
National Insurance contributions are calculated based on different earnings thresholds, which are subject to change each tax year. National Insurance is a tax that is paid by employed or self-employed workers in the UK, and the type of National Insurance paid is determined by one's employment status. Employees who earn between £6,396 and £12,570 a year do not need to pay National Insurance but still get the benefits of paying, such as building up their state pension. If you're self-employed, you'll pay Class 2 and/or Class 4 National Insurance, depending on your trading profits. National Insurance contributions will be calculated based on your Self Assessment tax return.
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What You'll Learn

Self-employed workers
For self-employed workers in the UK, calculating National Insurance rates can be more complex than it is for standard employees. The amount of National Insurance contributions (NICs) you pay will depend on your profits, and there are several classes of NICs that apply to different types of employment.
Class 2 NICs are paid by self-employed sole traders on profits over the Small Profits Threshold. For the 2024/25 tax year, this rate is £3.45 per week for profits over £6,725. If your profits are below this threshold, you can make voluntary Class 2 contributions to maintain your entitlement to state benefits. If your profits are above £12,570, you must pay Class 4 NICs, which are calculated based on your self-assessment return filed with HM Revenue and Customs (HMRC).
If you are both employed and self-employed, you may need to pay both Class 1 and Class 4 NICs. Your Class 1 contributions will be deducted from your wages by your employer, and your Class 4 contributions will depend on your combined wages and self-employed work. If you pay the maximum amount of annual NICs through Class 1, you may not need to pay the full amount of Class 4 NICs.
It's important to note that the rules and thresholds for National Insurance contributions can change over time, so it's always a good idea to refer to the most up-to-date information from official sources, such as HMRC or government websites. Online calculators and guides can also help you understand and calculate your specific National Insurance contributions as a self-employed worker.
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Voluntary contributions
Voluntary National Insurance contributions are a way to boost your pension entitlement and secure your eligibility for various benefits. To receive any UK state pension, you need a minimum of 10 qualifying years of contributions, and 35 years for the full pension. Each qualifying year is 52 weeks of paying contributions into a "class". Voluntary contributions can be made to fill gaps in your record, with a time limit of 6 years.
There are four classes of National Insurance contributions, but only Class 2 and Class 3 are relevant to voluntary contributions. Class 2 contributions are for expats living and working abroad, but only if they worked in the UK immediately before leaving and have previously lived in the UK for at least three years in a row or paid at least three years of contributions. Class 3 contributions are for those who are not eligible for Class 2, have gaps in their payment record, or are unemployed while living abroad.
The cost of voluntary contributions varies depending on the class. For 2023/24, Class 2 contributions are £3.45 per week or £179.40 per year. Class 3 contributions are £17.45 per week or £907.40 per year. It's important to note that it can take several years to recoup your contributions, so it's worth considering how long you may receive State Pension payments.
Before making voluntary contributions, it is recommended to check your National Insurance record and verify your eligibility for any free alternatives, such as NI credits, transfer credits from child benefit, or pension credit. Voluntary contributions may be particularly relevant to self-employed individuals or those employed overseas.
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Employee benefits
National Insurance contributions (NICs) are a legal requirement for employers in the UK and are compulsory for businesses with employees earning above specified thresholds. NICs are paid on top of an employee's wages and are calculated based on earnings thresholds. NICs fund services like the NHS, state pensions, and other social security benefits. Employers pay 13.8% on earnings above the threshold, and this will increase to 15% from April 2025.
As an employer, you must also pay NICs on any employee benefits and expenses, known as Class 1A and 1B NICs. These are paid once a year and are calculated as 15% of the value of the benefits provided. Benefits that are covered include company cars, private health insurance, long-service incentives, telephone bills, relocation expenses, shared cars, work phones, accommodation, and bonuses.
It is important to understand which benefits are subject to NICs and how they are calculated, as offering employee benefits can affect your National Insurance obligations. Employers can use calculators and tables to check employees' National Insurance and stay compliant with regulations. Additionally, payroll software solutions can simplify the process of managing National Insurance contributions and ensure compliance with HMRC regulations.
Furthermore, employers should be aware of special cases, such as employees under 21 and apprentices under 25, who are exempt from Class 1 secondary contributions on earnings up to a certain limit. Directors also have a different NI calculation method, with contributions calculated on their annual income rather than weekly or monthly earnings.
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Payroll software
As an employer, you can use payroll software to automate the calculation of your employees' National Insurance contributions. This saves time and reduces the risk of errors. It is important to ensure that your payroll software is up-to-date with the latest tax year rates and thresholds, as tax laws and National Insurance thresholds are subject to change.
To use payroll software for National Insurance calculations, you need to input the correct employee information, including their category letter. Employees are assigned a category letter that reflects their National Insurance rate, which depends on their circumstances, such as age, employment type, and pension scheme enrolment. By using the correct category letter, you can ensure accurate calculations of National Insurance contributions.
It is worth noting that offering employee benefits can affect your National Insurance obligations. Certain benefits-in-kind, such as company cars or private health insurance, are subject to Class 1A contributions at a rate of 13.8%. Salary sacrifice schemes can also impact National Insurance contributions by reducing an employee's gross pay. Therefore, it is essential to understand which benefits are subject to National Insurance contributions and how they are calculated.
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State pension
The State Pension is a taxable state benefit paid by the government to certain people who have reached state pension age. The amount of State Pension one can claim depends on their National Insurance record. The State Pension is calculated based on the number of qualifying years of National Insurance contributions. A 'qualifying year' is a year when sufficient National Insurance contributions (NICs) have been paid.
The number of qualifying years required to receive the full State Pension differs depending on the type of State Pension being claimed. For the basic State Pension, the number of qualifying years needed varies between 30 and 44. On the other hand, the new State Pension, which applies to those who reached State Pension age on or after 6 April 2016, requires 35 qualifying years to receive the full amount.
If an individual has fewer than the required number of qualifying years, they will receive a reduced State Pension amount. For the basic State Pension, the full rate is £176.45 per week, and for every qualifying year an individual has, they will receive 1/30th of this amount. For example, if a person has 20 qualifying years, they will receive £117.63 per week. For the new State Pension, the full rate is £230.25 per week, and for every qualifying year, an individual will receive 1/35th of this amount. For instance, if a person has 20 qualifying years, they will receive £131.57 per week.
It is important to note that individuals who were ''contracted-out' of the additional State Pension may receive a lower amount. This means that they paid a lower rate of NICs and may have earned replacement pension benefits from an employer scheme or a personal pension. Additionally, those who have lived or worked abroad may be eligible for a State Pension from that country as well as the UK State Pension.
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Frequently asked questions
National Insurance contributions are calculated based on different earnings thresholds, which are subject to change each tax year. As of the 2024/2025 tax year, the primary threshold is £242 per week for weekly paid employees, which is the point at which employees start to pay National Insurance.
The primary threshold is the point at which employees start to pay National Insurance. For weekly paid employees, this is £242 per week as of the 2024/2025 tax year.
Yes, self-employed people have to pay National Insurance contributions. They pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% on profits over £50,270.
You can use a National Insurance calculator to work out how much you need to pay based on your employment status and yearly earnings.
Yes, employers pay different rates of National Insurance depending on their employees' category letters. Employees are assigned a category letter that reflects their National Insurance rate, depending on their circumstances (e.g. age, employment type, and pension scheme enrolment).





















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