For many taxpayers, completing a Self-Assessment tax return is relatively straightforward. However, when your affairs involve multiple income sources such as investments, property, trusts, overseas assets, share transactions, cryptoassets, or significant wealth, the risks of getting things wrong can increase dramatically.
HMRC continues to focus its compliance activity on higher-risk and more complex tax returns, making accuracy more important than ever. Even seemingly minor omissions can result in additional tax liabilities, penalties, interest charges, and time-consuming enquiries from HMRC.
At ETC Tax, we specialise in complex Self-Assessment tax returns and regularly help clients identify issues that might otherwise be overlooked.
Here are five of the most common and costly mistakes we see.
One of the most common errors is assuming that HMRC already has all the information it needs.
Many taxpayers correctly declare employment income, but overlook:
HMRC receives increasing amounts of information directly from banks, employers, investment platforms, letting agents, and overseas tax authorities. If income is omitted, HMRC may identify the discrepancy and open an enquiry.
The challenge with complex tax returns is that income can arise from numerous sources and sometimes in ways that are not immediately obvious. At ETC, we complete a thorough review of your circumstances to ensure nothing is missed.
While many taxpayers worry about underpaying tax, overpaying tax is often just as common.
Complex returns frequently involve reliefs that can significantly reduce a tax liability, including:
Failing to claim available reliefs can result in paying substantially more tax than necessary.
Identifying these opportunities requires more than simply entering figures into a tax return. It requires understanding the wider picture and asking the right questions about investments, charitable giving, pensions, and previous transactions.
Capital Gains Tax (CGT) is one of the areas where mistakes frequently occur.
Many people assume calculating a gain is simply a matter of deducting the purchase price from the sale proceeds. In reality, the rules can be significantly more complex.
Common issues include:
A poorly calculated capital gain can result in either overpaying tax or creating unnecessary risk of an HMRC challenge.
International tax matters are becoming increasingly common, even for individuals who consider themselves UK-based.
Potential issues can arise where you have:
Double tax relief claims, residence rules, remittance issues, and foreign tax reporting requirements can all create complications.
Many taxpayers are unaware that overseas income often still needs to be disclosed to HMRC, even where tax has already been paid abroad.
Getting these rules wrong can be costly and may attract additional HMRC scrutiny.
Perhaps the biggest mistake of all is viewing a tax return as simply an annual form-filling exercise.
A Self-Assessment tax return is often the best opportunity to review your wider tax position and identify:
Many taxpayers only focus on submitting the return before the deadline, without considering whether their affairs are structured tax efficiently.
A properly prepared tax return should not only ensure compliance but also help you understand your overall tax position and future planning opportunities.
How ETC Tax Can Help
At ETC Tax, we specialise in complex self-assessment tax returns, specifically Multiple income sources
What makes our approach different is the amount of time we spend understanding your circumstances.
Rather than simply asking for figures, we ‘factfind’ by asking detailed questions about your income, investments, assets, transactions, and plans. This allows us to identify issues that may otherwise be overlooked and helps ensure your return is as accurate and tax-efficient as possible.
We believe that attention to detail is critical when dealing with complex tax affairs. Often, the most valuable information emerges through conversations and questions that many standard tax return processes never cover.
Next Steps
If your tax affairs are becoming more complex, or you simply want reassurance that everything has been reported correctly, our specialist team can help.
Complete our online enquiry form and a member of our team will be in touch.
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