Boat loan payments by amount and term
The longer the term, the lower the payment and the higher the total interest. Monthly payments at 8.5% APR:
| Amount financed | 5 years | 10 years | 15 years | 20 years |
|---|---|---|---|---|
| $20,000 | $410.33 | $247.97 | $196.95 | $173.56 |
| $40,000 | $820.66 | $495.94 | $393.90 | $347.13 |
| $75,000 | $1,538.74 | $929.89 | $738.55 | $650.87 |
| $150,000 | $3,077.48 | $1,859.79 | $1,477.11 | $1,301.73 |
| Term | Payment | Total interest | Interest as a share of the loan |
|---|---|---|---|
| 5 years | $820.66 | $9,240 | 23% |
| 10 years | $495.94 | $19,513 | 49% |
| 15 years | $393.90 | $30,901 | 77% |
| 20 years | $347.13 | $43,311 | 108% |
A 20-year loan on a boat that may be sold after eight or ten years means you can still owe a large balance when you want to sell. The amortization schedule in the calculator shows the balance at the end of each year, so you can compare it with what the boat might be worth.
Is boat loan interest tax deductible?
Sometimes. IRS Publication 936 counts a boat as a home for the mortgage interest deduction if it has sleeping, cooking and toilet facilities.[1] If the boat qualifies and the loan is secured by it, the interest can be treated as home mortgage interest on a main or second home, provided you itemize and stay within the overall limits on home mortgage debt in the same publication. A runabout or fishing boat without those facilities does not qualify, and an unsecured personal loan used to buy a boat does not either.
The new deduction for car loan interest for 2025 through 2028 is limited to a new car, minivan, van, SUV, pickup or motorcycle; a boat is not one of them.[5]
Registration, titling and documentation
Most boats with a motor must be registered with the state where they are principally used, and many states also title them. Federal rules require a motorized vessel to carry a number issued on a certificate of number by the state where it is principally operated.[3] Larger vessels can instead be documented with the U.S. Coast Guard: any vessel of at least five net tons wholly owned by U.S. citizens is eligible, including boats used only for recreation, and documentation is required for vessels of that size used in fisheries or coastwise trade. A vessel under five net tons cannot be documented.[2] A documented vessel is exempt from state numbering, and lenders on larger boats may ask for documentation so they can record a preferred ship mortgage.
Sales tax on boatsStates tax boats under their own rules: some cap the tax on a boat, some charge a lower rate than on cars, and many charge use tax if you buy out of state and bring the boat home. Check your state revenue department before you budget, and enter that rate above.
The whole cost of a boat loan
The payment is only part of owning a boat. Insurance, storage or slip fees, winterizing, maintenance, fuel and registration renewals come every year, and a towing vehicle may be needed too. Before you settle on a loan amount, add those yearly costs to the payment and compare the total with your budget, the same way the car affordability calculator does for cars. For other vehicles, see the RV loan calculator and the motorcycle loan calculator; the depreciation calculator helps estimate what the boat will be worth when you sell.
- Compare the APR and the total interest, not the payment. A long term can make a pricey loan look cheap each month; a shorter term reduces the total loan cost.[4]
- Check for prepayment penalties. If you might sell early, a penalty can wipe out the benefit of paying the loan off.
- Keep the down payment meaningful. In the example, $9,000 down on $45,000 keeps the balance closer to the boat's value.
Frequently asked questions
How is a boat loan payment calculated?
Payment = A × r ÷ (1 − (1 + r)−n), where A is the amount financed, r the monthly rate (APR ÷ 12) and n the months. $40,000 at 8.5% for 15 years is $393.90 a month.
How long can you finance a boat?
Each lender sets its own maximum term, usually depending on the loan amount and the age of the boat; we found no official survey of typical boat loan terms. The calculator accepts any term, so compare the total interest of the terms you are offered.
Can I deduct the interest on my boat loan?
Only if the boat has sleeping, cooking and toilet facilities (so it counts as a home under IRS Publication 936), the loan is secured by the boat, and you itemize.[1]
Do I need to register a boat?
A motorized boat needs a state certificate of number from the state where it is principally operated, unless it has a valid Coast Guard marine document.[3]
Sources
- Publication 936, Home Mortgage Interest Deduction (2025)
- 46 CFR Part 67, Documentation of Vessels (§§67.5, 67.7, 67.9)
- 33 CFR Part 173, Vessel Numbering and Casualty and Accident Reporting (§§173.11, 173.15)
- Auto loan answers: key terms
- Working Families Tax Cuts: provisions for individuals and workers (no tax on car loan interest)