HMRC tax adviser registration: What your firm must do before 18 August 2026

<p><i>Published Wednesday 10 June 2026</i></p><h2>Table of contents</h2><ul><li><a href="#what-is-hmrcs-mandatory-tax-adviser-registration">What is HMRC's mandatory tax adviser registration?</a></li><li><a href="#who-needs-to-register-as-a-tax-adviser">Who needs to register as a tax adviser?</a></li><li><a href="#who-doesnt-need-to-register">Who doesn't need to register?</a></li><li><a href="#when-does-your-practice-need-to-register">When does your practice need to register?</a></li><li><a href="#what-conditions-must-your-practice-meet">What conditions must your practice meet?</a></li><li><a href="#how-to-prepare-your-firm-for-registration">How to prepare your firm for registration</a></li><li><a href="#what-happens-if-your-firm-doesnt-register">What happens if your firm doesn't register?</a></li><li><a href="#simplify-your-practice-compliance-with-xero">Simplify your practice compliance with Xero</a></li><li><a href="#faqs-on-hmrc-tax-adviser-registration">FAQs on HMRC tax adviser registration</a></li></ul><h2>Key takeaways</h2><ul><li>From 18 May 2026, HMRC requires all practices that handle clients' tax affairs to register as tax advisers. You do this by setting up an Agent Services Account (ASA).</li><li>Registration covers your whole practice. Individual team members don't need to sign up, but your practice and up to five relevant individuals must meet conditions set by HMRC.</li><li>If you already have an Agent Services Account, you don't need to register again. HMRC will request more information from you at a later date.</li><li>Practices that fail to register could face sanctions, including suspension and financial penalties, and won't be authorised to handle tax affairs on clients' behalf.</li></ul><h2>What is HMRC's mandatory tax adviser registration?</h2><p>HMRC tax adviser registration is a mandatory requirement for any practice that handles clients' tax affairs with HMRC in exchange for payment. Introduced through <a href="https://www.legislation.gov.uk/ukpga/2026/11/part/7">Part 7 of the Finance Act 2026</a>, it requires practices to meet minimum professional standards and register through an Agent Services Account (ASA). Registration opens on 18 May 2026, with most practices required to register within three months of that date.</p><p>The scheme is part of a wider government effort to raise standards across the tax advice market, close the tax gap, and protect taxpayers. The government is <a href="https://www.gov.uk/government/publications/mandatory-tax-adviser-registration-with-hmrc/tax-advisers-to-register-with-hmrc-and-meet-minimum-standards">investing £36 million</a> to modernise HMRC's registration services and enforce the new framework.</p><p>To continue handling client taxes on their behalf, your practice must meet certain conditions and complete the registration. You can register by <a href="https://www.gov.uk/guidance/apply-for-an-agent-services-account">applying for an Agent Services Account</a> using the new online service.</p><p>If you already have an HMRC Agent Services Account, which will be true for practices filing <a href="https://www.xero.com/uk/programme/making-tax-digital/prepare-clients-and-practice-for-mtd-it/">Making Tax Digital (MTD)</a> returns on behalf of clients, you don't need to sign up again. HMRC will contact you for additional information.</p><h2>Who needs to register as a tax adviser?</h2><p>You may still need to register as a tax adviser with HMRC, even if it's a term you wouldn't use to describe yourself or your practice.</p><p>If you interact with HMRC as part of <a href="https://www.xero.com/uk/guides/self-employed-tax/paying-tax-to-hmrc/">handling someone else's tax affairs</a>, and get paid for it, you're considered a tax adviser by HMRC. This means you need to complete the mandatory tax adviser registration.</p><p>Interacting with HMRC covers a wide range of activities. It includes:</p><ul><li>filing tax returns, claims, or elections on behalf of clients</li><li>phoning HMRC about a client's tax affairs</li><li>emailing or writing to HMRC on a client's behalf</li><li>sending messages through HMRC's online services</li><li>accessing HMRC systems to view or manage a client's tax records</li></ul><p>A tax adviser registration covers your whole practice. You don't need to register individual team members. If you're a sole trader, or tax services aren't the main function of your business, or you only work with a single client, you still need to register.</p><h2>Who doesn't need to register?</h2><p>Most practices will need to complete HMRC tax adviser registration and set up an Agent Services Account. Examples of when you don't need to register include:</p><ul><li>You interact with HMRC only as an employer, for example running payroll for your own team or managing your own tax affairs.</li><li>You give free advice to family, friends, or via a charity.</li><li>You're required to interact with HMRC by law, for example as an insolvency practitioner or investment firm.</li><li>You're responding to an HMRC information request.</li><li>You're developing or providing accountancy software.</li><li>You interact with HMRC only in relation to group undertakings.</li><li>You're involved in appeals to courts or tribunals.</li></ul><p>HMRC guidance also confirms that those who only interact regarding customs or import value added tax (VAT), or are VAT representatives, do not need to register. You can see the full list of exceptions on <a href="https://www.gov.uk/guidance/check-if-and-when-you-need-to-register-as-a-tax-adviser-with-hmrc#how-to-register">HMRC's tax adviser guidance page</a>.</p><h2>When does your practice need to register?</h2><p>You need to register as a tax adviser with HMRC from 18 May 2026. You have three months from this date to register. In some circumstances, the deadlines are slightly later:</p><ul><li><b>18 August 2026</b> if you already have a Self Assessment or Corporation Tax account</li><li><b>18 November 2026</b> if you only provide payroll services for clients</li><li><b>31 December 2026</b> if you're a financial services organisation</li></ul><p>You can register from 18 May, even if your deadline is later. Getting your tax adviser registration done early ensures client services won't be disrupted.</p><p>HMRC has confirmed that practices that have submitted their application by the relevant deadline won't face sanctions while their registration is being processed. You can keep interacting with HMRC, sending returns, and communicating on behalf of clients during the three-month window and while your application is under review.</p><h2>What conditions must your practice meet?</h2><p>There are certain conditions your practice, including some of the people working in it, need to meet before you can register.</p><p>Up to five directors, partners, or equivalent role holders will need to meet the conditions. HMRC refers to these people as relevant individuals. If you have five or fewer role holders, all will be treated as relevant individuals. You may need to include additional people who don't hold specific roles to reach five in total.</p><p>If you have more than five people in these roles, select five based on who makes strategic and management decisions about your tax services.</p><p>Your practice must not:</p><ul><li>have outstanding tax returns or unpaid tax for your business, unless there's a payment plan in place</li><li>have a decision that HMRC is refusing to interact with you</li><li>have received an anti-avoidance sanction or stop notice</li><li>have relevant, unspent convictions for fraud or tax offences</li><li>be formally insolvent</li><li>be suspended or permanently banned from registering with HMRC</li></ul><p>You also need evidence that your practice is supervised for anti-money laundering. This evidence could be a digital copy of your supervision certificate, or email confirmation. The same conditions apply to your relevant individuals, except they do not need to provide anti-money laundering supervision evidence. Relevant individuals also must not be disqualified from acting as a director in the UK or abroad.</p><p>HMRC can continue checking that these conditions are met after registration, so you need to maintain compliance on an ongoing basis. Using <a href="https://www.xero.com/uk/accounting-software/tax/">tax software that connects directly to HMRC</a> can help your practice stay on top of filing obligations and reduce compliance risk.</p><h2>How to prepare your firm for registration</h2><p>Before you apply, it's worth confirming whether your practice needs to register and when. HMRC provides an <a href="https://www.gov.uk/guidance/check-if-and-when-you-need-to-register-as-a-tax-adviser-with-hmrc">interactive tool to check if and when you need to register</a> as a tax adviser.</p><p>If you're based in the UK, HMRC carries out checks to make sure you meet the conditions after your application is submitted. You don't need to provide separate evidence at the time of application. HMRC will request it when necessary.</p><p>If you're based overseas, or any of your relevant individuals are, you need to provide authorised evidence when you apply for an HMRC Agent Services Account. This authorised evidence must be notarised and translated into English. You need to continue using the <a href="https://www.gov.uk/guidance/apply-for-an-agent-services-account-if-you-are-not-based-in-the-uk">existing registration route</a> for overseas practices.</p><p>To register, you'll need your Government Gateway account details, your practice's Unique Taxpayer Reference (UTR), and company and VAT registration numbers. HMRC provides a full list of <a href="https://www.gov.uk/guidance/apply-for-an-agent-services-account">required information for registration online</a>. You can also review HMRC's <a href="https://www.gov.uk/hmrc-internal-manuals/mandatory-tax-adviser-registration">detailed conditions guidance</a> to confirm your practice meets the requirements.</p><h2>What happens if your firm doesn't register?</h2><p>If your practice doesn't complete the HMRC tax adviser registration process, or fails to meet the conditions, you won't be authorised to interact with HMRC on behalf of clients.</p><p>HMRC can take a range of <a href="https://www.gov.uk/guidance/what-happens-if-you-interact-with-hmrc-when-you-are-unregistered-or-suspended-as-a-tax-adviser">actions against practices</a> that don't register or meet the conditions. These include:</p><ul><li>suspension of your registration, preventing you from acting on clients' behalf</li><li>removal of your access to HMRC systems, including online services for agents</li><li>financial penalties for continued non-compliance</li><li>permanent exclusion from registering as a tax adviser in serious cases</li></ul><p>For your clients, the impact could mean missed filing deadlines, delayed refunds, and service disruptions that damage your practice's reputation.</p><p>Registration only takes a few steps and it's free. Practices can register now with a few business details.</p><h2>Simplify your practice compliance with Xero</h2><p>Being registered as a tax adviser and having an Agent Services Account is essential for practices filing returns and making claims on clients' behalf.</p><p>As well as HMRC registration, you also need the right software to complete and file returns compliantly. <a href="https://www.xero.com/uk/accountants-bookkeepers/">Xero accounting software</a> is Making Tax Digital-ready, works for non-MTD VAT and Self Assessment submissions too, and ensures a direct connection to HMRC. Xero also comes with features that save your practice time and help your clients meet compliance requirements and keep business running smoothly.</p><p><a href="https://www.xero.com/uk/partner-programme/">Join the partner programme</a></p><h2>FAQs on HMRC tax adviser registration</h2><p>Here are answers to frequently asked questions about the mandatory tax adviser registration process.</p><h3>What is a tax adviser under HMRC rules?</h3><p>Under the Finance Act 2026, a tax adviser is broadly defined. You don't need to provide tax advice directly. If your practice assists with any document HMRC relies on to determine a client's tax position, you're within scope, even if tax work is incidental to your main service, such as filing stamp duty land tax returns during conveyancing.</p><h3>Can overseas firms register with HMRC?</h3><p>Yes, but the process differs. Overseas practices cannot use the standard online registration and must apply through a <a href="https://www.gov.uk/guidance/apply-for-an-agent-services-account-if-you-are-not-based-in-the-uk">dedicated route</a>. HMRC may request additional checks on relevant individuals based outside the UK, and processing times may be longer than for UK-based applicants.</p><h3>Does registration cost anything?</h3><p>No. There's no charge to apply for or maintain an Agent Services Account. Your main costs are indirect, such as time spent gathering documentation and identifying your relevant individuals. Overseas practices may also face notarisation and translation fees.</p><h3>How long does HMRC take to approve registration?</h3><p>HMRC will provide an estimate of processing time once you've completed the registration. Your practice can continue to interact with HMRC and file on behalf of clients while your application is being processed.</p><h3>What if I already have an Agent Services Account?</h3><p>Your existing ASA remains valid, and you won't need to go through the full registration process. HMRC will contact you separately to collect additional information required under the new framework. This lighter-touch transition applies to all practices that already hold an ASA, including those registered for Making Tax Digital filing.</p>