Montana has no general sales tax on boats. A $15,000 fishing boat and a $200,000 cruiser both show $0 sales tax. What you pay to put a motorboat, personal watercraft, motorized pontoon, or sailboat 12 feet and over on Montana waters is a one-time permanent registration by length — $65.50 under 16 feet, $125.50 from 16 to under 19 feet, $295.50 at 19 feet and over — plus a $10 certificate of ownership (title). A 15-foot motorboat is $75.50. A 17-foot boat is $135.50. A 22-foot boat is $305.50. Pay the county treasurer; Montana Motor Vehicle Division and Fish, Wildlife & Parks publish the table. This page estimates those published dollars. The county treasurer, MVD, and FWP set the receipt.
How much is Montana boat registration?
People type “Montana boat sales tax calculator” because neighboring states charge a percent of the purchase price. Montana does not. The bill is a length class plus a title, paid once as permanent registration (MVD describes a permanent decal). Do not multiply $200,000 by 6% or 7% and call that Montana. Do not treat the $295.50 class as an annual renewal of the same dollar.
| Boat | Sales tax | Permanent reg + $10 title |
|---|---|---|
| 15-foot motorboat, any price | $0 | $75.50 |
| 17-foot motorboat or PWC in the 16–under-19 class | $0 | $135.50 |
| 22-foot motorboat (19 feet and over) | $0 | $305.50 |
| Kayak or canoe, paddle only | $0 | Generally exempt |
| 11-foot sail, no motor | $0 | Generally exempt |
Example 1: $200,000 boat vs $20,000 boat, both 22 feet
Scenario: Two Montana buyers. One pays $200,000 for a 22-foot cruiser. The other pays $20,000 for a 22-foot used runabout. Both must register as motorboats 19 feet and over.
Price drops out of the Montana tax math because there is no sales tax. Length picks the registration class. Title is $10 on both files.
Example 2: 15-foot motorboat at any price
Scenario: A 15-foot tiller boat, motorized, bought from a dealer or a neighbor.
Adding a motor can move a previously exempt hull onto the permanent-registration list. Ask FWP before you assume a canoe path still applies.
- Montana MVD — Watercraft Registration — permanent fee table $65.50 / $125.50 / $295.50
- Montana FWP — Boating rules — who must register; $10 title
The tax rule: none — fee in lieu by length
Montana has no general statewide sales tax and no local sales tax on boats. The watercraft charge is a one-time permanent registration under Montana’s motor-vehicle fee structure, paid to the county treasurer. MVD and FWP publish the length brackets. Think of it as a fee in lieu of a percent tax, not as “Montana boat sales tax at X percent.”
Who must register: motorboats, personal watercraft, motorized pontoons, and sailboats 12 feet and over. Who is generally exempt: non-motor sailboats under 12 feet, manually propelled boats of any length, lifeboats, and government craft. If your boat is on the must-register list, length — not horsepower and not purchase price — picks $65.50, $125.50, or $295.50.
Example 3: 17-foot boat (middle bracket)
Scenario: A 17-foot motorboat or a 17-foot sailboat that must register (sail 12 feet and over).
Seventeen feet is the middle class. Nineteen feet jumps to $295.50. Measure the boat the way FWP and the manufacturer record length.
Example 4: 11-foot sail vs 12-foot sail
Scenario: Two sailboats, neither with a motor. One is 11 feet. One is 12 feet.
The 12-foot line is a registration trigger for sail, not a sales-tax trigger. Sales tax is $0 on both hulls.
- FWP boating rules — motorboats, PWC, motorized pontoons, sail ≥12 feet; exemptions
- MVD watercraft registration — permanent fees; no sales-tax percent
Dealer vs private (still $0 sales tax)
A Montana dealer does not collect boat sales tax, because there is none. A private seller does not collect boat sales tax either. Both paths still need ownership papers so the county can issue the $10 title and permanent registration. Trade-in does not change a sales-tax line that is already $0. A $10,000 trade on a $50,000 hull does not create a Montana tax savings, because Montana was not going to tax the $50,000. The county treasurer is the window that takes the fee; FWP writes who must number the boat; MVD publishes the three-line table. If those three offices sound like three different bills, they are three roles on one $0-tax purchase.
If a dealer invoice shows a “sales tax” line on the boat, ask what jurisdiction that line is for. It is not a Montana statewide boat sales tax. Trailer tax, if any, is a different bill through Montana’s vehicle side — this page does not quote trailer dollars.
Example 5: Dealer purchase, 18-foot motorboat
Scenario: Licensed dealer, $35,000, 18-foot motorboat, $8,000 trade-in.
Pay the county treasurer for title and permanent registration. The dealer invoice should not be adding a Montana boat percent.
Example 6: Private-party 22-foot boat
Scenario: Bill of sale for $12,000. 22-foot motorboat. New owner applies within 40 days, as FWP’s boating laws require.
Bring the bill of sale and the prior title or ownership certificate. The 40-day transfer clock is an FWP timing rule, not a sales-tax penalty schedule — this research pack does not publish a late-fee dollar, so ask the county if you are late.
- MVD / FWP — no general sales tax; county treasurer process
- FWP boating laws PDF — new owner applies within 40 days
No local sales-tax overlay
Montana cities and counties do not add a local sales tax on the boat purchase. There is no “Missoula 3%” or “Flathead extra percent” on this page because Montana does not run a general local sales tax on watercraft. You still go to a county treasurer to pay the statewide permanent fee and $10 title. That is collection, not a local tax rate.
Do not confuse Montana’s car county-option stories with boats. This watercraft page is $0 sales tax statewide, plus the length fee.
Example 7: Same 17-foot boat in two counties
Scenario: One buyer titles in Yellowstone County. Another titles in Gallatin County. Same 17-foot motorboat.
The published MVD/FWP dollars match. Office hours and forms can differ. The rate does not.
Example 8: Why a “local boat tax” quote is usually a mix-up
Scenario: A salesperson adds 3% “local” on a $40,000 Montana delivery.
If you are taking delivery in another state, that other state may tax the sale. Montana’s own boat purchase still has no sales-tax percent.
- Montana — no general sales tax; no local boat sales tax in the official watercraft materials
- MVD watercraft registration — statewide length schedule collected at the county
Permanent registration and the $10 title
MVD’s watercraft table is three lines. Under 16 feet: $65.50. From 16 feet to under 19 feet: $125.50. Nineteen feet and over: $295.50. FWP lists the certificate of ownership (title) at $10. Validation-decal practice follows current FWP and MVD instructions (permanent decal). This page does not add an extra decal dollar that those pages do not list in the research pack.
New owners apply within 40 days under FWP boating laws. This pack does not publish a late-penalty dollar for missing day 40. If you are late, ask the county treasurer and FWP rather than guessing a fine.
| Length | Permanent registration | With $10 title |
|---|---|---|
| Under 16 feet | $65.50 | $75.50 |
| 16 to under 19 feet | $125.50 | $135.50 |
| 19 feet and over | $295.50 | $305.50 |
Example 9: Bracket edges at 16 feet and 19 feet
Scenario: Three motorboats measured at 15.9 feet, 16.0 feet, and 19.0 feet.
A round “16-foot boat” in an ad may be 15 feet 10 inches or 16 feet 2 inches on the manufacturer’s plate. Use the length FWP and MVD will accept, not the classified-ad title.
Example 10: Permanent fee is not an annual copy of itself
Scenario: A buyer budgets $295.50 every year for a 22-foot boat because they came from a state with annual numbering fees.
Budget the one-time length class and $10 title. For anything after that, use current FWP/MVD instructions, not a copied annual charge.
- MVD watercraft registration — $65.50 / $125.50 / $295.50
- FWP boating rules — $10 title; 40-day transfer in boating laws PDF
Gifts, inheritance, out-of-state boats, and documented vessels
Gifts and inheritances still have $0 sales tax. You still complete title and registration if the boat must be registered. An 18-foot gifted motorboat is the same $125.50 + $10 as a purchased 18-foot motorboat. There is no Montana percent to wipe, and no Montana percent to accidentally charge on fair-market value.
Military buyers are in the same $0 sales-tax world. Registration rules still apply if the vessel must be numbered in Montana. This pack does not publish a military registration-fee waiver dollar.
Coast Guard documented vessels: still $0 Montana sales tax. Follow the county and FWP process for whatever registration they require. Do not skip FWP because the hull has a federal document.
Out-of-state visitors: FWP boating materials discuss short-stay / 90-day themes. Confirm the current visiting rule on FWP’s boating-laws PDF before you assume a summer on Flathead is free of Montana numbering. This page does not assign a visitor sales tax, because Montana has none, and it does not assign a visitor registration dollar that FWP did not put in the fee table above.
Example 11: Gift of an 18-foot motorboat
Scenario: Parent gifts an 18-foot motorboat. No money changes hands.
Complete the county title/registration transfer. Sales tax does not appear because Montana does not charge it, not because a gift form zeroed a percent.
Example 12: Inheritance vs a $200,000 purchase
Scenario: An heir takes a 22-foot boat from an estate. A neighbor buys a different 22-foot boat for $200,000.
Ownership story changes the paperwork. It does not change Montana’s published length fee or create a sales tax.
- FWP / MVD — $0 sales tax on purchase, gift, and inheritance
- FWP boating laws — transfer 40 days; visitor/90-day themes (confirm current PDF)
How to calculate your Montana boat bill
- Write $0 on the sales-tax line. Do not apply a percent to price.
- Ask whether the boat must be registered: motorboat, PWC, motorized pontoon, or sail 12 feet and over. If it is paddle-only or non-motor sail under 12 feet, stop — generally no length fee.
- If it must register, pick the length class: under 16 feet $65.50; 16 to under 19 feet $125.50; 19 feet and over $295.50.
- Add $10 title when you are obtaining the certificate of ownership.
- Pay the county treasurer. Check FWP for any current AIS or visitor pass that is not in the three-line table — those dollars must come from FWP, not from this page.
Example 13: Walkthrough — 15-foot motorboat
Scenario: Dealer or private, any price, 15-foot motorboat, Montana resident.
That is the full published stack this page will quote. AIS or other FWP passes, if they apply to you, are extra only after FWP states the current amount.
Example 14: Walkthrough — kayak and a 22-foot PWC
Scenario: Household buys a paddle kayak and a 22-foot personal watercraft.
Do not put the kayak in the $65.50 class “just in case.” FWP’s exemption is the rule unless your kayak is motorized.
- MVD watercraft registration — length formula
- FWP boating rules — vessel types and exemptions
What this page does not estimate
This page estimates $0 sales tax, the three permanent-registration amounts, and the $10 title. It does not quote aquatic invasive species prevention passes (FWP has discussed a nonresident motorized pass — confirm the current FWP amount; this page does not lock a pass dollar). It does not quote trailer registration through the vehicle side of MVD/DMV. It does not quote dealer document fees, marina fees, or a late-transfer fine for missing the 40-day window. It does not quote a visiting-boater numbering fee beyond “ask FWP.” It does not apply a sales-tax percent from Idaho, Wyoming, or North Dakota to a Montana delivery.
Example 15: AIS pass is not in the $65.50 table
Scenario: A nonresident will launch a motorboat and has heard about an AIS prevention pass.
Call or read current FWP AIS instructions. Do not copy an old pass figure from a forum.
Example 16: Trailer vs boat
Scenario: The boat is $0 sales tax and $305.50 published boat fees. The trailer sits on a separate title.
Ask MVD’s vehicle side for trailer fees. Ask the county treasurer for the boat.
Two complete buying examples
Example 17: Resident dealer buy, 17-foot fishing boat
Scenario: Montana resident. Dealer. 17-foot motorboat. $28,000. $4,000 trade-in. Applies on time at the county treasurer.
If the dealer also sells a trailer, keep that quote on a separate line.
Example 18: Gift 22-foot boat plus a paddle canoe
Scenario: Family gifts a 22-foot motorboat. The same weekend they buy a paddle canoe.
The canoe does not pick up a $65.50 fee just because it arrived with a motorboat.
Common questions
Does Montana have sales tax on boats?
No. Statewide general sales tax is not charged. Local sales tax is not added on the boat. You pay permanent registration by length and a $10 title.
Is the fee annual?
MVD describes permanent registration. Do not budget the same $65.50 / $125.50 / $295.50 as an automatic yearly copy of that line without checking current FWP/MVD decal rules.
Do I register a kayak?
Manually propelled boats of any length are generally exempt. A motorized kayak is a motorboat and follows the length table.
What about a 12-foot sailboat?
Sailboats 12 feet and over must register. Under 16 feet that is $65.50 plus $10 title. Non-motor sail under 12 feet is generally exempt.
Does a Coast Guard document skip Montana fees?
It does not create a sales tax, and it does not automatically skip FWP/county process. Ask FWP how documented vessels are handled in your county.
Example 19: Percent-tax myth on $50,000
Scenario: A quote uses 6% because “everyone charges sales tax.”
Ask the seller to show MVD’s length table, not a percent.
Example 20: 18-foot vs 19-foot
Scenario: Shopping two similar used boats.
Length class is the only published Montana dollar that changes between those two hulls on this page.
Before you sign
Write length from the manufacturer or title, not the ad headline. Decide whether the boat is motorized or paddle-only, and whether a sailboat is 12 feet or over. Expect $0 sales tax. Expect $65.50, $125.50, or $295.50 plus $10 if it must be registered. Plan to visit the county treasurer within 40 days of becoming the owner. Check FWP for AIS and visitor rules that sit outside this table. If an invoice shows a Montana boat sales-tax percent, that line does not match MVD and FWP. A $200,000 boat does not “owe more tax” in Montana than a $20,000 boat of the same length — both are $0 tax plus the same length class.
Example 21: Checklist — 15-foot motorboat
Scenario: Resident purchase.
Total this page quotes: $75.50 plus any FWP pass they currently charge you.
Example 22: Checklist — paddle craft only
Scenario: Buying canoes for a family trip.
FWP’s exemption list is the authority, not a marina’s habit of selling decals with every hull.
Complete reference list
- Montana MVD — Watercraft Registration — permanent fees $65.50 / $125.50 / $295.50
- Montana FWP — Boating rules and regulations — who must register; $10 title; exemptions
- Montana FWP — Boating Laws PDF — transfer within 40 days; exemptions; visitor themes
This page estimates Montana boat costs as $0 sales tax plus the published permanent-registration amounts and $10 title. The county treasurer, Montana Motor Vehicle Division, and Fish, Wildlife & Parks set what you pay. Confirm AIS passes and visitor rules with FWP.