UK Tax Year 2023/2024 breakdown
§ A · England, Wales & Northern Ireland
Income tax bands & thresholds
| Band | Income range | Rate |
|---|---|---|
| Personal Allowance | £0 – £12,570 | 0% |
| Basic rate | £12,570 – £50,270 | 20% |
| Higher rate | £50,270 – £125,140 | 40% |
| Additional rate | Over £125,140 | 45% |
§ B · Scotland
Scottish income tax bands
| Band | Income range | Rate |
|---|---|---|
| Personal Allowance | £0 – £12,570 | 0% |
| Starter rate | £12,570 – £14,732 | 19% |
| Basic rate | £14,732 – £25,688 | 20% |
| Intermediate rate | £25,688 – £43,662 | 21% |
| Higher rate | £43,662 – £125,140 | 42% |
| Advanced rate | £125,140 – £125,140 | 42% |
| Top rate | Over £125,140 | 47% |
§ C · Class 1 employee
National Insurance tiers
| Band | Earnings slice | Rate |
|---|---|---|
| Below Primary Threshold | £0 – £12,570 | 0% |
| Main rate (PT → UEL) | £12,570 – £50,270 | 11.5% |
| Upper rate (above UEL) | Over £50,270 | 2% |
2023/24 — The Threshold Collapse and the Split National Insurance Year
The 2023/24 fiscal calendar is regarded as one of the most volatile tax periods in modern UK accounting history due to mid-year policy adaptations and structural threshold compressions.
The definitive policy shift occurred at the highest tier of the PAYE framework: the Additional Rate (and Scottish Top Rate) threshold was lowered from £150,000 down to £125,140. This intentional change exposed hundreds of thousands of high earners to the top tax percentages early, aligning exactly with the final point where the £100k Personal Allowance taper completely eliminates an individual’s tax-free allowance.
The Unique Mid-Year National Insurance Split
Unlike almost all historical tax cuts which cleanly align with the April 6th boundaries, the Class 1 employee National Insurance adjustment for 2023/24 was rolled out as an emergency mid-year intervention:
- From 6 April 2023 to 5 January 2024, employee National Insurance was calculated at the legacy baseline rate of 12%.
- From 6 January 2024 to 5 April 2024, the main rate was cut to 10%.
For standard real-time computation structures, payroll software used precise date-demarcated algorithms to split payslip calculations. For unique setups (such as company directors subject to annualized assessment rules), HMRC applied a blended statutory average contribution rate of 11.5% for the cumulative year.
Scotland’s 5-Band Framework
During 2023/24, Scotland still operated within its traditional 5-band system (the 45% Advanced Rate did not exist yet). However, the Scottish Government increased both the Higher Rate and Top Rate parameters by 1p, moving them up to 42% and 47% respectively.
Higher Historic Exemptions
Compared to subsequent years, the 2023/24 environment preserved slightly higher allowances for personal investments:
- The Dividend Allowance stood at £1,000 before being lowered in later cycles.
- The Capital Gains Tax Exempt Amount provided a buffer of £6,000 for asset disposals.
Contextual Routing Record
This historical record matches the computational matrix logic mapped under your internal dependencies. All associated data visualizers ingest the static variables matching this page’s fiscalYear metadata array. For checking past self-assessment tax returns, tracking historical P60 parameters, or viewing deep multi-variable models, please run your dataset parameters through the active terminal array at SalaryGrid.uk.
Model pensions, student loans and salary sacrifice against this year's bands
The sidebar covers the core PA + IT + NI math. SalaryGrid's full grid layers in workplace pensions, custom tax codes, marriage allowance and the 60% trap optimiser — all running against the 2023/2024 ruleset.