Do I Need to Declare a Second Income to HMRC?
Date Published
Side hustles, freelance work and online selling have exploded over the last few years. For some people it is a bit of extra cash on the side. For others it turns into a serious second income alongside full-time employment.
The problem is that many people are unsure when that extra income becomes taxable. Some assume small amounts do not matter. Others believe online income somehow flies under the radar. Unfortunately, that can lead to problems later on.
At Eaves & Co we regularly speak to individuals who are earning additional income but are unsure what they need to declare to HM Revenue and Customs. In many cases, getting advice early prevents stress, penalties and expensive mistakes further down the line.
What Actually Counts as a Second Income?
A second income is essentially any money earned outside of your main employment. That could be freelance work, self-employment, rental income, online sales, consultancy work or even monetised social media content.
One of the biggest misconceptions is that small or casual income does not count. In reality, HMRC looks at whether money is being earned consistently and whether there is an intention to make profit.
Common examples include:
- Selling products through Etsy, eBay or Vinted
- Freelancing alongside a PAYE job
- Airbnb or holiday let income
- Photography, design or trade work completed privately
- Content creation and affiliate income
- Cash-in-hand side work
Even if it started as a hobby, the tax position can change once money starts coming in regularly.
The £1,000 Trading Allowance Explained
There is currently a £1,000 trading allowance available in the UK. This means some individuals can earn small amounts of additional income before needing to register for Self Assessment.
What catches people out is that the allowance relates to turnover, not profit.
For example, if you sold £1,200 worth of handmade products online, HMRC may still expect this to be declared even if your actual profit was relatively small after materials and expenses.
Once income goes beyond the threshold, you will usually need to register for Self Assessment and declare the earnings properly.
Selling Online? HMRC Is Paying Much Closer Attention
Online selling is one of the biggest grey areas at the moment.
Many people clearing out wardrobes or unwanted belongings assume they are trading when in reality they are simply selling personal possessions. Others are effectively running small online businesses without realising HMRC may see it differently.
The key factor is usually intent and consistency.
If somebody is buying stock to resell, creating products for profit or regularly trading online, HMRC may class this as business activity.
Digital platforms are also sharing more information than ever before. The days of assuming online income goes unnoticed are disappearing quickly.
What Happens If You Do Not Declare It?
Ignoring a second income can become expensive surprisingly quickly.
HMRC can issue penalties, charge interest and investigate undeclared earnings going back several years in some situations. Often the stress of receiving letters and trying to untangle old finances becomes far worse than simply dealing with things properly from the start.
In many cases, voluntarily correcting the position early leads to a much better outcome than waiting for HMRC to make contact first.
That is why proper record keeping matters, even for smaller side incomes.
Can You Claim Expenses Against a Side Income?
Usually, yes.
If you are self-employed or operating a side business, certain costs can normally be offset against the income before tax is calculated. This helps reduce the overall tax liability.
Typical allowable expenses may include software, equipment, advertising, travel costs and a proportion of home office expenses depending on the nature of the work.
This is another area where people often get things wrong. Some claim too much and create unnecessary risk. Others claim nothing at all and end up paying far more tax than necessary.
Why It Is Better to Get Advice Early
Most people do not contact an accountant until they are already behind, worried about penalties or trying to respond to HMRC correspondence.
The reality is that early advice is normally far simpler and cheaper.
At Eaves & Co we help individuals understand whether they need to register for Self Assessment, what income needs declaring and how to stay compliant moving forward. We also help ensure expenses are claimed correctly and future tax bills are properly planned for, rather than becoming an unexpected shock in January.
A second income can be a brilliant opportunity. It just needs handling properly from a tax perspective.