Choosing an accountant online means trusting someone you have never met with your tax return, your financial records, and your HMRC compliance. That is why reviews matter more here than in almost any other service.

We looked at the UK's most popular online accountancy firms, checked their Trustpilot ratings, verified their pricing from their public websites, and compared what each one actually offers. Every figure in this article is sourced and can be checked by you directly.

Here are five of the highest-rated online accountancy services for filing tax returns in the UK in 2026.

What to Look For Before Choosing an Online Accountant

Price matters. But it is not the only thing. When you are trusting someone with your Self Assessment return, here is what to check:

•          Trustpilot rating and review volume. A 5-star rating from 20 reviews tells you less than a 4.9 from 500. Look at the number of reviews, not just the score.

•          Transparent pricing. If you cannot see a clear price on the website before signing up, be cautious. Hidden fees are one of the most common complaints in accounting.

•          What is actually included. Some firms quote a low price for filing only. Others include accounts preparation, tax advice, and year-round support in the same fee. Compare scope, not just numbers.

•          MTD readiness. From April 2026, sole traders earning over £50,000 need to file quarterly under Making Tax Digital. Make sure your accountant supports this.

•          Communication. How do they communicate? Email, phone, video call? How fast do they respond? Read the reviews for patterns.

At a Glance: Ratings, Reviews, and Pricing

1. Taxez: 4.9 out of 5 on Trustpilot (500+ Reviews)

Taxez is a UK online accountancy firm with a 4.9 out of 5 rating on Trustpilot from over 500 verified reviews. The firm serves over 2,000 clients across the UK and operates on a fixed annual fee model with no monthly subscriptions.

Sole trader Business Packages start at £199 per year (for turnover under £1,000) and scale based on turnover. The full pricing breakdown is on their website.

What clients consistently highlight in their reviews is the combination of low pricing and high-quality personal service. Every client is allocated a Dedicated Chartered Accountant who handles their accounts, files their return, and provides unlimited tax advice by email throughout the year. There are no hourly charges and no hidden fees.

A few things that stand out from the reviews and their Key Information document:

•          No bookkeeping software required. Taxez can produce accounts directly from your bank transactions downloaded as a CSV file. No need to buy or learn accounting software.

•          Annual fee model. You are invoiced once, after your accounts are complete. No monthly payments, no upfront charges for returning clients.

•          Unlimited advice and support included in every package. Your Dedicated Chartered Accountant answers questions throughout the year at no extra cost.

•          Secure document portal for uploading records safely, with automatic deadline reminders.

•          MTD for Income Tax support for sole traders and landlords affected by the April 2026 changes.

•          Fees 75 to 90% lower than traditional accountancy firms, made possible by operating entirely online.

Reviewers frequently describe Taxez as 'great value,' 'responsive,' and 'stress-free.' Multiple reviews mention clients switching from high-street firms and paying a fraction of what they used to.

2. Crunch: 4.6 out of 5 on Trustpilot (1,500+ Reviews)

Crunch is an established online accountancy platform that has been operating since 2009. Their Trustpilot page shows a rating of 4.6 out of 5 from over 1,500 reviews.

Sole trader pricing starts at £25.50+VAT per month (approximately £306+VAT per year). Crunch combines its own accounting software with professional accountancy support.

For full details of what each Crunch plan includes, visit their pricing page.

3. Mazuma: 4.6 out of 5 on Trustpilot (1,200+ Reviews)

Mazuma has been supporting small businesses and sole traders since 2006. Their Trustpilot page shows a 4.6 out of 5 rating from over 1,200 reviews.

Sole trader packages start at £38+VAT per month (approximately £456+VAT per year). Mazuma offers multiple tiers depending on the level of accountant access and support you need.

For a full breakdown, visit their pricing page.

4. Sleek: 4.7 out of 5 on Trustpilot (500+ Reviews)

Sleek is a global accounting platform that serves over 450,000 businesses worldwide. Their UK service holds a 4.7 out of 5 rating on Trustpilot from over 500 reviews.

UK sole trader accounting starts at £60 per month (£720 per year). Their pricing includes a Xero licence alongside managed accountancy support.

For more details, visit the Sleek UK page.

5. Traditional High-Street Accountants

Local accountants remain a popular option. A straightforward sole trader return typically costs between £300 and £1,200 per year at a high-street firm in 2026, according to industry pricing data.

Trustpilot ratings for local firms vary widely. Some hold excellent ratings. Others have very few reviews, making it harder to judge quality before committing. The advantage of a local firm is face-to-face meetings. The trade-off is higher pricing, driven by the overhead of maintaining a physical office.

How These Options Compare on Value

All five options on this list are legitimate, well-reviewed accountancy services. The difference comes down to what you get for your money.

Taxez is the only firm on this list that charges an annual fee rather than a monthly subscription, does not require bookkeeping software, and allocates a Dedicated Chartered Accountant to every client at every price tier. At £199 per year for smaller sole traders, it is also the most affordable professional option listed.

Common Questions

Can I trust Trustpilot ratings?

Trustpilot is an independent review platform. Companies cannot pay to remove negative reviews. However, review volume matters. A 5-star rating from 10 reviews is less reliable than a 4.9 from 500. Always read a mix of recent positive and negative reviews to get a balanced picture.

Are online accountants as good as high-street ones?

Online accountants hold the same qualifications and regulatory obligations as high-street firms. The difference is the delivery model. For many sole traders, the combination of lower fees, faster communication by email, and digital document sharing makes online firms more practical than traditional ones.

What if I need MTD quarterly filing?

From April 2026, sole traders and landlords with qualifying income over £50,000 must file quarterly under Making Tax Digital. Ask your provider whether MTD support is included in your package or charged separately.

Read Taxez Reviews on Trustpilot  |  Get a Quote  |  View All Services

This article is published by Taxez, a trading name of Richard McIntosh Ltd (SC575928). Trustpilot ratings and review counts are sourced from each firm's public Trustpilot page as of June 2026 and may change. Competitor pricing is sourced from each firm's public website. We encourage readers to verify all figures directly. This article does not constitute financial or tax advice.