Oklahoma aircraft excise tax: anatomy of Form 13-34

A closely held company buys an airplane for about the same reasons it buys a truck: the owner needs to get somewhere, and the business can carry the cost. The paperwork is different. In Oklahoma, the purchase triggers an Oklahoma aircraft excise tax, a state registration, and a short one-page form that quietly decides both: Form 13-34, the Application for Registration of Aircraft and Report of Excise Tax.

We like to take documents like this apart line by line, because every blank corresponds to a decision the buyer has already made, sometimes without knowing it. This article walks Form 13-34 top to bottom in the order the questions actually arrive.

Step zero: the FAA comes first

Service Oklahoma's aircraft page lists federal registration as the first step, before anything happens at the state level. The form itself asks for the FAA number and the serial number, so a buyer cannot complete it until the federal side is done or at least underway.

That sequence matters because the Oklahoma clock does not wait for the federal paperwork. The excise tax delinquent date runs from the date the aircraft was acquired, not from the date the FAA issues anything.

According to Service Oklahoma, "As of July 1, 2024, Oklahomans must begin registering their private aircraft with Service Oklahoma." The same page says that "Commercially owned aircraft are not required to be registered with Service Oklahoma," but it does not define what commercially owned means, so a company that uses its plane in the business should not assume it falls on the commercial side without checking.

The owner of record and the identification number

The form's identification block asks for the owner and for a federal employer identification number or Social Security number. That single blank is the first structural decision. Is the plane going into the operating company, into the owner's name, or into a separate LLC formed just to hold it?

We see all three. Each has consequences well outside the excise tax, from liability isolation to how the aircraft is treated when the business is sold, and the choice should be made on those grounds. But the form forces the choice before closing, and that is a useful discipline.

Storage location is the other identification item: the airport and the county. That is how the state ties an aircraft to Oklahoma, and it is the kind of fact that gets reused in other contexts later.

Purchase price or fair market value

The next blank reads "Purchase Price or Fair Market Value (Attach documentation)." This is the base on which the entire excise tax is computed, so it deserves more care than most buyers give it.

When there is an arm's-length sale, the number is the purchase price, and the documentation is the bill of sale. When there is not a true purchase price, the form falls back to fair market value. Gifts, transfers between related parties, and contributions of an aircraft into an entity are the common situations where a buyer discovers that "we paid nothing" is not the same as "the value is zero."

What documentation means

The form does not spell out what counts as documentation. In our experience the state wants something that supports the number written in the blank, and where fair market value is being used, a defensible basis for that value. The weaker the paper, the more likely the number is questioned later.

The Oklahoma aircraft excise tax itself

Form 13-34 states the rule plainly: "An excise tax of three and one-fourth (3 1/4%) of the purchase price is levied on each aircraft." Service Oklahoma's page adds the timing: "The excise tax is due at the time of the transfer of legal ownership or first registration in Oklahoma."

Two things in that sentence catch buyers. The tax attaches at the transfer of legal ownership, which is the closing, not the first flight. And the "or first registration in Oklahoma" language means an aircraft bought elsewhere and later brought into the state can face the tax when first registered here, subject to the out-of-state credit discussed under exemptions.

Sales tax on an aircraft purchase is a separate question. We have not seen a primary source in this review that describes how Oklahoma sales tax interacts with the excise tax, so we will not characterize it here beyond noting that the Oklahoma Tax Commission's 2026 legislation summary flags changes to aircraft-related sales tax exemptions taking effect in 2027, discussed at the end.

The 21-day delinquent date

Right next to the acquisition date, the form says: "Delinquent date is the twenty-first day after this date." That is the whole grace period, and it runs from acquisition, not from the FAA registration and not from when the accountant gets around to it.

In our practice this is the line that generates the most avoidable cost. An aircraft closing involves escrow, inspections, and a federal filing, and the Oklahoma form tends to be the last thing anyone thinks about. By the time it surfaces, the twenty-one days are often gone.

Interest and penalty

The form lists the consequences on its face. "Interest - 1 1/4% per month on tax from delinquent date." And: "Penalty - 10% of tax if not paid within 30 days from delinquent date."

Interest runs from the delinquent date. The penalty attaches if the tax is still unpaid thirty days after that date. On a seven-figure purchase price, the excise tax is a meaningful number, and the penalty is a tenth of it, which is why we treat the state filing as a closing deliverable rather than a post-closing cleanup item.

Exemptions: the part the form does not explain

Form 13-34, as published, does not contain an exemption checklist. The exemptions live in the statute, and the best public description of them we have found is the Incentive Evaluation Commission's December 2, 2025 evaluation of the aircraft excise tax exemption, prepared by PFM Group Consulting. Everything below about exemptions comes from that report's summary, not from the statute text itself, so it should be confirmed against the statute before anyone relies on it.

The report describes seventeen exempt categories under Title 68, Section 6003, alongside an excise tax it dates to 1984. Several are directly relevant to closely held companies:

• Transfers to a newly organized corporation, where the former owners keep control in proportion to their prior interests, and parallel transfers to a partnership or LLC organized by the aircraft's former owners.
• Transfers between corporations or LLCs during a statutory merger, consolidation, or acquisition.
• Transfers out of a corporation, partnership, or LLC to its owners as a payment in kind on dissolution.
• Transfers between spouses, or between parent and child, without valuable consideration, and transfers without consideration between an individual and a revocable express trust.
• Aircraft on which an equal or greater tax was already paid to another state, with the report noting that a lower out-of-state tax triggers tax on the difference.

Beyond those, the report describes exemptions for licensed dealer inventory (excluding aircraft the dealer uses personally or in its business), for aircraft used by commercial airlines that do not operate under Part 91 for more than half of annual operations and that file annual operations reports, for aircraft priced above $2.5 million sold to a nonresident for immediate transfer out of state, and for aircraft bought by an Oklahoma resident and used exclusively in Oklahoma for agricultural spraying, with the tax becoming due if the aircraft is sold, leased, used outside the state, or used for another purpose within three years.

The entity-formation exemption is where owners get into trouble

The transfer-into-a-new-LLC exemption is the one we would flag before any closing. It sounds like a free pass: buy the plane personally, drop it into a holding LLC, pay no second excise tax. The report describes it as an exemption, but it also describes conditions, including that the entity be organized by the former owners and that control stay proportionate to prior ownership.

Those conditions are exactly the detail that gets mangled when an LLC is formed with a different member mix than the original owners, or when the "contribution" is really a sale to a partially owned entity. The report is a consultant's summary; the operative language is in the statute. Treat the exemption as real but worth confirming on the actual facts before the transfer is signed.

How exemptions are actually claimed

One observation from the evaluation report that only a practitioner would find interesting: Form 13-34 captures the sale price but does not capture whether the sale was taxable or exempt, or why. The report says the excise tax is generally collected by the seller, who gathers supporting information from the purchaser to justify any exemption, and that Service Oklahoma does not track the reasons exemptions are claimed.

In practice, that makes the exemption file the buyer's responsibility. If the transfer is questioned later, the documentation assembled at closing is what exists.

Antique aircraft deserve a footnote. Service Oklahoma's page and the form both say qualified antique aircraft carry a $10.00 annual registration fee and, in the same breath, that antique aircraft are not exempt from excise tax.

The annual registration fee by weight and category

Below the excise section, the form turns into a fee grid: rows by maximum gross weight in pounds, columns by category from single engine through rotary wing, multi engine, and turbo prop to turbo jet.

The spread is wide. Under 1,750 pounds, the annual fee runs from $30.00 for a single-engine aircraft to $300.00 for a turbo jet; at 100,001 pounds and over, it runs from $2,250.00 to $22,500.00. Sailplanes, balloons, and home-built aircraft sit outside the grid at a flat $10.00 per year.

The age reduction

For an older aircraft the grid is not the final number. The form states that "The fees of this subsection will be reduced at a rate of ten percent (10%) each year following the date of manufacture," and the reduction continues until the fee reaches half of the original figure, which then applies for each later year. A company buying a twenty-year-old airframe should expect the floor, not the headline rate.

Service Oklahoma also notes that first-year registration is prorated monthly by the month of purchase, so a December closing and a January closing produce very different first-year fees for the same aircraft.

December 31 and the late-renewal ladder

Every Oklahoma aircraft registration expires on the same day. Service Oklahoma's page states it directly: "All aircraft registrations in Oklahoma expire on December 31st."

The penalties then escalate on a schedule. If the registration is not renewed by February 1, a penalty of $0.20 per day accrues until March 1. After March 1, the penalty equals the registration fee itself. The form repeats that last rule: "When renewing late, the penalty fee is the same as the registration fee."

For a light single-engine plane that is a nuisance. For a heavy turbo jet it is a four- or five-figure penalty for missing a date that falls in the same window as everyone's year-end close. We suggest the renewal go on the same calendar as the company's other annual filings: cheap to do on time, expensive to forget.

How the form is filed

Service Oklahoma's page offers online registration through navigate.ok.gov or in-person service at its North Classen location in Oklahoma City, and the printed form carries a Service Oklahoma post office box in Oklahoma City for mailed filings. Whichever channel is used, the documentation attached to the purchase price blank travels with it.

One more piece of the machinery comes from the evaluation report: Service Oklahoma receives FAA registration data monthly, and licensed dealers must report transfers of legal ownership within 30 days. The state has a second path to learn about a transfer the buyer never reported, so filing late and hoping no one notices is just a delay with interest attached.

Why the state is looking at this tax

The Incentive Evaluation Commission's report recommended that the excise exemption be retained with modifications, paired with better data collection and a clearer policy goal for the exemptions. The report's collection figures show the tax growing from $3,492,082 in fiscal 2015 to $8,076,816 in fiscal 2024, after peaking at $8,548,783 in fiscal 2023. A tax that has more than doubled in a decade draws attention, and the report's main complaint was that the state cannot see which exemptions are being used.

Separately, the Oklahoma Tax Commission's 2026 legislation summary describes Senate Bill 1400 as reorganizing and consolidating various sales tax exemptions related to aircraft for clarity and ease of reference, amending Title 68, Section 1357, effective January 1, 2027. That bill concerns the sales-tax exemptions, not the excise tax discussed here, and we have not reviewed what the consolidated text says. A company planning an aircraft purchase that straddles that date should have the sales-tax side reviewed separately.

Where a lawyer earns the cost

Most of Form 13-34 is clerical. The places where legal review pays for itself are narrower: the owner-of-record decision, the fair market value number when the transfer is not an arm's-length sale, and any exemption claim whose conditions live in a statute the form never mentions.

Those are also the places where the excise tax stops being a stand-alone question. The same facts that decide whether a transfer into an LLC is exempt also decide how the aircraft sits inside whatever buy-sell or succession document governs the company. Getting the entity question right once usually answers both.

If your company is closing on an aircraft, or restructuring who owns one it already has, we would rather look at the transfer before the twenty-one days start running than after the penalty has attached. Reach us through the contact page or our Oklahoma City office, and we can talk through the form and the structure together.

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.