Why is my tax so high?
Seeing a larger deduction than usual can be unsettling. In many cases, UK PAYE changes are caused by timing or code changes rather than a payroll mistake.
Common reasons for a spike
The UK tax system works on a Pay As You Earn basis. When your income or employment details change, the system recalculates what to deduct from that pay period.
redeem You received a bonus or commission
One-off payments can make payroll treat that month as if your earnings will stay higher, which can temporarily increase the PAYE deduction.
work_history You recently changed jobs
If you start a new role without a P45 or HMRC update, your employer may use an emergency code. That often changes how much tax-free allowance is applied.
Other causes can include taxable benefits, underpaid tax being collected through payroll, or a code that allocates your allowance to a different source of income.
Still unsure?
Use the tool to check your tax code first. It is usually the fastest way to spot if your payslip is using standard or emergency treatment.
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