Capital Gains Tax When Selling a Buy-to-Let in Wales

Selling a buy-to-let in Wales can trigger Capital Gains Tax on the profit you've made since you bought it, and the deadline to report and pay it is tighter than most landlords expect: 60 days from completion, not the following January's tax return. Get the timing wrong and HMRC charges interest and penalties even where no tax turns out to be due.

Last updated: 17 July 2026

This is general guidance, not tax advice. Figures and rates below are for the 2026/27 tax year and may change in a future Budget. Every landlord's tax position is different, so speak to a qualified accountant before you sell, and always check current figures on gov.uk rather than relying on any figure quoted here.

Who pays Capital Gains Tax when you sell a buy-to-let?

If you're an individual landlord and you sell (or otherwise dispose of) a rental property for more than you paid for it, the profit is a capital gain and is potentially taxable. This applies whether you've owned the property for one year or twenty, and whether you sell to an owner-occupier, another investor, or Morgan Jones's own book of landlord buyers with the tenancy still running. It applies to properties held personally; if you hold property through a limited company, the tax treatment is different (corporation tax, not Capital Gains Tax) and needs its own conversation with an accountant.

What are the Capital Gains Tax rates for 2026/27?

For the 2026/27 tax year, individuals pay Capital Gains Tax on residential property at 18% if the gain falls within your basic rate income tax band, or 24% on any part that falls in the higher or additional rate band. These are now the general Capital Gains Tax rates for individuals, not a separate residential-property rate; the two were unified from 30 October 2024. Which band you fall into depends on your total income plus the gain in that tax year, so a large gain can push part of it into the higher rate even if your normal income is modest.

Every individual also gets an annual exempt amount of £3,000 for 2026/27, deducted from your total gains for the year before tax is worked out. It's per person, not per property, and it's use-it-or-lose-it: you can't carry an unused allowance into a future year.

How is the gain calculated? A worked example

The basic calculation is: sale price, minus what you originally paid, minus allowable costs. Here's an illustrative example with round numbers, not a real transaction:

Item	Amount
Sale price	£180,000
Purchase price	£120,000
Solicitor fees (purchase and sale, combined)	£2,000
Estate agent fees on sale	£3,000
Loft conversion (capital improvement)	£15,000
Gain before allowance	£40,000
Less annual exempt amount	£3,000
Taxable gain	£37,000

Tax due on that £37,000 depends on your income tax band: at 18% (basic rate) that's £6,660; at 24% (higher or additional rate) that's £8,880. Many landlords sit across both bands, with part of the gain taxed at each rate. This example is illustrative only; your own figures, costs and tax position will differ.

Which costs can you deduct from the gain?

Allowable costs generally include what you paid to buy and sell the property (solicitor and estate agent fees, for example) and money spent on genuine capital improvements, such as an extension or a loft conversion that adds to the property's value. Routine repairs, redecorating, and general maintenance don't count. Those keep the property in good condition; they don't improve on what it originally was, so HMRC treats them as running costs rather than part of the gain calculation.

In Wales, buying the property would have meant paying Land Transaction Tax (LTT) rather than Stamp Duty Land Tax (SDLT), since LTT has applied to property transactions here since April 2018, administered by the Welsh Revenue Authority. HMRC guidance confirms SDLT counts as a deductible acquisition cost; LTT, as the Welsh equivalent, would reasonably be treated the same way, though HMRC's published guidance doesn't name LTT specifically, so confirm this point with your accountant before relying on it.

What if you once lived in the property yourself?

If the property was ever your main home before you let it out, an "accidental landlord" scenario, Private Residence Relief (PRR) covers the period you lived there, plus the final 9 months of ownership are always treated as exempt regardless of whether you were living there at the end (36 months applies instead if you or your partner are disabled or moved into care). This can significantly reduce the taxable gain if the property was your home for a meaningful chunk of the time you owned it.

Lettings relief is often remembered as a bigger relief than it actually is now. It only applies where you were living in the property alongside your tenant, sharing occupation, not the standard buy-to-let scenario where you've let out the whole property while living elsewhere. If you never lived in the property at all, PRR and lettings relief don't apply, and the full gain (less costs and the annual exempt amount) is potentially taxable.

The 60-day reporting deadline

UK residential property disposals by individuals must be reported to HMRC, and any tax paid, within 60 days of completion, using HMRC's UK Property Account. This applies even if PRR, your annual exempt amount or allowable costs mean no tax is actually due; the reporting obligation stands on its own. Miss the deadline and HMRC can charge late-filing penalties and interest on top of any tax owed, so this needs to be on your list from the day you exchange, not the day you next think about your tax return.

Selling to a spouse or civil partner

Transfers of property between spouses or civil partners who are living together happen on a "no gain, no loss" basis for Capital Gains Tax, meaning no CGT arises on the transfer itself; the receiving spouse simply inherits the original acquisition cost for when they eventually sell. This is a genuine planning basic worth knowing, for example where one partner has unused allowance or sits in a lower tax band, though the detail depends on your circumstances and is worth discussing with an accountant. For separated couples, this treatment can still apply up to the end of the third tax year after separation, or later under a formal separation agreement.

Does selling with tenants still living there change the tax position?

No. Whether the property is tenanted or empty on the day it completes doesn't change the Capital Gains Tax calculation; the tax is based on what you paid, what you sold for, and the reliefs above, not on who's living there at completion. What it does change is how the sale is marketed and who's likely to buy it. Morgan Jones's sales team markets tenanted properties directly to its own book of investor-landlord buyers, so a sale doesn't have to mean ending the tenancy first. See selling your rental property for how that works.

Weighing up whether to sell

If the numbers above make selling look worthwhile, our sales team can talk through a tenanted sale without disrupting your contract-holders, and a quote costs nothing to get. If the sums point the other way and the property still works better held, our letting agent vs self-managing comparison and landlord services overview cover what changes if you bring in management rather than sell. If your rental sits within a wider portfolio, our portfolio and limited-company landlords guide covers what else scales with more than one property.

Frequently Asked Questions About Capital Gains Tax on Buy-to-Lets in Wales

Is this page tax advice?

No. This is general guidance for landlords in Wales, current for the 2026/27 tax year as far as we've been able to verify against gov.uk, but it isn't a substitute for advice from a qualified accountant who knows your full circumstances. Always confirm current rates and rules before acting.

Do I have to pay Capital Gains Tax if I sell at a loss?

No. A loss can be offset against other gains in the same tax year, or carried forward to reduce a future year's taxable gain, provided you report the loss to HMRC. There's no tax to pay on a loss itself.

Do I still need to report the sale if no tax is due?

Generally yes. The 60-day reporting obligation for UK residential property applies even where reliefs, costs or your annual exempt amount bring the tax due down to nothing, so check whether your specific sale needs reporting rather than assuming it doesn't.

Does selling with a tenant in place affect how much tax I pay?

No, the Capital Gains Tax calculation is the same whether the property is tenanted or vacant at completion. It's the sale process, not the tax, that differs.

I lived in the property years ago before renting it out. Does that help?

It can. Private Residence Relief covers the years you lived there plus the final 9 months of ownership regardless. How much it reduces your bill depends on how long you lived there against how long you owned it overall, so it's worth an accountant working through the exact figures.

Can I transfer the property to my spouse to reduce the tax?

Transfers between spouses or civil partners living together are treated as no gain, no loss for Capital Gains Tax, which can be a useful planning basic depending on both partners' income and allowances. This needs proper advice rather than a DIY approach.

What counts as a deductible cost when working out the gain?

Buying and selling costs (solicitor and estate agent fees) and genuine capital improvements such as an extension. Repairs, redecorating and general maintenance don't reduce the gain.

Where can I check the current rates myself?

HMRC publishes current Capital Gains Tax rates and the annual exempt amount on gov.uk, and that's the source to check before budgeting for a sale, since rates and allowances can change with each Budget.