Understand the standard 2026/27 employee assumptions behind Income Tax, National Insurance, pension and student-loan estimates — and when real payroll can differ.
Salary figures are illustrative annualised calculations, not HMRC assessments, payslip reproductions or personalised financial advice.
The standard salary example uses annual employee gross pay in England, Wales or Northern Ireland for tax year 2026/27. It assumes a full standard Personal Allowance represented by tax code 1257L, no pension contribution and no student-loan deduction unless a different option is selected. It is not a self-employment or dividend-tax calculation.
The salary engine allocates taxable income across applicable bands and reduces the standard Personal Allowance at higher adjusted net income under its modelled assumptions. Scotland uses a different Income Tax band structure. An actual tax code, benefits and non-salary income can change your personal taxable position.
Employee Class 1 National Insurance is distinct from Income Tax. Our annualised salary model applies the active 2026/27 employee rates and thresholds. Actual payroll calculates NI using the relevant pay period and may differ for irregular earnings, directors, category letters or unusual payment patterns.
A selected pension contribution changes the estimate according to the model's supported pension treatment; salary sacrifice and relief-at-source should not be assumed equivalent to a net-pay arrangement. Student-loan repayments depend on the chosen plan and applicable threshold. Below-threshold loans can correctly show a £0 deduction.
Comparison pages calculate each gross salary separately and show the difference in estimated annual and monthly net pay. A reverse-salary result seeks an estimated gross amount for a target net income. Both depend on the same input assumptions; neither can decide whether a particular job offer is suitable for you.
PAYE can depend on cumulative tax, start dates, tax-code changes, bonuses, year-to-date corrections, pension treatment and employer payroll timing. Compare like-for-like annual or period amounts, then check HMRC records or payroll when an actual payslip is different.
Important
TaxDecod cannot establish your actual tax liability, confirm employer payroll compliance, account for every relief or benefit, or provide regulated tax or financial advice. Review the assumptions on each result. For a disputed deduction, verify your tax code with HMRC or your payroll team.
Sources
Income Tax rates
Primary public reference for Income Tax band and Personal Allowance explanations.
Employer rates and thresholds
Used to align employer/PAYE-facing threshold language for the 2026/27 tax-year basis.
2026/27 student loan thresholds
Plan thresholds and percentages when student-loan deductions are selected.
Scottish Income Tax
Published Scottish rates and bands; Scottish Income Tax differs from the other UK nations.
Tax code meaning
Used where a page explains how PAYE codes influence deductions.
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