For many individuals and business owners, completing a self-assessment tax return feels like a straightforward way to save money. With online filing systems readily available and an increasing amount of information accessible online, it can be tempting to manage your tax affairs yourself.
In many cases, a DIY approach works well. However, there comes a point where handling your own tax return can start costing more than it saves, often without you even realising it.
The issue is not always about making mistakes. Sometimes the biggest cost comes from missed opportunities, overlooked reliefs, or a lack of forward planning.
Tax returns become more complicated than many people realise
A common assumption is that self-assessment tax returns only apply to self-employed individuals. In reality, a wide range of people may need to complete a tax return, including company directors, landlords, individuals with investments, people with overseas income, and higher earners affected by the Higher Income Child Benefit Charge. Even those earning more than £1,000 through a side hustle may have reporting obligations.
The challenge often arises when multiple income streams are involved. A sole trader with one source of income may find their tax affairs relatively straightforward. However, add rental properties, investment income, savings interest, or capital gains into the mix, and the picture becomes significantly more complex.
Understanding how different income sources interact with each other from a tax perspective is where DIY tax preparation can start becoming costly. What appears to be a simple return may involve tax rules, allowances, and reliefs that are easy to overlook. Read our tips for filling in your self-assessment tax return.
The hidden cost of missed reliefs and allowances
One of the biggest risks of preparing your own tax return is not underpaying tax but in fact overpaying it.
Many taxpayers are unaware of reliefs they may be entitled to claim. Pension contribution relief is a good example. Higher-rate and additional-rate taxpayers can often claim additional tax relief on pension contributions through their tax return, yet many fail to do so.
Other commonly overlooked areas include Gift Aid donations, Marriage Allowance claims, and the ability to carry forward business losses from previous years. For business owners, understanding how and when losses can be offset against future profits can have a significant impact on the amount of tax paid.
In some cases, missed reliefs can be reclaimed retrospectively, but the process is often time-consuming and administrative. Claims relating to older tax years may require amended paper returns and supporting documentation, creating additional work and cost that could have been avoided in the first place.
Tax planning matters more than tax reporting
Many people view their tax return as a compliance exercise; a form that needs to be completed and submitted to HMRC once a year.
The reality is that a tax return is simply a record of what has already happened. Once the tax year has ended, most opportunities to reduce your tax liability for that period have passed.
Tax planning is different. It focuses on future decisions and opportunities. Regular reviews of income, profits, investments, pension contributions, and planned expenditure can help identify legitimate ways to improve tax efficiency before the year ends.
This is particularly important for business owners. Decisions such as making pension contributions, investing in equipment, or restructuring income can often have tax benefits, but only if they are considered at the right time.
Knowing when to seek professional support
One of the clearest signs that someone has outgrown the DIY approach is when completing a tax return becomes stressful, time-consuming, or uncertain. Seeking help and outsourcing your tax preparation can provide reassurance that your tax affairs are being handled efficiently and in line with the latest HMRC requirements.
Multiple income streams, major life events, property investments, business growth, inheritance matters, or international tax considerations can all introduce complexity that may warrant professional tax accountant advice.
It is also worth considering the value of your time. While preparing your own return may appear cheaper on the surface, the hours spent gathering information, researching tax rules, and worrying about potential mistakes can quickly outweigh the cost of professional tax preparation services.
Perhaps most importantly, professional advice can help identify opportunities that would otherwise be missed. In many cases, the value generated through tax preparation and planning services significantly exceeds the cost of the advice itself.
Get in touch with the team
At Hayward Wright, we support individuals, business owners, landlords, company directors, and investors with self-assessment tax returns, proactive tax planning, and wider financial advice. Whether your tax affairs are becoming more complex or you simply want reassurance that everything has been completed accurately and tax-efficiently, our team are here to help.