England, Wales, NI and Scotland. Salary sacrifice, pension, student loan. Band-by-band working.
Salary sacrifice is deducted from gross pay first — reducing both Income Tax and National Insurance. Personal pension contributions (relief at source) reduce adjusted net income, which affects the Personal Allowance calculation and income tax, but not NI. Income Tax is then applied band-by-band to the remaining taxable income.
Scottish taxpayers pay income tax under six bands set by the Scottish Parliament. Toggle the Scotland switch to apply: Starter (19%), Basic (20%), Intermediate (21%), Higher (42%), Advanced (45%), and Top (48%). National Insurance is not devolved — the same rates apply across the whole UK.
Between £100,000 and £125,140 adjusted net income, the Personal Allowance reduces by £1 for every £2 earned. This creates an effective marginal rate of approximately 60%. Pension contributions reduce adjusted net income directly and can restore some or all of the allowance.
Salary sacrifice saves both Income Tax and NI on the sacrificed amount (employer and employee). Personal pension contributions (relief at source) save Income Tax only — NI is calculated on the pre-sacrifice gross. If your employer supports salary sacrifice, it is usually more efficient.