24/07/2023
In today's dynamic economic landscape, it's increasingly common for individuals across the UK to juggle more than one source of income. Whether driven by the rising cost of living, a desire to expand skill sets, or simply to pursue a passion, the trend of taking on a second job – often referred to as a 'side hustle' – is on the rise. Royal London reports that 5.2 million people in the UK currently hold a second job, with a further 10 million contemplating one. While the allure of increased earnings is clear, many are left wondering about the implications for their tax obligations. Understanding how your combined income from multiple roles affects your tax is crucial to avoid underpayment or overpayment, ensuring financial peace of mind. This comprehensive guide will demystify the complexities of taxation when you're working more than one job, covering everything from your Personal Allowance to specific tax codes and National Insurance contributions, helping you navigate the system with confidence.
Understanding Second Jobs and Tax Fundamentals
The journey into multi-job employment begins with grasping the core principles of how your earnings are taxed. It's a common misconception that simply having a second job automatically means you pay more tax. In reality, your increased tax rates reflect the overall increase in your combined salaries, which may push you into a higher tax bracket. The key is how your single Personal Allowance is applied across your multiple incomes.
What Counts as a Second Job?
A 'second job' can take many forms. It might be another employed role with a different company, or it could be a self-employed venture, often called a 'side hustle,' that you fit around your main employment. Many people schedule their second job during evenings or weekends, leveraging hobbies or existing skills. For instance, someone working full-time in IT might run a clock-repair business in their spare time. Alternatively, the second job could be related to the first, such as a hairdresser working in a salon during the week and offering self-employed services from home on weekends. Regardless of the nature or connection between roles, the tax implications hinge on your total earnings across all jobs and how your Personal Allowance is utilised.
Your Personal Allowance Explained
Every individual in the UK is entitled to one tax-free Personal Allowance each year. For the tax year 2023/24, this allowance stands at £12,570. This means you can earn up to this amount before any Income Tax becomes payable. Crucially, this allowance is singular, regardless of how many jobs you hold. If your combined earnings from all your jobs exceed this £12,570 threshold, any income above it becomes subject to Income Tax. If your first job's salary already consumes your entire Personal Allowance, then all earnings from your second job will be immediately taxable.
Do You Need to Tell HMRC About Your Second Job?
The requirement to inform HM Revenue & Customs (HMRC) about a second job depends on the nature of that employment. If your second role is self-employed and you anticipate making over £1,000 profit annually from it, you are legally required to register for Self Assessment. This process ensures that HMRC can accurately assess and collect the correct amount of tax due on your self-employed earnings. If your self-employed profits are less than £1,000 per year, you generally do not need to register for Self Assessment. However, if your second job is another employed role, your employer will typically handle the tax deductions through PAYE (Pay As You Earn), and HMRC will usually be informed via your tax code.
Decoding Tax Codes and Bands
Understanding the tax codes assigned to your jobs and the different tax bands is vital for managing your finances effectively. Your tax code is a critical indicator of how much tax HMRC will deduct from your salary, and being on the wrong code can lead to over or underpayment.
Common Tax Codes for Second Jobs
The tax code for a second job is most commonly 'BR'. This stands for Basic Rate, meaning that all income from this job is taxed at the basic rate of Income Tax, which is currently 20%. This applies because your primary job typically receives the benefit of your Personal Allowance. If your combined earnings are significantly high, your second job might be assigned a 'D0' code, indicating that all income from it is taxed at the Higher Rate (40%), or even a 'D1' code for the Additional Rate (45%).
UK Tax Bands Explained
The UK operates a progressive Income Tax system, meaning you pay higher rates of tax on higher portions of your income. The tax bands for the 2023/24 tax year are as follows:
| Band | Taxable Income | Tax Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 to £50,270 | 20% |
| Higher Rate | £50,271 to £150,000 | 40% |
| Additional Rate | Over £150,000 | 45% |
It's important to remember that these bands apply to your *total* taxable income across all jobs. If your combined earnings push you into a higher band, the portion of your income falling into that band will be taxed at the corresponding higher rate.
How Your Personal Allowance is Applied
As established, you only get one Personal Allowance. If your earnings from your first job exceed £12,570, your entire Personal Allowance will be applied to that income, leaving no tax-free allowance for your second job. Consequently, all earnings from your second job will be taxed from the first pound. For example, if you earn £21,000 in Job A, you'll pay 20% tax on £8,430 (£21,000 - £12,570). If you then earn £6,000 in Job B, you will pay 20% tax on the entire £6,000 from Job B, as your Personal Allowance has already been fully utilised.
However, if your earnings from both jobs *individually* fall below the Personal Allowance, you have the option to split your allowance. For example, if you earn £12,000 in Job A and £4,000 in Job B, you could ask HMRC to transfer the unused portion of your Personal Allowance from Job A (£570) to Job B. This would mean the first £570 of your Job B income is tax-free, and you'd only pay 20% on the remaining £3,430. Alternatively, you can wait until the end of the tax year and claim a refund for any overpaid tax.
If your combined earnings exceed £50,000, you must notify HMRC. They typically consider the job from which you earn the most as your 'main' job, applying your Personal Allowance to that income. Any remaining income, especially from your second job, may then be taxed at the Higher Rate (40%) or even the Additional Rate (45%) if your income is very high.
National Insurance Contributions
Beyond Income Tax, you also need to consider National Insurance contributions. If your earnings are over £242 per week, you will pay Class 1 contributions at a rate of 12% on earnings between £242 and £967 per week, and 2% on earnings above £967 per week. For self-employed individuals, different rules apply, requiring Class 2 and Class 4 contributions based on profits. If you are employed in one role and self-employed in another, you will likely pay both Class 1 contributions on your salary and Class 2 and 4 contributions on your profits. HMRC will inform you of your total National Insurance contributions after you file your Self Assessment tax return, based on your combined earnings.
Before embarking on a second job, it's prudent to consider not only the tax implications but also any contractual obligations or legal limitations that might apply. Ensuring compliance on all fronts can save you from potential disputes or penalties.
Are You Allowed to Take a Second Job?
While it is not illegal to work multiple jobs simultaneously, your primary employment contract may contain clauses that restrict or prohibit secondary employment. Some contracts might forbid working for a competitor or within the same industry, while others might broadly prevent any other employment to ensure your dedication to your main role. Employers want to ensure their workers are adequately rested and focused. Furthermore, there's a legal limit to the average working week, typically 48 hours, which both employers (if you are employed) are responsible for ensuring you do not exceed. It is always advisable to review your employment contract and discuss your intentions with your current employer before taking on a second role. Failure to notify or comply with contractual terms could lead to disciplinary action, or even dismissal.
Working Out How Much Tax You Owe
Calculating your tax liability with a second job can seem daunting, but it largely depends on how your single Personal Allowance is distributed across your incomes and whether your combined earnings push you into a higher tax bracket. Let's look at three illustrative examples:
Example 1: Personal Allowance Fully Used by Main Job
- Adam earns £15,000 annually in Job A and £5,000 annually in Job B.
- His £12,570 Personal Allowance is applied entirely to Job A.
- Adam pays 20% tax on the remaining £2,430 from Job A (£15,000 - £12,570).
- Since his Personal Allowance is exhausted, he must pay 20% tax on the entire £5,000 earned from Job B.
Example 2: Splitting Personal Allowance Across Jobs
- Bella earns £9,000 in Job A and £7,000 in Job B. Both incomes are below the Personal Allowance threshold.
- Bella has £3,570 of unused Personal Allowance from Job A (£12,570 - £9,000).
- She can contact HMRC to split her Personal Allowance, applying the remaining £3,570 to Job B.
- Bella will pay 20% Income Tax on the remaining £3,430 from Job B (£7,000 - £3,570).
Example 3: Combined Income Reaches Higher Rate
- Chris earns £43,000 annually in Job A and £12,000 in Job B.
- Individually, Job A is within the Basic Rate band. However, their combined income is £55,000, pushing them into the Higher Rate tax category.
- Chris pays 20% tax on income over £12,570 from Job A.
- From Job B, Chris pays 20% tax on the first £270 (up to the Basic Rate threshold of £50,270 when combined with Job A's taxable income).
- He then pays 40% tax on the remaining £11,730 from Job B, as this portion falls into the Higher Rate band.
Strategies for Managing Your Tax
Navigating tax with multiple jobs can be complex, but several strategies can help you manage your contributions effectively:
- Pension Contributions: Increasing your pension contributions can reduce your taxable income. Contributions are often paid at a net amount (e.g., 80% for a basic rate taxpayer), with the government providing 20% tax relief, effectively making your contribution tax-free. If your employer offers a salary sacrifice arrangement for pension contributions, this can be particularly beneficial, as it reduces your taxable income directly from your gross pay and may even lead to your employer paying their National Insurance savings into your pension pot.
- Check Your Tax Code: Regularly reviewing your Tax Code is crucial. HMRC uses this code to determine how much tax to deduct from your salary. If you're on an incorrect tax code, you could be overpaying or underpaying. You can check your tax code on your payslip or via your Personal Tax Account on the government website.
- Seek Professional Advice: For complex situations, particularly if you have varied income streams or high earnings, consulting a tax advisor or accountant is highly recommended. They can provide tailored advice, help you optimise your tax position, and ensure you comply with all regulations.
Frequently Asked Questions (FAQs)
How does a second job affect my benefits?
Eligibility for benefits and tax credits in the UK is largely influenced by household income. A second job, by increasing your overall income, could potentially push you above the eligibility thresholds for certain benefits. It is critically important to notify HMRC and Jobcentre Plus immediately if your income changes in any way, including starting a second job. You can use trusted benefits calculators, such as those provided by Policy in Practice, entitledto, or Turn2us, to estimate how a second income might affect your benefit entitlement.
What should I do if I am paying too much tax?
If you suspect you are overpaying Income Tax, you should contact HMRC directly. You might be eligible for a tax refund if an overpayment is confirmed. HMRC can also correct your tax code if it has been incorrectly applied, which directly influences how much tax is deducted from your pay. To check if you're paying the correct amount, you can use the government's free online calculator or log into your personal tax account on the government website to review your tax payments from current and previous tax years.
How can I apply for a tax refund?
If HMRC identifies that you have overpaid tax, they will typically send you a P800 letter. This letter will detail the overpayment and explain how to claim your refund, which is often done online. If you believe you are due a refund but have not received a P800 letter, it may be that HMRC has not yet completed their calculation for your tax year. In such cases, or if you have any doubts, you should contact HMRC to inquire about your tax situation and potential refund.
Conclusion
Working a second job can significantly boost your income and broaden your horizons, but it comes with distinct tax considerations. The amount of tax you pay on earnings from a second job hinges entirely on your total combined income and how your single Personal Allowance is applied. If your main job's salary already consumes your entire £12,570 Personal Allowance, then all income from your second job will be subject to the Basic Rate of 20%. Should your combined earnings push you beyond the £50,270 threshold for the Higher Rate, a portion of your second job's income will be taxed at 40% or even 45%. Proactive management, including understanding your tax code, making strategic pension contributions, and seeking professional advice when necessary, are key to ensuring you pay the correct amount of tax and avoid any unwelcome surprises. By staying informed and organised, you can confidently navigate the complexities of multi-job taxation in the UK.
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