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Boat Loan Calculator

U.S. only tools

A boat loan is a simple-interest installment loan like a car loan, with three differences that change the answer: what is being financed is usually a hull, a motor and a trailer that can be taxed and registered separately; the terms run as long as 20 years; and the buyer very often sells the boat before the loan ends. This page prices the deal you are actually being offered, and then puts all four common terms side by side — because the payment is the number the dealer quotes and the interest is the number the loan costs.

Boat Loan Calculator - Danfio

https://danfio.com/tools/boat-loan-calculator/ - printed from this page

Currency: USD ($) - display only, nothing was converted

$

The out-the-door price of the boat, motor and trailer before tax and fees.

$

The cash you pay on the day, from the purchase agreement.

$

Credited against the price, and against sales tax in most states.

Charged on the price less the trade-in. Your state may tax the trailer separately, or charge an annual excise instead.

$

The dealer costs that get rolled into the loan rather than paid on the day.

The APR quoted on the loan offer, per year.

The length of the loan; a longer term lowers the payment and raises the interest.

$

Anything above the scheduled payment, applied straight to the balance.

The month of the first payment, which sets the whole schedule.

Results update as you type. Nothing leaves your device.

Currency symbol

Symbol only - nothing is converted and no exchange rate is used. Figures quoted in the explanation text stay as the sources publish them.

Monthly boat payment

$487.26

$39,300 financed over 10 years at 8.5%, with $19,171.65 of interest.

Amount financed
$39,300
Sales tax
$2,700.00
Total interest
$19,171.65
Last payment
Oct 2036

The deal

Price with motor and trailer
$45,000
Cash due at signing
$9,000 the down payment
Taxable amount
$45,000 price less trade-in
Total cost of the boat
$67,472 down payment plus every payment

What makes up the financed amount

  • Boat, motor and trailer$36,000.00
  • Sales tax$2,700.00
  • Dealer fees$600.00

Interest is charged on the tax and the fees as well as on the boat, which is why rolling them in costs more than the sticker suggests.

The same boat over four terms

TermA monthTotal interestTotal paidInterest per $1 borrowed
5 years$806.30$9,078$48,378$0.23
10 years$487.26$19,172$58,472$0.49
15 years$387.00$30,360$69,660$0.77
20 years$341.05$42,553$81,853$1.08

All four rows finance the same $39,300 at the same 8.5%. Stretching the term is how the payment gets small — and how the interest gets large.

Extra principal is the cheapest way to shorten a boat loan: it cuts the interest rather than moving it around. Put a figure in that field to see the months and the interest it removes.

What the down payment changes

Cash downAmount financedA monthTotal interest
0% ($0)$48,300$598.85$23,562
10% ($4,500)$43,800$543.06$21,367
20% ($9,000)$39,300$487.26$19,172
30% ($13,500)$34,800$431.47$16,976

Each row keeps the 10 years term and the same rate; only the cash down, and the tax it does not change, are held constant.

Amortization schedule

YearPaymentsInterestPrincipalBalance
Year 1$5,847$3,241$2,607$36,693
Year 2$5,847$3,010$2,837$33,856
Year 3$5,847$2,759$3,088$30,768
Year 4$5,847$2,486$3,361$27,408
Year 5$5,847$2,189$3,658$23,750
Year 6$5,847$1,866$3,981$19,769
Year 7$5,847$1,514$4,333$15,436
Year 8$5,847$1,131$4,716$10,720
Year 9$5,847$714$5,133$5,587
Year 10$5,847$261$5,587$0

The monthly view lists every payment; export the CSV to keep a copy of the schedule.

What this page does not price: insurance, the slip or the dry stack, winterizing, maintenance, fuel, trailer registration and any state excise tax. Boats also get sold before the loan is paid off more often than cars do, and a 10 years term makes the balance fall more slowly than the boat loses value — the schedule above is the thing to look at before agreeing to a long one. A bank or credit union usually beats dealer financing, so compare the APR before signing.

Everything here is your own figure: the price, the tax your state charges, the fees the dealer rolls in and the rate you were quoted. No lender rate is assumed, because the rate a lender offers depends on the hull, the age of the boat, the term and your credit, and one printed number would be wrong for nearly everybody.

About this boat loan calculator

Like a car loan, a boat loan is a simple-interest installment loan, but the collateral, the terms and the exit all differ: what is financed may be a hull, a motor and a trailer taxed separately, terms run to twenty years, and the boat is often sold long before the loan matures.

The payment follows the standard annuity formula P × r ÷ (1 − (1 + r)^−n) applied to the financed amount, with interest charged monthly on the outstanding balance — the same calculation the other loan pages use. No lender rate is assumed, and the calculation stays local to your device, so nothing you type is sent anywhere.

Hull insurance, lien fees, mooring, winterizing, fuel, trailer registration and any prepayment penalty are costs of owning the boat rather than of the loan, and they sit outside this model. This is an arithmetic page, not financial or lending advice. Compare the four terms side by side and enter the tax that applies to your own purchase.

How this boat loan calculator works

What actually gets financed

The financed amount is the price, less the cash you pay down, less any trade-in, plus sales tax and the dealer fees that are rolled into the loan. Sales tax is charged on the price less the trade-in in most states, which is why a trade-in is worth more than its own value: it removes tax as well. Some states charge an annual excise or personal property tax on a boat instead of sales tax, and the trailer is often taxed and registered as a separate vehicle — one rate field cannot cover every state, so put in the tax that applies to your purchase.

Interest is then charged on the whole financed amount, tax and fees included. That is worth noticing: a $600 documentation fee financed over 10 years at 8.5% is repaid as $893, of which $293 is interest.

The payment, and the formula behind it

The scheduled payment is the standard annuity payment: P × r ÷ (1 − (1 + r)^−n), where P is the financed amount, r is the monthly rate (the APR divided by twelve) and n is the number of months. Every month, interest is charged on the balance that is left and the rest of the payment reduces the principal — which is why a 20-year loan on the same amount carries more than four times the interest of a 5-year loan at the same rate.

Boats are secured loans, so the lender holds a lien on the hull and usually requires insurance for the life of the loan; neither the insurance nor the lien fee is part of the payment this page prints. A longer term lowers the payment but leaves the balance higher for longer, and that matters more on a boat than on a car, because boats are usually sold years before a 20-year loan matures. If the sale price is less than the balance, the difference has to be settled at the sale.

Extra principal is the cheap lever

Every extra dollar of principal stops earning interest from the day it is paid, and it shortens the loan from the end. On the sample deal on this page the extra-payment block shows both effects at once: months removed and interest saved. There is no separate formula hiding here — the schedule is rebuilt with the larger payment and compared with the schedule without it.

What extra principal does not do is reduce next month’s scheduled payment. The payment stays the same and the loan simply ends sooner, unless the lender agrees to recast the loan.

End-of-loan fees, and the costs that run alongside

A boat loan is a secured loan, so the lender holds a lien on the hull and usually requires insurance for the whole life of the loan; neither the insurance nor the lien fee is part of the payment this page prints. The sale matters more on a boat than on a car, because boats are usually sold years before a 20-year loan matures — and if the sale price is less than the balance, the difference has to be settled at the sale.

Running costs sit in the same month as the payment: hull insurance, a slip or dry stack, winterizing, bottom paint, engine service, fuel and registration continue whether the boat is used or not. They are costs of owning the boat rather than of the loan, so they are not in the payment — but a boat whose payment you can only just afford is usually a boat you cannot afford. Extra principal is the one lever inside the loan itself: it removes months from the end and interest along with them, exactly as the extra-payment block on the page shows.

Worked examples

Each example below was run through the calculator on this page when the site was built, so the numbers match what you see when you enter the same inputs.

A $45,000 boat with 20% down

Price of the boat, motor and trailer: $45,000.00 · Cash down payment: $9,000.00 · Trade-in value: $0.00 · Sales tax rate: 6% · Documentation, title, registration and preparation: $600.00 · Loan APR: 8.5% · Loan term: 10 years (120 months) · Extra principal a month: $0.00

Monthly boat payment

$487.26

$39,300 financed over 10 years at 8.5%, with $19,171.65 of interest.

Amount financed: $39,300 · Sales tax: $2,700.00 · Total interest: $19,171.65 · Last payment: Oct 2036

Ten years at 8.5%. The term table above shows what the same boat costs at 5 years and at 20.

The same boat over five years instead of ten

Price of the boat, motor and trailer: $45,000.00 · Cash down payment: $9,000.00 · Trade-in value: $0.00 · Sales tax rate: 6% · Documentation, title, registration and preparation: $600.00 · Loan APR: 8.5% · Loan term: 5 years (60 months) · Extra principal a month: $0.00

Monthly boat payment

$806.30

$39,300 financed over 5 years at 8.5%, with $9,077.98 of interest.

Amount financed: $39,300 · Sales tax: $2,700.00 · Total interest: $9,077.98 · Last payment: Oct 2031

The payment is much larger and the interest is a fraction of the ten-year figure. That trade is the whole decision.

A trade-in worth $8,000, plus $250 a month extra

Price of the boat, motor and trailer: $45,000.00 · Cash down payment: $9,000.00 · Trade-in value: $8,000.00 · Sales tax rate: 6% · Documentation, title, registration and preparation: $600.00 · Loan APR: 8.5% · Loan term: 10 years (120 months) · Extra principal a month: $250.00

Monthly boat payment

$382.12

$30,820 financed over 10 years at 8.5%, with $7,122.10 of interest.

Amount financed: $30,820 · Sales tax: $2,220.00 · Total interest: $7,122.10 · Last payment: Nov 2031

The trade-in is credited before tax, so it removes $480 of sales tax as well as $8,000 of principal — and $250 a month extra then takes years off the end.

A 20-year term on a smaller boat

Price of the boat, motor and trailer: $38,000.00 · Cash down payment: $7,600.00 · Trade-in value: $0.00 · Sales tax rate: 6% · Documentation, title, registration and preparation: $550.00 · Loan APR: 8.5% · Loan term: 20 years (240 months) · Extra principal a month: $0.00

Monthly boat payment

$288.38

$33,230 financed over 20 years at 8.5%, with $35,980.64 of interest.

Amount financed: $33,230 · Sales tax: $2,280.00 · Total interest: $35,980.64 · Last payment: Oct 2046

Twenty years is the longest term boat lenders commonly offer: the payment drops sharply while the total interest balloons. The term table above compares the same deal at five, ten and fifteen years.

Frequently asked questions

What is a typical boat loan term?

Lenders commonly offer 5, 10, 15 and 20 years, and the term you are allowed usually depends on how much you are borrowing and how old the boat is: the longest terms are reserved for larger loans and newer hulls. This page compares all four at your rate so the trade is visible. On a $39,300 balance at 8.5% the payment falls from about $806 a month at 5 years to about $341 at 20, while the total interest rises from roughly $9,100 to roughly $42,600.

Is sales tax charged on a boat in every state?

No, and the difference is bigger than most buyers expect. Some states charge sales tax on the purchase, some charge an annual excise or personal property tax on the value instead, some cap the tax, and some treat a federally documented vessel differently from a state-registered one. The trailer is often taxed and registered as a separate vehicle. Put in the tax that applies where you live, or ask the dealer for the out-the-door figure and work backwards from it.

Does a trade-in really reduce the tax?

In most states, yes: tax is charged on the price less the trade-in, so the trade-in removes both its own value and the tax on it. On a $45,000 boat with an $8,000 trade-in at 6%, that is $480 of tax that is never charged, on top of the $8,000. A few states charge tax on the full price regardless of a trade-in, which is why this page prints a taxable amount rather than assuming.

Should I take the longest term to keep the payment low?

Only if you expect to keep the boat, or if you will pay extra afterwards. A 20-year loan on a boat you sell in 6 years usually leaves a balance above the resale value, and the difference has to be paid at the sale. The amortization table is the honest test: look at the balance at the end of each year and compare it with what a boat of that age actually sells for.

Is it better to pay a little extra every month or one bigger payment a year?

Every month, on a simple-interest loan. Interest is charged on the balance as it stands each month, so money paid earlier saves more of it. This page models a monthly extra amount; a single annual payment behaves the same way but saves less, because the months before it still charge interest on money that will later be paid.

Why is dealer financing often more expensive than my bank?

A dealer arranges the loan and is usually paid for arranging it, and that payment can be built into the rate rather than quoted separately. That does not make dealer financing always worse — some manufacturers subsidize rates — but it does mean the APR is the number to compare, not the monthly payment. Get a rate from a bank or credit union before you go, and be careful of negotiating on the payment alone: a longer term hides a higher rate.

Does this page include insurance, mooring or maintenance?

No, and those costs are usually larger than buyers expect: hull insurance, a slip or dry stack, winterizing, bottom paint, engine service, fuel and registration continue whether the boat is used or not. They are running costs rather than loan costs, so they are not part of the payment — but a boat whose payment you can only just afford is usually a boat you cannot afford, because the fixed costs arrive in the same month as the payment.

Do you hold on to the loan amount and the rate I enter?

Neither the price, the tax nor the rate leaves your machine: the whole loan calculation runs in the browser tab and no request is made of any server, so there is nothing for the site to keep and no upload endpoint that could receive it. An automated release check blocks any calculator page that opens a network connection, which is the mechanism that keeps the arithmetic local.

Assumptions and sources

  • The payment and the schedule come from the standard annuity payment P × r ÷ (1 − (1 + r)^−n) applied to the financed amount, with interest charged on the outstanding balance each month. It is the same amortization calculation that drives the auto, personal and mortgage calculators on this site, so the tables agree with each other.
  • Sales tax, title, registration and any excise tax on a boat are set by the state, so this page takes one tax rate and one fee figure as inputs rather than printing a national figure. Your state’s motor vehicle or revenue office publishes the rate; the dealer’s out-the-door figure is what to check it against.
  • Rates and terms: this page prints none. Boat lenders price on the hull, the age of the boat and their own programs, and the APR you are quoted is the only one that applies to you.
  • Not modelled here: hull insurance, lien fees, mooring or dry-stack fees, winterizing, maintenance, fuel, trailer registration, state excise taxes and any prepayment penalty.

Last reviewed 2026-09-20. An estimate, not financial advice; your lender's Loan Estimate overrides it. Read the full disclaimer.

Where a figure on this page comes from an official agency — HUD, IRS, FICO or a state body — the site keeps a dated snapshot of the source page in its sources library, and a scheduled job re-checks that snapshot, so the number can be traced back to the document it came from.

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