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ACCA Strategic Professional · Advanced Taxation (UK)

National Insurance Contributions for Employed and Self-Employed Persons

National insurance contributions (NIC) are UK charges on earnings and benefits. Employees and employers pay Class 1, employers pay Class 1A on benefits, and the self-employed pay Class 4 on profits. To solve NIC questions, identify the class, apply the right thresholds and rates from the tax tables, then compare total cost.

What this chapter covers

This chapter covers the NIC that sit beside income tax in almost every ATX-UK scenario. You meet Class 1 primary (employee) and secondary (employer) contributions, Class 1A on benefits in kind, Class 1B on PAYE settlement agreements, the employment allowance, Class 4 for the self-employed, and the voluntary Class 2 and Class 3 contributions. You finish with planning: employed versus self-employed, and how to pay the owner of a business.

The key skill is choosing the correct class for the correct person on the correct amount. Employees pay Class 1 primary: nil on earnings of £1 to £12,570, 8% on £12,571 to £50,270 and 2% above that, per year. Employers pay Class 1 secondary at nil up to £5,000 and 15% above. Class 1A is 15%. Class 4 is nil up to £12,570, 6% from £12,571 to £50,270 and 2% above. Always take the figures from the tax tables ACCA provides in the exam.

This chapter links to many others. Benefits in kind come from the employment income chapter, and the car benefit percentage drives Class 1A. Trading profits and capital allowances feed Class 4. Pension contributions, owner-manager remuneration and incorporation decisions all need an NIC comparison. In Section A you often have to advise on the total tax and NIC cost of a choice, so this chapter supports your commercial advice.

NIC are a regular source of technical marks because they appear inside larger questions on employment, benefits, self-employment and owner-managers. The calculations are short and rule-based, so they are marks you can bank if you know which class applies. Planning questions also reward professional skills: you compare options, show the full cost to both employer and individual, and give clear, reasoned advice. Missing NIC from a comparison is a common way to lose marks on an otherwise good answer.

National insurance contributions for employed and self-employed persons: topics in the order to study them

  1. 1Class 1 Primary and Secondary NICThis is the core charge on earnings. The thresholds and rates here are the base for every later topic.
  2. 2Class 1A NIC on Benefits in KindIt builds on Class 1 and on benefit valuation, and it is the most common NIC calculation in employment questions.
  3. 3Class 1B NIC and PAYE Settlement AgreementsIt follows Class 1A because a settlement agreement deals with similar items, so you can compare the two.
  4. 4Employment AllowanceLearn this once you know employer Class 1 secondary, since it reduces that employer liability.
  5. 5Class 4 NIC for the Self-EmployedNow move to self-employed persons. Class 4 is based on trading profits, not on earnings from employment.
  6. 6Class 2 and Class 3 NIC Voluntary ContributionsThese are smaller points that sit alongside Class 4 and mainly matter for protecting benefit entitlement.
  7. 7NIC Planning: Employed vs Self-Employed and RemunerationDo this last. It needs every class, and it is where you compare costs and advise.

How to prepare National insurance contributions for employed and self-employed persons

NIC marks come from choosing the right class and applying the right band. Build that habit first, then add planning.

  1. Learn which class applies to whom: Class 1 primary to employees, Class 1 secondary and Class 1A to employers, Class 4 to the self-employed.
  2. Open the tax tables and read the NIC table until you can find each rate and threshold quickly. Do not memorise figures that are given to you.
  3. Practise banded calculations. Split earnings into the nil, 8% and 2% bands for employees, and the nil and 15% bands for employers.
  4. Link Class 1A to benefits: value the benefit first, such as a car benefit, then apply the 15% rate.
  5. Do Class 4 questions after you have computed the trading profit, so you practise the full chain from profit to tax and NIC.
  6. Write full cost comparisons for owner-managers and for employed versus self-employed choices. Show employee, employer and total cost.
  7. Finish with timed Section A style questions and check that you gave a clear recommendation and stated your assumptions.

Common mistakes in National insurance contributions for employed and self-employed persons

  • Using the wrong class of NIC for the person.

    Fix: Before calculating, write who pays and on what: earnings, benefits or profits. Then pick the class.

  • Applying the rate to the whole amount instead of the correct band.

    Fix: Draw the bands and calculate each slice separately. Check that the thresholds come from the tax table.

  • Forgetting employer NIC in cost comparisons.

    Fix: In planning questions, always compute employer cost as well and show the total.

  • Ignoring the employment allowance, or applying it where it is not available.

    Fix: Check the employer's facts and whether Class 1 secondary is due. Apply the allowance against that liability only, up to £10,500.

  • Calculating Class 1A on the wrong benefit figure.

    Fix: Value each benefit carefully using the tables, total them, then apply 15%.

  • Giving numbers with no advice.

    Fix: Finish with a reasoned recommendation, note other factors and state your assumptions.

Last-day revision: National insurance contributions for employed and self-employed persons

  • Class 1 primary is paid by the employee: nil on £1 to £12,570, 8% on £12,571 to £50,270, 2% above.
  • Class 1 secondary is paid by the employer: nil up to £5,000, then 15%.
  • Class 1A is 15% and is paid by the employer only, on benefits in kind.
  • Class 4 is paid on trading profits: nil up to £12,570, 6% to £50,270, 2% above.
  • The employment allowance is £10,500 and reduces the employer's Class 1 liability.
  • Class 1A is based on the benefit value, so get the benefit calculation right first.
  • Car benefit for a zero-emission electric car uses a 3% percentage.
  • Class 1B and PAYE settlement agreements deal with specific items the employer agrees to settle for the employee.
  • Use the thresholds in the exam tax tables; do not rely on memory.
  • In planning questions, include both employee and employer NIC in the total cost.
  • State your assumptions and give a clear recommendation in advice questions.

National insurance contributions for employed and self-employed persons practice questions

National insurance contributions for employed and self-employed persons in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

National insurance contributions for employed and self-employed persons: frequently asked questions

Do I need to memorise the NIC rates for ATX-UK?

No. ACCA provides the tax rates and allowances, including the NIC table, in the exam. You need to know how to use them and which class applies.

What is the difference between Class 1 and Class 4 NIC?

Class 1 applies to earnings from employment and is paid by both employee and employer. Class 4 applies to the profits of the self-employed and is paid only by the individual.

Who pays Class 1A NIC?

The employer pays Class 1A, at 15%, on most benefits in kind provided to employees. The employee does not pay it.

How does the employment allowance work?

It is £10,500 and reduces an employer's Class 1 secondary liability. Always check whether the employer is eligible in the scenario before using it.

How should I answer an employed versus self-employed question?

Calculate income tax and all relevant NIC for each option, including employer NIC where it applies. Then compare total costs, state your assumptions and give a clear recommendation.