Many employers have a social event for employees around the Christmas period. This may take the form of a Christmas party or dinner or another social event, such as wreath-making and cocktails. When planning the event, it is important to consider the tax and National Insurance implications up front. Although there is a specific tax exemption for annual parties and other functions, there are conditions that must be met for the exemption to apply. Ensuring that your Christmas event meets these conditions at the planning stage will prevent employees being hit with a tax charge on the associated benefit.

Conditions

To qualify for the exemption, the party or function must be:

• an annual party or function; and
• available to the employer’s employees generally or to those at a particular location.

Where there is a single annual party or function in the tax year, the cost per head must not exceed £150. Where there is more than one annual party or function in the tax year, the combined cost must not exceed £150 for all events to fall within the scope of the exemption. The cost per head is found by dividing the total cost of the party or function plus the cost of any transport incidentally provided by the total number of attendees (employees plus guests).

Watchpoints

Only annual events qualify for the exemption. As the name suggests, these are events that are held every year, such as an annual staff Christmas party. If the event is a one-off event, the exemption will not apply. This is the case regardless of whether the event is open to all employees and the cost per head is not more than £150.

To fall within the exemption, the event must also be open to all employees or all those at a particular location. HMRC have confirmed that departmental events qualify. However, an event for senior staff only would not fall within the scope of the exemption.

When calculating the cost per head, VAT is included even if this is subsequently recovered. It is also important to include guests as well as employees when performing the calculation. However, if the cost per head is more than £150, the full amount is taxable, not just the excess over £150. Where an employee brings a guest and the cost per head exceeds £150, the employee will be taxed on their attendance and that of their guest.

If there is more than one annual function in the tax year, the functions will be exempt as long as the combined cost per head is not more than £150. Where this limit is exceeded, the employer can choose how best to use the exemption. When allocating the exemption, remember to consider the impact of guests – it is better to leave an event costing £100 per head attended only by employees in charge than one costing £80 per head which is attended by employees and their partners as here the taxable amount will be £160 (2 x £80).

Consider a PSA

If a tax charge does arise in respect of a Christmas event, as will be the case, for example, if the event is not an annual event, the employee will suffer a benefit in kind tax charge. The taxable amount will be the cost per head for the employee and any associated guests. The employer will also suffer a Class 1A National Insurance charge.

To maintain the goodwill element of the event, the employer may wish to include the benefit within a PAYE Settlement Agreement and meet the associated tax liability on the employee’s behalf.

It used to be possible to report errors in a VAT return to HMRC on form VAT652. This is no longer the case; form VAT652 was withdrawn from 5 September 2025. This means that now, where an error has been made in a VAT return, the error must be corrected in one of the following ways:

• updating the next VAT return;
• making the correction online; or
• writing to HMRC to notify them of the correction.

Updating the next VAT return

An error can be corrected by making an adjustment in the next VAT return if the value of the error is £10,000 or less or if the error is between £10,000 and £50,000 and does not exceed 1% of the box 6 figure (net outputs) in the VAT return for the period in which the error was discovered.

A correction can only be made by updating the next VAT return if the error was made carelessly.

The net value of the error is the difference between the additional amount owed to HMRC as a result of the error and the additional refund due from HMRC as a result of the error.

Correcting the error online

If the value of the error is more than £50,000, is between £10,000 and £50,000 and more than 1% of the box 6 figure in the VAT return  for the period in which the error was discovered or was made deliberately, it must be notified to HMRC rather than being corrected in the next VAT return. The default route for doing this is to make the correction online. The trader will need to sign into their Government Gateway account.

When reporting the error online, the following information must be provided:

• how each error arose;
• the VAT accounting period in which it occurred;
• whether it was an input tax error or an output tax error;
• the VAT underdeclared or overdeclared in each VAT period;
• how the VAT over or under declaration was calculated;
• whether any of the errors resulted in the payment of an amount to HMRC that was not due; and
• the total amount to be adjusted.

Refund claims can only be accepted where all the above information is provided.

Notifying in writing

If the trader is unable to use the online service, they will need to notify HMRC in writing of the errors if they are of a type that cannot be corrected in the next VAT return. The letter must include the trader’s VAT registration number and the information listed above. It should be sent by post to:

BT VAT

HMRC

BX9 1WR

Time limit

Errors should be corrected as soon as possible, but time limits do apply.

The time limit for correcting errors in a VAT return is four years from the end of the prescribed period in which the error occurred where the error related to output tax or over-claimed input tax, and four years from the due date of the return for the prescribed accounting period where the error related to under-claimed input tax.

The four-year time limit does not apply to deliberate errors.

Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) is mandatory from 6 April 2026 for self-employed traders and landlords whose combined gross trading and business income in 2024/25 is £50,000 or more. Those within MTD for ITSA must maintain digital records and submit quarterly updates and a final declaration to HMRC electronically using software compatible with MTD for ITSA.

As the name suggests, MTD for ITSA relies on digital record-keeping and communication. HMRC recognise that not everyone is able to operate in a digital world and those who they accept as being ‘digitally excluded’ can apply for an exemption from MTD for ITSA.

Meaning of ‘digitally excluded’

HMRC acknowledge that there are various reasons why a person may consider themselves digitally excluded. For example, a person may be digitally excluded because:

• their age, a health condition or a disability prevents them from using a tablet, computer or smartphone to keep digital records and to submit returns to HMRC;
• they are a practising member of a religious society or order whose beliefs are incompatible with using digital communications or keeping digital records and they do not use a computer, tablet or smartphone for business or personal use; or
• they cannot get internet access at their home or business because of their location, and they are unable to get access at a suitable alternative location.

However, HMRC will not accept an application for exemption from MTD for ITSA if the only reason for the application is one of the following:

• the person previously filed a paper tax return;
• the person is unfamiliar with accounting software;
• the person only has a small number of records to create each year; or
• the person will spend extra time or incur additional costs as a result of complying with MTD for ITSA.

Where a person has an existing exemption from MTD for VAT because they are digitally excluded, providing that the person’s circumstances have not changed, HMRC will accept that they are also exempt from MTD for ITSA.

Applying for an exemption

To apply for an exemption from MTD for ITSA on the grounds of digital exclusion, a person will need to write to HMRC ahead of their MTD for ITSA start date. They must provide the following information:

• their National Insurance number;
• their name and address;
• details of how they currently submit their returns (including the use of an agent or other person to submit them on their behalf);
• the reason that they think that they are digitally excluded, including information in support of their claim;
• whether they have an accountant or agent and what they do for them; and
• any additional needs that they have.

An application can be made by an agent on behalf of someone who is digitally excluded.

It should be noted that if a person is unable to use digital returns themselves, for example because of age or disability, but they have an agent or someone else who can keep digital records and file digital returns on their behalf, an exemption will not be forthcoming.

The application should be sent to:

Self Assessment

HM Revenue and Customs

BX9 1AS

Where a person is already exempt from MTD for VAT because they are digitally excluded, they will also need to write to HMRC to apply for an exemption from MTD for ITSA, providing their National Insurance number, their VAT registration number and the reason that they are digitally excluded from submitting their VAT returns using software that is compatible with MTD for VAT.

An agent can apply for an exemption on a client’s behalf.

Other exemptions

The following are automatically exempt from MTD for ITSA and are unable to sign up voluntarily:

• those completing a tax return as a trustee, including a trustee of a charitable trust or a non-registered pension scheme;
• a person who does not have a National Insurance number on 31 January before the start of the tax year;
• a person completing a tax return as the personal representative of someone who has died;
• a Lloyd’s underwriters in respect of their underwriting activity; and
• a non-resident company.

Anyone in the above groups does not need to apply for an exemption as it is automatic.

The rate at which a company pays corporation tax depends on the level of its taxable profits. Where a company’s profits are below the lower profits limit, corporation tax is charged on all profits at the rate of 19% and where a company’s profits are more than the upper profits limit, they are all taxed at the rate of 25%. However, where the profit falls between these limits, corporation tax is charged at the rate of 25% and reduced by marginal relief. The effect of this is to provide a gradual increase in the rate of corporation tax from the small profits rate to the main rate.

For the financial years 2024 and 2025, the lower profits limit is £50,000 and the upper profits limit is £250,000. Where a company has one or more associated companies, these limits are divided by the number of associated companies plus one, so if a company has one associate, the limits are, respectively, £25,000 and £125,000. The limits are also proportionately reduced where the accounting period is less than 12 months.

Marginal relief is calculated by reference to the following formula:

F x (U – A) x N/A

Where:

F is the marginal relief fraction;

U is the upper profits limit;

A is the augmented profits for the accounting period; and

N is the total taxable profits for the accounting period.

The marginal relief fraction for the financial year 2025 is 3/200, unchanged from the financial year 2024.

Augmented profits are the company’s total taxable profits plus qualifying exempt distributions received by the company which are not excluded. Qualifying exempt distributions include dividends, distributions of assets, amounts treated as a distribution on the transfer of assets and liabilities and bonus issues following a repayment of share capital. Distributions are excluded from the calculation of augmented profits if they are from a 51% subsidiary, a company of which the recipient is a 51% subsidiary or a trading company or relevant holding company that is a quasi-subsidiary of the recipient.

If the company has no qualifying exempt distributions to take into account, augmented profits are the same as taxable profits and the formula can be simplified to F x (U – A).

To make things easier, HMRC have produced a tool which can be used to work out marginal relief. This can be found on the Gov.uk website at www.tax.service.gov.uk/marginal-relief-calculator.

Example

A Ltd prepares accounts to 31 March each year. For the year to 31 March 2025, it had taxable profits of £80,000. It does not receive any qualifying exempt distributions. Consequently, its augmented profits are also £80,000.

The company’s marginal relief is calculated as follows:

3/200 x (£250,000 – £80,000) x 1 = £2,550.

At the main rate, the company would pay corporation tax of £20,000 on its profits (£80,000 x 25%).

The company’s corporation tax bill is therefore £17,450, being corporation tax at the main rate of 25% (£20,000) as reduced by the marginal relief of £2,550.

The company’s effective rate of corporation tax is 21.81%.

A taxpayer may have grounds for appealing a penalty if they have a reasonable excuse for missing a filing or payment deadline. However, it is important to realise that the appeal will only succeed if HMRC accept that the excuse is indeed reasonable. In this regard, the bar is set high.

The first point to note is that there is no statutory definition of ‘reasonable excuse’. Whether a person has a reasonable excuse depends on the circumstances in which the failure to meet the obligation occurred, as well as the circumstances and the abilities of the person who failed to meet the obligation. Consequently, what might be a reasonable excuse for one person may not be a reasonable excuse for someone else.

HMRC’s approach

In determining whether an excuse is ‘reasonable’, HMRC’s approach is to look at what a reasonable person with the same attributes and abilities who wanted to comply with their tax obligations would have done in the same circumstances. A reasonable excuse is one that stops a taxpayer from meeting their obligations for a valid reason. In guidance published on the Gov.uk website, HMRC provide the following examples of reasons for a failure to comply which may be accepted as constituting a reasonable excuse:

• The taxpayer’s partner or a close relative died shortly before the tax return or payment deadline.
• The taxpayer had an unexpected stay in hospital which prevented them from dealing with their tax affairs.
• The taxpayer had a serious or life-threatening illness.
• The taxpayer’s computer or software failed while they were preparing their return online.
• The taxpayer experienced issues with HMRC’s online services.
• The taxpayer was prevented from completing their tax return because of a flood, a fire or a theft.
• The deadline was missed due to postal delays which the taxpayer could not have predicted.
• The delay related to a disability or a mental illness which the taxpayer has.
• The taxpayer was unaware of or misunderstood their legal obligations.
• The taxpayer relied on someone else to do their return and they failed to do so.

Where the taxpayer has a reasonable excuse for missing a filing deadline or making a payment, they should rectify this as soon as they are able.

Unacceptable excuses

Like ‘the dog ate my homework’, HMRC do not accept the following excuses as providing a valid reason for missing a filing deadline or failing to make a payment on time:

• A cheque or payment bouncing because the taxpayer did not have enough money in their account.
• Finding the HMRC system too difficult to use.
• Missing the deadline because a reminder was not received from HMRC.
• A mistake was made on the tax return.

The normal filing deadline for the 2024/25 Self Assessment tax return is 31 January 2026. However, if you have some tax to pay under Self Assessment and you also pay tax under PAYE, if you file your return by 30 December 2025, you may be able to pay what you owe through an adjustment to your tax code rather than through the Self Assessment system. This may be the case if, for example, you are employed or receive a pension and also have some income from self-employment or property or you have taxable investment income.

Conditions

Tax due under Self Assessment can only be collected through your tax code if the following conditions are met:

• the total amount that you owe through Self Assessment is £3,000 or less;
• you already pay tax through PAYE (for example, because you are employed or receive a company pension); and
• you filed a paper return by 31 October 2025 or an online return by 30 December 2025.

It should be noted that if the amount you owe is more than £3,000, you cannot make a part payment to reduce the outstanding amount to £3,000 or less and pay the balance through your tax code.

However, even if these conditions are met, you will not be able to pay your Self Assessment tax bill through your tax code if any of the following apply:

• you do not have sufficient PAYE income to collect the amount that is due;
• you would end up paying more than 50% of your income in tax; or
• you would end up paying over twice as much tax as you normally do.

How it works

If you have filed your return by the deadline and you are eligible to pay your tax bill through your tax code, HMRC will automatically adjust your tax code to collect the amount of tax that you owe, unless you indicate that you do not wish to pay your tax in this way. The adjustment will take the form of a deduction from your allowances. The amount of the deduction will depend on how much you owe and your marginal rate of tax. For example, if you pay tax at 40% and owe tax under Self Assessment of £1,000, your allowances will be reduced by £2,500 (40% of £2,500 = £1,000).

The adjustment will be made to your 2026/27 tax code. As a result of the adjustment, you will pay what you owe for 2024/25 in equal instalments throughout 2026/27 each time that you are paid. If you are paid monthly, you will effectively pay your bill in 12 monthly instalments.

Advantages and disadvantages

Paying tax through your tax code allows you to pay it later – instead of having to settle the bill by 31 January 2026, you pay it in equal instalments over the 2026/27 tax year. This provides a cashflow benefit and removes the need to find the funds to pay the bill in one hit.

Paying your bill through your tax code also provides an automatic interest-free instalment plan. Unlike a Time to Pay arrangement, you do not need to set it up, and there is no interest to pay either.

However, having your tax deducted from your pay will reduce your take-home pay, so it may not be for everyone.

If you are new to Self Assessment and need to submit a tax return for 2024/25, you will need to register for Self Assessment. This should be done before 5 October 2025 in order to avoid a penalty and to ensure that you receive your Unique Taxpayer Reference (UTR) and Notice to File in good time. You can either register for Self Assessment yourself or appoint an agent to register on your behalf.

If you register after 5 October 2025, you may receive a failure to notify penalty.

Check whether you need to register

You may need to register for Self Assessment if you do not currently complete a Self Assessment tax return and you had a new source of untaxed income in 2024/25. This may be the case if you started a new trade, which may include a side hustle in addition to your employment, or you started renting out property, either on a long-term let or as holiday accommodation.

However, even if you have a new source of untaxed income, you will not necessarily need to register. This will be the case if, for example, all your income from self-employment (before deductions) is less than £1,000 in the 2024/25 tax year or if your property rental income is less than £1,000 in the tax year. If you let a furnished room in your own home, there is no need to register if your rental income is less than the rent-a-room limit (£7,500 where one person receives the income or £3,750 each where more than one person receives the income).

You can check if you need to send a return by using the tool on the Gov.uk website at www.gov.uk/check-if-you-need-tax-return.

Registered before

If you have previously registered for Self Assessment but did not file a return for 2023/24, you will need to sign into the Government Gateway to reactivate your account. If you are unable to do this, you can instead complete form CWF1 and send this to HMRC.

Register online

If you need to register for Self Assessment, you can do so online by visiting the Gov.uk website at www.gov.uk/register-for-self-assessment. It can take up to  21working days for your registration to be confirmed.

File your return

The deadline for filing your 2024/25 Self Assessment tax return online is midnight on 31 January 2026. Once registered, you can file your return – you do not need to wait until January. If you miss the deadline, you will receive a late filing penalty of £100.

If you did not receive your Notice to File a return until after 31 October 2025 (but you registered for Self Assessment on or before 5 October 2025), you have until three months from the date on the Notice to File in which to file your return.

Pay your tax

You must pay any tax owing for 2024/25 by 31 January 2026. If your tax bill for 2024/25 was more than £1,000, unless 80% of your tax bill for the year was collected at source (such as under PAYE), you will also need to make the first payment on account of your 2025/26 tax liability by the same date. This is 50% of your Self Assessment tax and Class 1 National Insurance bill for 2024/25.

A Simple Assessment is used for taxpayers with very straightforward tax affairs. A taxpayer may receive a Simple Assessment letter from HMRC if they owe income tax that cannot be taken out of their income automatically, they owe HMRC more than £3,000 or they have tax to pay on their state pension. A person may also receive a Simple Assessment letter if they have tax to pay on their bank or building society interest.

A Simple Assessment letter will be sent by post and, where the taxpayer has a personal tax account, to their personal tax account. The letter will show the person’s taxable income, such as that from employment income, a state pension or investments, any income tax that they have already paid (for example, under PAYE) and the balance that they owe.

If you receive a Simple Assessment letter, it is important that you check that the figures shown on it are correct. For example, you can check that the figure for your employment income matches that shown on your P60. If you do not agree with the figures shown or the calculation, you should contact HMRC within 60 days of the date on the letter.

If you receive a Simple Assessment but you complete a Self Assessment tax return, you should contact HMRC (on 0300 200 3300) within 60 days of the date of the letter to get the Simple Assessment withdrawn.

Paying the bill

The deadline for paying a Simple Assessment bill depends on the date on which the letter is received. If a Simple Assessment letter for 2024/25 is received before 31 October 2025, the tax owing must be paid by 31 January 2026. However, if the letter is not received until after 31 October 2025, the tax must be paid within three months of the date on the letter.

The tax due can be paid online, by bank transfer or by cheque.

Help to pay

Taxpayers who will struggle to pay their Simple Assessment bill by the due date can now spread the cost and pay in instalments by setting up a Time to Pay arrangement. A taxpayer can set up a Simple Assessment payment plan online if they owe between £32 and £50,000 and do not have any other payment plans or debts with HMRC.

Taxpayers within Simple Assessment who want to pay in instalments but are not able to set up a plan online will need to contact them to see if they can agree an instalment plan with them.

Where an instalment plan is agreed, interest is charged on tax paid after the due date, but there are no late payment penalties.

Businesses must register for VAT when their turnover exceeds the registration threshold (currently £90,000). This must be done if, at the end of any month, the taxable supplies in the previous 12 months or less exceed the registration threshold or if the business expects that in the next 30 days alone their turnover will exceed the registration threshold.

Businesses whose turnover does not reach the threshold do not need to register; however, they may choose to do so voluntarily. This can be advantageous, for example, if they make zero-rated supplies but buy goods or services which are liable for VAT at the standard or reduced rate as it will enable them to recover the VAT suffered.

Start date

When a business registers for VAT voluntarily, they can choose the date from which their VAT registration takes effect. It is important that this date is chosen carefully as once the VAT registration is effective, the business can recover VAT incurred from that date but must also charge VAT on taxable supplies that it makes from that date. It is not possible to recover VAT incurred on purchases prior to the date of registration, so if the business is planning a large purchase on which they hope to recover the VAT, they should ensure that their VAT registration is effective before making the purchase.

A business can apply for their voluntary registration to be backdated by up to four years from the date that they register for VAT. Where the registration is backdated, the business will be able to recover VAT charged on taxable supplies from that date. On the flip side, the business must also account for VAT at the correct rate on all taxable supplies made on or after that date.

Amending the registration date

It is important that businesses voluntarily registering for VAT consider carefully when they want their registration to take effect as there is no automatic right to change it and there is no right of appeal if HMRC deny a request to amend the effective date of registration. Where a mistake is made in choosing the effective date of registration and this affects the pre-registration cost calculations of what the business can recover and what the business must account for, HMRC will not normally allow the registration date to be changed.

Individuals who claim higher or additional rate relief for personal pension contributions through their tax code may now need to provide evidence in support of their claim where previously they did not need to do so. HMRC changed the rules as regards the provision of supporting evidence with effect from 1 September 2025. From the same date, HMRC ceased accepting claims by telephone; claims now must be made online or by letter.

Taxpayers who complete a Self Assessment tax return must make their claim in their tax return rather than by this route.

Eligibility

A person is eligible to claim relief if they pay tax at a rate higher than the basic rate, for example, at the higher or additional rate or, in Scotland, at the intermediate rate or above, and pay into a pension scheme where they receive tax relief at the basic rate of tax. Basic rate taxpayers who pay into a workplace pension scheme where the employer does not or will no longer claim tax relief can also make a claim, as can basic rate taxpayers who pay a lump sum into a personal or workplace pension where the scheme is not a net pay scheme (i.e. one where pension contributions are deducted from gross pay).

Information required

In order to make a claim, the claimant will need the following information:

• their National Insurance number;
• the type of pension that they have;
• the name of their pension provider;
• the net amount of pension contributions for each tax year in respect of which they are claiming tax relief; and
• their payroll number or reference (where applicable).

Supporting evidence

The claimant will also now need to provide evidence in support of their claim for each tax year for which relief is claimed. The evidence could be in the form of a letter or statement from their pension provider or a pay slip from their employer. It must include:

• the claimant’s full name;
• details of pension contributions paid in the tax year to which the claim relates; and
• where the claim relates to a workplace pension, evidence that they have received basic rate relief (20%) automatically from their employer.

Making a claim

HMRC prefer claims to be made online. This can be done by visiting the Gov.uk website (see www.gov.uk/guidance/claim-tax-relief-on-your-private-pension-payments). Where the claimant is unable to claim online or the claim is made by an agent on the claimant’s behalf, the claim should be made by letter. The information and evidence set out above should be included with the letter.

HMRC should contact the claimant within 28 working days.

Claims can be amended once submitted, for example, to provide details of another pension. Where the claim was made online, the claim details can be amended online. If the claim was made by letter, the taxpayer must send a further letter setting out details of the changes.