HMRC and Companies House have confirmed that from 1 April, all businesses must use compliant, commercial software to file their company’s tax returns.

As of 31 March, the free joint online service, commonly known as the CATO portal, from these two Government bodies has been removed and you must now use software to file company tax returns to HMRC.

Unlike with your company’s tax returns, you can still, for the time being, file annual accounts at Companies House using third-party software, WebFiling services or paper filing.

The decision has been made to end the free join online service as it is “outdated and no longer aligns with modern digital standards”, according to Companies House.

This change is in line with the introduction of the Economic Crime and Corporate Transparency Act, which implemented “enhanced corporation tax requirements and changes to UK company law.”

It also follows on from a major IT security breach at Companies House, identified in March 2026, that exposed the WebFiling system and allowed some users to potentially access and amend the details of other companies.

Although the breach has now been resolved and security strengthened, it has raised concerns about the reliability of GOV.UK One Login service.

Can you still amend previous returns using the free service?

HMRC and Companies House have confirmed that now that the free filing service has closed, company directors will have to use commercial tax software if they need to make changes to a previously submitted Corporation Tax return or refile a rejected return.

From now onwards, any previously filed financial information will no longer be available in the system, as it has not been retained and will need to be entered again.

HMRC has said that, for amendments, it will also be acceptable to send a paper return to the Corporation Tax Services office.

If you have previously filed financial accounts with Companies House and you want to make changes or corrections, this will also need to be done via commercial software or by sending paper accounts to Companies House via post.

Are there any exceptions to this new rule?

Companies can file a paper Corporation Tax return only in limited circumstances, such as if they wish to submit it in Welsh or can demonstrate a valid, reasonable excuse to HMRC. Otherwise, returns must be filed online using commercial software.

If you are affected by this change and need help choosing and utilising commercial software to complete your Corporation Tax return, please speak to our team.

Capital allowances continue to provide an effective method for businesses to reduce their tax bills, by providing incentives for investment in eligible expenditure – typically plant and machinery.

Historically, these reliefs have been subject to change and the 2026/27 tax year is no different, as the Government moves to alter two key reliefs – Writing Down Allowance (WDA) and a new First-Year Allowance (FYA).

Reduction of the Writing Down Allowance

The WDA will be reduced from 18 per cent to 14 per cent on the main pool of qualifying plant and machinery assets.

This change has been introduced on two different dates, starting with companies subject to Corporation Tax on 1 April and followed shortly thereafter by those subject to Income Tax, such as sole traders and partnerships, from 6 April.

Businesses with large brought forward main pool expenditures are expected to lose the most from the reduction in the main rate of WDA.

In the long-term, the change may also reduce incentives for investment in second-hand assets and cars, which benefited under the previous rules.

The new First-Year Allowance

To offset some of the impact of the reduction in WDA, a new 40 per cent FYA on main rate expenditure, primarily still covering plant and machinery, will now be available.

This new FYA is intended to encourage investment in areas where other FYAs don’t allow, in particular, assets bought by unincorporated businesses and leases.

Sole traders and partnerships will, for the first time, be able to get additional support at the point of investment, which means that more businesses will be able to reduce their tax bill in the same year as their investment.

This is expected to give a quick cashflow boost to those affected and provide additional support for future investments.

However, it is important to note that this FYA does not support investment in second-hand assets, cars or leased assets in other countries.

Finally, the Government has also confirmed that small business owners will continue to benefit from tax relief on electric vehicles, as the 100 per cent FYA for zero-emission vehicles and charge points has been extended until 31 March 2027 for Corporation Tax and 5 April 2027 for Income Tax.

This gives businesses greater certainty when planning ahead, while also providing a strong financial incentive to invest by reducing tax bills upfront.

Want to make more of capital allowances?

If you think you may be eligible for capital allowances, either due to the changes outlined in this article or more generally, then it is important that you claim the tax relief available to you.

If you would like help reviewing the current capital allowances that your business can claim, please get in touch.

Directors and employees claiming work-from-home tax relief will no longer be able to claim it from the start of the new tax year – 6 April 2026.

Why is this relief being taken away?

The Chancellor announced the removal of the work-from-home relief as part of her latest Autumn Budget.

The main reasoning given for the abolition is that it will support the nation’s deficit reduction.

HMRC has also said that it no longer believes it is fit for purpose or easy to police.

Who could claim work-from-home relief?

Work-from-home relief has been utilised by homeworkers since the early 2000s, helping them offset some of the costs of heating, lighting, broadband and other home-office expenses required to complete their jobs.

The relief allowed employees and directors to claim a flat rate of £6 per week or a deduction for actual costs.

However, those who do not claim the flat fee were required to provide evidence of the exact costs, such as an invoice or bill.

Eligibility for the relief only applied to individuals who had no other choice but to work from home.

For instance, where the business did not have an office or the daily commute was not feasible. Individuals who simply preferred to work from home did not qualify.

Is there any relief still available for home workers?

The only remaining tax-free support will be reimbursements made directly by employers.

This applies only where the payments relate to demonstrated additional household costs and where the costs are incurred wholly, exclusively and necessarily for employment duties.

For anyone still claiming work-from-home relief, it is worth reviewing your position now to understand how this abolishment will impact your take-home pay.

From the end of the 2025/26 tax year, 5 April 2026, you must report your dividend income accurately as part of wider personal tax reforms.

Directors of close companies must disclose the company name, registration number, specific dividend amounts and their highest percentage shareholding on Self-Assessment returns.

Dividends from your own company must also be shown separately from other income.

Dividend tax rates for 2026/27

For the 2026/27 tax year, commencing 6 April 2026, two dividend tax rates will increase by two percentage points:

• Basic rate rises to 10.75 per cent
• Higher rate rises to 35.75 per cent

There is currently no increase for additional rate taxpayers, who will continue to pay dividend tax at a 39.35 per cent.

The annual dividend allowance also remains at £500 and applies to all rates.

Dividends continue to offer a tax advantage over salary in most cases, although the difference between the two is reducing.

Directors should review how profits are taken and consider whether the current mix of salary and dividends remains appropriate.

Who has to report dividend tax?

Dividend tax most commonly applies to shareholders and company directors.

Individuals receiving dividends outside of an ISA or pension over the £500 allowance threshold must report them to HMRC.

Anyone who receives more than £10,000 in dividends may be required to submit a Self-Assessment tax return.

Reviewing your position

If you have concerns about dividend taxation or wider financial pressures, we can review your tax position, explain the latest changes from HMRC and help you create a bespoke plan to meet your personal financial goals.

Looking to understand and protect your finances? Speak to our experts.

For landlords and sole traders bringing in qualifying annual income over £50,000 (not including dividends), Making Tax Digital (MTD) for Income Tax is now mandatory.

For income to qualify, it must be earned from self-employment or property rental, exceed the threshold in a tax year and be subject to UK Income Tax.

Please note that the total income is calculated before deducting expenses, tax or allowances.

Crossing the qualifying threshold of £50,000 in the 2024/2025 or 2025/2026 tax year will mean MTD obligations apply for the 2026/2027 tax year even if income has now decreased.

Important dates to remember

HMRC requires quarterly updates to be submitted one month after the end of each period.

For a standard tax year, the deadlines fall on:

• 7 August
• 7 November
• 7 February
• 7 May

How to stay compliant

To stay compliant, you should take each of the following steps:

• Check your income level to see if you exceed the £50,000 threshold.
• Choose which MTD compliant software to use.
• Test your reporting processes to identify any potential issues and resolve them accordingly.
• Submit quarterly updates of your income and expenses to HMRC.
• Keep digital records.
• Submit a final declaration by 31 January following the tax year end.

For landlords and sole traders whose qualifying income exceeds £30,000, you have another year to prepare for MTD, but it does not hurt to get started now to give yourself more time to adapt to the new requirements.

A further phase of MTD for Income Tax will take place in April 2028 for landlords and sole traders with qualifying income that exceeds £20,000.

If you are unsure whether you are affected by this first phase of MTD for Income Tax or have any questions about your compliance requirements, speak to our experts.