Is Capital Gains Tax Eating Into Your Profits? Here’s How to Keep More

You sell something big—a flat, a few shares, maybe even a lucky punt on cryptocurrency—and the numbers look great. Until you realise the profit isn’t all yours. Somewhere between the sale price and the spreadsheet, Capital Gains Tax (CGT) sneaks in to claim its share.

CGT applies to the gain—the profit above what you originally paid—and the rate depends on both your income and the type of asset you’ve sold. It’s not a trap, but it can feel like one if you don’t see it coming.

The upside? With a little foresight (and a few well-timed reliefs), you can plan ahead, use your allowances wisely, and make sure more of your hard-earned profit ends up where it belongs—back in your pocket.

What is Capital Gains Tax?

At its simplest, Capital Gains Tax (CGT) is a tax on the profit you make when selling or disposing of certain assets. It’s not about what you receive in total—it’s about the gain you make above what you originally paid.

You’ll usually pay CGT when you sell:

• Residential property or buy-to-let real estate
• Shares or investments outside of an ISA
• Business assets such as goodwill or equipment
• Personal possessions worth more than £6,000 (like art, jewellery, or collectibles)

Not everything is taxable. Your main residence generally qualifies for Private Residence Relief, which means most people won’t pay CGT on the sale of their home.

Your taxable gain combines with your taxable income to determine your overall tax liability, and HMRC applies your CGT rate accordingly. The CGT allowance—the amount of gains you can make tax-free each year—helps reduce the final bill.

📌 Pro Tip: Keep detailed records of every sale, cost, and improvement. HMRC only taxes the gain, but you’ll need paperwork to prove what that gain actually was.

The current rate of CGT in the UK

Capital Gains Tax (CGT) rates in the UK depend on your income level and the type of asset you sell. Unlike in the US, there’s no distinction between short- and long-term gains—HMRC simply looks at your total income for the year, adds your taxable gain on top, and applies the rate that fits.

For the 2024–25 tax year, the rates are:

• Basic rate taxpayers: 10% on most assets, 18% on residential property
• Higher and additional rate taxpayers: 20% on most assets, 24% on residential property

That 24% rate is new for 2024–25, down from 28%, and it’s aimed at encouraging sales of second homes and buy-to-lets without heavily penalising investors.

Your total taxable gain—the profit after deducting buying and selling costs—is added to your taxable income to decide how much falls into each tax band. Your CGT allowance (currently £3,000) gives you a small tax-free buffer, but any gains above this are taxed at the relevant rate.

Most people don’t pay CGT when selling their main home, thanks to Private Residence Relief, but second homes, shares, and other capital assets are subject to the standard rates.

📌 Pro Tip: If your total income sits near the basic rate threshold (£50,270), plan your disposals carefully. Selling part of an investment before the tax year ends—and the rest after 6 April—can legally keep more of your gains in the lower rate band.

The annual exempt amount and other allowances

Every tax year, you get a small buffer against Capital Gains Tax (CGT) called the annual exempt amount—currently £3,000 for individuals in 2024–25. It’s not huge, but it can make a difference, especially when combined with smart planning.

Here’s how it works:

• Gains below £3,000 fall within the allowance, so no CGT is due.
• Spouses and civil partners can transfer assets between them tax-free, effectively doubling their allowance to £6,000.
• The allowance applies to all gains combined, not per asset—so it’s worth tracking your disposals throughout the year.

For higher earners, this allowance can help reduce how much of your gain tips into the higher rate CGT band. And if you’re investing regularly, using ISAs and pensions can shelter your investments entirely—these wrappers grow tax-free and don’t attract CGT when you sell.

Full details and thresholds are listed on GOV.UK, updated annually with the new tax year.

📌 Pro Tip: If you’re close to your allowance limit, consider spreading asset sales over two tax years. It’s one of the simplest legal ways to keep your profits in the tax-free zone.

Using capital losses to reduce your tax bill

Not every investment ends in a win—but even losses can work in your favour. Under UK tax rules, capital losses can offset your gains, helping you reduce the amount of Capital Gains Tax (CGT) you owe for the year.

Here’s how it works:

• Losses from chargeable assets (like shares, property, or business assets) can be used to offset gains in the same tax year.
• If your losses exceed your gains, you can carry them forward to offset against future profits—there’s no time limit, as long as you’ve reported them to HMRC.
• You must record transactions using market value at the time of disposal, even if the sale was to a family member or at a discount, to ensure accurate CGT calculations.

This system effectively shrinks your taxable gain before income tax rates or capital gains tax rates are applied—sometimes reducing your bill to zero if you combine it with your tax-free allowance.

📌 Pro Tip: Always report losses, even in quiet investment years. Logging them with HMRC keeps them on record, ready to offset future gains when the market (or your luck) turns around.

Property and real estate: The most common trigger

When it comes to Capital Gains Tax (CGT), property is where most people get caught out. Selling your main home is often tax-free, but anything beyond that—buy-to-lets, second homes, or investment properties—can create a taxable gain.

Here’s what you need to know:

• Private Residence Relief usually protects your main home, but only if you’ve lived in it as your main residence for the full ownership period.
• Buy-to-let and second homes don’t qualify for full relief, meaning gains are typically taxable once you exceed your annual exemption.
• You must report and pay any CGT on UK residential property within 60 days of the sale—missing the deadline can trigger penalties and interest.
• Non-resident owners of UK real estate have the same reporting obligations, even if no tax is due.

When calculating your gain, use market value at the date of sale and include allowable costs (like legal fees or stamp duty) for accurate tax purposes. If the sale results in a loss, remember—you can carry it forward to offset future property gains.

📌 Pro Tip: If you’re planning to sell an investment property, get your valuation and paperwork ready before you exchange contracts. Those 60 days move fast, and HMRC waits for no one.

Capital gains on shares, crypto, and other assets

Capital Gains Tax (CGT) doesn’t just apply to property—it also covers profits from selling shares, funds, cryptocurrency, and other chargeable assets. If your total gains from these sales exceed your annual allowance, HMRC expects a share of the profit.

Here’s how it breaks down:

• Shares and funds: Gains from selling investments outside an ISA or pension are taxable once you pass your allowance.
• Cryptocurrency: Treated like shares for tax purposes—if you sell, swap, or spend crypto and make a gain, it counts toward your CGT total.
• Business owners: If you sell company shares or assets, you might face both CGT and Corporation Tax, depending on how your business is structured.
• Savings accounts: These don’t trigger CGT—interest is treated as income and taxed under separate rules.
• Tax-efficient wrappers: Investments held in ISAs or pensions grow free of CGT, making them a powerful long-term shield against tax.

If you’ve made a loss on any of these assets, you can carry it forward to offset future gains—so even a bad trade can soften next year’s tax bill.

📌 Pro Tip: HMRC cross-checks data from brokers and crypto exchanges, so always report disposals—even small ones. It’s easier to correct a minor gain now than to explain a missing one later.

Reducing your CGT liability through planning

You can’t escape Capital Gains Tax (CGT) entirely—but smart timing and strategy can make a real difference to how much you pay. A bit of foresight can turn a hefty bill into a manageable one.

Here’s how to keep more of your gains:

• Time your disposals: Spread sales across two tax years to use multiple annual exempt amounts.
• Share the load: Transfer assets between spouses or civil partners tax-free to make use of two allowances instead of one.
• Claim available reliefs: Reliefs like Business Asset Disposal Relief (formerly Entrepreneurs’ Relief) can cut the rate to 10% for qualifying business disposals—a big help for the self-employed.
• Offset gains with losses: Use losses from the same year—or carry forward losses from previous years—to reduce your taxable total.
• Stay policy-aware: Keep an eye on the Autumn Budget, where CGT rates and thresholds often shift with little warning.

Effective planning doesn’t just reduce your tax bill—it also gives you flexibility in how you manage your portfolio, your business, and your cash flow.

📌 Pro Tip: Don’t wait until the sale to think about tax. A quick pre-sale chat with an accountant can reveal reliefs and timing tricks that save thousands—before HMRC ever gets involved.

Filing and paying your CGT bill

Once you’ve calculated your Capital Gains Tax (CGT), it’s time to report and pay. For most taxpayers, this happens through the Self Assessment tax return, though property sales have their own standalone reporting system.

Here’s how it works:

• Reporting: Include your total gains and any tax relief claimed (like Business Asset Disposal Relief or Private Residence Relief) on your Self Assessment tax return.
• Property sales: If you’ve sold a UK residential property, report and pay within 60 days of completion using HMRC’s online CGT service.
• Payment deadlines: For Self Assessment, CGT is usually due by 31 January following the tax year of the gain.
• Payment options: Pay by online banking, bank transfer, or debit/credit card via your HMRC online account—most methods clear within three working days.
• Overpayments: If you’ve overpaid or qualified for additional tax relief after filing, HMRC can issue a repayment or credit it toward next year’s bill.

Missing the deadline triggers late payment interest and possible penalties, so it’s worth marking those dates early in your calendar.

📌 Pro Tip: Don’t wait for HMRC’s nudge—reporting property gains early not only avoids fines but also gives you peace of mind (and one less January panic).

Keeping more of what you earn

Capital Gains Tax doesn’t have to feel like a punishment for doing well—it’s just a system to navigate. With a bit of planning, smart timing, and awareness of your allowances, you can turn what feels like a bite out of your profit into a small nibble.

If you’d like tailored guidance, book a free consultation with a qualified adviser through Unbiased. You’ll get clear, practical advice on CGT reliefs, timing strategies, and how to structure your investments to keep more of what’s yours—legally, efficiently, and with zero last-minute surprises.

Frequently Asked Questions (FAQ)