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Self Assessment Tax Declaration in London, England (2026)

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Cost

Free

The process is free, but there may be fines for delays or errors.

Time at office

30 min

Estimated time

2-3 weeks

Quick summary

Complete guide to filing your Self Assessment tax declaration in London. Immediate online process or visit HMRC offices.

Required documents

  • National Insurance Number (NINO)

    Needed to identify yourself with HMRC.

  • Financial details

    Income, expenses, and other relevant financial details for your tax declaration.

  • ?

    Supporting documentation Optional

    Invoices, receipts, and any other document that supports your income or deductions.

    ⚠️ Recommended to avoid errors

0 €
The process is free, but there may be fines for delays or errors. €0.00
€0.00
€0.00

: 2026

Step by step

  • 1

    Online Process (Recommended)

    Go to official site

    Access your account on the HMRC platform and complete the Self Assessment form.

    !

    Expert tip

    "This is the fastest and most convenient method for filing your declaration."

  • 2

    Tax payment

    If you have a tax debt, you can pay it directly from the online platform.

    !

    Expert tip

    "Make sure the payment is made before the deadline to avoid fines."

  • 3

    In-person process

    If you prefer to file in person, you can visit an HMRC office.

    !

    Expert tip

    "It's recommended to make a prior appointment before visiting the office."

Offices and service points - London

HM Revenue & Customs (HMRC) - London

Accessible Appointment required City centre

100 Parliament Street, London SW1A 2BQ

View on Google Maps
+44 300 200 3700
Monday to Friday: 8:00 - 18:00

Frequently asked questions

When should I file my declaration?
Generally, you should submit it by January 31st of the following year for the income you declare.
What happens if I don't do my Self Assessment?
You may face fines and penalties from HMRC. Additionally, you could lose your right to refunds or legal deductions.

Official sources and useful links

This guide is for informational purposes only. Always check the official source for current information.