
National Insurance (NI) is a UK tax on income, alongside income tax. It is paid by employees, the self-employed, and employers. National Insurance contributions help build entitlement to certain benefits, including the State Pension and Maternity Allowance. The amount of personal allowance you have affects when you start paying income tax. If you earn above the threshold, your personal allowance is reduced by £1 for every £2 you earn above it, until it reaches £0. This means that personal allowance affects when you start paying National Insurance.
| Characteristics | Values |
|---|---|
| Personal Allowance | Amount of money you're allowed to earn each tax year before you start paying Income Tax |
| Who gets Personal Allowance | Everyone, including students |
| Personal Allowance for 2025/26 tax year | £12,570 |
| Personal Allowance for self-employed | £12,570 |
| Personal Allowance for Marriage Allowance or Blind Person's Allowance | More than £12,570 |
| Personal Allowance for high earners | Less than £12,570 |
| Personal Allowance for those who owe tax from a previous tax year | Less than £12,570 |
| National Insurance | Second-biggest tax in the UK |
| Who pays National Insurance | Employees, self-employed, and employers |
| National Insurance for self-employed | Class 4 contributions |
| National Insurance threshold | Up to a certain threshold, earnings are free of NICs |
| National Insurance for students | Applicable if they earn more than £242 a week |
| National Insurance for self-employed students | Applicable if they have self-employed profits of more than £12,570 a year |
| National Insurance for self-employed with profits below £6,845 | Voluntary Class 2 contributions of £3.50 per week |
| National Insurance for those with earnings above £50,270 | Contributions on any earnings above this level will reduce to 2% |
| National Insurance for those reaching state pension age | 35 full years of contributions to receive the full new state pension, with a minimum of 10 years to get anything |
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What You'll Learn

Personal allowance and National Insurance thresholds
Personal Allowance is the amount of money one can earn annually before starting to pay Income Tax. For the 2025/26 tax year, the Personal Allowance is £12,570. If you earn less than this amount, you usually don't have to pay any Income Tax. Your Personal Allowance might be bigger if you claim Marriage Allowance or Blind Person's Allowance. Conversely, it might be smaller if you're a high earner or if you owe tax from a previous tax year.
National Insurance contributions (NICs) are the UK's second-biggest tax, with employees and the self-employed paying it on their earnings, and employers paying it on the earnings of those they employ. Up to a certain threshold, earnings are free of NICs. The main rates are payable on earnings above that level, but the employee and self-employed rates – though not the employer rate – are lower on earnings above a higher threshold. The amount of NICs paid helps build one's entitlement to certain benefits, including the State Pension and Maternity Allowance.
In 2024, the starting rate for NI for 27 million employees fell twice, from 12% to 10%, and then again to 8%. The previous Conservative government froze the NI threshold and tax-free personal allowance at £12,570 until 2028. This means that more people will start paying tax and NI as their wages increase, and more people will pay higher rates.
The link between contributions and benefits has weakened over time, to the point where there is now barely any connection at all between the amount of NICs paid and the amount of benefit received.
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National Insurance contributions and benefits
National Insurance contributions (NICs) are a direct tax paid by employees and the self-employed once their earnings reach certain thresholds. Employers also pay NICs on their employees' earnings. NICs are charged separately for each pay period and for each different job. This means that two people with the same income but structured differently may pay different amounts in NICs.
The amount of NICs paid helps build entitlement to certain benefits, including the State Pension, which is the biggest of these benefits. Other benefits include 'new-style' jobseeker's allowance, 'new-style' employment and support allowance, and Maternity Allowance. There is a link between someone's record of paying NICs and their entitlement to contributory benefits, but the amount of NICs paid does not determine the value of contributory benefits that can be claimed.
NICs are only charged on earnings from employment and profits from self-employment, while income tax is applicable to other types of income, such as investment income. NICs are payable by people over 16 and under State Pension age. Employees stop paying Class 1 National Insurance when they reach State Pension age, while the self-employed stop paying Class 4 National Insurance from the start of the tax year after reaching State Pension age.
The rates and thresholds for National Insurance contributions change over time. For example, the starting rate for employees fell twice in 2024, from 12% to 10%, and then to 8%. For the self-employed, Class 4 NICs on earnings between £12,570 and £50,270 fell from 9% to 6%. The employment allowance, which is the amount employers can claim back from their NI bill, increased from £5,000 to £10,500. These changes will result in more tax revenue for the government.
While NICs are often thought to be ring-fenced for funding the NHS and contributory benefits, the reality is more complex. A portion of NICs revenue goes directly to the NHS, but this is topped up from general taxation. The remaining NICs revenue goes into the National Insurance Fund (NIF), which is supposed to be financially separate from other government funds. However, in years when the NIF is insufficient to finance benefits, it is topped up from general taxation revenues, and in years of surplus, it is used to reduce the national debt.
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National Insurance for the self-employed
National Insurance is a mandatory contribution for most UK workers between the ages of 16 and their retirement age. The amount of National Insurance (NI) paid varies depending on one's employment status and income level. Self-employed individuals have a more complex NI calculation process than traditional employees, and there are several key factors that they need to consider.
Firstly, self-employed individuals need to determine their profits by deducting expenses from their self-employed income. This profit calculation serves as the basis for assessing the applicable NI class and contribution rate. It is important to note that self-employed workers may fall under different NI classes, with Class 2 and Class 4 being the most common. Class 2 contributions are treated as having been paid to protect one's NI record, even if no actual payment is made. On the other hand, Class 4 contributions are mandatory when self-employed profits exceed a certain threshold, which was £12,570 per year for the 2024/25 financial year.
The contribution rates for Class 2 and Class 4 NI vary. For the 2024/25 tax year, the Class 2 rate was £3.45 per week. Class 4 contributions are calculated as a percentage of profits that fall within a specified range. For example, for the 2024 tax year, a rate of 6% was applied to earnings between £12,570 and £50,270. It is worth noting that self-employed individuals can also make voluntary NI contributions to fill or avoid gaps in their record, ensuring they remain eligible for certain benefits, including the State Pension.
The process of paying NI contributions for the self-employed is typically done through self-assessment. This involves submitting a tax return by the deadline, usually 31 January, and paying the calculated NI amount. Self-employed individuals need to inform HM Revenue and Customs (HMRC) of their status, and they will receive guidance on the applicable NI contributions after filing their tax return. In some cases, self-employed workers may also have a separate employment, in which case their employer will deduct Class 1 NI contributions from their wages.
Understanding the intricacies of NI contributions for the self-employed is crucial for proper tax planning and ensuring compliance with HMRC regulations. Self-employed individuals should stay informed about any changes to NI rates and thresholds, which can occur annually, and consult official sources or seek professional advice to make informed decisions regarding their NI obligations.
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Personal allowance and income tax
Personal allowance is the amount of money you’re allowed to earn each tax year before you start paying Income Tax. For the 2025/26 tax year, the personal allowance is £12,570. If you earn less than this amount, you usually don't have to pay any income tax. Your personal allowance might be bigger if you claim Marriage Allowance or Blind Person’s Allowance. On the other hand, your personal allowance might be smaller if you’re a high earner or if you owe tax from a previous tax year.
If you earn over £100,000, the figure of £12,570 will be reduced by £1 for every £2 earned over the £100,000 limit. This means that if you earn £125,140, you pay income tax on your entire income and there’s no tax-free allowance. In this case, an additional rate of income tax of 45% is paid on all earnings above £125,140 a year. These rates apply in England, Wales and Northern Ireland. Some income tax rates are different in Scotland, where a new 45% band took effect in April 2024.
If you’re self-employed, income tax is paid at the same rate as everyone else. However, you pay it a year in arrears through self-assessment. Additionally, you might also make National Insurance contributions. These help build your entitlement to certain benefits, including the State Pension and Maternity Allowance.
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National Insurance and state pension
National Insurance contributions are used to calculate your entitlement to certain benefits, including the State Pension. The State Pension is based on your National Insurance record when you reach your state pension age. The number of qualifying years you need on your record depends on when you reach pension age and whether you are claiming the new state pension or the basic state pension.
The new state pension is for those who reached or will reach state pension age on or after 6 April 2016. To get the full new state pension, you usually need 35 qualifying years. The basic state pension is for those who reached state pension age before 6 April 2016. The number of qualifying years needed varies between 30 and 44.
You can increase the number of qualifying years on your National Insurance record by making voluntary contributions. This can be useful if you do not pay enough National Insurance on your earnings. The amount of State Pension you receive is proportional to your contributions. For example, if you have 20 years of full contributions, you will get 57% of the full amount.
It is important to note that if you were a member of the LGPS, you were previously ''contracted out' of the additional State Pension and received a rebate on your National Insurance contributions. This means that you paid lower National Insurance contributions and were not building up the additional State Pension. From 6 April 2016, the new State Pension replaced the existing basic and additional State Pensions with a single-tier, flat-rate State Pension. As a result, the rebate on scheme members' National Insurance contributions ceased. If you were eligible for the new State Pension, you might not receive the full amount due to having paid lower National Insurance contributions in previous years.
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Frequently asked questions
The personal allowance is the amount of money you’re allowed to earn each tax year before you start paying Income Tax. For the 2025/26 tax year, the Personal Allowance is £12,570.
National Insurance contributions (NICs) are paid by employees and the self-employed on their earnings. Up to a certain threshold, earnings are free of NICs. The personal allowance is the same as the tax-free NIC threshold.
The NIC threshold is £12,570. If you earn above this, your Personal Allowance is reduced by £1 for every £2 you earn above it, until it reaches £0.
Yes, if you are self-employed, you will pay Class 4 contributions. The amount you have to earn to start paying Class 4 contributions is the same as the tax Personal Allowance, £12,570.
NICs help build your entitlement to certain benefits, including the State Pension, Maternity Allowance, and new-style jobseeker’s allowance.























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