Boat Loan Calculator

Q: How much does it cost to own a boat per year?

The industry '10% rule' says to budget about 10% of your boat's value annually for maintenance alone. Total annual ownership costs — including insurance (1-3% of hull value), marina slip ($2K-$12K), fuel, winterization, and registration — typically add up to 15-25% of the boat's value per year, before loan payments.

Q: What down payment do I need for a boat loan?

Most marine lenders require 10-20% down. A larger down payment (15-20%) typically gets you a better interest rate and lower monthly payments. For boats under $25,000, you may only qualify for an unsecured personal loan which may not require a down payment but carries higher rates.

Q: How long can I finance a boat?

Boat loan terms typically range from 10 to 20 years for secured marine loans. Boats over $100,000 may qualify for 20-year terms. Shorter terms (5-10 years) are common for smaller boats or unsecured loans. Longer terms mean lower monthly payments but significantly more total interest paid.

Calculate your monthly boat payment, check if your boat qualifies as a second home for the mortgage interest tax deduction, and see the true annual cost of boat ownership.

Calculate your monthly boat loan payment and compare terms

Boat price

New or used vessel purchase price

Down payment

Most marine lenders require 10-20%

Interest rate (APR)

2026 marine loan rates: 6.5-10% typical

Loan term

10-20 years standard for marine loans

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Try another scenario

How to Use This Calculator

Boat Payment tab

Enter your boat price, down payment percentage, and interest rate. The calculator shows your monthly payment, total interest, and total cost. Expand "More options" to change the loan term. A side-by-side term comparison (10 vs 15 vs 20 years) shows how term length affects your total interest paid.

Tax Deduction tab

Check whether your boat qualifies as a second home under IRC §163(h). The IRS requires three features: sleeping berth, cooking facility, and toilet. If it qualifies, the calculator shows your annual interest deduction and tax savings, factoring in the $750K combined mortgage limit.

Total Ownership Cost tab

See the true cost of boat ownership beyond the loan payment. Enter insurance, marina/storage, fuel, maintenance, winterization, and registration. The calculator shows your total annual and monthly ownership cost with a percentage breakdown of each expense category.

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The Formula

Boat loans use standard amortization, the same math as mortgages:

Monthly Payment = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1]

Where:
P = Loan amount (boat price − down payment)
r = Monthly interest rate (annual rate ÷ 12)
n = Total payments (term in years × 12)

Total Interest = (Monthly Payment × n) − P
Total Cost = Boat Price + Total Interest

For the tax deduction, your boat must qualify as a second home under IRC §163(h)(4). The deductible interest is limited by the $750,000 combined mortgage debt cap (primary home + boat). If your combined debt exceeds $750K, only a prorated portion of the boat interest is deductible.

The 10% maintenance rule is an industry guideline: budget approximately 10% of your boat's current value per year for maintenance, repairs, and unexpected issues. This includes bottom paint, engine service, electronics, and hull maintenance.

Example

Mike — buying a 28-foot cabin cruiser in Annapolis, MD

Mike earns $120K, files married jointly, has a $320K primary mortgage, and is buying a $75,000 used 28-foot cabin cruiser with berth, galley, and head. He puts 15% down and gets an 8.5% marine loan for 15 years. Maryland state tax: 5.75%.

Boat Payment tab

Boat price$75,000

Down payment (15%)$11,250

Loan amount$63,750

Monthly payment$627/mo

Total interest (15 yr)$49,110

If Mike chose a 10-year term, his payment would be $790/mo but he'd save $18,600 in total interest. At 20 years, he'd pay $553/mo but $69,000 in interest — nearly the price of the boat.

Tax Deduction tab

Qualifies as second home?YES

Combined mortgage debt$383,750

Under $750K limit?YES

Annual boat interest (yr 1)$5,419

Tax savings (22% bracket)$1,192/yr

Mike's boat interest is fully deductible because his combined mortgage debt ($383,750) is well under the $750K limit. At a 22% marginal rate, he saves about $1,192 per year in federal taxes.

Total Ownership Cost tab

Insurance$1,500/yr

Marina slip (Annapolis)$7,200/yr

Fuel$2,400/yr

Maintenance (10%)$7,500/yr

Winterization$1,200/yr

Registration$300/yr

Total ownership (no loan)$20,100/yr

+ Loan payments$7,524/yr

All-in annual cost$27,624/yr

Mike's $75K boat costs about $2,302 per month all-in — nearly 3.7x the loan payment alone. The marina slip and maintenance are the biggest expenses, which is typical for Chesapeake Bay boating.

FAQ

What are typical boat loan interest rates in 2026? ▼

Marine loan rates in 2026 typically range from 6.5% to 10% for qualified borrowers. Credit score is the biggest factor: scores of 800+ can see rates around 7–7.9%, while scores in the low 700s see 8–9%. Boat loans through credit unions and marine lenders (like Trident Funding or BoatUS) tend to offer better rates than bank personal loans. Rates also depend on loan amount, vessel age, and whether the loan is secured by the boat.

Can I deduct boat loan interest on my taxes? ▼

Yes, if your boat qualifies as a second home under IRC §163(h)(4). The IRS requires three features: a sleeping berth (bed or bunk), cooking facility (galley with stove or microwave), and toilet (head). You must itemize deductions on Schedule A, and your combined mortgage debt (primary home + boat) cannot exceed $750,000 under the TCJA limit extended by OBBBA. If you don’t receive Form 1098 from your boat lender, report the interest on Schedule A line 11.

How much does it really cost to own a boat per year? ▼

The industry “10% rule” says to budget about 10% of your boat’s value annually for maintenance alone. Total annual ownership costs — including insurance (1–3% of hull value), marina slip ($2K–$12K depending on region), fuel, winterization, and registration — typically add up to 15–25% of the boat’s value per year, before loan payments. A $75K boat commonly costs $15K–$20K per year to own and maintain.

What down payment do I need for a boat loan? ▼

Most marine lenders require 10–20% down for a secured boat loan. Putting 15–20% down typically gets you the best rates. For boats under $25,000, you may only qualify for an unsecured personal loan (no collateral), which doesn’t require a down payment but carries higher interest rates (often 10%+). Some credit unions offer boat loans with as little as 10% down for members with excellent credit.

How long can I finance a boat? ▼

Secured marine loan terms range from 10 to 20 years. Boats over $100,000 commonly qualify for 15–20 year terms. Smaller boats or unsecured loans are typically limited to 5–10 years. Longer terms reduce your monthly payment but increase total interest significantly. For example, a $63,750 loan at 8.5% costs $49,110 in interest over 15 years versus $72,600 over 20 years — $23,490 more for the longer term.

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