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Self Assessment Tax Return in Portsmouth, England (2026)

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Cost

Free

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

Time at office

30 minutes

Estimated time

2-3 weeks

Quick summary

Complete guide to filing your annual income and expenses through the Self Assessment system in Portsmouth.

Required documents

  • National Insurance Number (NINo)

    Needed to identify yourself to HMRC.

  • Details of income and expenses

    Documentation that supports your income and tax deductions.

  • UK bank account

    For receiving any refunds or paying outstanding taxes.

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

: 2026

Step by step

  • 1

    Registration and creation of HMRC account

    Go to official site

    Create an account on the HMRC platform to access your personal space.

    !

    Expert tip

    "It is recommended to do this in advance to avoid delays."

  • 2

    Completing the income and expenses declaration

    Use the online form or download the PDF if you prefer to complete it manually.

    !

    Expert tip

    "Make sure to include all necessary details to avoid errors."

  • 3

    Sending the declaration and paying any outstanding tax

    Once reviewed, send your declaration through the online system.

    !

    Expert tip

    "If you owe money, make sure to pay it before the deadline to avoid penalties."

Offices and service points - Portsmouth

HM Revenue & Customs

Accessible City centre

Portsmouth Tax Office, 108-112 High Street, Portsmouth PO1 3NF

View on Google Maps
+44 (0)300 200 3300
Monday to Friday: 9:00 - 17:00

Frequently asked questions

When do I need to submit my declaration?
Generally, the deadline is January 31st of the following year for declared income.
What happens if I don't send my declaration on time?
You may face penalties and late payment charges. It's important to send it before the deadline.

Official sources and useful links

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