How to use SlipSense

SlipSense is built for the visible top-line numbers on a UK-style payslip: gross pay, net pay, common deductions, tax code, National Insurance category, and optional hours or overtime.

Quick start

1. Copy the gross pay and net pay exactly as shown.
2. Add the visible deductions you can see on the payslip.
3. Optional: include hours worked, overtime pay, the tax code, and the NI category.
4. Use the output to decide whether you simply needed a clearer explanation or whether payroll needs a follow-up question.

What each field means

• Gross pay: total pay before deductions.
• Net pay: the amount actually landing after deductions.
• Income tax: PAYE tax deducted this period.
• National Insurance: employee NI deducted this period.
• Pension: employee pension contribution visible on the payslip.
• Student loan: student loan repayment deducted this period.
• Other deductions: any remaining deductions such as salary-sacrifice leftovers, union fees, attachment orders, season-ticket loans, or other payroll items.

Important boundaries

• SlipSense only reads the numbers you enter. It does not connect to payroll or HMRC systems.
• It is a public explainer, not formal tax, payroll, pension, or employment advice.
• Unexpected deductions can still be legitimate, especially after bonuses, tax-code changes, catch-up corrections, or overtime-heavy periods.

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