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StreetOwl · The economics of…

The economics of… Running an older car vs buying new

Edition 4 · 3 October 2026 · figures dated below · next review 2027-01-01

A worked look at vehicle tax, MOT and Clean Air Zone charges for keeping an older car versus buying new in 2026/27, for low- and high-mileage drivers, with and without a driveway.

The one thing this turns on
Three costs are fixed by law rather than by the car's condition: vehicle tax (VED), the MOT test, and – for some drivers – a Clean Air Zone charge. Fuel economy, repair bills and resale value also matter, but they vary so much by make, model and mileage that no single figure applies to every reader, so they're left as arithmetic for you to do with your own numbers rather than stated here.
What an older car costs you, by law
How much tax an older car pays depends entirely on when it was first registered. Cars registered on or after 1 April 2017 pay a flat standard rate of £200 a year. Cars registered between 2001 and 2017 are taxed by CO2 band: a very low-emission car in Band A (up to 100g/km) pays £0 a year, a mid-range Band E car (131–140g/km) pays £180 a year, and a high-emission Band M car (over 255g/km) pays £735 a year. Cars registered before March 2001 are taxed purely by engine size: £235 a year up to 1549cc, or £385 a year above that. Once a car passes its third birthday it also needs an annual MOT, which costs up to £54.85 for a car.
What a new car costs you, by law
A new petrol or diesel car pays the flat £200 standard rate from its second year (the first year's rate depends on emissions and isn't covered here), and doesn't need an MOT until its third anniversary of registration, saving up to three years of test fees. If the car's list price when new was over £40,000, an extra £425 a year 'expensive car supplement' applies on top of the standard rate, in years two to six.
The cost that can dwarf the rest: Clean Air Zones
Several English cities charge non-compliant vehicles to drive in a Clean Air Zone. In Bristol's zone, for example, a non-compliant car is charged £9 a day. On a five-day commute that's £45 a week before any fuel is bought, and it applies however new or old the car is on paper – what matters is whether its engine meets the required emissions standard. For someone who drives into a zone regularly, this single charge can outweigh several years' difference in vehicle tax between an old car and a new one.
Four households, same arithmetic
HouseholdCarAnnual VEDMOTOther fixed cost
City renter, no driveway, low mileage, commutes into a Clean Air Zone2013 diesel, Band E (140g/km), non-compliant£180£54.85£9/day in the zone, days driven
Rural owner, driveway, high mileage (around 15,000 miles a year)2019 petrol, post-2017 standard rate£200£54.85None – no zone, so tax/MOT gap versus a new car is only about £55 a year
Suburban owner, driveway, average mileage2000 petrol, 1.8 litre (pre-2001, over 1549cc)£385£54.85None, but tax alone is about £240 a year more than a new car's £200
Low-mileage retiree, no driveway, on-street parking2016 small petrol, Band A (under 100g/km)£0£54.85None – keeping it is unambiguously cheaper on tax than any new car
Where the break-even sits
On tax and MOT alone, an older car can cost anywhere from £54.85 a year (a low-emission Band A car with no VED at all) to over £800 a year (a large pre-2001 engine, or a high CO2 band, plus the MOT), against a flat £200 a year for anything bought new. For most households that's a gap of a few hundred pounds a year at most – it rarely covers the cost of buying a replacement. The two things that can swing the sum hard are: which tax band the old car happens to sit in, and whether your journeys take you into a Clean Air Zone, where the daily charge for a non-compliant car can add up faster than a year's extra vehicle tax. Average annual mileage for cars in Great Britain is around 7,100 miles; the lower your mileage, the more these flat yearly charges dominate the comparison, and the less any difference in fuel economy between an old and new car matters in cash terms. At current UK average pump prices of around 134.2p a litre for petrol and 141.9p a litre for diesel, it's worth doing that fuel sum with your own car's actual miles-per-gallon figures rather than a generic one, since this varies more between individual cars than tax or MOT costs do.
Very old cars: the 40-year exemption
Cars built before 1 January 1986 are currently exempt from vehicle tax altogether, under a rolling rule that exempts vehicles over 40 years old. The same age threshold also exempts them from needing an MOT, provided the vehicle hasn't been substantially modified. This cut-off date moves forward by a year every 1 January, so a car that's liable for tax and MOT this year may become exempt from both within a year or two.
What this doesn't cover
This page covers only vehicle tax, MOT fees and Clean Air Zone charges. It doesn't cover insurance (which depends heavily on the driver, postcode and car), the cost of financing a purchase, the loss in resale value of a new car, or servicing and repair costs, which tend to rise with age but vary enormously by make and model. None of these is quantified here because no single figure would be honest for every reader's car.

Sources

Michael Rossi Founder, StreetOwl · Edition 4, 3 October 2026
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