Everything you need to know about pre-tax deductions

In the 2023-2024 tax year, it’s estimated that the gross Income Tax and National Insurance Contributions relief on pensions alone was £78.2 billion—that’s without calculating the many other salary sacrifice schemes, childcare benefits, and other forms of pre-tax deductions.

However, pre-tax deductions aren’t just a benefit; they’re a requirement, and one that’s essential for your business. Many pre-tax deductions are statutory requirements that could cost your business if you don’t process them correctly. And without robust employee benefits, you may find that talent slips through your fingers. Both are bad scenarios.

But don’t worry—pre-tax deductions aren’t as confusing once you break them down. Learn everything you need to know about pre-tax deductions with this handy guide.

What is a pre-tax deduction?

A pre-tax deduction is any money taken from an employee’s gross pay before taxes are calculated and withheld from their pay slip. These deductions reduce the employee’s taxable income liability, meaning they'll owe less in PAYE contributions, as their gross salary will be reduced.

These pre-tax deductions can fall into two categories:

• Required by law (statutory). These deductions include things such as student loan repayments or workplace pension contributions.
• Voluntary (non-statutory). Voluntary pre-tax deductions could cover Payroll Giving for charity donations, voluntary pension contributions, or benefits such as the Cycle to Work Scheme or union fees.

Certain pre-tax deductions could also reduce the amount of National Insurance owed, such as with salary sacrifice schemes.

Pre-tax deductions vs. payroll deductions

Pre-tax deductions and payroll deductions may sound interchangeable, but they carry some specific differences.

The term  payroll deductions  describe any wages withheld from an employee’s pay slip. It’s an umbrella term that encompasses things such as pre-tax deductions. Payroll deductions cover both voluntary and mandatory deductions, ranging from union dues to income tax and National Insurance Contributions. An employee's pay stub should reflect both mandatory and voluntary payroll deductions.

Following this definition, all pre-tax deductions are payroll deductions, but not all payroll deductions are withheld on a pre-tax basis. Whether a payroll deduction is withheld pre- or post-tax, deductions will reduce an employee’s take-home (net) pay.

Pre-tax deductions examples
The government may change the rules regarding pre-tax deductions on an annual basis. Regulations and limits are also subject to change. Be sure to check for updated information regarding any pay slip deductions before modifying your payroll.

A variety of deductions, contributions, and ​​qualified fringe benefits can be pre-tax. Here’s a list of items that typically qualify as pre-tax deductions (as of 2026):

• student/postgraduate loan repayments
• workplace pension contribution
• salary Sacrifice schemes
• payroll giving
• professional fees
• child maintenance.

Workplace pensions

There are two primary methods used when calculating a workplace pension—either ‘net pay arrangement’ or ‘relief at source’.

If an employer takes the contribution from an employee’s pay before it’s taxed, they’re using the net pay method. That means, regardless of the tax bracket, the employee will get the full tax relief. If they don’t pay tax, they’ll get no tax relief, because they earn below the threshold. On the employee’s payslip, they’ll see their pension contribution plus the tax relief. This would be a 'pre-tax deduction'.

An employer may choose the relief at source method, where they deduct the pension contribution after considering any PAYE. Based on the employee’s earnings, the pension provider will then add any tax relief to the pension amount.

This tax relief is paid at the basic rate, and the employee may need to claim money back if they pay a higher or additional rate of income tax. With relief at source, the sum on the payslip only considers the employee’s contributions—not the tax relief.

Salary sacrifice schemes

Salary sacrifice schemes are an agreement where, for a non-cash benefit, employees opt to 'give up' a portion of their salaries. These schemes can cover a range of benefits, including gym memberships, childcare vouchers, bicycles, pension schemes, and ultra-low-emission vehicles (ULEVs), among others.

With these schemes, your employees are 'sacrificing' a portion of their gross taxable income, which 'reduces' the amount of pay they’re receiving, thus lowering their taxable income. Salary sacrifice schemes are recognised as a formal agreement with an employer, who’ll amend the employee’s cash salary. This means they won’t need to claim anything back in tax relief later.

Salary can’t be sacrificed below the National Minimum Wage, and lower earnings could impact certain benefits, such as sick pay or maternity/paternity. Many mortgage lenders understand salary sacrifice arrangements, if the employee can provide proof from you as an employer. However, some mortgage lenders may only consider the post-sacrifice income.

Benefits of pre-tax deductions

Pre-tax deductions are beneficial to most employees and employers, allowing employees to enjoy benefits such as workplace pensions and a range of schemes to assist them, before their gross income is taxed.

This reduces the employee’s tax burden and usually saves them money over time. For example, an employee will often pay less for childcare vouchers than they would if they paid for childcare services without the scheme.

Pre-tax deductions are advantageous, but most plans have a limit to the number of contributions that can be made in a year. This means employees don't get infinite savings from their pre-tax contribution programs and schemes.

How pre-tax deductions reduce taxable income

Pre-tax deductions almost always reduce an employee's taxable income. This is because the money is deducted from the employee’s gross pay, which means there’s a smaller sum that’s subject to tax withholding. Pre-tax deductions also benefit companies by reducing their payroll costs and lowering their potential tax liability. Offering salary sacrifice schemes can also attract and retain talent, making pre-tax deductions a win-win proposition.

Pre-tax deductions can vary year on year. They're adjusted for inflation and cost of living by the government and can change with other underlying rules or budgets set by them, too. This can impact the amount of tax deducted from your payslip, and how much taxable income is reduced from one year to the next. The UK tax year runs from 6 April to 5 April, and changes are often announced in accordance with that.

You may also encounter post-tax deductions, which are taken from the employee’s payslip after PAYE contributions have been accounted for. These could include loan repayments, union dues, shares, or insurance premiums, and more. If these are necessary for your job, you may be able to claim tax relief.

Next steps: Perfecting the pre-tax process

Pre-tax deductions in the UK are an important tool for both employers and employees to get the most out of their pay. And benefits aside, non-compliance can result in hefty fines or even criminal charges. However, pre-tax deductions may feel confusing—especially when you consider that payroll deductions can vary from one employee to the next.

Manage pre-tax deductions easily with BambooHR. Protect yourself against the consequences of not applying statutory pre-tax deductions, and ensure your employees get what they need from their payslip, with payroll and HR software that means business.