Two Jobs Salary Benchmark Scenarios (2026/27 Tax Year)
Examples use the same annual estimate as the tool: one Personal Allowance for combined Income Tax and separate annual NI calculations for each employment. They are not PAYE payslip predictions.
| Job 1 salary | Job 2 salary | Combined Gross | Total Income Tax | Total NI | Monthly Net | Combined Take-Home |
|---|---|---|---|---|---|---|
| £25,000 | £10,000 | £35,000.00 | -£4,486.00 | -£994.40 | £2,459.97 | £29,519.60 |
| £30,000 | £10,000 | £40,000.00 | -£5,486.00 | -£1,394.40 | £2,759.97 | £33,119.60 |
| £45,000 | £15,000 | £60,000.00 | -£11,432.00 | -£2,788.80 | £3,814.93 | £45,779.20 |
Dual Job Tax & NI Advantage Guide
Working two jobs in the UK confuses millions of taxpayers. Understanding why secondary income receives a BR tax code and how the statutory National Insurance threshold operates can save you thousands of pounds.
Why the BR Code is Applied (And Why It Isn't "Double Tax")
Every UK resident receives a single £12,570 Personal Allowance (Tax Code 1257L) under Section 35 of the Income Tax Act 2007. When you take on a second job:
Your primary employer applies your entire £12,570 Personal Allowance (£1,047.50/month tax-free). Income earned up to this threshold incurs 0% Income Tax.
Because your allowance is fully consumed by Job 1, HMRC instructs Job 2 to apply code BR (Basic Rate). This deducts a flat 20% on all earnings from pound one.
The Dual National Insurance Advantage: How Having Two Jobs Saves £1,005.60/Year
Unlike Income Tax—which is cumulative across all earnings under ITEPA 2003—Class 1 employee National Insurance is assessed per separate employment per pay period under Section 6 of the Social Security Contributions and Benefits Act 1992 (SSCBA 1992). Each independent employer provides an independent £12,570/year (£1,048/month) Primary Threshold at 0% NI!
- Gross Annual Salary:£40,000.00
- Income Tax (20% on £27,430):-£5,486.00
- Class 1 NI (8% on £27,430):-£2,194.40
- Net Annual Take-Home:£32,319.60
- Combined Gross:£40,000.00
- Combined Income Tax:-£5,486.00 (Identical)
- Combined Class 1 NI (2 × £594.40):-£1,188.80
- Net Annual Take-Home:£33,325.20
*Statutory note: This separate NI threshold rule applies to independent employers. Under Regulation 14 of the Social Security (Contributions) Regulations 2001 (SI 2001/1004), earnings are aggregated if employers share commercial ownership or operate as associated companies to avoid contributions.
How to Split Your Personal Allowance Between Jobs
If your main job pays less than £12,570 (for example, a part-time role paying £8,000/year), your second job should NOT be on a BR code. If it is, £4,570 of your tax-free allowance will sit unused at Job 1 while Job 2 pays 20% on all earnings!
You can contact HMRC via your online HMRC Personal Tax Account or mobile app to request a code split (e.g. Tax Code 800L for Job 1 and 457L for Job 2). This ensures your full allowance is utilized every pay period without having to wait until after 5 April for an HMRC P800 rebate.
When Your Tax Code May Need Reviewing
If your tax codes do not reflect your expected total income, contact HMRC to review them. HMRC decides the allowance allocation and tax codes for your circumstances; the steps below do not recommend a particular split:
HMRC decides which codes and allowance allocation to use based on your circumstances. Do not assume that a particular split or code will be issued:
- Sign in to your online HMRC Personal Tax Account or use the HMRC mobile app.
- Navigate to the Pay As You Earn (PAYE) section and view your current employments.
- Tell HMRC your expected income from each job and ask whether your tax codes should change.
- Check any new coding notice and review your payslips after the change takes effect.
Frequently Asked Questions: Second Job Tax in the UK
Clear answers based on official HMRC rules and statutory guidance.
Authored and verified by UK tax and payroll specialists in accordance with the Income Tax (Earnings and Pensions) Act 2003 (ITEPA 2003), Income Tax Act 2007, and Social Security Contributions and Benefits Act 1992 (Section 6). Calculations reflect the 2026/27 tax year.
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Use the stated tax code and gross pay to compare employment deductions in England, Wales and Northern Ireland. Monthly, weekly and daily figures divide an annual result; they do not reconstruct cumulative payroll.
The main pension input models salary sacrifice. Irregular pay, benefits in kind, multiple employments and a different pension method can change a real payslip. Use the Scottish tool for Scottish employment income.
Check the rules for your circumstances
Official guidance supports the rules described here; it does not approve or certify this calculator. Confirm dates, eligibility and unsupported cases before making a financial decision.