Britain, Northern Ireland or Japan: the same used car from each, compared

What changed in 2021, in one paragraph

Until Brexit, a used car from Britain came into Ireland with VRT and nothing else. Since 1 January 2021 Great Britain is outside the EU customs territory, so a car bought there is an import like a car from Japan: customs duty unless a preferential rate applies, import VAT at 23% on the customs value plus duty, and then VRT and the NOx levy as before. Northern Ireland stayed inside the EU’s customs rules for goods under the Windsor Framework, so a car in use there crosses the border with VRT only.

That put Japan and Britain on the same tax footing for most cars, and it is why the Japanese route grew: the same customs bill, but the cars are cleaner, cheaper for some models, and priced in a currency that has fallen against the euro.

The three routes side by side

The rules, before any prices. VRT and the NOx levy are the same from every source, because they are charged at registration on the car, not on where it came from.

1. Japan: 0% duty on a Japanese-built car with the exporter’s Statement on Origin, 10% on anything else (a German Golf that lived in Osaka pays it); 23% VAT on the customs value plus duty; sea freight of four to six weeks and the Japan-side fees; a CO2 and NOx disclosure for Japan-only models.
2. Great Britain: 0% duty on a British-built car when the seller provides a statement of UK origin under the EU–UK agreement, 10% on anything else, including a Japanese-built car bought in Britain, because the EU–Japan rate needs the car consigned directly from Japan; 23% VAT on the customs value plus duty; a customs declaration; transport by ferry or transporter in days; the CO2 figure is usually on the V5C.
3. Northern Ireland: no duty and no VAT, provided the car was registered there before 1 January 2021, was first registered there, or was brought in from Britain with a customs declaration completed in Northern Ireland. Without that proof, Revenue treats it as a car from Britain. VRT and NOx as normal; transport is an afternoon.
4. From all three: VRT at the CO2 band on Revenue’s Irish valuation (or €200 at 30 years), the NOx levy on the certified figure or the default, the NCTS appointment within 7 days of arrival and registration within 30.

Origin is the whole customs question

Both preferential rates depend on where the car was built and on paperwork. A Japanese-built car is duty-free from Japan with the Statement on Origin and pays 10% from Britain, whatever its badge says. A British-built car, a Mini, a Jaguar, a Nissan from Sunderland, is duty-free from Britain if the seller can evidence UK origin and pays 10% from Japan unless it is over 30 and declared under heading 9705. A German-, Spanish- or Czech-built car pays 10% from either, which is most Golfs, Polos and A3s on both markets.

The evidence is the weak point on the British side. The EU–UK agreement asks for a statement on origin from the exporter, which a dealer can sometimes provide for a car with a known build plant and a private seller rarely can. Revenue’s own guidance says a 0% rate “may be claimed” where the car was manufactured in the UK and complies with the origin terms; plan on the 10% unless the seller confirms the statement in writing.

Returned-goods relief, for a car originally exported from the EU and brought back within three years by the same person, is real but rare for a used car. And heading 9705 works from Britain exactly as from Japan: an original car over 30, 0% duty, VAT still 23% for a car that will be driven.

Worked examples at today’s rates

The engine’s figures on 18 September 2026 at ¥178.75 and £0.86 to the euro, registered in December, with the placeholder transport costs (€500 door to door from Britain, €200 from Northern Ireland) and our fee included in every column. Prices are plausible asking prices on each market, not quotes. The break-even column is the price at which that route would match Japan.

1. 2018 Volkswagen Golf 1.0 TSI, German-built, 60,000 km, Irish value €16,000: Japan at ¥1,400,000 lands at €17,886; Britain at £9,500 lands at €19,937 (€1,183 of duty); Northern Ireland at £11,500 lands at €17,675. Britain matches Japan at £8,200, Northern Ireland at £11,600. The German car pays duty from both Japan and Britain, so the cheapest sticker wins.
2. 2019 Toyota Prius, Japanese-built, 60,000 km, Irish value €18,000: Japan at ¥1,300,000 lands at €15,527; Britain at £12,500 lands at €24,342 (€1,541 of duty on a car that is duty-free from Japan); Northern Ireland at £14,500 lands at €20,800. Britain would have to be under £7,000 and Northern Ireland under £10,000 to match. Japan wins by the width of the Irish Sea.
3. 2000 Rover Mini Cooper, British-built, 40,000 km, Irish value €20,000: Japan at ¥2,800,000 lands at €34,782 (10% duty, no heading 9705 until 2030); Britain at £14,000 with a UK-origin statement lands at €31,057; Northern Ireland at £15,000 lands at €27,803. Britain matches Japan at £16,500, Northern Ireland at £20,800. The British car wins on tax; the Japanese one is the unrusted, air-conditioned car, which is a different argument.
4. 2017 BMW 320d, German-built, 90,000 km, NOx 60 mg/km, Irish value €15,000: Japan at ¥1,500,000 lands at €18,866; Britain at £9,000 lands at €19,330; Northern Ireland at £10,500 lands at €16,688. Britain matches Japan at £8,700, Northern Ireland at £12,300. The diesel pays €650 of NOx levy from everywhere; the difference is the duty on both third-country routes.

When each route wins

Northern Ireland wins on tax whenever the car exists there at a sensible price and its history qualifies, because it is the only route with no duty and no VAT; the supply is small and the good cars go quickly. Britain wins on British-built cars with an origin statement, on cars where the CO2 figure is on the V5C and no disclosure is needed, and on time. Japan wins on Japanese-built cars, which pay duty from Britain and none from Japan, on condition and mileage, and increasingly on price for the hybrids Ireland buys most.

Where the car is German-built, the two third-country routes are taxed identically and the decision is the price, the condition and the four weeks at sea. The calculator’s comparison page prices all three from one set of inputs and shows the break-even for the columns you leave blank.

Practicalities that differ

From Britain: the V5C carries the CO2 figure and often the NOx figure, so the disclosure fee usually disappears; the seller notifies the DVLA of export; the customs declaration is lodged by a broker for about €100; the car arrives on a transporter or you drive it off the ferry. From Northern Ireland: bring the V5C showing the Northern Irish history or the customs declaration that got the car there, because that is what Revenue checks before it waives the duty and VAT. From Japan: the export certificate and its translation, the Statement on Origin, the disclosure where needed, and the four to six weeks.

The NCTS does not care which route the car took. Book within 7 days of arrival, register within 30, and bring the same folder of documents whichever flag was on the ferry.

1. Britain: V5C with CO2, seller’s origin statement if British-built, customs declaration by a broker, one to three weeks door to door
2. Northern Ireland: V5C with Northern Irish history or the NI customs declaration, no duty or VAT, days
3. Japan: export certificate and translation, Statement on Origin, disclosure where needed, eight to fourteen weeks to plates