1 February 2026 – Due date for Corporation Tax payable for the year ended 30 April 2025.

19 February 2026 – PAYE and NIC deductions due for month ended 5 February 2026. (If you pay your tax electronically the due date is 22 February 2026)

19 February 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 February 2026.

19 February 2026 – CIS tax deducted for the month ended 5 February 2026 is payable by today.

1 March 2026 – Due date for Corporation Tax due for the year ended 31 May 2025.

2 March 2026 – Self-Assessment tax for 2024-25 paid after this date will incur a 5% surcharge unless liabilities are cleared by 1 April 2026, or an agreement has been reached with HMRC under their time to pay facility by the same date.

19 March 2026 – PAYE and NIC deductions due for month ended 5 March 2026 (If you pay your tax electronically the due date is 22 March 2026).

19 March 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 March 2026.

19 March 2026 – CIS tax deducted for the month ended 5 March 2026 is payable by today.

If you are self-employed, knowing which everyday costs you can legitimately claim can make a real difference to how much tax you end up paying.

The question of which costs you can claim against your self-employed business is a common one. If you are self-employed it is important to be aware if an expense is allowable or not. Any allowable costs can be used to reduce your taxable profit.

HMRC lists the following office expenses as being allowable:

• office costs, for example stationery or phone bills
• travel costs, for example fuel, parking, train or bus fares
• clothing expenses, for example uniforms
• staff costs, for example salaries or subcontractor costs
• things you buy to sell on, for example stock or raw materials
• financial costs, for example insurance or bank charges
• costs of your business premises, for example heating, lighting, business rates
• advertising or marketing, for example website costs
• training courses related to your business, for example refresher courses

If you work from home, you may also be able to claim a proportion of your costs for things including heating, electricity, Council Tax, mortgage interest or rent and internet and telephone use. You will need to adopt a fair and reasonable approach to apportioning your costs, such as by reference to the number of rooms used for business purposes or the proportion of time you work from home.

Starting a new business can be expensive, but many of your pre-trading costs may qualify for tax relief if they meet the right conditions.

There are special tax reliefs for pre-trading expenses that are incurred before a business starts trading. This could include expenses that are required to help a business prepare for trading such as buying stock and equipment, renting premises, getting insurance and initial advertising expenditure. 

A deduction may be allowed where the following conditions are met: 

• The expenditure is incurred within a period of seven years before the date the trade, profession or vocation commenced, and
• the expenditure is not otherwise allowable as a deduction in computing the profits of the trade, profession or vocation but would have been so allowable if incurred after the trade had commenced.

To be allowable, the pre-trading expenditure must be incurred wholly and exclusively for the purposes of the relief. To be clear, this means that no relief would be allowed where pre-trading expenses would not have been tax deductible if they had been incurred when the business was trading. The business should keep accurate records relating to pre-trading expenditure to be able to demonstrate that the expenses are qualifying.

The qualifying pre-trading expenditure is treated as incurred on the day on which the trade, profession or vocation is first carried on. 

Capital expenditure does not qualify for this relief but there are other special provisions for capital allowances. 

Did you know you can monitor any UK company for free and get email alerts when key details change, which can help protect your own business from unexpected or unauthorised filings?

A significant amount of information about companies is available in the public domain from Companies House. Companies House is responsible for incorporating and dissolving limited companies, examining and maintaining statutory records, and making company information publicly accessible.

Much of this information is available free of charge, in line with the government’s commitment to open data. As a result, all publicly available digital information held on the UK register of companies can be accessed without cost.

The information available includes core company details such as the registered address and date of incorporation, details of current and resigned directors and officers, copies of documents filed with Companies House, mortgage and charge information, previous company names and insolvency records.

In addition, you can choose to monitor a company and receive email alerts whenever new documents are filed, such as changes to directors or registered office addresses. This can also be a useful safeguard for your own company, helping you to identify any unexpected or unauthorised filings at an early stage.

From April 2026, Making Tax Digital for Income Tax (MTD for IT) will become mandatory for many self-employed persons and landlords, marking a significant change in how they manage their tax affairs. The new regime is designed to modernise the tax system by requiring taxpayers to interact with HMRC through an online tax account, rather than relying solely on an annual self-assessment return.

Initially, MTD for IT will apply to individuals with qualifying income of more than £50,000 a year from self-employment and/or property. From 6 April 2027, the scope will widen to include those with income between £30,000 and £50,000. Alongside this, a new points-based penalty system will be introduced for the late filing and late payment of MTD for IT liabilities.

Under MTD for IT, affected taxpayers will need to keep digital records of their income and expenses using compatible software. Instead of reporting everything once a year, they will be required to send quarterly updates to HMRC, providing a summary of their business or property income and costs. These updates are not tax bills, but they are intended to give HMRC a clearer picture of income throughout the year. A final declaration will still be required after the end of the tax year, with any tax due payable by 31 January following the year end.

Qualifying income is a key concept under MTD for IT. It is broadly the total income earned in a tax year from self-employment and property income, including income from multiple trades or rental properties. Other sources of income reported on a tax return, such as employment income under PAYE, dividends, pensions or partnership income, does not count towards this threshold.

If you are unsure how MTD for IT will affect you, or would like any support preparing for the change, we would be happy to help.