Running a small business is exciting. You’re focused on winning new clients, looking after your team and growing your business — not necessarily keeping up with every detail of the UK tax system.
But small tax mistakes can quickly become expensive, stressful and time-consuming. Across Surrey, Hampshire and Berkshire, we regularly see the same issues cropping up.
Here are some of the most common small business tax mistakes — and what you can do to avoid them.
Leaving tax planning until the last minute
One of the biggest mistakes is treating tax as something to think about when the deadline arrives.
Good tax planning for small businesses should happen throughout the year. Looking ahead can help you understand your likely tax liability, plan for payments and identify legitimate opportunities to make use of available allowances and reliefs.
It also means fewer surprises when the tax bill arrives.
Mixing business and personal expenses
For owner-managed businesses, it can be tempting to pay for business and personal expenses from the same account. But this can make your records harder to manage and increases the risk of claiming expenses incorrectly.
Keeping clear records of business transactions makes preparing your accounts and tax returns much simpler. It also gives you a clearer picture of how your business is performing.
A separate business bank account and a straightforward bookkeeping system can make a big difference.
Missing allowable expenses
Another common mistake is assuming that every business expense is either too complicated or too small to claim.
Depending on your circumstances, there may be legitimate allowable business expenses and tax reliefs available to you. Missing these can mean paying more tax than necessary.
The key is understanding which costs are genuinely allowable and keeping the right records to support your claims.
This is one area where having an experienced accountant can really pay off. A good accountant will know what to look for and help make sure you aren’t overlooking legitimate opportunities.
Getting VAT wrong
VAT can become increasingly important as a business grows. Mistakes can include failing to recognise when registration is required, using the wrong VAT treatment or reclaiming VAT incorrectly.
If your business is approaching the VAT registration threshold, it is worth taking advice rather than waiting until registration becomes urgent.
Getting your VAT processes right from the outset can save considerable time and hassle later.
Forgetting about deadlines
Corporation Tax, Self Assessment, VAT and payroll all come with their own deadlines. Missing one can create unnecessary pressure and, in some circumstances, penalties.
The answer isn’t simply to remember more dates. Good financial management means having a system in place so that you know what needs to be done and when.
Your accountant should help you stay organised, understand what is due and plan ahead.
Thinking compliance is the whole picture
Perhaps the biggest mistake is viewing your accountant purely as someone who prepares your accounts and tax return.
Your numbers should help you make better decisions.
Whether you’re growing a business in Surrey, Hampshire or Berkshire, proactive financial advice can help you understand cash flow, plan investment, manage tax liabilities and make confident decisions about the future.
At Porter Garland, we believe accountancy should be about more than compliance. It’s about giving business owners the clarity, insight and advice they need to move their businesses forward.
Avoid costly tax mistakes with the right advice
You don’t need to become a tax expert to run a successful business. You need the right support around you.
If you’re looking for experienced accountants for small businesses in Surrey, Hampshire or Berkshire, Porter Garland can help you take control of your accounts, tax and financial planning — with clear, practical advice tailored to your business.
Ready to make your finances work harder for your business? Get in touch with Porter Garland today to arrange a conversation about your business and where you want to take it next. To book a discovery call, click this link: https://bit.ly/3SKEuU5.