What is Montrogue Tax?

Montrogue Tax offers expert tax advisory services, helping you manage 100+ tax documents and access valuable insights through our client portal.

What is the HMRC Self Assessment deadline?

The Self Assessment online tax return deadline is 31 January following the end of the tax year, with the balancing payment also due on 31 January. Payments on account are due on 31 January and 31 July.

When is Corporation Tax due?

Corporation Tax is payable 9 months and 1 day after the end of your accounting period, and the Company Tax Return (CT600) must be filed within 12 months of the period end. Large companies pay in quarterly instalments.

What are the VAT deadlines?

VAT returns and payment are due one month and seven days after the end of each VAT quarter. Businesses on Making Tax Digital must submit returns using compatible software.

When do I need to register for MTD for ITSA?

Sole traders and landlords with qualifying income over £50,000 must register from 6 April 2026, over £30,000 from 6 April 2027, and over £20,000 from 6 April 2028. Below £20,000 registration is voluntary.

Back to Calculators

Tax Deadline Calendar

Never miss a tax deadline. Toggle between UK (HMRC) and International calendars to see the key filing and payment dates that apply to you across jurisdictions for the 2026/27 tax year.

Tax Deadline Calendar

Select the roles or jurisdictions that apply to you to see the key filing and payment deadlines for the 2026/27 tax year. Dates shown are indicative — always confirm against your own accounting period and local tax authority.

Sept

Sat

CISin 8 days

CIS monthly return — August

Submit CIS300 monthly return and account for deductions for August.

Approaching

Sept

Tue

PAYEin 11 days

Employer PAYE payment — August

Pay PAYE & NIC to HMRC electronically for August.

Approaching

Oct

Wed

VATin 26 days

VAT return deadline (Jul–Sep quarter)

Submit VAT return and pay HMRC for quarter ending 30 September.

Approaching

Oct

Wed

QIPsin 33 days

QIPs — 2nd instalment (31 Mar year end)

Second quarterly Corporation Tax instalment for large companies (3 months after the first).

Oct

Mon

PSAin 38 days

PSA settlement payment deadline

Pay the PAYE Settlement Agreement tax and Class 1B NIC for the prior tax year.

Oct

Mon

CISin 38 days

CIS monthly return — September

Submit CIS300 monthly return and account for deductions for September.