Tinny vs Inflatable Boat: The True Cost of Ownership in Australia (2026)

Search "tinny for sale" and you will find a 3.7m aluminium hull for a few thousand dollars. It looks like the cheapest way onto the water in Australia. For a lot of people it is not, and the reason has nothing to do with the boat.

The purchase price of a tinny is the start of the bill. The trailer, the registration on two assets instead of one, the storage, and the ramp queue every Saturday are the parts nobody prices in until they are already paying them.

What you are actually comparing

The boat prices are close. Everything underneath them is not.

The five-year number

Here is a conservative five-year view for an owner who gets out roughly twice a month. Figures are indicative Australian retail ranges, not quotes.

Tinny

• Trailer: A$1,500–3,500 up front
• Trailer registration: A$150–300 per year — around A$1,000 over five years
• Trailer maintenance (bearings, tyres, lights, rust): A$150–400 per year
• Storage if you have no yard: A$40–80 per month — up to A$4,800 over five years
• Ramp parking and fees: small, but constant

Even with a free driveway and no paid storage, the trailer alone realistically adds A$3,000–6,000 across five years.

Inflatable catamaran

• No trailer, so no trailer purchase, rego, tyres, bearings or lights
• Stores deflated in a carry bag — a garage shelf or the boot of a mid-size SUV
• Launch wheels instead of a ramp: a one-off accessory, not an annual cost
• Hull warranty: 7 years on the Viper series, 5 years on the AeroCat series

Over five years the inflatable typically lands thousands of dollars ahead, before you count the weekends you did not spend queuing at a ramp.

The costs that never appear in a spreadsheet

Ramp dependency. A tinny goes where a ramp goes. An inflatable catamaran with launch wheels goes down a beach, off a riverbank, or off the sand at a spot with no infrastructure at all.

The two-person problem. Plenty of tinnies stay in the yard because reversing a trailer solo, in wind, at a busy ramp is not most people's idea of a Saturday. A catamaran that one person can carry, inflate and launch alone gets used far more often.

Corrosion and dents. Aluminium bruises on rocks and oyster-covered ramps, and saltwater finds every fastener. Heavy PVC tube fabric flexes off the same hits.

Trailer theft and rust. A trailer is a second asset sitting in your driveway that requires maintenance, insurance and attention.

Where the tinny still wins

Honest answer: it sometimes does.

• You want to leave it rigged, motor on, ready to hook up and go with zero setup.
• You tow long distances at highway speed and want the boat to live outside permanently.
• You are running big horsepower and long offshore legs where a heavier rigid hull suits the job.

If that is you, buy the tinny. If your real-world boating is bays, estuaries, rivers, beaches, headlands and half-day fishing trips, the maths flips hard the other way.

What our boats cost, plainly

AeroCat hulls use 1100 GSM / 0.9mm German VALMEX®. Viper hulls use 1500 GSM / 1.2mm VALMEX® Heavy Plus — the reason they carry a 7-year hull warranty. Premium VALMEX fabric has a working life of 10–12 years in Australian conditions.

Registration still applies

Do not skip this. An inflatable catamaran with a motor is a registrable vessel in every Australian state, exactly like a tinny. The difference is you register one thing instead of two. Check your state authority for the rules that apply to your length and propulsion.

The short version

A tinny is cheaper to buy and more expensive to own. An inflatable catamaran costs a little more on day one and then stops charging you: no trailer, no second rego, no storage bill, no ramp.

Built to last. Made to explore.