June is a quieter month on the UK tax calendar compared to January or April — but a handful of changes landing this month are worth a five-minute check, especially if you run payroll, claim mileage, or are newly in scope for Making Tax Digital. Here's a practical rundown.
Four things on the radar this month: Corporation Tax payment deadlines for certain year-ends, updated HMRC advisory fuel rates, the start of MTD quarterly recording for sole traders and landlords, and HMRC's agent account security rollout.
The checklist
- Corporation Tax payment (1 June 2026): If your limited company has a 31 August 2025 year-end and profits under £1.5 million, your Corporation Tax payment was due nine months and one day after your year-end — 1 June 2026. If this applies to you and hasn't been paid, deal with it as a priority to limit interest.
- HMRC advisory fuel rates (from 1 June 2026): HMRC reviews advisory fuel rates quarterly (March, June, September, December). If you reimburse employees for business mileage in company cars, or operate fuel-only reimbursement, check you're using the current rates from 1 June. Using outdated rates risks under-reimbursing staff or creating an unexpected taxable benefit.
- MTD for Income Tax — first recording period underway: If you're a sole trader or landlord with gross income over £50,000 (based on your 2024/25 return), your first MTD quarterly recording period (6 April – 5 July 2026) is already running. Make sure digital records are being kept from day one — catching up later is harder than keeping pace now.
- HMRC agent account 2FA: If you use an accountant or bookkeeper, this is a behind-the-scenes change for them — but if you've recently changed agents or set up a new one, confirm their agent services account is properly configured so there's no disruption around your next filing.
- VAT returns on a standard quarterly cycle: If your VAT quarter ended 31 May, your return and payment are due by 7 July (one month and 7 days after period end). Worth flagging now so it doesn't creep up.
- Payroll — check tax codes and student loan thresholds: A good mid-year moment to spot-check that any tax code notices (P6/P9) received from HMRC have been actioned, and that no employees have crossed thresholds that change their National Insurance or student loan deduction category.
Small issues compound by year-end
None of the items above are individually dramatic — but a missed Corporation Tax payment accrues daily interest, outdated fuel rates create small payroll discrepancies that multiply across a tax year, and unrecorded MTD transactions become a much bigger job in week 12 than they would have been in week 1.
Looking ahead to July
Worth a quick mention: 31 July is the second Self Assessment payment on account deadline for those who make payments on account, and the next quarterly VAT deadline (for March quarter-end VAT registrants) falls on 7 July. If either applies to you, it's worth having these on your radar now rather than in three weeks.
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