What sources does Taxxa search?

Taxxa searches a continuously updated collection of more than one million pages from tax authorities, government publications, legislation and case law across the European jurisdictions it covers. Every response cites the underlying material, so a professional can inspect the rule, its jurisdiction and whether it is current before relying on the result.

Can Taxxa work with a team’s own documents?

Yes. Research can combine the public knowledge base with a team’s own PDF, DOCX, CSV and TXT files in one workspace. That makes it possible to compare a client document with the relevant guidance, trace a conclusion to its source and prepare a draft without losing the evidence that supports it.

Who is Taxxa built for?

Accountants, auditors, tax advisors, payroll specialists, bookkeepers and advisory teams working across European jurisdictions. Shared workspaces keep research available to colleagues, and citations make review easier.

Where is customer data stored, and is it used to train models?

Customer data stays in the European Union and is never used to train language models.

Does Taxxa replace professional judgement?

No. Taxxa is a research and drafting workspace. It helps professionals reach an informed starting point faster; the professional still reviews the evidence and makes the final decision. It does not file returns, post bookkeeping entries or give legal advice.

United KingdomGOV.UK

Petrol company cars over 2,000cc get a 27p September mileage rate

Larger diesel rates and the LPG rate above 2,000cc fall by 1p per mile from 1 September 2026; employers can continue using the previous rates for up to one month.

By Taxxa AI OyPublished 21 August 2026

Tax

Industry: Across industries

HMRC’s advisory fuel rates from 1 September 2026 increase the rate for petrol company cars above 2,000cc from 26p to 27p per mileGOV GOV. From September 2026, diesel cars with engines of 1,601–2,000cc have a rate of 16p per mileGOV. In June to August 2026 that diesel band had a rate of 17pGOV. The diesel rate above 2,000cc falls from 23p to 22pGOV GOV. The September LPG rate above 2,000cc is 20p per mile. For June to August 2026, the LPG rate in that band was 21p per mileGOV.

Petrol and LPG rates up to 2,000cc and diesel rates up to 1,600cc are unchanged. Petrol remains 14p per mile for engines up to 1,400ccGOV and 17p for 1,401–2,000ccGOV. LPG remains 11pGOV and 13p respectively for those same engine bandsGOV. Diesel engines up to 1,600cc continue at 15p per mileGOV. HMRC rounds the final advisory fuel rates to the nearest whole penny.

Fully electric company cars retain rates of 7p per mile for home charging and 15p for public chargingGOV. Where a journey involves both residential and public charging, employers can apportion mileage according to how much charging takes place at each location, using a fair and reasonable calculation. A higher rate can be used where the actual cost per mile is demonstrably higher. Hybrid cars continue to be treated as petrol or diesel cars for these ratesGOV.

The rates apply only to employees using company carsGOV. Their permitted uses are reimbursing business travel and calculating employee repayments for private fuelGOV. They must not be used for other circumstancesGOV. HMRC allows employers to continue using the previous rates for up to one month from the date the new rates applyGOV.

For business mileage reimbursement, HMRC says payments no higher than the appropriate engine-size and fuel-type rate create no taxable profit and no Class 1A National Insurance liabilityGOV. Employers can use rates reflecting their circumstances where cars are more efficient or business fuel costs are higher. If an employer pays more than the advisory rate without showing higher fuel costs, the excess is taxable profit and earnings for Class 1 National Insurance purposesGOV; payments solely for business journeys do not thereby create a private-fuel benefit chargeGOV.

The figures are HMRC’s advisory fuel rates, with the business-only car-fuel exception provided by section 151(3) of the Income Tax (Earnings and Pensions) Act 2003.

Update company-car fuel reimbursement and private-fuel recovery rates for the September schedule, allowing for HMRC’s one-month use of the previous rates.

Sources