How to Reduce the Risk of a Tax Investigation
How to Reduce the Risk of a Tax Investigation
There are a lot of reasons to become a contractor. Whether you decide to approach contracting as a sole trader or set up a limited company, there are a lot of benefits to doing so. But, there’s one thing that holds some people back - the risk of a tax investigation. At Go Limited, we know the idea of undergoing a tax investigation is enough to fill you with dread. But, what if we told you it’s nothing to worry about? Armed with the right information and an idea of how to reduce the risk of an investigation, you can throw yourself into contracting without a second thought. As long as you stay on the right side of HMRC, a tax investigation isn’t something you need to worry about.
Set Up a Limited Company: Should You Be Worried About Tax Investigations?
For many contractors, forming a limited company is a smart move. It can offer tax efficiency, limited liability and greater flexibility in how you structure your income. However, it also comes with added responsibility, especially where tax, accounting and compliance are concerned. Setting up a limited company doesn’t mean you’re definitely going to be subjected to a tax investigation. But, you can’t rule it out completely, regardless of the industry that you work in.
The Importance of Getting Tax Right
If you’re worried about HMRC automatically putting you under the microscope the moment you set up a limited company, you’re not alone. It’s something a lot of contractors worry about, but there’s no guarantee it will happen. More often than not, HMRC investigates individuals and businesses when it suspects mistakes have been made, or if compliance isn’t up to scratch. So, it’s important to get things right.
Contractors with limited companies can attract attention from HMRC simply because you have more opportunities for tax planning. This doesn’t mean you should avoid going limited, but it does mean you should take compliance seriously from day one.
Does Setting Up a Limited Company Mean a Tax Investigation is Guaranteed?
No, setting up a limited company doesn’t automatically mean you’ll be investigated. In fact, the majority of limited company contractors never are, as HMRC doesn’t have the resources to investigate every business. It’s costly, time-consuming and with so many contractors operating in the UK, it’s impossible to investigate everyone. Instead, they focus their attention on people and businesses they think are a risk.
By comparing your tax returns to industry averages and looking for discrepancies, HMRC analyses who they think could be handling tax incorrectly, either on purpose or accidentally. Things like unusual expense claims, repeated losses or inconsistent reporting can all trigger checks, as HMRC sees these as possible red flags. But, if your limited company is run properly and everything you submit is accurate, they’re unlikely to find a solid reason to investigate.
Common Reasons for a Tax Investigation as a Limited Company Contractor
Though HMRC does conduct random checks, the majority of tax investigations happen for a reason. After all, they don’t want to spend money investigating you if there’s nothing to find.
- Mistakes on Tax Returns - There’s no denying that filing a tax return is complex, but making a mistake isn’t an option. Even minor errors - such as forgetting to declare a small amount of income or accidentally trying to claim the same expense twice - can make HMRC want to take a closer look.
- High or Unusual Expense Claims - One of the benefits of setting up a limited company as a contractor is having the ability to claim tax-deductible expenses. With allowable expenses, you can reduce how much tax you need to pay. But, claiming expenses that are not genuinely related to your business can be a red flag. HMRC looks at whether claims are ‘wholly and exclusively’ for business purposes. If you have high or unusual claims, they might want to know why.
- Low Salary, High Dividend Mix - Many contractors pay themselves a low salary, and top up their earnings with dividends. This is completely legal and it’s something a lot of contractors do, as it’s a tax-efficient way to operate. But, if your salary and dividend mix looks disproportionate compared to the work you’re doing, HMRC may question it.
- Repeated Late Filings - There are penalties in place for those who file tax returns late, and doing so isn’t grounds for a tax investigation. But, consistently filing your accounts or tax returns late can also suggest poor record-keeping, which may make HMRC want to check your records more closely.
- Unexplained Changes in Income - As a contractor, there’s a high chance that your income will fluctuate throughout the year. You’re bound to have peak seasons, and then months where there’s less to do. But, large spikes or drops without a clear reason, can sometimes lead to HMRC questioning whether all of your income has been reported correctly.
Are You Actually Working Inside IR35?
There’s a lot of confusion about IR35 legislation, and it can cause issues for limited company contractors who don’t know whether they’re working inside or outside of the rules. IR35 determines whether you’re genuinely self-employed or effectively working as an employee.
If you’re inside IR35, HMRC sees you as an employee for tax purposes. This means you have to pay Income Tax and National Insurance on most of your income. If you’re outside IR35, you can continue to benefit from the tax efficiencies of working through your limited company.
Claiming that you’re working outside IR35 when you’re actually working inside IR35 could mean that you’re not paying enough tax. This is something that HMRC are clamping down on. If HMRC carries out a tax investigation and you’re found to have misclassified yourself under IR35 rules, you could face backdated tax bills, penalties and interest.
This is why it’s important to have your contracts reviewed by a specialist, and ensure the written terms of your contract support your outside IR35 status. Check your working practices, keep records and take IR35 rules seriously. By doing so, you reduce the risk of HMRC investigating, save yourself the stress of a potential investigation.
Reduce the Chances of a Limited Company Tax Investigation
There’s no way to reduce the risk of a limited company tax investigation completely, but there are things you can do to make an investigation less likely.
- Keep Accurate, Detailed Records - Don’t underestimate the importance of keeping detailed records as a limited company contractor. Keep invoices, receipts and contracts in an organised system, ensuring they're always accurate and up to date. You also need to keep business and personal finances separate, and always use a dedicated business bank account. This ensures you’re always clear on what you’ve earned, what expenses you’ve had and you don’t accidentally claim a personal expense as being business related.
- File Everything On Time - Though there’s a lot to keep on top of as a contractor, filing something late is something to avoid as much as possible. Submit accounts, tax returns and VAT returns ahead of deadlines, and pay Corporation Tax, VAT, Income Tax and PAYE promptly. If you’re struggling, consider enlisting the help of an accountant.
- Be Realistic With Expenses - As a contractor with a limited company, you are entitled to claim business expenses. This includes a whole host of costs that your business has, such as equipment, raw materials, accounting and insurance. But, you can only claim what is genuinely allowable, and don’t include anything that was paid for personally. If you’re unsure, check with HMRC.
- Don’t Ignore IR35 Rules - Even if you’re working outside IR35, you need to keep up with the rules. Review your IR35 status regularly, especially if you take on new contracts, to ensure that you’re always complying with the legislation. If you’re not sure, seek expert advice to ensure you don’t make any costly mistakes.
- Work With a Limited Company Accountant - If you’re worried about the risk of a tax investigation, and you want to make sure you’re doing everything right, work with a limited company accountant. Choose an accountant who understands the contractor landscape, as they have the expertise needed to help you spot risks early and keep your business compliant.
At Go Limited, we know that running a limited company as a contractor offers many benefits, including having more control over your business, workload flexibility and potential tax savings. But, with these benefits comes extra responsibility. By keeping your records in order, staying compliant and taking IR35 seriously, you can reduce your chances of a tax investigation. Even if HMRC does investigate, having everything organised will make the process smoother and less stressful.
FAQ's
What is a tax investigation?
A tax investigation is when HMRC (His Majesty’s Revenue & Customs) reviews your financial affairs to ensure you’ve paid the correct amount of tax. For contractors, this can mean examining your income, expenses, contracts, dividends, and how you’ve classified your work under IR35. HMRC may check a single tax return, or they may go back several years if they suspect serious errors or deliberate evasion.
How long can a tax investigation take?
The length of a tax investigation depends on the complexity of the case. A straightforward compliance check can be wrapped up in a few months, while in-depth investigations sometimes take over a year. If HMRC suspects fraud, they can go back up to 20 years, which makes the process longer and more stressful. Contractors should expect regular requests for documents and may need to respond within strict deadlines.
How does HMRC investigate tax evasion?
HMRC uses a mix of technology and human expertise. Their advanced systems compare your declared income with third-party information such as bank transactions, PAYE records, or data from other government bodies. They also have access to international banking records through global information-sharing agreements. For contractors, HMRC often focuses on mismatches between contracts, timesheets, and declared income, particularly if IR35 status is in question.
Does HMRC investigate all tax evasion reports?
No, not every report leads to a full-blown investigation. However, every report is assessed. If HMRC believes there’s credible evidence, they may open an enquiry. Reports can come from employers, clients, or even anonymous tip-offs. Contractors should be aware that a single suspicious activity could trigger a review, even if it later turns out to be a misunderstanding.
What happens if I’m investigated for tax evasion?
If you’re under investigation, HMRC will contact you directly, usually by letter. They’ll request records such as contracts, invoices, expense receipts, and bank statements. If they find mistakes, you may need to repay the tax plus interest. In serious cases, penalties can be severe — up to 100% of the tax owed, or even criminal charges if fraud is proven. For most contractors, investigations focus on misclassification under IR35 or overstated expenses rather than deliberate fraud.
How much does a routine tax investigation cost?
There’s no official fee for being investigated, but the costs come from professional representation. Many contractors hire an accountant or tax adviser to handle the enquiry. Fees can range from a few hundred pounds for a simple case to several thousand if the investigation is complex. This is why many contractors consider tax investigation insurance to help cover these unexpected costs.
Do I need tax investigation insurance?
Tax investigation insurance (sometimes called fee protection insurance) covers the professional costs of dealing with HMRC on your behalf. It does not cover any tax you owe, but it can save you thousands in accountancy fees. Many accountants offer this as an add-on service to their clients. For contractors, it’s a form of peace of mind, especially if you’re working through a limited company and managing multiple contracts.
Can HMRC investigate foreign bank accounts?
Yes. HMRC has agreements with tax authorities worldwide that allow them to access information about UK residents’ overseas accounts. If you’ve worked abroad or hold savings offshore, HMRC can see whether you’ve declared the income. Contractors who’ve done short-term contracts in other countries should be particularly careful to report any overseas income correctly.
How long does it take HMRC to investigate tax evasion?
There’s no fixed timeframe. If HMRC suspects fraud, they may conduct what’s known as a “Code of Practice 9” (COP9) investigation, which can last several years. More routine enquiries are usually resolved in 6–12 months. The key factor is how quickly you respond and whether your records are in good order. Contractors with organised bookkeeping tend to get through the process much faster.
What problems does a tax investigation cause?
Beyond the potential financial penalties, a tax investigation can cause stress, reputational damage, and disruption to your business. Contractors may spend hours gathering documents and dealing with correspondence. If you rely heavily on one client, they may hesitate to keep working with you while HMRC is investigating, even if you’ve done nothing wrong. That’s why many advisers stress the importance of staying compliant and keeping clean, well-organised records.
Why does tax credits investigate you?
HMRC also runs checks on tax credit claims. They compare your claim with your tax return, payslips, and other income records. If you’re self-employed as a contractor, HMRC may ask for proof of income, working hours, or childcare costs. Providing accurate records helps avoid overpayment claims, which you may otherwise have to repay.
Can HMRC investigate unpaid wages?
Strictly speaking, unpaid wages are usually an employment law matter rather than a tax issue. However, if HMRC believes undeclared income is involved — for example, if a contractor receives cash-in-hand payments — they may open an investigation. In these cases, the focus is on whether the correct tax and National Insurance were paid.
Do I need to worry if I’ve made an honest mistake?
HMRC recognises that mistakes happen. If you’ve made an error on your tax return, penalties are usually lower if you disclose it voluntarily rather than waiting for HMRC to find it. Contractors should regularly review their accounts with an accountant to catch errors early. A genuine mistake is far less damaging than deliberate concealment.
Do tax investigators really carry iPads?
Yes, many HMRC investigators now use tablets and digital tools when conducting visits. This helps them access records quickly and securely. While this detail may seem small, it shows how seriously HMRC takes modern enforcement — they are increasingly tech-savvy and data-driven.
Can I complain about a tax investigation?
If you feel HMRC has treated you unfairly, you can make a formal complaint. Contractors often use this route if they believe the investigation was disproportionate or unnecessarily prolonged. If the complaint isn’t resolved internally, you can escalate it to the Adjudicator’s Office or even the Parliamentary and Health Service Ombudsman.
Who sells tax investigation insurance?
Insurance can be purchased directly from specialist providers, but most contractors access it through their accountant. Some accountancy firms bundle it into their service packages. Costs vary depending on the level of cover, but it’s generally affordable compared with the potential costs of an investigation.
What’s the best way to avoid a tax investigation?
You can’t eliminate the risk, but you can minimise it. File accurate returns, keep detailed records, don’t claim dubious expenses. Contractors should also check their IR35 status periodically, as HMRC love to investigate those working through limited companies. Be compliant and not only will your risk be less, but you’ll be able to defend yourself quickly if HMRC do pay you a visit.
Important
Any rates and thresholds mentioned in this article are correct at the time of publishing and may be subject to change.
When choosing an accountant, look for one with proven experience and expertise in the contracting sector, particularly around areas like IR35, limited company tax matters and off-payroll working. Formal qualifications are important, but relevant hands-on knowledge matters just as much — especially in a complex and fast-changing landscape like this.
