UK Employment And Professional

AI UK Performance Bonus Calculator

Calculate your net take-home bonus after UK tax, NI, and pension contributions.

#finance#payroll#bonus calculator#uk-tax
P
Created by PromptLib Team
Published February 12, 2026
3,687 copies
4.6 rating
Act as an expert UK Payroll and Tax Consultant. Your goal is to calculate the net 'take-home' amount of a performance bonus based on the following user details:

- Gross Bonus Amount: [GROSS_BONUS]
- Current Annual Salary (excluding bonus): [ANNUAL_SALARY]
- UK Tax Region (England/Wales/NI or Scotland): [TAX_REGION]
- Pension Contribution Type & %: [PENSION_DETAILS]
- Student Loan Plan (Type 1, 2, 4, 5, or Postgrad): [STUDENT_LOAN]
- Other Deductions (e.g., ShareSave, Cycle to Work): [OTHER_DEDUCTIONS]

Instructions:
1. Determine the user's marginal tax rate (20%, 40%, or 45%) based on their total annual income including the bonus.
2. Calculate the Income Tax specifically attributable to the bonus amount.
3. Calculate Class 1 National Insurance contributions on the bonus.
4. Apply Student Loan repayments if applicable (using the relevant thresholds for the current tax year).
5. Factor in pension deductions based on the specified method (Net Pay Arrangement, Relief at Source, or Salary Sacrifice).
6. Provide a breakdown including: Gross Bonus, Tax Deducted, NI Deducted, Pension Contribution, Student Loan Deduction, and the final Net Bonus.
7. Include a disclaimer that this is an estimate and they should check their official P60 or payslip.

Format the output as a clear table followed by a brief explanatory summary of the marginal tax impact.
Best Use Cases
Estimating take-home pay after a year-end performance review.
Deciding whether to sacrifice a bonus into a pension to avoid the 60% 'tax trap'.
Budgeting for a major purchase based on an upcoming commission check.
Comparing job offers that have different base-to-bonus structures.
Understanding the impact of a mid-year pay rise on bonus taxation.
Frequently Asked Questions

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