Before You Submit: Key Areas to Review on Your UK Self Assessment

The Self Assessment filing deadline is just five days away. For individuals and company directors, the margin for error is increasingly narrow when reviewing figures and submitting their return.

At this stage, the greatest risk is often not missing the deadline itself but submitting a return that has not been properly reviewed. In our experience, most HMRC queries arise from inconsistencies, omissions, or misclassification of income rather than late filing alone.

Taking a short pause to review a few key areas can significantly reduce the risk of amendments, penalties, or paying more tax than necessary after submission.

Income Reporting: A Broader View Is Often Needed

One of the most common causes of HMRC follow-up is incomplete income reporting. While employment income is usually straightforward, other sources are frequently overlooked or misunderstood.

This may include dividends, rental income, savings interest, benefits received through a company, or income earned alongside a main role. Where income does not sit neatly within PAYE, it requires closer attention to ensure it has been reported correctly.

Directors and Shareholders: Accuracy Over Assumptions

For directors of owner-managed businesses, errors often arise from assumptions rather than intent. Dividend figures may not align with company records, salary figures may not match payroll submissions, or personal expenses may have been treated incorrectly.

These issues are rarely obvious at a glance, but they are areas HMRC routinely reviews. Reconciling personal returns with company records before submission can prevent unnecessary queries later.

Property Income: Classification Matters

Property income remains one of the most frequently adjusted areas of Self Assessment. This is often due to misunderstanding which costs are deductible and how mortgage interest relief operates.

Repairs, improvements, and finance costs are treated differently for tax purposes. Incorrect classification can lead to amendments even where the overall figures appear reasonable.

Reliefs and Allowances: Are You Claiming What You’re Entitled To?

Reliefs such as pension contributions and Gift Aid donations are often underclaimed, particularly where higher-rate relief applies.

While missing reliefs does not usually trigger HMRC action, it can result in paying more tax than necessary.

Asset Disposals: Not Just About Tax Due

Capital disposals do not always result in an immediate tax liability, but they may still need to be reported. Sales of property, shares, or crypto assets should be reviewed carefully, particularly where allowances or losses are involved.

Failing to report a disposal can cause issues later, even where no tax is ultimately payable.

Payment Difficulties: Early Action Still Matters

Submitting a return does not automatically resolve the payment position. Where funds are tight, engaging with the issue early is far preferable to ignoring it.

HMRC may agree to payment arrangements in appropriate circumstances. While interest will apply, penalties can often be minimised where action is taken promptly.

When a Second Pair of Eyes Helps

At this late stage, even a focused professional review can make a meaningful difference.

A review is particularly valuable where circumstances are not straightforward, including where there are multiple income sources, business interests, property income, or investment activity.

DRS Tax & Business Advisors support clients with Self Assessment reviews, submissions, and HMRC correspondence, helping ensure returns are accurate, compliant, and proportionate to the risks involved.

Final Thought

A quote from our Principal, Sunil Aggarwal:

“Self Assessment isn’t just a box ticking exercise to be done at speed.  Taking a moment to review the return with a fresh set of eyes can provide real peace of mind, especially where income comes from more than one place. A well checked return not only reduces the likelihood of questions later on, it allows you to submit with confidence and reassurance.”