has held a retail building for years and is about to build a 5,000-square-foot addition.

Under the Tax Commission's rule, the improvement is valued as improvements normally are and added to the property's limited value as it stood before construction. The existing building keeps its capped value; the addition comes on at fair cash value. The combined figure then becomes the new limited value, and the cap applies to it going forward as long as title doesn't change.

This is kinder to the owner than a full reset, which is what a sale would cause. Only the new value enters at market.

A lower cap would make the existing building's value grow more slowly after the addition, the same hold benefit as in the first fact pattern. The addition itself enters at whatever the assessor says it's worth. Owners sometimes argue about what counts as an improvement versus maintenance, and the rule's examples help: roof repair or installation generally doesn't trigger anything, while room additions, added square footage, garages and outbuildings do.

Honest counter-considerations

We'd be doing readers a disservice to present SQ 847 as pure upside for property owners.

Local governments and school districts rely on ad valorem revenue. A lower cap slows the growth of the taxable base in a rising market, and that is a cost on the public side of the ledger. We're not going to put a number on it because none of the primary sources we reviewed states one, and you should be skeptical of anyone who does without showing their work.

The cap also creates unevenness between neighbors. Two identical buildings on the same street can carry very different taxable values if one changed hands last year and the other has been held for fifteen. A lower cap widens that spread over time. Whether that's fair is a policy question voters will answer; from a planning standpoint, it means a long-held property's low taxable value is an asset that transfers poorly.

And the cap does not reduce fair cash value. It limits how fast the taxable value climbs toward it. An owner who protests on the ground that the assessor's fair cash value is too high is fighting a different battle than the cap, and winning that fight resets the base downward in a way the cap never can.

Two enacted changes that arrive before the vote

Whatever happens on November 3, two statutes from the same legislative session are already law and take effect November 1, 2026.

Senate Bill 1579 requires that a county assessor's notice of a valuation increase include a prescribed taxpayer bill of rights. If you receive an increase notice next year, expect that language with it. The notice is the document that starts your protest clock, so read it the day it arrives.

The second statute, Senate Bill 2018, is the cost-approach rule for rental developments of 20 or more units described above. Developers and their lenders should factor the two-year cost-approach window into pro formas for anything completing after that date.

A separate proposed amendment, House Joint Resolution 1087 (designated SQ 844), would let the Legislature set in statute the levels and methods for reimbursing local jurisdictions for the five-year manufacturing ad valorem exemption. The Election Board page we reviewed listed only SQ 845 and SQ 847 for November 3, so we'll leave that one for another day.

How we'd think about it before the vote

Is there anything an owner should do before November 3? Not much, and that's the point. The cap's percentages are set by the Constitution, so no owner can opt into or out of them. The decisions that matter are the ones the cap interacts with: when to transfer title, whether a planned project is maintenance or an improvement, which entity holds the property, and how hard to push on the first-year assessment after a purchase or a build.

Those are structure questions, and in our experience they tend to surface in the same conversation as the tax question. A buyer negotiating a purchase price hasn't finished the analysis until the post-closing assessment is in the model.

If your company is buying or improving Oklahoma real property and the assessment side of the decision hasn't been worked through, we're glad to talk it over. Reach our practice through the contact page or our Oklahoma City office. A conversation early is almost always cheaper than a problem later.

This article is general information about Oklahoma, Texas, and federal law, not legal advice, and it does not create an attorney-client relationship. Facts matter; talk to a lawyer about yours.