Buying a boat in Missouri involves more than just the sticker price. State law requires buyers to pay sales tax, local taxes, title fees, and registration fees — and the exact amount depends on where you live, how you’re buying, what kind of boat it is, and whether you’re trading something in. The calculator described here follows Missouri’s official tax code to compute every charge, step by step. This guide explains each step in plain language, with two real-world examples for each.
Missouri’s base state sales tax rate on boats is 4.225%, as set by the Missouri Department of Revenue.1 Local taxes — county and city — are added on top. Title and registration fees are fixed amounts set by state statute.2 There are also special rules for U.S. Coast Guard documented vessels, out-of-state buyers, and trade-ins.
“The total you owe isn’t just 4.225% of the purchase price. Location, trade-ins, boat type, and a handful of flat fees all factor in before you reach a final number.”
Step 1: Find Your Location Tax Rate
Missouri law requires that boat sales tax be collected based on the owner’s address — not where the boat is purchased.3 If you’re a Missouri resident, the calculator looks up the combined county and city tax rate for your ZIP code. If you’re an out-of-state buyer who will keep the boat in Missouri, it uses the rate for wherever the boat will be docked or stored.
The Missouri Department of Revenue publishes quarterly tax-rate tables that break down these local rates county by county and city by city.4 Here are some common combined local rates (local portion only, not including the 4.225% state rate) as of early 2026:
| Location | Local Rate | Total (State + Local) |
|---|---|---|
| St. Louis County (unincorporated) | 3.513% | 7.738% |
| Greene County (outside Springfield) | 1.750% | 5.975% |
| Kansas City (Clay County) | 4.500% | 8.725% |
| Boone County (unincorporated) | 1.750% | 5.975% |
| Columbia (Boone County) | 3.750% | 7.975% |
| St. Charles County (unincorporated) | 1.725% | 5.950% |
Example A — Missouri Resident in St. Louis County
Sarah lives in Kirkwood, Missouri (St. Louis County). The calculator looks up her ZIP code and finds a local rate of 3.513%. Combined with the state’s 4.225%, her total sales tax rate is 7.738%.
Example B — Out-of-State Buyer Keeping Boat in Missouri
David lives in Kansas but will store his new boat at a marina in Columbia, Missouri. Since he’s not a Missouri resident, the calculator uses the rate for Columbia — a local rate of 3.750% — for a combined rate of 7.975%.
Step 2: Calculate Your Net Taxable Price
You don’t pay tax on the full purchase price if you’re trading in a boat or receiving a manufacturer’s rebate. Under RSMo §144.025, both trade-in values and rebates reduce the taxable base before any tax is calculated.5 The formula is simple:
Net Taxable Price = Purchase Price − Trade-In Value − Rebate Amount
(Minimum of $0 — the taxable price can never go below zero)
Example A — Boat with a Trade-In
Marcus buys a $50,000 boat and trades in his old boat, valued at $5,000. His net taxable price is:
$50,000 − $5,000 − $0 = $45,000 taxable
He only pays sales tax on $45,000, not the full $50,000.
Example B — Large Trade-In That Covers Most of the Price
Linda buys a $20,000 boat and trades in a boat worth $18,000, plus gets a $2,500 manufacturer’s rebate:
$20,000 − $18,000 − $2,500 = −$500 → floored to $0 taxable
Because the trade-in and rebate together exceed the price, Linda owes no sales tax at all.5
Step 3: Check for Tax Exemptions
Before calculating any tax, the calculator checks whether you qualify for one of two important exemptions:
Documented vessels — Boats registered with the U.S. Coast Guard (rather than the state) are completely exempt from Missouri sales and use tax.6 Instead, they pay a flat “in-lieu” excise tax (covered in Step 4A below).
The 90-day rule for non-residents — If you’re not a Missouri resident and the boat was titled and used in another state for 90 days or more before you registered it in Missouri, you owe no Missouri sales tax.7 You’ll still pay title and registration fees, but the tax itself is waived.
Example A — Documented Vessel (USCG Registered)
Robert owns a 42-foot cruiser registered with the U.S. Coast Guard. Because it’s documented, the calculator immediately skips the normal sales tax calculation and jumps to the in-lieu tax table instead. No 4.225% state tax, no local tax.
Example B — Non-Resident with 90+ Days Out of State
Jennifer is an Illinois resident who bought a boat in Illinois six months ago (180+ days). She’s now registering it in Missouri. Because she is not a Missouri resident and the boat has been operated outside Missouri for more than 90 days, the calculator sets her tax to $0. She only pays the title and registration fees.7
Step 4A: In-Lieu Tax for USCG Documented Vessels
If your boat is documented with the U.S. Coast Guard, you pay a flat excise tax instead of the regular sales tax. The amount depends on the purchase price and comes from a bracket table established by Missouri statute (RSMo 306.016).8 Here are some key brackets:
| Purchase Price Range | In-Lieu Tax Due |
|---|---|
| $0 – $14,999 | $500 |
| $15,000 – $29,999 | $650 |
| $30,000 – $49,999 | $850 |
| $50,000 – $74,999 | $1,100 |
| $75,000 – $99,999 | $1,350 |
| $100,000 – $149,999 | $1,850 |
| $150,000 – $199,999 | $3,000 |
| $200,000 – $299,999 | $4,500 |
| $650,000 – $1,249,999 | $10,500 |
| $1,250,000+ | $15,000 |
Example A — $200,000 Documented Yacht
Thomas buys a documented yacht for $200,000. The calculator looks up the bracket: $150,000–$199,999 = $3,000 in-lieu tax. That’s it — no percentage-based sales tax, just a flat $3,000.
Example B — $60,000 Documented Cruiser
Amelia buys a documented cruiser for $60,000. The bracket is $50,000–$74,999, so her in-lieu tax is $1,100. Had this boat not been documented, she would have paid roughly $3,600 in sales tax (at a 6% combined rate). The in-lieu tax saves her about $2,500.
Step 4B: Normal Sales Tax Calculation
If your boat is not documented and you’re not exempt under the 90-day rule, the calculator applies the standard sales tax to your net taxable price from Step 2. The state portion is always 4.225%.1 The local portion comes from Step 1. Both are applied to the same net taxable base.
State Tax = Net Taxable Price × 4.225%
Local Tax = Net Taxable Price × Local Rate
Total Sales Tax = State Tax + Local Tax
Example A — St. Louis County Purchase with Trade-In
Marcus (from Step 2) has a net taxable price of $45,000. He lives in St. Louis County (local rate: 3.513%).
State Tax: $45,000 × 4.225% = $1,901.25
Local Tax: $45,000 × 3.513% = $1,580.85
Total Sales Tax: $3,482.10
Example B — Greene County Purchase, No Trade-In
Paul buys a $40,000 boat in Springfield with no trade-in. He lives in Greene County (local rate: 1.750%).
State Tax: $40,000 × 4.225% = $1,690.00
Local Tax: $40,000 × 1.750% = $700.00
Total Sales Tax: $2,390.00
Step 5: Title Fees
Missouri charges a flat $7.50 title fee for any boat or vessel.2 If your boat has an outboard motor, that motor requires its own separate title at $5.00.9 Every title transaction also incurs a $9.00 processing fee charged by the license office.2
Example A — Inboard Engine (No Separate Motor Title)
Sarah’s new bowrider has an inboard engine, so no separate motor title is needed.
Boat title: $7.50 + $9.00 processing = $16.50 total
Example B — Boat with an Outboard Motor
Kevin’s fishing boat has an outboard motor, requiring two title transactions.
Boat title: $7.50 + $9.00 = $16.50
Outboard title: $5.00 + $9.00 = $14.00
Total title fees: $30.50
Step 6: Registration Fees
Missouri boat registration fees are set by statute and depend on the length of your vessel.2 Each registration also carries the $9.00 processing fee. Outboard motors require a separate registration at $2.00 plus $9.00 processing.9
| Boat Length | Registration Fee | With $9 Processing |
|---|---|---|
| Under 16 feet | $25.00 | $34.00 |
| 16 to under 26 feet | $55.00 | $64.00 |
| 26 to under 40 feet | $100.00 | $109.00 |
| 40 feet and over | $150.00 | $159.00 |
Example A — 20-Foot Pontoon (Inboard)
A 20-foot pontoon falls in the “16 to under 26 feet” bracket.
Registration: $55.00 + $9.00 = $64.00
Example B — 30-Foot Cruiser with Outboard
A 30-foot cruiser with a separate outboard motor requires two registrations.
Boat registration (26–40 ft): $100.00 + $9.00 = $109.00
Outboard registration: $2.00 + $9.00 = $11.00
Total registration fees: $120.00
Step 7: Processing Fees
Missouri license offices charge a $9.00 processing fee for each individual document they handle — meaning each title and each registration is its own $9 charge.2 The calculator totals these up based on how many documents you need. This is already included in the per-document amounts shown in Steps 5 and 6, but it’s important to understand they stack.
Example A — Boat with Title and Registration Only
If you’re doing a boat title and a boat registration (no outboard motor), you pay two $9.00 processing fees.
2 documents × $9.00 = $18.00 in processing fees
Example B — Boat with Outboard Motor (Four Documents)
A boat with an outboard motor requires four documents: boat title, boat registration, outboard title, outboard registration.
4 documents × $9.00 = $36.00 in processing fees
Step 8: Temporary Permit Fee
If you need to move your boat before the permanent registration is issued — for example, to drive it home from the dealer — you can purchase a 30-day temporary permit.8 The permit costs $5.00 plus the standard $9.00 processing fee, for a total of $14.00. Most buyers skip this if the dealer handles registration promptly.
Example A — Buyer Needs to Trailer the Boat Immediately
Greg is driving his new boat 200 miles home before registration paperwork arrives. He gets a temp permit.
Temp permit: $5.00 + $9.00 processing = $14.00
Example B — Buyer Waives the Temp Permit
Maria’s boat is staying at the dealer’s marina for two weeks while her registration is processed. She does not need a temporary permit, so this step adds $0.00 to her total.
Step 9: Trailer Costs
If you’re purchasing a trailer with your boat, the trailer is taxed and titled separately. Trailers in Missouri are titled by the Department of Revenue, and their title fee is $7.50 plus $9.00 processing. Registration is also $7.50 plus $9.00 processing.10 Trailer tax is calculated on the full trailer price — there is no trade-in credit applied to a trailer.
Trailer Tax = Trailer Price × (4.225% + Local Rate)
Trailer Fees = ($7.50 + $9.00) title + ($7.50 + $9.00) registration = $33.00
Example A — $5,000 Trailer in Greene County
Paul (from Step 4B) adds a $5,000 trailer. His local rate is 1.750%.
Trailer Tax: $5,000 × (4.225% + 1.750%) = $5,000 × 5.975% = $298.75
Trailer Fees: $33.00
Total trailer costs added: $5,331.75
Example B — $8,000 Trailer in St. Louis County
Sarah adds an $8,000 trailer. Her local rate is 3.513%.
Trailer Tax: $8,000 × (4.225% + 3.513%) = $8,000 × 7.738% = $619.04
Trailer Fees: $33.00
Total trailer costs added: $8,652.04
Step 10: Your Grand Total
The calculator adds everything together to produce a final “amount due at title.” The formula is:
Grand Total = Purchase Price
+ Total Sales Tax (or In-Lieu Tax)
+ Title Fees
+ Registration Fees
+ Processing Fees
+ Temp Permit (if selected)
+ Trailer Price + Trailer Tax + Trailer Fees (if applicable)
+ Dealer Documentation Fee
− Trade-In Value
− Rebate Amount
Note on dealer documentation fees: Missouri dealers may charge an administrative documentation fee for processing paperwork. By statute, this fee is capped at approximately $500.11 It is not subject to sales tax when listed separately.
Example A — St. Louis County Resident, $50,000 Boat, $5,000 Trade-In
Full calculation for Marcus: $50,000 boat, $5,000 trade-in, 26-ft boat, inboard engine, no trailer, $200 dealer doc fee, St. Louis County (3.513% local).
Purchase Price: $50,000.00
Sales Tax (on $45,000): + $3,482.10
Title Fee: + $16.50
Registration (26 ft): + $109.00
Processing Fees: + $18.00
Dealer Doc Fee: + $200.00
Trade-In Credit: − $5,000.00
──────────────────────────────────
Grand Total: $48,825.60
Example B — Greene County Resident, $40,000 Boat + $5,000 Trailer, No Trade-In
Full calculation for Paul: $40,000 boat, no trade-in, 30-ft boat, inboard engine, $5,000 trailer, $300 dealer doc fee, Greene County (1.750% local).
Purchase Price: $40,000.00
Sales Tax (boat): + $2,390.00
Title Fee (boat): + $16.50
Registration (26 ft): + $109.00
Processing Fees: + $18.00
Trailer Price: + $5,000.00
Trailer Tax: + $298.75
Trailer Fees: + $33.00
Dealer Doc Fee: + $300.00
──────────────────────────────────
Grand Total: $48,165.25
Key Things to Remember
Missouri’s boat tax rules have a few key points that catch buyers off guard. First, the tax rate is based on where you live, not where you buy the boat — so driving to a neighboring county to save on local taxes generally won’t work. Second, USCG-documented boats always pay the flat in-lieu tax, regardless of size or price, which can be a significant saving on higher-value vessels. Third, trade-in credits are powerful — always document your trade-in value properly with a title or bill of sale to make sure the deduction is applied. And finally, don’t forget to count every $9.00 processing fee — they add up quickly when you have multiple documents to file.
Missouri residents are required to title their newly purchased boat within 60 days of purchase to avoid late fees.1 The best practice is to work with your dealer to handle title and registration at the point of sale, ensuring everything is submitted on time and correctly.
Sources & References
- Missouri Department of Revenue — Titling and Tax Manual. Missouri state sales tax rate of 4.225% on boats and watercraft; requirement to title within 60 days of purchase.
- Missouri Revised Statutes — Boat title fee ($7.50), registration fees by length ($25–$150), and $9.00 per-document processing fee charged by license offices.
- RSMo §144.069 — Sales tax for watercraft is assessed at the rate in effect at the owner’s address (buyer’s residence, or boat-location ZIP for non-residents).
- Missouri Department of Revenue — Quarterly Sales Tax Rate Tables. Published for every county, city, and special taxing district; updated each quarter.
- RSMo §144.025 — Trade-in and rebate allowances: tax applies only to the purchase price minus any documented trade-in value and manufacturer rebates.
- Missouri State Tax Commission — USCG documented vessels are exempt from Missouri sales and use tax.
- Missouri DOR Titling Manual — Non-residents who have titled and operated the boat outside Missouri for 90 or more days before registration owe no Missouri tax.
- RSMo 306.016 — In-lieu excise tax brackets for documented vessels; also governs 30-day temporary permit fee of $5 plus $9 processing.
- Missouri DOR — Outboard motor title fee: $5.00 + $9.00 processing; outboard registration: $2.00 + $9.00 processing.
- Missouri DOR — Trailer title: $7.50 + $9.00 processing; trailer registration follows motor vehicle fee schedule at $7.50 + $9.00 processing.
- Missouri Statute / DOR Guidance — Dealer documentation fees capped at approximately $500 (inflation-adjusted); not subject to sales tax when separately stated.