Why car specification matters more than you think when importing from Japan

Choosing the right car isn't just about finding the right make, model or budget. When importing from Japan, the exact specification can dramatically influence what you'll pay by the time the vehicle reaches Ireland. Two cars that appear almost identical may have completely different VRT calculations, running costs and long-term value, because of differences in fuel type, emissions or hybrid technology. 

In this guide, we'll use a real Mercedes-Benz GLC example to demonstrate why researching the finer details before buying is so important. The lesson isn't about Mercedes. It's about understanding how a little knowledge and patience can save thousands of euro, regardless of which vehicle you're planning to import.

Why the details matter more than the badge 

Walk through any dealership or browse an online marketplace and you'll notice a familiar pattern.

Most buyers begin by choosing a make and model.

Toyota RAV4.

Mercedes-Benz GLC.

BMW 3 Series.

Lexus RX.

Once they've settled on the badge, they usually start comparing registration year, mileage, colour and asking price.

It feels like a logical way to buy a car.

The problem is that two vehicles carrying the same badge can be remarkably different beneath the surface.

Different engines.

Different drivetrains.

Different emissions.

Different trim levels.

Different technology.

Different market values.

And when you're importing from Japan, those differences influence far more than how the car drives. They can affect your Vehicle Registration Tax (VRT), running costs, fuel economy, resale value and, ultimately, how much value your budget actually buys.

This is one of the reasons many buyers become frustrated after importing a car. They found what appeared to be a great deal, only to discover later that another version of exactly the same model would have cost less to import, been cheaper to own or held its value better over time.

The badge didn't make the difference.

The specification did.

Understanding those details doesn't require years of experience or specialist knowledge. It requires asking a few better questions before committing to a purchase.

What engine does it have?

Is it petrol, diesel, hybrid or plug-in hybrid?

What are its CO₂ and NOx emissions?

How will Revenue calculate the VRT?

How does that affect the overall cost of importing the vehicle?

These are the questions that often separate a good purchase from a great one.

Throughout this guide, we'll use a real Mercedes-Benz GLC case study to demonstrate how four vehicles that appear remarkably similar can produce dramatically different import costs. More importantly, you'll see why the same principle applies whether you're considering a Toyota, Honda, Nissan, Lexus, Mercedes-Benz or almost any other vehicle available in Japan.

Throughout JDM Direct Ireland you'll notice the same principle appearing again and again. Whether you're calculating the real cost of importing a car from Japan to Ireland or learning about the hidden costs that catch many buyers by surprise, the strongest purchasing decisions are rarely made by looking at a registration plate or a price tag alone.

They're made by understanding the details that most people overlook.

Because when you're spending €20,000, €50,000, €80,000 or more, on a vehicle, knowledge isn't useful.

It's one of the best investments you can make.

What actually determines the cost of importing a car? 

Many buyers assume the total cost of importing a vehicle is largely determined by its purchase price.

In reality, that's only one piece of a much larger picture.

The purchase price is where the calculation begins.

By the time a vehicle arrives in Ireland, the final amount you've invested will have been influenced by shipping, insurance, taxes, Vehicle Registration Tax (VRT), registration costs and, perhaps most importantly, the vehicle's exact specification.

Some of those costs are predictable.

Others depend entirely on the version of the vehicle you've chosen.

That's why two cars advertised at almost exactly the same price in Japan can end up costing very different amounts to put on Irish roads.

Many buyers believe that once they've chosen a make and model, they've already answered the important questions.

In reality, choosing a Toyota RAV4, Mercedes-Benz GLC, BMW 3 Series or Lexus RX is only the starting point.

The version you choose can have a significant impact on your total investment.

Fuel type is one of the biggest factors.

A petrol model, a diesel model and a plug-in hybrid version of the same vehicle may all share the same badge, yet produce completely different VRT calculations because their emissions and taxation bands differ.

Engine output can matter.

Hybrid technology can matter. 

Even details such as CO₂ emissions, NOx emissions and the way Revenue values a particular variant influence the final figure you'll pay.

Many buyers don't discover this until they've already committed to purchasing a vehicle.

At that point, changing your mind may no longer be practical.

That's one of the reasons research should always come before choosing a specific car.

Understanding how Revenue assesses different specifications doesn't just help you estimate VRT more accurately. It also allows you to compare versions of the same model more intelligently, balancing purchase price against taxation, fuel economy, long-term ownership costs and future resale potential.

Sometimes the vehicle with the lower purchase price proves to be the more expensive choice.

Sometimes spending a little more on a different specification results in a lower overall landed cost and a better ownership experience.

That's why experienced buyers compare the complete package rather than focusing on a single headline figure.

Understanding how importing a car from Japan to Ireland works makes it much easier to see why specification plays such an important role. It's also one of the reasons importing from Japan instead of buying in Ireland can sometimes deliver significantly better value, and not because the purchase price is lower, but because choosing the right specification can improve both your ownership experience and the overall cost of importing.

The next section demonstrates exactly that using four remarkably similar Mercedes-Benz GLC 300 models. On paper they appear almost identical. In reality, the numbers tell a very different story.

The specifications buyers often overlook 

Most believe they're comparing cars but in reality, they're often comparing badges.

A Mercedes GLC 300 is a Mercedes GLC 300. A Toyota RAV4 Hybrid is a Toyota RAV4 Hybrid. A BMW 320d is a BMW 320d.

At least, that's what the advert suggests but the reality is very different because manufacturers rarely build a single version of any vehicle. Over a production cycle, they may produce dozens of variations, each with different engines, drivetrains, emissions, equipment levels and technologies. Some differences are immediately visible. Others remain hidden until you begin researching the exact specification.

Those details can influence far more than the way the vehicle drives.

They can determine how much tax you'll pay, what the car costs to insure, how economical it is to run, how desirable it will be on the second-hand market and, ultimately, whether it represents good value for your budget.

One of the easiest mistakes is assuming that two vehicles carrying the same badge are effectively the same car. They're often not. For example, a buyer may spend weeks searching for a particular model, finally find one within budget and assume the difficult part is over.

The important questions often begin at that point. 

Is this the most efficient engine available? 

Was there a facelift that introduced meaningful improvements? 

Is this drivetrain known for better reliability? 

Does another version produce significantly lower emissions?

Would a plug-in hybrid reduce the overall import cost?

Will this specification appeal to future buyers if I decide to sell it in five years?

Those aren't enthusiast questions. They're ownership questions and the answers can influence your finances for years after the vehicle arrives in Ireland.

That's why we encourage buyers to stop asking, "Is this the right car?" and start asking, "Is this the right version of the right car?"

It's a subtle difference, but one that often separates an average purchase from an outstanding one.

Another overlooked detail is how different markets receive different specifications. Vehicles built for Japan frequently include equipment that wasn't offered, or was only available as expensive optional extras, in Ireland or elsewhere in Europe. That means comparing two cars purely by registration year or mileage rarely tells the whole story.

Understanding specification isn't about becoming a technical expert.

It's about recognising that every detail forms part of the overall ownership experience.

The more informed your decision is before you buy, the fewer surprises you'll encounter afterwards.

That's one of the reasons Japanese auction grades don't tell the whole story. They describe the condition of a vehicle at the time of inspection, but they don't explain whether you've chosen the strongest specification for your needs. Likewise, what really happens when you import a car from Japan involves far more than winning an auction and arranging shipping. The research you do before bidding is often the stage that has the greatest influence on the outcome.

The next section demonstrates exactly why these details matter. Using four Mercedes-Benz GLC 300 models that appear remarkably similar on paper, we'll show how choosing a different specification can change the total cost of importing by well over €15,000.

Comparing four Mercedes GLC 300 models side by side 

Let's put theory aside for a moment and look at a real example.

While researching the Mercedes-Benz GLC for Irish buyers, we compared four 2021 GLC 300 AMG Line models using Revenue's VRT calculator.

At first glance, they appear remarkably similar.

Each is a GLC 300.

Each was first registered in 2021.

Each represents a premium SUV from the same generation.

Each would appeal to someone looking for a comfortable, practical family vehicle.

Most buyers would naturally expect their import costs to be broadly similar.

They aren't.

The difference between the lowest and highest VRT estimate wasn't a few hundred euro.

Reading those figures in isolation doesn't fully illustrate what has happened here.

Every vehicle wears the same Mercedes-Benz GLC 300 badge.

Every vehicle belongs to the same generation.

Every vehicle was first registered in 2021.

Yet the difference between the lowest and highest VRT estimate exceeds €14,600.

Nothing about these numbers is random.

Revenue isn't valuing one car more favourably than another.

It's applying the tax rules to four different specifications.

That's the lesson this article is really trying to teach.

The petrol plug-in hybrid produced the lowest VRT because of its low CO₂ emissions and modest NOx charge. 

The diesel model, on the other hand, combined higher CO₂ emissions with a substantial NOx liability, resulting in a VRT bill almost five times higher. 

Perhaps the most important lesson isn't that one version is automatically better than another. 

The four vehicles we compared were:

Each of these vehicles may suit a different owner depending on driving habits, annual mileage and personal priorities.

The lesson is that understanding the specification before buying allows you to compare vehicles based on their total cost of ownership, not their purchase price.

That's a very different way of looking at value.

A lower-mileage car isn't automatically the better purchase, just as two vehicles with the same badge aren't automatically the same car. Looking beyond the headline figures often leads to much better buying decisions.

In the next section, we'll look more closely at the individual figures used by Revenue and explain why values such as OMSP, depreciation, CO₂ and NOx matter far more than many buyers realise.

Why the VRT difference exceeded €15,000 

Looking at the four Revenue estimates, it's tempting to ask a simple question:

"How can four Mercedes GLC 300s produce VRT bills that differ by more than €15,000?"

The answer isn't hidden fees.

It isn't inconsistent calculations.

And it certainly isn't luck.

Revenue assessed four different vehicles.

Although they all carry the same GLC 300 badge, each version has its own emissions profile, statistical code, Open Market Selling Price (OMSP) and tax calculation.

The biggest factor is CO₂ emissions.

The petrol plug-in hybrid produces just 60 g/km, placing it in a much lower VRT band than the conventional petrol model at 200 g/km. Likewise, the diesel plug-in hybrid produces 49 g/km, compared with 174 g/km for the conventional diesel.

The second major difference is NOx.

Both diesel versions attract a €4,850 NOx charge, while the petrol and petrol plug-in hybrid are charged just €600. That single figure creates a gap of €4,250 before any CO₂-based VRT has even been considered.

Then comes Revenue's valuation.

Each vehicle has its own statistical code, original OMSP and current OMSP. Those values are not identical because the cars look alike. Revenue recognises that different powertrains and specifications have different market values, and the VRT calculation reflects that.

This is exactly why researching the specification before buying is so important.

Imagine finding two GLC 300s advertised in Japan for almost the same price.

Without understanding how VRT is calculated, it would be easy to assume they represent similar value.

They don't.

One could leave thousands of euro in your pocket that could instead be spent on a higher specification, lower mileage, better condition or even a newer vehicle.

That's the difference knowledge makes.

This principle extends far beyond the Mercedes-Benz GLC.

The same thought process applies when comparing a Toyota RAV4 Hybrid with another RAV4 Hybrid, two Lexus RX models, different versions of the Nissan Serena or even performance cars such as the Nissan Skyline GT-R. The badge tells you what the vehicle is. The specification tells you what it will cost to own.

Understanding this before buying is one of the simplest ways to make a smarter import decision. It's also one of the reasons how to avoid overpaying when importing a car from Japan has very little to do with negotiating auction prices. More often, it comes down to choosing the right specification in the first place. Likewise, common myths about importing cars from Japan often stem from buyers comparing vehicles that aren't actually comparable.

Perhaps the biggest lesson from these four Mercedes-Benz GLC 300s isn't that one version is better than another.

It's that no two specifications should ever be assumed to be the same because they share the same badge.

That's a lesson worth remembering before you bid on any vehicle.

Understanding Revenue's OMSP and depreciation 

VRT is not calculated from the price you paid for the vehicle in Japan.

Revenue instead works from the vehicle's Open Market Selling Price, usually shortened to OMSP. This is Revenue's estimate of the price the vehicle could reasonably be expected to achieve if sold in Ireland through the retail market, with Irish taxes and duties included. 

It can therefore be very different from the auction price, dealer price or invoice supplied by the Japanese seller. 

For a used vehicle, Revenue must also account for the fact that it is no longer new. Age, mileage, condition, specification and other market factors can influence the valuation. Revenue applies its valuation and depreciation system to arrive at a current OMSP, which then becomes the value used for the CO₂-related part of the VRT calculation. The applicable CO₂ percentage is multiplied by that current OMSP, before any separate NOx charge is added.

The four Mercedes-Benz GLC estimates demonstrate this clearly.

These figures reveal an important point: depreciation did not make the four cars equal.

All four estimates show the same A6 depreciation code and a 40% depreciation rate, but each version began with a different OMSP. Consequently, each retained a different current OMSP after depreciation was applied. The diesel plug-in hybrid, for example, still carried a current Revenue value more than €7,500 above the petrol model.

There is also a detail worth acknowledging in this comparison. Three estimates use an odometer entry of 50,000 kilometres, while the conventional petrol estimate records 50,000 miles. However, each document shows a mileage reduction of €0 and the same 40% depreciation rate. The examples remain useful for illustrating how Revenue treats different variants, but they should not be presented as a perfectly controlled scientific comparison.

For someone intending to keep the vehicle for years, the immediate concern is how the current OMSP affects the VRT bill. For someone thinking about resale, Revenue's valuation may also provide useful market context, but it should never be treated as a guaranteed selling price. An actual resale value will still depend on condition, mileage, specification, demand and the Irish market at that particular time.

The safest conclusion is straightforward: OMSP is not what you paid, depreciation is not a prediction of what you will lose, and current OMSP is not a promise of what the car will sell for. These are valuation inputs used by Revenue to calculate tax.

Revenue also states that calculator results are estimates only. The final amount may change if the vehicle details differ, if another emissions figure applies, if its OMSP changes or if legislation changes before registration. 

Petrol, diesel or plug-in hybrid. Which offers the best value?

After looking at the Revenue estimates, it would be easy to conclude that the petrol plug-in hybrid is the obvious winner.

It produced the lowest VRT.

The lowest NOx charge.

And one of the lowest Revenue valuations.

Based purely on registration costs, that's true.

However, buying a car should never be based on VRT alone.

The best value comes from choosing the version that suits the way you'll actually use it.

A plug-in hybrid, for example, delivers its greatest benefits when it's charged regularly and many journeys are completed using electric power. Drivers who have access to home charging and spend much of their time commuting locally are likely to benefit the most.

A conventional petrol model may suit someone who covers relatively modest annual mileage but doesn't have convenient access to charging infrastructure. Although its VRT is considerably higher in this example, ownership may still prove simpler depending on individual circumstances.

The diesel plug-in hybrid presents another interesting case.

Despite having one of the lowest CO₂ figures in this comparison, the additional NOx charge significantly increases its VRT. That doesn't necessarily make it a poor choice. Drivers covering long motorway distances every week may still appreciate the combination of strong fuel economy and long-range capability, provided the higher import costs fit comfortably within their budget.

The conventional diesel attracted the highest VRT of the four examples. That doesn't mean every diesel should automatically be avoided. It demonstrates how emissions, NOx charges and Revenue's valuation combine to influence the overall cost of importing a particular specification.

This is exactly why there isn't a universal "best" version.

There is only the version that best matches your priorities.

If your objective is to minimise the initial cost of importing, one specification may stand out.

If you regularly drive 35,000 kilometres a year, another version could make more financial sense over several years of ownership.

If resale value is your priority, you may weigh the decision differently again.

Looking only at the VRT estimate tells only part of the story.

The smarter approach is to consider the entire ownership experience.

• Purchase price.
• Import costs.
• Fuel consumption.
• Servicing.
• Insurance.
• Reliability.
• Annual mileage.
• Future resale potential.

When those factors are considered together, the strongest choice often becomes much clearer.

That's also why the biggest mistake buyers make when comparing cars is focusing on a single number instead of the complete ownership picture. Likewise, understanding What €50,000 actually gets you when importing a car from Japan often reveals that spending your budget differently (not necessarily spending more) can deliver a noticeably better vehicle.

The lesson from these four Mercedes-Benz GLC 300s isn't that one powertrain is objectively better than another.

It's that the right specification depends on the person buying it.

And that's exactly why taking the time to research before committing to a purchase is almost always rewarded.

What these figures really mean for buyers 

It's easy to look at the four Mercedes-Benz GLC 300 examples and focus solely on the difference in VRT. While the tax saving is significant, it isn't the most important lesson this comparison teaches.

The real takeaway is that the decisions made before buying a vehicle often have a greater financial impact than anything that happens afterwards.

Imagine two buyers with exactly the same budget searching for a premium SUV from Japan. They both find well-maintained examples with similar mileage, comparable specifications and almost identical purchase prices. On paper, there appears to be very little separating the two vehicles, making either one seem like a sensible purchase.

However, one buyer spends a little more time researching the available powertrains, understanding how Revenue calculates VRT and comparing the total cost of importing each version. The other chooses the vehicle that appears to represent the best value based on its purchase price alone.

When both vehicles arrive in Ireland, the difference becomes immediately apparent. One owner pays several thousand euro less in VRT, leaving more of their budget available for shipping, registration, insurance, servicing or even purchasing a higher specification vehicle in the first place. The saving wasn't created through negotiation or luck; it came from making a more informed decision before the vehicle was ever purchased.

This way of thinking applies to almost every vehicle imported from Japan. Whether you're considering a Toyota Land Cruiser, Lexus RX, Nissan Serena or Mercedes-Benz GLC, there are usually several versions available, each designed with a different purpose in mind. Some prioritise efficiency, others performance, while some focus on towing capability, refinement or luxury equipment. Looking only at the auction price rarely tells you which one represents the strongest value.

A better approach is to compare the complete ownership picture. Purchase price is only one part of the equation. Import costs, VRT, fuel consumption, servicing requirements, insurance, expected depreciation and future resale value all contribute to the amount a vehicle will actually cost over the years you own it.

Changing your mindset from "Which car is cheapest?" to "Which specification gives me the greatest value?" often leads to a very different buying decision. In many cases, spending a little more at the beginning results in a lower overall cost of ownership and a vehicle that better suits your needs for years to come.

That's also why understanding what do most Irish car buyers never discover about the Japanese market? helps explain why experienced import buyers often arrive at very different conclusions after researching the exact specification rather than comparing prices.

How knowledge can save you thousands 

The purpose of this article isn't to convince you to buy a Mercedes-Benz GLC, a plug-in hybrid or any other specific vehicle.

It's to demonstrate that the strongest buying decisions are usually made long before you place your first bid.

Research has a value.

Not because it helps you memorise technical specifications or understand every detail of the VRT system, but because it allows you to make decisions based on facts rather than assumptions.

The four Mercedes-Benz GLC examples illustrate this perfectly. A buyer who understands the differences between those specifications is unlikely to choose a vehicle based solely on its purchase price. Instead, they'll consider the complete financial picture, including VRT, running costs, fuel economy and long-term ownership. That's exactly how informed decisions are made.

The same principle applies whether you're spending €15,000 or €60,000. Every model sold in Japan has multiple specifications. 

Some were designed to minimise emissions, others to maximise performance, while some focus on comfort, efficiency or towing capability. 

This is where patience becomes an advantage rather than an inconvenience. 

Rushing into the first attractive listing often means accepting compromises you didn't even know existed. Spending a little longer researching the available specifications may reveal a better-equipped version, a more tax-efficient powertrain or a model that will cost considerably less to own over the coming years.

Knowledge also changes the questions you ask.

Instead of asking whether a vehicle is a good deal, you begin asking whether it's the right version, whether another specification would suit your needs better and whether the total cost of ownership justifies the purchase. Those are the questions that experienced import buyers ask before making a decision.

At JDM Direct Ireland, that's exactly what we hope every buyer takes away from our guides. Whether you choose to import the vehicle yourself or work with an importer is entirely your decision. 

Our aim is to help you understand the market well enough to make that decision with confidence.

If it were my money... 

If I were spending my own money, I wouldn't begin by searching for the cheapest Mercedes-Benz GLC or the one with the lowest mileage.

I'd begin by identifying which specification best suits the way I actually drive.

Once I'd narrowed that down, I'd compare examples based on condition, history, equipment and overall value rather than assuming every GLC 300 is effectively the same vehicle and the four examples in this guide demonstrate exactly why.

A different powertrain can change your VRT by well over €15,000, influence your long-term running costs and even affect how much of your budget remains for a better specification or lower-mileage example. That's too significant to ignore.

I'd also resist the temptation to rush. The Japanese market offers thousands of vehicles every week, and patience is often rewarded. Waiting a little longer for the right specification usually makes far more sense than compromising because a particular car is available today.

Most importantly, I'd remember that the objective isn't to import a car.

The objective is to import the right car.

They're not always the same thing.

A few extra hours spent understanding specifications, taxation and ownership costs before buying can save thousands of euro afterwards. In my view, that's one of the highest returns on investment any buyer can make.