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Why Your Salary Tax Deduction May Look Wrong

A practical guide to why monthly payroll tax can look too high or too low, and how to check it before assuming payroll is right.

Published 2026-05-06 · 7 min read

Payroll Is Not Always Wrong — But It Is Not Always Explained Well

Many employees notice that their salary tax deduction suddenly jumps and assume something suspicious happened. Sometimes payroll is correct. Sometimes it is using rough assumptions. Either way, you need a cleaner way to check it.

Common Reasons the Deduction Changes

  • annual bonus or arrears were added
  • the employer projected a higher yearly salary than you expected
  • the calculation was spread unevenly across the year
  • your credit assumptions were not included
  • a raise pushed part of your income into a higher slab

What to Compare

  1. monthly gross salary
  2. annualized income
  3. bonus amount
  4. estimated annual tax
  5. monthly withholding pattern

Use a Salary-Only Check First

The Rafiqy salary tax calculator is useful here because it focuses on the exact salaried planning case most employees need. Put in the salary, add any bonus, test VPS or charity if relevant, and compare the annual estimate with what payroll is deducting.

When to Escalate

If the deduction still feels materially off after a clean estimate, then ask payroll or HR for the projected annual basis they are using. That usually reveals whether the difference comes from bonus assumptions, missing credits, or simple communication gaps.

Check whether your payroll tax feels wrong because of the slab, the bonus, or the assumptions behind it.

Compare your salary tax estimate →

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