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How to Deregister from Self-Assessment Tax?

Updated: Oct 14, 2023

Do you want to know how you can Deregister from a self-assessment tax, or perhaps you're planning to retire following a successful solo career? You'll be glad to know that telling HMRC about your changes of circumstances is an easy procedure. If you're ending or separating from the business partnership it is necessary to:

● Contact HM Revenue and Customs (HMRC) and then deregister from Self-assessment.

● Make sure to send your final tax return.

How to Deregister from Self-Assessment Tax

Understanding the Premise of Self-Assessment Deregistration

In the United Kingdom, self-assessment tax is a system HM Revenue and Customs (HMRC) uses to collect Income Tax. However, there might come a time when individuals or businesses no longer need to be in the self-assessment tax regime. This situation may arise due to a change in employment status, business structure, or personal circumstances. Deregistration from self-assessment tax is a critical step to ensure compliance with the UK's taxation laws.

Reasons for Deregistration

Various scenarios may trigger the need for deregistration from self-assessment tax. Some of these include:

  1. Ceasing Self-Employment: If you have been self-employed but have now taken up a full-time employment position, you may need to deregister from self-assessment tax.

  2. Business Restructuring: Transitioning from a sole trader to a limited company or any other significant structural change in your business may require deregistration.

  3. Income Threshold: Your income may have dropped below the threshold that requires self-assessment, making deregistration a sensible move.

It’s imperative to understand the specific circumstances surrounding your situation, as it could have a bearing on your tax obligations and the deregistration process.

Preliminary Considerations

Before embarking on the deregistration journey, there are some crucial considerations to bear in mind:

  • Tax Obligations: Ensure all your tax returns are up to date and all tax dues are settled. HMRC requires a clean slate before processing a deregistration request.

  • Informing HMRC: Timely communication with HMRC about any changes in your status is essential to avoid penalties and ensure a smooth transition out of the self-assessment tax system.

How to Inform HMRC That You Have Stopped Being Self-Employed?

There are several options to do it:

Call HMRC on 0300 200 3310

If you worked in the construction industry (CIS) contact 0300 200 3210

Fill out the online application

Mention it in your Self-Assessment tax return

You'll need:

● Your National insurance number.

● Your UTR number.

(Special Thanks to HMRC: We are adding this video link from HMRC on their Communications Director's offer to us to add this video to this post)

Delving into the Deregistration Process

The pathway to deregistering from self-assessment tax in the UK necessitates a structured approach. Adhering to the guidelines set forth by HMRC is pivotal to ensuring a hassle-free deregistration process.

Step-by-Step Deregistration

  1. Get Professional Advice: Consulting with a tax professional or accountant is advisable to understand the implications and the process of deregistration thoroughly.

  2. Check Eligibility: Ensure you meet the criteria for deregistration. Your circumstances should align with the reasons HMRC considers valid for exiting the self-assessment tax regime.

  3. Update Your Records: Make sure all your tax affairs are in order. This includes submitting any outstanding tax returns and paying any tax owed.

  4. Notify HMRC: Inform HMRC of your intention to deregister by filling out the appropriate form. For individuals, the form is SA1, while businesses may need to fill out form CWF1.

  5. Await Confirmation: Once HMRC receives your application, they will process it and send you a confirmation. This may take some time, so it's crucial to remain patient.

  6. Keep Records: Even after deregistration, it's essential to keep all previous tax records for at least 22 months following the end of the tax year they relate to.

Documentation Involved

A crucial part of the deregistration process involves the proper documentation. Here are the key documents you'll need:

  • Proof of Changed Circumstances: Documentation showcasing the change in your employment or business status.

  • Completed Deregistration Form: Either form SA1 or CWF1, filled out accurately.

  • Previous Tax Records: All past tax returns and relevant documents.

Post-Deregistration Compliance

Exiting the self-assessment tax system doesn't absolve you from your tax obligations. You'll still need to adhere to the tax rules applicable to your new status. For instance:

  • Pay Any Outstanding Tax: Ensure all due taxes are paid.

  • Adhere to New Tax Obligations: Understand and comply with the tax obligations associated with your new employment or business structure.

What is the Consequence If You Don’t Inform HMRC?

If you don't notify HMRC that you are deregistered from self-assessment tax (after you've ended your conducting business), HMRC will continue sending self-assessment tax returns. If you do not respond to these tax returns, you'll be subject to late tax penalties.

In addition, HMRC may create an estimated tax bill in the event that you do not file and complete the tax returns in time. These estimated debts are legally due and can only get displaced by sending in a tax return within three years of the filing date for the return.

What Happens After You Have Deregistered from Self-Assessment Tax?

When you have deregistered from self-assessment tax, what you have to do is:

● File your last tax return

● Make sure you have paid any income tax or National Insurance that you owe

● If you're VAT registered, cancel your VAT registration here.

● Keep your records (receipts invoices, receipts, etc.) for six years

What will HMRC do?

● They will not request you to fill out a Self-Assessment tax return next year (unless you have a reason to file one, obviously)

● They will also cancel your Class 2 National Insurance contributions

Send Your Final Tax Returns

If you are sending your final return You must:

● Determine your trade income

● Add up your allowable expenses

● Calculate your capital allowances

● Work out if you owe Capital Gains Tax on any assets sold or 'disposed of'.

● Calculate your final profit loss.

Get in touch with a Pro Tax Accountant to assist you with your tax return!

If your partnership is ending, the nominated partner should send a final Partnership Tax Return by the deadline.

Can I Claim Tax Relief on My Tax Return?

Yes, you are able to reduce the amount of tax you pay by using the following claim:

● Entrepreneurs' Relief

● Overlap relief

● Terminal loss relief

Another relief is to reduce the amount of Capital Gains Tax that you may be able to claim.

Keep in Mind

Based on the circumstances according to your case, you need to follow these steps:

VAT Registration

Be sure to unregister any VAT registrations if either you or your partner have registered.


Stop your PAYE scheme and submit final pay reports to HMRC when you stop employing staff.


You'll be responsible for the business obligations. Your creditors may bring you before a judge or declare you bankrupt in the event that you fail to pay. But, you may be able to locate an alternative option to pay

Construction Industry Scheme (CIS)

Contact the CIS assistance line immediately If you're registered, and wish to stop operating as a subcontractor.

Deregister from Self-Assessment Tax

What Happens After Deregistration?

When you stop self-assessment, HMRC will:

● Don't request a self-assessment tax return for the year following

● Refund all of class 2. National Insurance contributions.

Contrarily it is recommended that you:

● Keep track of your documents over the course of six years.

Addressing Potential Challenges

The road to deregistration from self-assessment tax in the UK may present some hurdles. Being cognizant of these challenges and prepared to tackle them can ease the process significantly.

Common Challenges and Their Solutions

  1. Misinterpretation of Eligibility:

    • Understanding the precise eligibility criteria for deregistration is crucial to avoid any setbacks.

    • Consultation with a tax advisor can clarify any ambiguities regarding eligibility.

  1. Delays in Processing:

    • The deregistration process might take longer than anticipated if there are discrepancies in your tax records or forms.

    • Ensuring all information provided to HMRC is accurate and complete can mitigate the risk of delays.

  1. Unsettled Tax Liabilities:

    • Any outstanding tax liabilities could hinder the deregistration process.

    • Promptly settling all tax dues can expedite the process.

Seeking Professional Assistance

Leveraging the expertise of tax professionals can be a game-changer in navigating the challenges that may arise during deregistration. They can provide tailored advice, ensure all documentation is correctly filled out, and liaise with HMRC on your behalf, making the process less daunting.

Staying Compliant Post-Deregistration

The task doesn’t end at deregistration; maintaining a compliant stance with the new tax obligations is of paramount importance to avoid any legal repercussions. Here's a roadmap to ensuring adherence to tax laws post-deregistration.

Understanding New Tax Obligations

Tax Code Adjustments:

  • Post deregistration, your tax code may change. It’s crucial to understand your new tax code and ensure it’s applied correctly to your income.

PAYE System:

  • If you’ve transitioned to full-time employment, you’ll now be part of the PAYE (Pay As You Earn) system. Familiarize yourself with how it operates to prevent any tax discrepancies.

VAT Obligations:

  • If your business structure has changed, your VAT (Value Added Tax) obligations might also have shifted. Ensure you’re compliant with the new VAT requirements.

Maintaining Accurate Records

  • Keeping precise and up-to-date records of all financial transactions is fundamental. This practice will not only keep you ready for any future tax inquiries but also provide a clear financial picture of your status.

Regular Check-ins with a Tax Advisor

  • Engaging in regular consultations with a tax advisor can provide insight into any new tax laws or obligations, ensuring you remain compliant and well-informed.

Utilizing Digital Tools

  • Employing digital tax software can streamline the process of managing your tax obligations, making it easier to stay compliant.

Educating Yourself

  • Stay informed about the UK tax system's evolving landscape by reading reputable tax guides, attending workshops, or participating in online tax forums.

By adhering to these guidelines, individuals and businesses can navigate the transition out of the self-assessment tax regime smoothly. This detailed guide aims to equip readers with the knowledge and resources necessary to manage this transition efficiently, ensuring compliance with the UK tax laws every step of the way. The path to deregistration, when navigated correctly, paves the way for a hassle-free financial future, allowing you to focus on your core activities with a clear tax conscience.

Enlisting Expertise: The Significance of Professional Help in Deregistering from Self-Assessment Tax in the UK

Enlisting Expertise: The Significance of Professional Help in Deregistering from Self-Assessment Tax in the UK

Embarking on the journey of deregistering from the self-assessment tax regime in the UK can often resemble navigating through a labyrinth. The complexity of tax laws and the rigorous compliance required by HM Revenue and Customs (HMRC) can make this process seem daunting. This is where the expertise of a tax accountant becomes invaluable. Here’s a closer look at why seeking professional help is a prudent choice when deregistering from self-assessment tax in the UK.

Clarification of Eligibility

Understanding Criteria:

  • The eligibility criteria for deregistering from self-assessment tax can be intricate. A tax accountant can elucidate these criteria, helping you understand whether you qualify for deregistration.

Personalized Assessment:

  • Every individual or business scenario is unique. Professional help provides a tailored assessment of your situation, ensuring a clear understanding of your eligibility.

Accurate and Timely Submission

Form Preparation:

  • Filling out the necessary deregistration forms accurately is crucial. A minor error can result in delays or even rejection. A tax accountant ensures that all forms are filled out correctly and submitted on time.

Meeting Deadlines:

  • HMRC has strict deadlines for tax submissions. Professional help ensures you meet these deadlines, avoiding any late submission penalties.

Mitigation of Compliance Risks

Understanding Tax Obligations:

  • A tax accountant can provide insight into all tax obligations, ensuring you remain compliant throughout the deregistration process.

Resolution of Outstanding Issues:

  • Any outstanding tax issues need resolution before deregistration. A tax accountant can help address these issues efficiently.

Liaison with HMRC

Effective Communication:

  • Having a professional liaison between you and HMRC can streamline the communication process, ensuring that all queries and requirements are addressed promptly.

Handling Discrepancies:

  • In case of any discrepancies in your tax records, a tax accountant can act swiftly to provide necessary clarifications or corrections to HMRC.

Post-Deregistration Compliance

Transitioning to New Tax Regime:

  • Post deregistration, your tax obligations may change. A tax accountant can guide you through this transition, ensuring you understand and comply with your new tax obligations.

Continuous Advisory:

  • A tax accountant can provide ongoing advisory services, keeping you updated on any changes in tax laws that might affect you.

Peace of Mind

Reducing Stress:

  • The process of deregistering from self-assessment tax can be stressful. Professional help alleviates this stress, allowing you to focus on other important aspects of your life or business.

Financial Savings:

  • While there's a cost associated with hiring a tax accountant, the financial savings from avoiding penalties and ensuring accurate tax submissions can outweigh the initial expense.

Long-Term Relationship

Building Trust:

  • Establishing a long-term relationship with a tax accountant can provide a trusted resource for all your tax-related concerns, now and in the future.

Strategic Financial Planning:

  • Beyond deregistration, a tax accountant can assist with strategic financial planning, helping you manage your finances efficiently.

In conclusion, the process of deregistering from self-assessment tax in the UK, while seemingly straightforward, is laden with nuances that require a discerning eye and adept knowledge. Enlisting the help of a tax accountant not only facilitates a smoother deregistration process but also fosters a foundation for enduring financial compliance and strategic planning. It's an investment that pays dividends through peace of mind, accurate tax compliance, and a conducive relationship with HMRC.

How can a Pro Tax Accountant Help You?

The self-assessment experts on our team can assist by:

● Filling out your Self-Assessment.

● Informing HMRC that you are not self-employed anymore.

● Inform HMRC that you aren't required to file your tax return for the year following.

Contact us today to discuss your needs for self-assessment.



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