Marine mechanic

Marine Mechanic Invoice Template (Free)

By ShowTheReceipts · Updated

Short answer

A marine mechanic's invoice needs the vessel identified (name, make, HIN or engine serial), the complaint, parts itemized, labor by the hour, and a dock-call or travel line for mobile work — plus terms saying payment is due on completion. Copy the template below, or use invoicing software that builds it from the quote and takes payment at the slip.

Essential line items on a marine mechanic invoice

A professional marine mechanic and boat engine repair invoice serves as an official marine service log, vessel warranty record, and proof of ABYC (American Boat and Yacht Council) compliance:

  • Marine Repair Business Header: Company name, logo, physical shop or mobile service barge address, phone, email, ABYC / Yamaha / Mercury Master Tech certification credentials, and marine liability insurance details ($1M+ policy).
  • Vessel & Engine Metadata: Customer name, vessel name (e.g. “Sea Breeze”), boat make/length (e.g. 2023 Boston Whaler 250 Outrage), 12-digit HIN (Hull Identification Number), engine serial numbers (Port & Starboard), and engine hour meter readings.
  • Marina Location & Dock-Call Mobilization Fee: Marina name, slip number, dock-call travel fee, or water-service barge mobilization surcharge.
  • 100-Hour / Annual Outboard & Inboard Service: Four-stroke engine oil change, marine oil filter, high-pressure fuel filter / VST filter replacement, lower unit gear Lube change, and spark plugs.
  • Cooling & Mechanical Systems: Water pump impeller replacement, thermostat test, raw water pump rebuild, heat exchanger descaling, or power trim/tilt hydraulic seal repair.
  • Corrosion Protection & Anodes: Replacement sacrificial zinc or aluminum anodes (transom plate, gearcase anode, trim tab anode).
  • Payment Terms & Slip Side Receipt: Due-upon-completion terms (Net 0) required prior to untying from slip.

Free Marine Mechanic Text Template

Copy and paste the template below to build professional mobile marine mechanic and boat repair invoices:

================================================================================
           MOBILE MARINE MECHANIC & BOAT REPAIR INVOICE
================================================================================
MARINE MECHANIC INFO:                      INVOICE & DOCK CALL DETAILS:
[Your Marine Service Company Name]         Invoice Number: MAR-2026-0814
[ABYC Master Tech Certification #]         Service Date: August 3, 2026
[Phone & Billing Email Address]            Payment Terms: Due Upon Completion (Net 0)

VESSEL & ENGINE METADATA:                  MARINA LOCATION & ENGINE HOURS:
Client Name: [Boat Owner Name]             Marina: Harbor Town Marina (Slip B-24)
Vessel: 2023 Boston Whaler 250 Outrage     Engine S/N: Yamaha F300 (S/N #6CE-104820)
HIN #: WBD25088K223                        Engine Hours: 248.5 Hours

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LINE ITEM DESCRIPTION & OEM PARTS                               AMOUNT
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1. Marina Mobile Dock-Call & Service Van Travel Charge         $145.00
2. Computer Diagnostic Scan (Yamaha YDS Diagnostic System)     $120.00
3. 100-Hour Outboard Service Kit (OEM Yamaha 4-Stroke 4.2L V6)  $210.00
   - Yamalube 20W-40 Marine Oil, Oil Filter, Primary Fuel Filter
4. Lower Unit Gear Lube Drain & Refill w/ New Drain Plug Washers $75.00
5. Water Pump Rubber Impeller Kit Replacement (OEM # 6CE-W0078) $185.00
6. Sacrificial Zinc Anode Kit Replacement (Transom & Gearcase)   $95.00
7. Marine Technician Labor (3.5 Hours @ $135.00/hr)             $472.50
   - Scope: Impeller Swap, Gear Lube Pressure Test, 4,000 RPM Sea Trial
8. Environmental Marine Oil & Hazardous Waste Disposal Fee       $24.50
--------------------------------------------------------------------------------
SUBTOTAL SERVICE CHARGES:                                      $1,327.00
State & Local Marine Parts Sales Tax:                           $35.80
--------------------------------------------------------------------------------
TOTAL AMOUNT DUE & PAYABLE AT DOCK SLIP:                       $1,362.80
--------------------------------------------------------------------------------

SEA TRIAL & WARRANTY NOTICE:
Sea trial performed at 4,000 RPM — cooling water pressure & charging verified.
90-Day Parts & Workmanship Warranty on All Installed Components.
Accepted Payment Methods: Credit/Debit Card (Dockside Reader), Cash, Check.
================================================================================

Marine pricing: 100-hour service vs. water pump impellers vs. dock calls

Marine engine labor reflects specialized tools and working on water:

  • 100-Hour / Annual Service Package ($350–$650 per engine): Standard annual service for Yamaha, Mercury, Suzuki, or Evinrude outboards. Includes crankcase oil, lower unit gear lube, spark plugs, fuel filters, and zinc anodes.
  • Water Pump Impeller Replacement ($280–$550 per engine): Rubber impellers deteriorate over time. Itemize impeller kits, wear plates, woodruff keys, and housing gaskets.
  • Dock-Call & Water Mobilization Fees ($125–$250 flat): Billing a dedicated dock-call fee covers van mileage, marina parking, carrying heavy tool totes down long gangways, or launching a service tender.

Itemizing HIN/Serial numbers and zinc anode corrosion protection

Documenting marine technical specifications protects your shop from warranty claims:

  1. Engine Serial Number Logging: Always print the 10-digit engine serial number on the invoice. Marine engine manufacturers require serial numbers to honor parts warranties and recall credits.
  2. Sacrificial Anodes ($80–$180): Replacing depleted zinc (saltwater) or aluminum (brackish/freshwater) anodes prevents electrolysis from destroying expensive lower unit aluminum castings.

Dockside card payment collection before untying

  • Engine Sea Trial Verification: Document operating water pressure (PSI), charging voltage (14.2V), and peak WOT (Wide Open Throttle) RPM on the invoice before handing back keys.
  • Dockside Credit Card Terminal: Process card payments or text-to-pay links on your phone right at the dock slip before packing your tool bags into the service van.

If you service boat hulls or interiors, explore our free boat detailing invoice template or check out our review of mobile marine mechanic invoicing app.

Frequently asked questions

Why put the engine serial on the invoice?

Because a warranty or repeat-repair question a year later starts with which engine you touched. The serial and hours turn a long conversation into a records lookup.

Should the dock call be its own line?

Yes. Getting to a boat is a real cost, and pricing it separately keeps your labor rate honest instead of inflated to cover travel you never named.

How do I invoice a job where the part came later?

Show the diagnostic visit and the repair visit as separate labor lines with the part itemized between them. The customer sees exactly what each trip covered and why there were two.

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