Montana charges no sales tax and no use tax on aircraft purchases. Instead, the Montana aircraft tax takes the form of an annual fee in lieu of property tax, set by aircraft type and age, that runs from $30 at the low end to $4,500 for a new pure jet. Registration is due with the Montana Department of Transportation Aeronautics Division on or before March 1 each year, and missing that deadline carries a penalty equal to five times the annual fee.
No Sales or Use Tax on the Purchase
Montana imposes no general sales or use tax, so buying an aircraft in the state triggers zero transaction tax regardless of price. There is no state rate to calculate, no county surcharge, and no secondary use assessment. The rule applies the same to a $40,000 Cessna 172 and a $20 million Gulfstream.
Registered aircraft are also exempt from property tax and “all other taxation,” with the annual registration fee serving as the sole state-level financial obligation.1Montana Legislature. Montana Code 67-3-204 – Fee in Lieu of Tax on Registered Aircraft — Decal That structure is what draws owners to Montana. It also comes with obligations, and one significant risk if the aircraft actually lives somewhere else.
The Annual Fee That Replaces Property Tax
MCA 67-3-206 sets the fee by aircraft category and age bracket. There are nine categories and five age brackets, so the range is wide.2Montana State Legislature. Montana Code 67-3-206 – Schedule of Fees in Lieu of Tax for Aircraft Selected annual fees:
- Single-engine, fixed gear, 200 HP and under: $450 (0–5 years), $262.50 (6–10), $150 (11–20), $75 (21–30), $37.50 (31–40)
- Single-engine, retractable gear, over 200 HP: $1,050 / $600 / $300 / $187.50 / $150
- Multi-engine piston: $1,200 / $750 / $375 / $262.50 / $225
- Piston helicopter: $1,050 / $675 / $337.50 / $225 / $187.50
- Multi-engine jet or turboprop helicopter: $3,000 / $1,500 / $900 / $600 / $300
- Pure jet: $4,500 / $2,250 / $1,200 / $750 / $375
Gliders, ultralights, gyrocopters, balloons, homebuilt aircraft, antiques, and any aircraft more than 40 years old pay a flat $30 per year.2Montana State Legislature. Montana Code 67-3-206 – Schedule of Fees in Lieu of Tax for Aircraft
Age is calculated by subtracting the manufacturer’s designated model year from the current calendar year. If you buy an aircraft before its official model year and first title it in Montana, the purchase year becomes the model year for fee purposes. Fees paid after March 1 are prorated and rounded to the nearest dollar.3Montana Department of Transportation. Montana Department of Transportation Aeronautics Division – Aircraft Registration Form
Who Has to Register
Any civil aircraft customarily kept in Montana must be registered with the Aeronautics Division on or before March 1 each year.4Montana State Legislature. Montana Code 67-3-201 – Aircraft Registration and Licensing Required If you acquire an aircraft mid-year, initial registration is due within 30 days of acquisition.5Legal Information Institute. Montana Administrative Rules 18.12.306 – Required Aircraft Registration Aircraft entering the state for commercial operations must be registered before those operations start.
Individual owners register in the county where they live. Company-owned aircraft register in the county of the owner’s principal place of business. If the aircraft is actually hangared in a different county, you can register it there instead by filing an affidavit.4Montana State Legislature. Montana Code 67-3-201 – Aircraft Registration and Licensing Required
Several categories are exempt from both registration and the annual fee: aircraft owned and operated by the federal government, the state of Montana, or a political subdivision; dealer inventory held solely for resale; aircraft operated by an airline primarily carrying passengers or cargo for hire in interstate or international transportation; and aircraft that are dismantled or otherwise unable to fly.4Montana State Legislature. Montana Code 67-3-201 – Aircraft Registration and Licensing Required
One boundary worth drawing. MCA 67-3-102 generally excuses nonresident pilots from Montana pilot and aircrew licensing if they are lawfully entitled to operate at home. That exemption is about the pilot. If a nonresident’s aircraft is customarily kept in Montana, the aircraft still has to be registered.6Montana State Legislature. Montana Code 67-3-102 – Exceptions
How to Register
Registration runs through form MDT-AER-001. It asks for the N-number, make and model, model year, color, horsepower, engine type (jet, turboprop, or piston), number of engines, gear type, aircraft category, condition, and base airport, along with the owner’s legal name, address, and contact information. First-time registrations also require the purchase date.3Montana Department of Transportation. Montana Department of Transportation Aeronautics Division – Aircraft Registration Form
One detail trips people up. The owner has to submit the application personally. An employee or agent cannot sign for the owner without a power of attorney, and that applies to both individually owned and business-owned aircraft.7Montana Department of Transportation. Montana Department of Transportation – Aircraft Registration
You can file by mail, sending the completed form and payment to the Aeronautics Division in Helena with no additional processing fees, or online through the Aeronautics Division’s electronic portal at app.mt.gov/aeronautics/registration. The portal is run by a third-party vendor, so a convenience fee applies on top of the registration fee.7Montana Department of Transportation. Montana Department of Transportation – Aircraft Registration
Once the department processes the submission, you receive a registration certificate and a decal. The decal has to be displayed on the aircraft at all times as visual proof of current registration. No aircraft subject to Montana registration may legally operate in the state without it.5Legal Information Institute. Montana Administrative Rules 18.12.306 – Required Aircraft Registration
What Late Registration Costs
Missing March 1 is expensive. The penalty is five times the normal annual registration fee, added on top of the fee itself.8Montana State Legislature. Montana Code 67-3-202 – Penalty for Registration Violations On a new jet that owes $4,500, the late penalty is $22,500 for a total of $27,000. Even a piston single in the 11–20 year bracket with a $150 fee would face a $750 penalty and owe $900.
Operating a registered aircraft without a current decal displayed is a misdemeanor.8Montana State Legislature. Montana Code 67-3-202 – Penalty for Registration Violations Collection tools include filing a judicial complaint, seeking wage garnishment, requesting county attorney prosecution, and placing an FAA lien on the aircraft title. The lien is not released until all fees and penalties are paid in full.9Legal Information Institute. Montana Administrative Rules 18.12.316 – Penalties – Waiver – Collection Action
The department can waive the late penalty in limited circumstances. Active-duty members of the U.S. Armed Forces who were deployed and unable to receive a renewal invoice may qualify, with deployment orders as documentation. So may owners who can show a legitimate inability to pay on time, such as a serious medical situation.9Legal Information Institute. Montana Administrative Rules 18.12.316 – Penalties – Waiver – Collection Action
Pilots Register Separately
Aircraft registration is not pilot registration. Under MCA 67-3-211, pilots operating in Montana must register with the Aeronautics Division before flying in the state. The annual pilot registration fee is $10.3Montana Department of Transportation. Montana Department of Transportation Aeronautics Division – Aircraft Registration Form New owners who focus on the aircraft side sometimes miss this.
The Use Tax Risk if the Aircraft Lives Elsewhere
Montana’s lack of sales tax is real, but it does not shield you from tax obligations in other states where you actually base and fly the aircraft. This is where the biggest financial surprises happen, and it is the most important point for anyone considering Montana registration primarily for tax savings.
Most states impose a use tax that mirrors their sales tax. If you register an aircraft in Montana but regularly operate it in a state with a use tax, that state can assert that you owe use tax on the full purchase price. The trigger is typically nexus, which can be established by hangaring the aircraft in the state, making regular landings there, or having other business connections such as payroll or property. Even infrequent landings can create enough nexus in some states to trigger a bill. Multiple states can assert overlapping claims if the aircraft operates across several jurisdictions.
Planning after the fact is far less effective than planning before the purchase. Once a state issues a use tax assessment, options narrow. If you genuinely base the aircraft in Montana and operate primarily within the state, the fee-in-lieu-of-tax system works exactly as intended. The risk concentrates on owners who register in Montana but keep and fly the aircraft elsewhere. If that is your situation, talk to an aviation tax attorney who understands both Montana law and the tax rules in every state where you plan to operate before you close on the aircraft.