Are you worried about missing HMRC deadlines because of slow tax return processing? Discover how quickly UK accountants can file your tax return, whether you’re a sole trader, landlord, or company director. This guide from Tax Return Accountants explains the average turnaround times, real fees, and how to speed up your tax filing for 2026/27 and 2027/28. We reveal the factors that influence accountant turnaround time for self assessment and business returns, so you avoid costly penalties. By the end, you’ll know exactly how long accountants take to do a tax return and what steps will get your filing completed fastest.

How Long Do Accountants Take to Do Tax Return?

This article covers the real turnaround times for accountant-filed tax returns in the UK, including Self Assessment, company, and landlord returns, with practical advice for 2026/27 and 2027/28.

How Long Do Accountants Take to Do a Tax Return? (2026/27 & 2027/28 Turnaround Explained)

The average time for UK tax return completion depends on how quickly you provide full and accurate records. For most straightforward cases, such as a sole trader with one income source and clear expenses, accountants can prepare and submit the return within 2 to 10 working days. However, if your finances are complex, you have multiple income streams, or you submit records during peak season (December–January), turnaround can stretch to several weeks.

Most clients assume that hiring an accountant guarantees instant filing. In reality, delays often arise from missing paperwork or unclear information. The best way to ensure a fast accountant turnaround time for self assessment or company tax returns is to start gathering your records as soon as the tax year ends (5 April each year). Early preparation also allows your accountant to identify missing documents well before the deadline.

For example, a freelancer in Leicester approached Tax Return Accountants in late July 2026, needing a quick turnaround after a late client payment. Their invoices were scattered and no bookkeeping software was used. By importing data into Xero and requesting a few key receipts, we filed the return in just 3 days—well ahead of the deadline. The client avoided penalties and saved £400 by claiming overlooked expenses, with a total fee of £180.

Peak season means longer waits.

In the final weeks before the 31 January deadline, even the best accountants may need up to 3 weeks for complex cases. This is due to high client volume and last-minute queries from HMRC. By submitting your records in November or earlier, you maximise your chances of a fast, stress-free filing.

For more details on self-employed and company return support, visit our Self Assessment Service page.

Typical Accountant Turnaround Times (Self Assessment & Company Returns)

For most clients, the process starts as soon as you provide all requested records. Accountants review your income, expenses, and any additional reliefs or allowances. Simple returns can be completed in 2–5 days. Company tax returns and more complex cases may take 7–14 days, especially if multiple queries are needed.

Factors That Affect Completion Speed

Turnaround time depends on:

• How organised your records are
• How many income sources you have
• Whether you use modern bookkeeping software
• How quickly you respond to accountant queries
• The time of year (peak season is always slower)

How to Avoid Last-Minute Rush

Start early, keep digital records, and respond quickly to your accountant’s requests. This is the single biggest factor in avoiding late filing penalties and HMRC queries.

How Quickly Can an Accountant File a Tax Return? Real Timelines & What Speeds It Up

Fast tax return filing is possible with the right preparation.

• Fastest returns: 24–48 hours for simple cases, if all records are supplied promptly.
• Accountants need: bank statements, invoices, proof of expenses, P60/P45, and details of any additional income (e.g. rental, dividends).
• Using cloud accounting software (Xero, QuickBooks, FreeAgent, Sage) allows instant data sharing and reduces manual entry time.
• Responding quickly to queries from your accountant can shave days off the completion time.
• Late or missing paperwork is the number one cause of delays—even for experienced accountants.

Below is a table showing how different factors impact how quickly an accountant can file your tax return:

As the table shows, being organised and using digital tools can mean the difference between a one-day turnaround and a stressful, last-minute rush.

If you need ongoing support with record-keeping, our Bookkeeping Service ensures that your accounts are always up to date and ready for tax season.

What Is the Accountant Turnaround Time for Self Assessment vs. HMRC Processing?

It’s important to distinguish between how long an accountant takes to do a tax return, and how long HMRC takes to process accountant filed returns. An accountant can prepare and file a return in 2–10 days, but HMRC may take 1–2 weeks to process it, especially if refunds are involved or if there are any queries.

Accountant submissions reduce HMRC delays.

Most people think using an accountant guarantees a faster HMRC response. Actually, while accountants can speed up the preparation and reduce errors, HMRC’s own processing time is largely fixed. However, professionally filed returns are less likely to trigger HMRC queries, so overall time to finalisation is often shorter than for DIY filings.

If HMRC does raise a query, your accountant can respond directly as your registered agent. In our experience, this avoids most delays and ensures any issues are resolved quickly. For more on professional support, see our Self Assessment Service page.

Tax Return Deadlines for Small Businesses UK (2026/27 & 2027/28)

Imagine a small business owner in Birmingham who waits until January to start their tax return. With missing records and high accountant demand, their risk of late filing and HMRC penalties rises sharply.

• Register for Self Assessment by 5 October after your first trading year.
• Paper filing deadline: 31 October after the tax year ends (2026/27: 31 Oct 2027, 2027/28: 31 Oct 2028).
• Online filing deadline: 31 January after the tax year ends (2026/27: 31 Jan 2028, 2027/28: 31 Jan 2029).
• Tax payment deadline: 31 January after the tax year ends.
• Payments on account (if required): 31 January and 31 July each year.
• Late filing penalties: £100 fixed from day one, then £10 per day after 3 months (up to £900), plus 5% of tax due or £300 (whichever is greater) at 6 and 12 months.
• Interest is charged on unpaid tax from the payment deadline.
• Best time to submit tax return UK: November or earlier—this avoids the January rush and reduces the risk of HMRC backlog or queries.

Missing deadlines is costly.

If you file late, penalties start at £100 and escalate rapidly. For peace of mind, aim to have your accountant file your return at least 2 months before the final deadline.

For company directors and small businesses, our Corporation Tax Service covers all deadlines and compliance requirements.

How Much Do Accountants Charge for Tax Returns UK? DIY vs Professional Comparison

The cost of having an accountant file your tax return varies by case. For a simple employee return, expect to pay £100–£250. Self-employed sole traders typically pay £150–£500+, landlords £150–£600+, and company directors £200–£800+ for more complex filings. These fees cover not just the filing itself, but compliance checks, advice, and HMRC representation if needed.

DIY filing is free, but carries a much higher risk of mistakes, missed reliefs, and HMRC penalties. In one recent case, a Nottingham landlord who tried to file without help missed out on £900 in allowable expenses—resulting in an unnecessary tax bill and a stressful HMRC query. After switching to Tax Return Accountants, their next return was filed correctly and the error was resolved with HMRC, saving both money and time.

Professional fees buy peace of mind.

Accountants don’t just fill in boxes—they check for errors, ensure you claim all reliefs, and act as your agent with HMRC. This is especially valuable if you’re self-employed, a landlord, or have multiple income streams.

• Compliance checks to avoid penalties
• Tax-saving advice tailored to your situation
• Representation in case of HMRC queries or investigations
• Access to digital software and secure document storage
• Fixed fees—no hidden charges

For a detailed breakdown of our pricing, see our Accountant Pricing page.

Takeaway: Paying for professional support is often cheaper in the long run, especially if you value your time or have anything more than the simplest tax affairs.

How to Choose an Accountant for Your Tax Return UK

Choosing the right accountant is crucial for speed, compliance, and value.

The best way to choose an accountant for tax return UK is to follow a structured approach. Start by identifying your needs—are you a sole trader, landlord, company director, or freelancer? Next, shortlist at least three accountants who are regulated by the Institute of Chartered Accountants in England and Wales (ICAEW), Association of Chartered Certified Accountants (ACCA), or Association of Accounting Technicians (AAT). Always check their HMRC Agent status and look for real client reviews.

Unlike most guides, we recommend asking your shortlisted accountants these five questions:

• Are you VAT registered?
• Do you employ staff?
• Do you receive dividends?
• Do you own rental property?
• Do you expect income growth?

This ensures your accountant understands your full financial picture and can advise you on all relevant tax reliefs and deadlines.

Verification is essential. Many clients never check if their accountant is genuinely regulated—always confirm ICAEW, ACCA, or AAT membership using the official registers: ICAEW, ACCA, and AAT. Also check for FCA registration if you need investment advice.

For company-specific support, our Limited Company Accountants page explains exactly what to look for in a trusted adviser.

Tax Return Accountant Turnaround: By Industry, Software & Location

Does industry or software choice affect accountant turnaround time for self assessment?

• Industry specialism matters: Contractors, freelancers, landlords, and ecommerce sellers benefit from accountants who know sector-specific rules—this can cut days off the turnaround.
• Software speeds things up: Xero, QuickBooks, FreeAgent, and Sage Accounting let you and your accountant share data instantly, reducing manual entry and errors.
• Local knowledge helps: Accountants in Leicester, London, Birmingham, Manchester, Nottingham, and the East Midlands understand regional compliance needs and deadlines.

See how turnaround varies by industry below:

For freelancers and gig workers, using FreeAgent or Xero means your accountant can access live transaction data, speeding up the process. Landlords benefit from accountants who understand property reliefs and can process rental statements quickly—this is especially important if you own property in different regions.

For more on specialist support, see our Freelance Accountants and Landlord Accountants pages.

FAQs: How Long Do Accountants Take, Fees, Deadlines & Changing Accountant

For more on landlord and sole trader support, visit our Landlord Accountants page.

How to Find an Accountant Near You

Finding a reliable accountant near me is easier than ever, but local expertise still matters. Tax Return Accountants serves clients across Leicester, London, Birmingham, Manchester, Nottingham, and the wider East Midlands. Whether you’re searching for a local accountant or a chartered accountant near me, choosing someone with regional knowledge can help you meet all deadlines and avoid location-specific compliance issues.

In Leicester, our team offers face-to-face consultations and same-day document drop-off for urgent cases. London clients benefit from our remote filing and digital document services, ideal for busy professionals. In Birmingham, we support construction and healthcare businesses with sector-specific advice. Manchester and Nottingham clients appreciate our fast turnaround and local tax insights, while East Midlands businesses rely on us for tailored advice on Corporation Tax and VAT Returns.

NAP: Tax Return Accountants, 6 Egginton Street, Leicester, LE5 5BA, 0116 4030595

Our Google Business Profile is rated 4.9/5, and you can read our reviews online. For more information, visit the official GOV.UK accountant finder or the ICAEW directory.

Below is a table showing how to verify your accountant’s credentials:

Always check these before instructing any accountant—local or online.

UK Accountancy Statistics

• Over 93,000 chartered accountants in the UK
• 1.5 million+ businesses enrolled in Making Tax Digital
• 800,000+ HMRC late filing penalties issued in 2024/25
• 62% of UK SMEs use an external accountant

Next Steps

1. Gather all relevant records and organise them digitally if possible.
2. Book a free consultation with a regulated accountant well before the deadline.
3. Ask for a fixed fee quote and check their regulatory credentials.

Why Choose Tax Return Accountants?

• ICAEW regulated
• AAT accredited
• Fixed fees from £7.50/month
• MTD compliant
• Dedicated accountant
• UK-wide service
• Leicester based
• Free initial consultation