Finance · Topic 4 of 19
Deductions
Theory
A person's net pay (often called "take-home pay") is the final amount of money they receive in their bank account after all deductions have been subtracted from their gross pay.
When faced with a full net pay exam question, you must calculate multiple different deductions. The order in which you calculate them is critical.
1. Common Deductions
- National Insurance (NI): Calculated on the gross salary before any other deductions are taken away.
- Pension Contributions: Usually calculated as a straight percentage of the gross salary. Often, an employer will also pay into the pension, but the employer's contribution does not come out of the employee's pay.
- Income Tax: Calculated on the taxable income (which is the Gross Pay minus the employee's pension contribution).
- Student Loans: Usually calculated as a set percentage (e.g., 9%) of any earnings that fall above a specific monthly or annual threshold.
2. The Order of Operations (The 'Net Pay' Checklist)
To avoid losing cascading marks in a large exam question, always follow this strict order:
- State the Gross Pay.
- Calculate National Insurance.
- Calculate the Pension Contribution.
- Calculate the Taxable Income (Gross Pay - Pension).
- Calculate Income Tax using the tax bands.
- Calculate any Student Loan or other fixed deductions.
- Net Pay = Gross Pay - (NI + Pension + Tax + Student Loan).
Worked examples
Example 1
Example 1: Student Loan Deductions
Fraser has graduated from university and earns a gross annual salary of £33,600. His student loan repayments are calculated at 9% of any amount he earns above the monthly threshold of £2,038.
Calculate Fraser's monthly student loan deduction.
- Calculate monthly gross pay: £33,600 ÷ 12 = £2,800.
- Find the amount earned above the threshold: £2,800 - £2,038 = £762.
- Calculate 9% of this amount: 0.09 × £762 = £68.58.
Fraser's monthly student loan deduction is £68.58.
Example 2
Example 2: Pension Contributions (Employee vs. Employer)
Gemma earns £48,000 per year. She contributes 5.5% of her gross monthly salary into a private pension. Her employer also contributes 4.5% of her gross monthly salary into the same pension.
Calculate the total amount of money added to Gemma's pension fund over a 6-month period.
- Calculate monthly gross pay: £48,000 ÷ 12 = £4,000.
- Calculate Gemma's contribution: 0.055 × £4,000 = £220.
- Calculate the employer's contribution: 0.045 × £4,000 = £180.
- Total monthly addition: £220 + £180 = £400.
- Total over 6 months: £400 × 6 = £2,400.
Note: Only Gemma's £220 would be deducted from her own net pay.
Example 3
Example 3: The Full Net Pay Calculation (Exam Style)
Nadir is an architect earning a gross annual salary of £45,000. He pays 6% of his gross annual salary into a workplace pension. Using the 2025/26 tax year bands, calculate Nadir's net monthly pay.
Follow the strict checklist carefully:
1. Gross Monthly Pay:
£45,000 ÷ 12 = £3,750.
2. National Insurance (Monthly):
Nadir earns £3,750, which falls into the 8% band (£1,048 to £4,189).
- Amount in band: £3,750 - £1,048 = £2,702.
- NI Contribution: 0.08 × £2,702 = £216.16.
3. Pension Contribution (Monthly):
0.06 × £3,750 = £225.00.
4. Taxable Income (Annual):
- Annual Pension: 0.06 × £45,000 = £2,700.
- Taxable Income: £45,000 - £2,700 = £42,300.
5. Income Tax (Annual -> Monthly):
Use the 2025/26 Scottish Tax Bands on the £42,300 taxable income.
- Starter Rate (19%): £15,397 - £12,570 = £2,827. Tax: 0.19 × £2,827 = £537.13.
- Basic Rate (20%): £27,491 - £15,397 = £12,094. Tax: 0.20 × £12,094 = £2,418.80.
- Intermediate Rate (21%): £42,300 - £27,491 = £14,809. Tax: 0.21 × £14,809 = £3,109.89.
- Total Annual Tax: £537.13 + £2,418.80 + £3,109.89 = £6,065.82.
- Monthly Tax: £6,065.82 ÷ 12 = £505.49 (rounded to nearest penny).
6. Final Net Monthly Pay:
.