Tax deadlines are easy to put off until they are suddenly right in front of you. For a sole trader, missing a Self Assessment deadline can mean penalties and interest. For a limited company, there is even more to keep track of, including Corporation Tax, company accounts and Companies House filings. Choosing the right Tax Filing Service can take much of this pressure away and make the filing process easier to manage.
HMRC is also changing how sole traders and landlords report Income Tax. Since 6 April 2026, Making Tax Digital for Income Tax has applied to certain sole traders and landlords with qualifying income of more than £50,000 from self-employment and property.The threshold is due to fall to above £30,000 from April 2027 and above £20,000 from April 2028. This means choosing suitable online tax software or an accountant is becoming more important for many self-employed people.
The best online Tax Filing Service depends on what you need. MyIVA is a strong choice if you want an accountant to handle Corporation Tax, company accounts and Self Assessment for you. Taxfix, GoSimpleTax and Taxd are useful for people who mainly need Self Assessment support, while FreeAgent, QuickBooks and Xero are better suited to those who also want accounting and record-keeping tools.
In this guide, you will learn how we ranked 10 popular options, what is changing under MTD ITSA in 2026, and which provider may suit your needs as a sole trader or limited company owner.
How We Ranked These Providers?
There is no single Tax Filing Service that is right for everyone. A sole trader with a straightforward Self Assessment return has different needs from a limited company director who must deal with Corporation Tax and annual accounts. We therefore looked at the type of taxpayer each provider supports, filing options, HMRC recognition, software features, accountant support and how simple the service is to use.
We considered the following factors when comparing providers:
Filing capability
We looked at whether the provider can support Self Assessment, Corporation Tax returns, company accounts, VAT returns or Making Tax Digital requirements.
HMRC-compatible software
Where providers offer software, we considered whether it is listed by HMRC for relevant tax submissions. HMRC does not endorse or recommend individual commercial software providers. Instead, it publishes lists of software capable of submitting specific returns and supplementary pages.
Ease of use
We considered how clearly the provider presents data entry, tax calculations, document uploads and filing processes.
Support level
Some providers offer DIY software only, while others provide accountant review, tax advice or full filing support.
Value for money
We considered the service offered against likely cost. A low-cost software package may suit a simple return, while an accountant-led service may be better value for a more complex position.
MTD for Income Tax (MTD ITSA): What’s Changing in 2026
Making Tax Digital for Income Tax, often called MTD ITSA, changes how some sole traders and landlords keep records and report relevant income and expenses to HMRC.
From 6 April 2026, the rules apply to individuals with qualifying income from self-employment and property of more than £50,000, based on combined gross qualifying income from self-employment and property, before expenses are deducted.
People with qualifying income above £30,000 will come into MTD ITSA from 6 April 2027, while those above £20,000 are due to come into the system from 6 April 2028. Affected taxpayers need compatible software to keep digital records and send quarterly updates to HMRC.
Key MTD ITSA changes in 2026
- 6 April 2026: MTD ITSA becomes mandatory for qualifying income above £50,000.
- Digital records: Affected sole traders and landlords must keep relevant income and expense records digitally.
- Quarterly updates: Income and expense information must be sent to HMRC through compatible software.
- Final declaration: The tax year still needs to be finalised after the quarterly updates.
- Software is required: You need MTD-compatible software, either yourself or through an agent such as an accountant.
- The threshold will fall: The requirement is due to extend to qualifying income above £30,000 in April 2027 and above £20,000 in April 2028.
If MTD ITSA applies to you, it is worth choosing software or an accountant that can support the new process. Starting early can also make the move from traditional Self Assessment less stressful.
Comparison Table
The 10 providers below cover different needs. Some are online accountants, while others are tax return or accounting software. The right choice depends on whether you want to prepare the return yourself or have a professional handle the filing.
| Provider | Best for | Type |
| MyIVA | Sole traders, individuals and limited companies wanting expert filing | Accountant-led Tax Filing Service |
| Taxfix | Individuals wanting accountant-prepared Self Assessment | Online tax accountant |
| Crunch | Sole traders and limited company owners wanting software plus accountants | Online accountancy service |
| Taxd | Straightforward Self Assessment and tax returns | Online tax service |
| GoSimpleTax | DIY Self Assessment | Tax return software |
| FreeAgent | Sole traders and small companies wanting accounting software | Cloud accounting software |
| QuickBooks | Sole traders needing accounting and MTD tools | Accounting software |
| Xero | Accountants and companies needing accounts and tax tools | Cloud accounting and tax software |
| TaxCalc | Professional and individual tax filing | Tax software |
| TinyTax | Limited companies needing CT600 and accounts filing | Online filing software |
The providers differ quite a lot, so do not choose based on the name alone. Check whether the service covers the return you actually need.
The 10 Best Online Tax Filing Services in the UK
The providers below have been selected because they offer useful options for sole traders, individuals, limited companies or professional tax filing. Some are better for DIY filing, while others provide direct accountant support.
1. MyIVA
MyIVA is a strong option for people who would rather have an expert prepare and submit their tax return than manage everything themselves. It focuses on Corporation Tax, company accounts and personal Self Assessment, making it suitable for both sole traders and limited company directors.
For limited companies, MyIVA can prepare, check and file the CT600 with HMRC, review allowable expenses and provide proof of submission. Its Corporation Tax service also includes help with tax planning and profit extraction.
Key features include:
- CT600 preparation, checking and filing
- Company accounts filing
- Self Assessment tax returns
- Tax planning and advisory support
- Direct communication with HMRC where required
- Dedicated tax expert support
- Fixed-fee filing options
MyIVA offers a fixed‑fee company accounts and Corporation Tax filing package for active non‑VAT limited companies at £199 + VAT for a limited period (normally £325 + VAT), with a typical 3–5 working day turnaround once all required information has been provided.
2. Taxfix
Taxfix is aimed mainly at individuals who need help with Self Assessment. A UK-based accountant prepares the return after you provide your information online.
Features:
- Online Self Assessment
- UK-based accountant support
- Different levels of support
- Accuracy guarantee subject to terms
3. Crunch
Crunch combines accounting software with human accountant support. It offers packages for sole traders and limited companies and supports Self Assessment and MTD ITSA.
Features:
- Self Assessment filing
- MTD ITSA software
- Corporation Tax support
- Companies House filing
4. Taxd
Taxd focuses on online tax returns and Self Assessment. It offers different levels of support and covers areas such as self-employment, employment, dividends, property income and foreign income.
Features:
- Online Self Assessment
- HMRC-recognised software
- Property and foreign income support
5. GoSimpleTax
GoSimpleTax is designed for people who want to complete their own Self Assessment online. It provides plain-English prompts, tax calculations and checks before allowing the return to be submitted to HMRC.
Features:
- Self Assessment software
- Direct HMRC submission
- Automatic tax calculations
- Allowance and relief prompts
6. FreeAgent
FreeAgent is useful for sole traders and small companies that want accounting and tax features in one place. It supports Self Assessment, MTD ITSA and other HMRC submissions, while also offering bookkeeping and financial reports.
Features:
- Self Assessment filing
- MTD ITSA support
- VAT filing
- Corporation Tax and year-end filing
7. QuickBooks
QuickBooks UK is widely used for accounting and record keeping. Its UK products support MTD and can help sole traders prepare their Self Assessment information, although the exact submission options depend on the product being used.
Features:
- Income and expense tracking
- MTD ITSA support
- Income Tax estimates
8. Xero
Xero UK offers cloud accounting and professional tax tools. Xero Tax supports Corporation Tax, personal tax and partnership returns for accounting professionals, with direct filing options for HMRC and Companies House.
Features:
- Corporation Tax & Personal Tax returns
- MTD support
- HMRC and Companies House filing
- Data flow between accounts and tax returns
9. TaxCalc
TaxCalc is a well-established UK tax software option used by tax professionals and individuals. HMRC’s current Self Assessment list shows TaxCalc as supporting individual, partnership and trust returns, while its Corporation Tax list shows it can produce and submit CT600 returns and iXBRL documents.
Features:
- Self Assessment & Corporation Tax
- iXBRL accounts and computations
- Support for different tax return types
10. TinyTax
TinyTax is particularly useful for limited companies that need to file a CT600 and annual accounts. It can submit the Corporation Tax return to HMRC and accounts to Companies House from the same process.
Features:
- CT600 filing
- Companies House accounts
- Marginal relief calculation
Overall, the best choice depends on how much help you need. Software may suit someone comfortable with figures, while an accountant-led Tax Filing Service can be a better choice if you want someone to check the figures and handle the submission.
How to Choose the Right Provider for You
Choosing a Tax Filing Service is not simply about finding the lowest price. A cheap option may only provide software, while a slightly more expensive service may include accountant checks, tax advice and filing support. Think about your tax position, the type of return you need and how much work you want to do yourself.
1. Check What You Need to File
A sole trader may only need Self Assessment, while a limited company may need Corporation Tax, company accounts and a director’s Self Assessment. Make sure the provider covers all relevant filings.
2. Look at MTD Compatibility
If MTD ITSA applies to you, your software needs to support the required digital records and quarterly updates. Check the current HMRC software guidance before choosing a product.
3. Decide How Much Help You Want
If you are happy entering figures yourself, software can be enough. If you are unsure about expenses, tax reliefs or Corporation Tax calculations, an accountant-led service may give you greater peace of mind.
4. Compare the Full Cost
Check whether the advertised price includes filing, accountant review, VAT, amendments or support. A low headline price is not always the lowest final cost.
5. Check HMRC Recognition
HMRC maintains lists of commercial software suppliers for Self Assessment and Corporation Tax. Use these lists to check whether the software supports the type of filing you need.
The right Tax Filing Service should make your tax responsibilities easier, not add another complicated task to your list.
Common Mistakes to Avoid When Filing Online
Online filing can save time, but mistakes can still cause problems. Entering the wrong income, missing allowable expenses or selecting the wrong tax return can lead to an incorrect tax calculation. For a limited company, errors can also affect the CT600 and statutory accounts.
1. Missing the Deadline
Late filing can result in penalties.
- Check the relevant HMRC deadline.
- Set reminders well in advance.
- Do not wait until the final day.
2. Forgetting Allowable Expenses
Some taxpayers forget legitimate expenses because they do not keep good records.
- Keep receipts and invoices.
- Separate personal and business costs.
- Check which expenses are allowable.
3. Entering the Wrong Figures
A small mistake in income or expenses can change the tax calculation.
- Check bank records.
- Compare figures with invoices.
- Review the final return before submission.
4. Ignoring MTD ITSA
Some sole traders now have to follow MTD ITSA.
- Check your qualifying income.
- Use compatible software.
- Keep digital records.
5. Assuming Software Checks Everything
Tax software can identify many errors, but it cannot know information you have not entered.
- Review every section.
- Include other sources of income.
- Keep supporting records.
Taking a few extra minutes to review your return can prevent avoidable problems later.
FAQs: Frequently Asked Questions
What is the best online Tax Filing Service in the UK?
The best option depends on your needs. MyIVA is a strong choice if you want an accountant to handle Corporation Tax, company accounts or Self Assessment, while GoSimpleTax and similar software can suit people who prefer to file themselves.
Can I file my Corporation Tax return without an accountant?
Yes. A limited company can file its Corporation Tax return using suitable commercial software. HMRC maintains a list of software that can produce and submit CT600 returns.
Do I need MTD-compatible software as a sole trader in 2026?
If your qualifying income from self-employment and property is more than £50,000, MTD ITSA applies from 6 April 2026. You will need compatible software to keep digital records and send the required updates to HMRC.
How much does it cost to file taxes online in the UK?
Costs vary widely. Some software is low-cost or free to start, while accountant-led filing services charge more because they include professional support. Always check what is included before choosing.
Is it safe to submit tax returns directly to HMRC through third-party software?
Yes, provided you use suitable software that HMRC recognises for the relevant filing. HMRC publishes commercial software lists for Self Assessment and Corporation Tax, but it does not endorse individual products.
Conclusion
Choosing the right Tax Filing Service depends on your needs. While tax software may suit straightforward returns, sole traders and limited company owners with more complex finances may benefit from professional support. The 2026 MTD ITSA changes also make it important to choose suitable software or an accountant early, especially as the income thresholds are set to fall in the coming years.
MyIVA provides an accountant-led Tax Filing Service covering Corporation Tax, CT600 filing, company accounts, Self Assessment, bookkeeping, VAT and tax planning. With expert support and a simple online process, MyIVA can help you manage your tax obligations with less stress.
Need help with your next tax return? Contact MyIVA today and let an experienced tax expert handle your filing, so you can get on with your work without the usual tax stress.
