As we approach the end of the tax year, many business owners are thinking about pensions and ISAs — but far fewer are making the most of their Capital Gains Tax allowance UK rules.
Used correctly, your CGT allowance can reduce or even eliminate tax on gains. Used incorrectly… it can quietly go to waste.
👉 Your Capital Gains Tax (CGT) allowance
And missing it can quietly cost you money.
What is the Capital Gains Tax allowance in the UK?
Each tax year, you’re entitled to a £3,000 tax-free Capital Gains allowance.
This means you can make gains up to this amount without paying any CGT.
Simple enough.
But where it gets more complicated is when gains and losses happen in the same tax year.
*Understanding how the Capital Gains Tax allowance UK works is key to avoiding unnecessary tax.
A common Capital Gains Tax allowance mistake
Let’s say you’ve already made a gain this year perhaps from selling shares, cryptocurrency, or property and that gain is within your £3,000 allowance.
So far, so good.
Now imagine you sell another asset at a loss before 5 April.
Sounds sensible, right?
Not always.
👉 That loss is automatically used to reduce your gain
👉 Your gain drops to £0
👉 And your £3,000 allowance is effectively wasted
The result?
❌ No tax saved
❌ Your allowance gone
❌ Lost opportunity to use that loss in a future year
Why timing matters for your Capital Gains Tax allowance
Capital losses are applied in a specific order:
- They first reduce gains in the same tax year
- Any excess losses are carried forward
- They are then used against future gains above your allowance
So if your gains are already covered by your allowance, triggering a loss now doesn’t help you it can actually work against you.
In some cases, it’s far more tax-efficient to:
👉 Delay selling at a loss until after 5 April
This means:
- Your current year allowance is fully used
- The loss is carried forward
- You can use it more effectively against future gains
A quick example
- You make a gain of £2,500
- You then sell another asset at a £4,000 loss before 5 April
Result:
- Gain reduced to £0
- Your £3,000 allowance is unused
- £1,500 of loss carried forward
👉 You’ve effectively wasted your allowance
If you had waited until the new tax year to realise the loss:
✔ Your £2,500 gain would be tax-free
✔ Your £4,000 loss could be used in a future year
✔ You’d be in a stronger tax position overall
The trap to avoid
It’s easy to assume that triggering a loss before the tax year ends is always a good idea.
But with CGT, that’s not always the case.
⚠️ Acting too quickly can reduce the effectiveness of your tax planning
⚠️ The order of transactions really does matter
How to protect your Capital Gains Tax allowance
Before making any last-minute decisions:
✔ Review any gains you’ve already made this year
✔ Consider whether losses should be delayed
✔ Look at the bigger picture not just this tax year
Final thought
With Capital Gains Tax, it’s not just about what you do it’s about when you do it.
A small timing decision now could make a significant difference to your tax bill later.
*With the Capital Gains Tax allowance UK set at £3,000, careful planning is more important than ever.
Need help reviewing your position?
If you’ve sold or are thinking about selling shares, crypto, or property, it’s worth getting advice before the tax year closes.
At Jenner’s Tax & Business Advisers, we help you stay one step ahead and make sure you’re not missing opportunities or paying more tax than you need to.
📞 Call us on 01432 379988
Or contact us here to arrange a quick review.