Top 7 Accounting Companies with Self-Assessment Tax Return Service in the UK

If you’re self-employed, a freelancer, a landlord, or someone with income outside of PAYE in the UK, you’ll be familiar with the importance of self-assessment tax returns. This annual process, overseen by HMRC, is essential for accurately reporting your income and calculating the amount of tax owed. Failing to file on time—or incorrectly—can lead to penalties, interest charges, or even a compliance check from HMRC.

The process, although necessary, can be daunting and time-consuming, especially for those unfamiliar with tax regulations. That’s where professional help becomes invaluable. Many people across the UK are now turning to specialist accounting firms to handle their self-assessment tax returns, ensuring peace of mind and complete accuracy.

In this article, we’ve rounded up seven of the top accounting companies in the UK that offer expert support in self-assessment filing. Whether you’re looking for affordable services, industry-specific expertise, or digital-first solutions, these firms can make your tax season stress-free.

1. Account Ease

Regarding efficient and affordable accounting services, Account Ease stands out as a top contender. With a strong focus on small businesses, sole traders, and contractors, they provide tailored support for self-assessment tax returns. The firm offers transparent pricing, often including fixed fees, so clients know exactly what to expect—no hidden charges.

Their team of certified accountants ensures that every form is filed correctly and on time. More importantly, they offer year-round advice, helping you stay tax-efficient well beyond January’s deadline. With responsive customer support and a deep understanding of HMRC regulations, Account Ease is a smart choice for individuals seeking professional tax help.

2. DNS Accountants

DNS Accountants is a nationally recognized firm offering specialized services for freelancers, landlords, and limited companies. Their self-assessment tax returns package includes everything from document preparation to submission via HMRC’s online portal. They also help clients identify allowable expenses to minimize tax liability legally.

What sets DNS apart is its cloud-based approach. Their accounting software allows users to upload income and expense records digitally, saving time and reducing the chances of manual error. With offices throughout the UK and a wide client base, they bring both scale and personalization to their services.

3. Crunch Accounting

Tech-savvy and tailored for freelancers and small businesses, Crunch Accounting provides an intuitive online platform backed by qualified accountants. Their self-assessment tax return service is seamlessly integrated into their monthly plans or offered as a standalone service.

Crunch is perfect for individuals who prefer digital convenience without compromising on expert advice. With features like real-time tax calculations and live chat support, it’s a favorite among younger professionals and remote workers.

4. TaxAssist Accountants

With over 400 locations across the UK, TaxAssist Accountants is a highly accessible and reputable name in the world of tax services. Their in-person consultations and local expertise make them ideal for individuals who prefer face-to-face guidance when dealing with self-assessment tax returns.

TaxAssist goes beyond basic compliance. Their accountants often advise on tax planning strategies, helping you retain more of your income. Whether you’re a sole trader or have complex income streams, they have the skills to manage your filings with precision.

5. Gorilla Accounting

If you’re a contractor or freelancer, Gorilla Accounting could be the perfect match. They specialize in niche sectors and offer tailored support for self-assessment tax returns. Their all-inclusive pricing model includes unlimited support and quick turnaround times, making them a reliable choice for busy professionals.

One of their key strengths is transparency—clients are assigned a dedicated accountant who ensures all deadlines are met and questions are answered promptly. Their client portal is also a great tool for managing tax documents on the go.

6. Mazuma

Mazuma offers a fully online accounting solution, making it ideal for people who prefer to manage finances digitally. Their monthly subscription model covers everything from bookkeeping to self-assessment tax returns, ensuring a holistic approach to your financial health.

What makes Mazuma unique is its focus on simplicity. Clients send in their paperwork monthly via email or post, and the team handles the rest. With a track record of accuracy and excellent customer satisfaction, Mazuma continues to be a go-to firm for micro-businesses and sole traders.

7. Brookson One

Catering primarily to contractors, Brookson One has been offering specialized tax services for over two decades. Their expertise in self-assessment tax returns makes them a trusted partner for thousands of clients in the UK.

Their all-in-one platform includes real-time financial dashboards, tax insights, and easy document uploads. Brookson’s proactive approach ensures clients don’t just meet tax deadlines—they also understand their overall financial position better, leading to smarter money decisions year-round.

Conclusion: Choose the Right Partner for Self-Assessment Tax Returns

Filing self-assessment tax returns doesn’t have to be stressful or confusing. Whether you’re looking for a hands-on advisor or a tech-based solution, there are plenty of reputable accounting companies in the UK ready to help you navigate the process with ease.

From industry leaders like TaxAssist, Account Ease UK, and Brookson One to digital-first firms like Mazuma and Crunch, each company on this list offers something unique. Choosing the right accountant, the right partner for self-assessment tax returns, comes down to your personal preferences, the complexity of your tax situation, and your budget. With the right support, tax season can be one less thing to worry about.

FAQs

1. Who needs to file a self-assessment tax return in the UK?
Anyone with income not taxed at source—like self-employed workers, landlords, or those with foreign income—must file a self-assessment tax return with HMRC.

2. What is the deadline for submitting a self-assessment tax return?
The deadline for online submissions is usually 31 January following the end of the tax year. Paper returns must be submitted by 31 October.

3. How much does it cost to hire an accountant for a self-assessment tax return?
Fees vary by firm and complexity but typically range from £100 to £400 for basic returns. Fixed-price packages are common among online and small business accountants.

4. Can I file my self-assessment tax return on my own?
Yes, HMRC offers an online portal for individuals to file independently. However, many choose accountants to avoid errors, maximize deductions, and save time.