Chris Priebe
11 Jun 2022

How to calculate employee National Insurance deductions (2023/24)

As an employer, you are responsible for deducting employee NI contributions from your employees’ salaries Use our calculator to know exactly how much you need to contribute for NI. Use this NI calculator to calculate how much NI contributions you need to deduct.

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To see and check how these values are calculated, you can download this calculator as a spreadsheet by filling in your details in receiving it as an email attachment. If you find any mistakes or have suggestions how we can improve it, please reach out to

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Latest National Insurance rate changes

From April 6 2024 the base NI rates were lowered from 12% to 10%. The NI thresholds remained at £12,570.

The National Insurance categories

There are 8 employee National Insurance categories that determine an employee’s NI contributions rates and the thresholds relevant for their NI-free allowance. This table covers the most relevant categories:

NI Category

Employee Group


Category A covers all employees except those in categories B, C, H, J, M, V and Z. Most employees fall under category A


Married and widowed women who are eligible for reduced NI contributions


Employees who are over the State Pension age


Apprentices under the age of 25


Employees who are paying their NI contributions through another job


Employees under the age of 21


Army Veterans in their first employment


Employees under the age of 21 who are also paying their NI contributions through another job

How to calculate employee NI deductions

Different to employer NI contributions, where there is only one rate and one threshold, employee NI deductions take into account two different thresholds and contribution rates, a higher one and a lower one.

This has the effect that – for most NI category letters – deductions for every additional 1£ earned above the higher threshold of £50,268 per year increases deductions only c. 1/4 as much as income below that level, benefiting high earners.

Employee NI deduction rates

Calculating employee NI deductions is following a simple formula. Employees pay 0% on income below their monthly allowance and a certain rate on income that falls between the two thresholds and above the upper threshold. Starting from 6 January 2024 the following NI contributions rates for employee deductions are effective.

Category Letter


(up to £1,048)

Threshold 1

(£1,048 to £4,189)

Threshold 2

(Over £4,189)

A, F, H, M, V

(most employees)




B, I




J, L, Z




Formula to calculate employee NI deductions

For employees with NI categories A, F, H, M and V that means employee NI deductions are calculated according the formula below. To adjust the formula with employee of other categories you just need to replace the rates in the formula with those shown in the table above. + 0%. + Income below £1,048 + 10% + Income between £1,048 and £4,189 + 2% + Income above £4,189🟰 Employee NI deduction

Table with employee NI deductions at different annual salaries

You can find below the annual employee NI deductions for salaries from £20,000 to £80,000 per annum, and for different NI classes. In this table, we’ve taken into account the increased NI contributions rates effective 6 April 2024.

​Annual Salary

A, F, H, M, V

(10% + 2%)

B, I

(3.85% + 2%)

J, L, Z






















































Employee benefits and some expenses also require NI deductions

National Insurance is also payable on any employee benefits or expenses. Employers must report and pay this particular NI liability at the end of the tax year. You must pay NI on benefits such as work phones, accommodation, and bonuses. Note that every expense and benefit is calculated differently, so you need to check on what you’re required to report and pay.

You can use this benefit in kind calculator to determine how much NI you need to pay for a benefit based on its value.

You have to complete a P11D form for every employee that you have given benefits or expenses to and return it to HMRC. It is possible to deduct and pay class 1A NI through your payroll as long as you remember to register with HMRC before the beginning of the tax year.

Directors of Limited Companies

Company directors also need to pay NI contributions on any income over £9,880 as they are also considered employees . NI liability is calculated from annual earnings but is paid in accordance with your applicable payroll schedule. Even if you’re the only employee of your company and you’re the director, your company will still need to pay NI on your salary.

2023 & The Social Care and Health Levy

Employers need to make sure that their payroll software will automatically take into account the new Social Care and Health Levy, which will be introduced in April 2023. For this, you need to include the levy as a separate item in payslips. Employees that are over the State Pension age will also pay the levy.

You also have to pay to employer NI contributions?

Besides deduction NICs from employee pay, employers also contribute NICs on top. The following table shows a summary of the contributions and thresholds and you can use this employer NI contributions calculator to understand how much NIC you need to pay.

NI category

Income Threshold

(from 6 August 2022)

Employer NI on Earnings up to threshold

Employer NI on Earnings above threshold

A, B, C, J

(most employees)

£758 pm

(£175 pw)



H, M, V, Z

(youngsters, veterans)

£4,189 pm

(£967 pw)



Final Thoughts

The National Insurance hike, though costly, is straightforward, once you figure it out. However, one thing you want to avoid with the income thresholds changing in April and again in July 2022, is adjusting your payroll manually. Your payroll software should take care of these changes seamlessly and communicate those to your employees on their payslips. Finally, you can look into the different methods of reducing your NI bill which could benefit both you and your employees.

FAQs about Employer National Insurance

Do employers pay National Insurance in the UK?

Yes, employers need to pay National Insurance in the UK. To do this, they deduct their employees’ NI contributions, which they pay on their behalf. They also need to pay an additional additional NI contribution on employees’ earnings above the relevant threshold.

How much NI does an employer pay in the UK?

The factors that define the amount of NI contributions you need to pay as an employer are the size of your business and the National Insurance category of your employees. For example, for the tax year 22/23, the NI contribution that employers need to pay is 15.05% on any employee earnings exceeding the secondary threshold (£175/week or £758/month).

Do employers pay NI for employees in the UK?

As an employer in the UK, you need to deduct your employees’ NI contributions as well as pay your own contributions for employer NI insurance on the earnings of your employees.

How is NI calculated?

NI is calculated by payroll software as a percentage on the gross income of an employee’s income. Employees pay a typically 12% up to a certain threshold, and 2% above that, and get this amount deducted automatically from their pay. Additionally, employers also pay an amount, typically 13.8% on top of the employee contributions. However, there is an allowance, typically £1,048 per month, which is free from NI, so you only pay on amounts above that amount.