Employees with company cars may be paying unnecessary tax on private fuel, when reimbursing the cost of private fuel in full can often remove the car fuel benefit charge altogether.

Where an employee is provided with a company car and fuel for private use, the default position is that the employee must pay the car fuel benefit charge. The amount of the charge is calculated based on the car’s CO2 emissions and applied to the car fuel benefit multiplier, which is currently £28,200 and is set to increase to £29,200 for the 2026–27 tax year.

Avoiding the car fuel benefit charge is possible if the employee reimburses their employer for all fuel used for private journeys, a process known as ‘making good’. Private fuel includes all fuel used for commuting to and from work. To do this, employees should keep a record of private mileage and repay their employer using the published advisory fuel rates. These rates are designed to reflect average fuel costs and are updated quarterly.

If properly documented, HMRC will accept that no car fuel benefit charge is due, meaning the employee avoids the income tax liability on the private fuel. In most cases, reimbursing the employer is far cheaper than paying the tax, especially for employees with relatively low private mileage.

The car fuel benefit charge will still apply if it cannot be demonstrated to HMRC that the employee has reimbursed the full cost of fuel used for private journeys, including commuting. To prevent this, employees must maintain a detailed log of private mileage and ensure they make good the cost of all fuel provided for private use.

With the 31 January deadline approaching, thousands of taxpayers are using HMRC’s Time to Pay service to spread the cost of their self-assessment tax bill rather than facing immediate payment pressure.

HMRC has reported that thousands of people have set up payment plans to help spread the cost of their self-assessment tax bill. Taxpayers with outstanding tax liabilities, may be eligible to receive support with their tax affairs through HMRC’s ‘Time to Pay’ service. Almost 18,000 self-assessment payment plans were set up between 06 April 2025 and 30 November 2025. The deadline to file and pay any tax owed for the 2024-25 tax year is 31 January 2026.

If you owe tax to HMRC, you may be able to set up an online ‘Time to Pay’ payment plan depending on the type of tax debt and your circumstances. For self-assessment, you can create a payment plan online if you’ve filed your latest tax return, owe £30,000 or less, are within 60 days of the deadline and have no other debts or payment plans with HMRC.

A Time to Pay arrangement cannot be set up until a self-assessment return has been filed. If the tax owed is more than £30,000, or a longer repayment period is needed, people can still apply but will need to contact HMRC directly. HMRC will typically ask for details about your income, expenses, other tax liabilities, and any savings or assets, which they may expect you to use toward your debt.

HMRC will usually only offer taxpayers the option of extra time to pay if they think they genuinely cannot pay in full now but will be able to pay in the future. If HMRC do not think that more time will help, then they can require immediate payment of a tax bill and start enforcement action if payment is not forthcoming.

Writing-down allowances (WDAs) are a type of capital allowance that let you deduct a percentage of an asset’s value from your taxable profits each year. In some cases, you may be able to claim more relief using other capital allowances, such as the Annual Investment Allowance or first-year allowances.

There are two rates of WDA for plant and machinery. To calculate them, you first group your expenditure into separate pools:

• the main pool – this includes expenditure on most items – the rate is 18%; and
• the special rate pool includes special rate expenditure including long-life assets, integral features, certain thermal insulation and some cars – the rate is 6%.

Assets are grouped into pools, and WDAs are applied to the balance of each pool after adding new purchases, deducting disposal and accounting for any private use.

The Small Pools Allowance provides an alternative to WDAs. If the balance in the main or special rate pool is £1,000 or less, you can claim the entire amount in one year rather than applying the WDA percentage. The Small Pools Allowance cannot be used for single-asset pools and is prorated for accounting periods shorter or longer than 12 months. You can choose between claiming WDAs or the Small Pools Allowance, where possible, but cannot claim both.

Students that work may need to pay Income Tax and National Insurance. Employers are required to calculate the amount of tax they need to pay on the basis that the students would be working for the rest of the tax year.

This means that an overpayment of income tax can often occur when a student or temporary worker earns more than their monthly tax-free allowance of £1,048 but over the course of the tax year earn less than their annual allowance. For example, a student only working over the summer and / or Christmas period and earning more than £1,048 a month may not have exceeded the current £12,570 tax free personal allowance. Students (and other temporary workers) are not required to pay any Income Tax if their earnings are below the tax-free personal allowance, currently £12,570.

A refund of overpaid tax can be requested online or using form P50 entitled Claim for repayment of tax. You can check your eligibility to make a claim for current or past tax years at https://www.gov.uk/claim-tax-refund/y

A refund claim for the current tax year can only be made if you meet the necessary conditions. Any students that are continuing to work for the rest of the tax year in part-time jobs should consider waiting until the end of the tax year in order to make a claim.

As an employee, you pay tax on certain company benefits, such as cars, accommodation, and loans. Your employer calculates the tax you owe and deducts it through Pay As You Earn (PAYE). The amount of tax depends on the type and value of the benefit.

Some company benefits are tax-free, including childcare support and meals provided in canteens. Cash payments, however, are treated as earnings and are always subject to tax and National Insurance contributions.

Other taxable benefits you will pay tax on include the following:

Medical Insurance

You usually pay tax on the cost of the insurance premiums if your employer pays for your medical insurance. However, some health benefits are tax-free, including medical insurance while you are working abroad and annual check-ups.

Loans

You may have to pay tax on low-interest or interest-free loans from your employer if the loan is more than £10,000. The tax is calculated on the difference between the interest rate you pay and the official rate of interest set by the Bank of England. You could also be liable for tax if your employer lends money to one of your relatives.

Living Accommodation

If you (or one of your relatives) lives in accommodation provided by your employer, you may need to pay tax. The calculation depends on whether the accommodation costs are more than £75,000. You might not have to pay tax if the accommodation is provided so you can perform your job or do it more effectively, for example, agricultural workers living on farms.