Managing your own accounts can seem like an easy way to save money, especially if your finances appear straightforward.
For many landlords and small business owners, it’s tempting to think, “It’s only a tax return. I can do it myself.”
Sometimes, that’s true.
But sometimes, trying to save a few hundred pounds in accountancy fees can end up costing thousands in extra tax, interest, penalties, and unnecessary stress.
Here’s a real-life example that shows why.
A Simple Rental Property… Or So It Seemed
A few years ago, we spoke to a potential client who had recently started renting out a property.
The property had only been generating rental income for around six months, so they assumed it was a simple tax return.
After discussing our fees, they decided not to appoint an accountant.
Their reasoning was simple:
“The accountancy fees will eat up all of the rental profit.”
On the surface, that sounds reasonable.
But it overlooked one very important thing…
Tax planning isn’t just about submitting a tax return.
It’s about making sure it’s done correctly.
The Mistake That Triggered an HMRC Enquiry
Fast forward a couple of years.
The landlord received an HMRC enquiry.
What had happened?
The rental property was legally owned by the husband.
However, the rental income had been declared on the wife’s tax return instead.
Why?
Because she was a basic-rate taxpayer with very little other income, while the husband was a higher-rate taxpayer.
The intention made sense.
The paperwork didn’t.
HMRC challenged the arrangement because there was no evidence showing the income could legally be taxed that way.
What Should Have Happened?
This is where professional advice makes all the difference.
Simply deciding to declare rental income in a spouse’s name isn’t enough.
If ownership of a property is changing for tax purposes, the legal paperwork has to support it.
That generally means:
- Completing a Deed of Assignment (or the appropriate legal transfer documentation where applicable).
- Making sure the legal ownership reflects the intended ownership percentages.
- Submitting the correct HMRC forms where required so HMRC recognises the income split.
Missing one step can undo the entire tax planning strategy.
In this case, the couple had attempted some of the paperwork themselves.
Unfortunately, they didn’t complete the full process.
That small oversight led to a much bigger problem.
The Cost of Trying to Save Money
The rental profits totalled around £14,000 over two years.
Because HMRC treated all of the income as belonging to the husband, the profits became taxable at the higher rate.
Instead of paying little or potentially no tax as originally intended, they were now facing:
- Around £5,600 in additional tax
- Interest on the overdue tax
- Possible penalties
- The cost of responding to an HMRC enquiry
All because they wanted to avoid paying a few hundred pounds in professional fees.
Penny Wise, Pound Foolish
This is a classic example of being penny wise and pound foolish.
Trying to save money isn’t the problem.
Trying to save money without understanding the rules is.
A tax return isn’t simply entering numbers into software.
The real value comes from understanding:
- What HMRC expects
- What documentation is required
- Which tax planning opportunities are available
- How to evidence those decisions if HMRC asks questions later
That’s where professional advice earns its keep.
Can You Do Your Own Tax Return?
Absolutely.
For some people, DIY accounting is perfectly reasonable.
If your affairs are genuinely simple and you understand the rules, it can work well.
The problem is that many people assume their situation is simple when it isn’t.
Property ownership, spouses, higher-rate tax, capital gains, mortgages, and legal ownership can quickly turn a straightforward tax return into something much more technical.
That’s often where expensive mistakes happen.
Property Tax Planning Is More Than Filling in Forms
One of the biggest misconceptions is that tax planning happens when you submit your return.
In reality, most tax planning happens before the tax return is prepared.
For landlords, that could include:
- Choosing the right ownership structure.
- Understanding how rental income should be taxed.
- Planning around higher-rate tax thresholds.
- Keeping the correct legal documents in place.
- Making sure HMRC has been notified where necessary.
These are decisions that can save thousands but only if they’re made correctly.
The Value of Good Advice
A good accountant doesn’t just file paperwork.
They help you avoid problems before they happen.
That means:
- Spotting tax-saving opportunities.
- Making sure the correct documentation is in place.
- Helping you stay compliant with HMRC.
- Giving you confidence that your affairs are structured properly.
It’s much easier and usually much cheaper to get things right at the beginning than to fix them after an HMRC enquiry.
There’s nothing wrong with trying to save money.
But before deciding to do everything yourself, ask whether you’re saving money—or simply delaying a much bigger bill.
Sometimes the cheapest option today becomes the most expensive option tomorrow.
When it comes to tax and property, good advice isn’t just about paying less tax.
It’s about making sure you don’t accidentally create a problem that costs far more to fix than it would have cost to prevent.
