Five Capital Gains Tax Mistakes to Avoid

One conversation has always stayed with me.

A married couple came to see me after the wife had sold a rental property. The sale had already completed, and they wanted to understand how much Capital Gains Tax would be payable.

As we talked through the history of the property, it became clear that she had owned it entirely in her own name. Had they taken advice before contracts were exchanged, it may have been possible to transfer a share of the property to her husband. At the time, that could have allowed them to make use of both annual exemptions that were available, reducing the overall Capital Gains Tax liability.

Unfortunately, by the time we met, that opportunity had passed.

Nobody had done anything wrong. They simply didn't realise that the tax conversation needed to happen before the sale rather than afterwards.

It's amazing how often I hear clients say, "I wish I'd spoken to you six months ago."

Over the years, I've found that most Capital Gains Tax problems aren't caused by complicated legislation. More often than not, they're the result of perfectly sensible people making important decisions before they've had the opportunity to take advice.

Here are five of the most common mistakes I've seen over the years.

1. Waiting until after contracts have been exchanged

This is probably the one I encounter most often.

A client telephones and says,

"We've exchanged contracts and our solicitor suggested we should speak to a tax adviser."

By then, many planning opportunities have already disappeared.

Whether you're selling an investment property, inherited property or development land, the best time to seek advice is before you become legally committed.

Early advice doesn't always reduce the tax bill, but it nearly always provides certainty.

2. Assuming property sales are always tax-free

Another conversation I have regularly starts with,

"It's only property, surely there's no tax to pay?"

Sometimes that's true.

If you've lived in a property as your only or main residence throughout your period of ownership, relief may be available. However, rental properties, second homes, inherited properties and even the sale of part of your garden can all produce very different tax outcomes.

If you're unsure how the rules work, you may find our guide to Capital Gains Tax on Property in the UK: Rules Many Owners Misunderstand helpful. If the property has been your home, it's also worth reading Principal Private Residence Relief: Common Capital Gains Tax Misunderstandings.

3. Forgetting about HMRC's reporting deadlines

One of the biggest surprises for many clients is discovering that selling a property doesn't always end with completing their annual tax return.

Certain property disposals must be reported to HMRC within strict deadlines.

I've had clients who have carefully budgeted for the tax but had no idea that the reporting requirements came long before the Self-Assessment deadline.

It's an easy mistake to make if you've never sold this type of property before.

4. Throwing away records that later become valuable

Most people don't keep invoices because they're thinking about Capital Gains Tax.

They keep them because they've had an extension built, replaced the windows or renovated the kitchen.

Years later, those same invoices may help support improvement costs that reduce a Capital Gains Tax liability.

I often tell clients that good record keeping is one of the cheapest forms of tax planning they'll ever undertake.

5. Assuming every property profit is a capital gain

This one surprise people.

Sometimes clients are worried about paying Capital Gains Tax when the bigger question is whether HMRC might argue the profits should actually be taxed as trading income.

This can happen where land is developed, several plots are sold or significant work has been carried out before disposal.

The tax difference can be considerable, which is why I always encourage clients to take advice before starting a development project.

If you're considering selling development land, you may also find Selling Part of Your Garden or Land: When Capital Gains Tax Applies and Property Development: Capital Gain or Trading Income? useful.

Jonathan's Tip

One thing I've learnt over the years is that tax planning is rarely about finding clever solutions.

More often, it's about having the right conversation at the right time.

A fifteen-minute discussion before contracts are exchanged can often be far more valuable than several hours spent trying to resolve matters after the transaction has completed.

A final thought

Looking back over the hundreds of Capital Gains Tax matters I've advised on, there is one lesson that comes up again and again.

People rarely regret asking for advice too early.

They do, however, often regret asking too late.

If you're planning to sell property, land or other valuable assets, don't assume the tax position is straightforward simply because the transaction seems simple.

A conversation before contracts are exchanged could help you understand your options, avoid unexpected surprises and give you confidence that you're making informed decisions.

If that's a conversation you'd like to have, my team and I would be delighted to help.