Selling BTC for a house deposit can make your purchase more certain. It is worth it only if the after-tax cash meets your target.
Selling Bitcoin may trigger Capital Gains Tax in the UK. The 2025/26 annual CGT allowance is £3,000.
You must also show your lender where the money came from. Future Bitcoin growth is not the only risk.
Your usable deposit is net cash, not BTC value
Your usable deposit is the cash left after tax, fees and checks. It is not the Bitcoin value shown in an exchange app.
Work from the property price backwards
Start with the property price and the mortgage you can afford. Then find the deposit your lender requires.
Add buying costs and a separate tax reserve. Then decide how much BTC to sell.
A sound target is a cash deposit that still works after reserving 100% of the estimated CGT bill. Also reserve known buying costs and several months of essential living costs. The BTC sale value alone is not the decision figure.
The deposit must work in pounds, not Bitcoin.
SDLT relief does not depend on Bitcoin
First-time buyer SDLT relief can reduce the cash needed at completion. Check it before setting your Bitcoin sale target.
In 2025/26, eligible first-time buyers usually pay no SDLT on the first £300,000. This applies to homes costing £500,000 or less.
Purchases above £500,000 do not qualify for this relief. The relief does not depend on whether your deposit came from Bitcoin.
Your costs may include a solicitor, survey and mortgage valuation. They may also include arrangement fees, removals and insurance.
Use confirmed quotes where possible. Keep these costs apart from your deposit and CGT reserve.
Your BTC sale creates CGT before you buy
Selling Bitcoin for pounds is normally a disposal. A disposal can create Capital Gains Tax, even when every pound funds your deposit.
Calculate the gain in GBP
Your capital gain is usually sale proceeds minus your BTC purchase cost. You can also deduct allowable costs, such as exchange trading fees.
It is not simply the pounds sent to your bank. Think of it like selling a car for more than you paid.
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Picked for you
A current UK crypto tax book can help organise trade records before a sale. It works best as a check on terms and record keeping. It does not replace personal tax advice.
- It explains capital gains records in pounds, rather than only exchange balances.
- It helps identify purchase dates, fees and wallet transfers for a CGT calculation.
- It gives you a reference when preparing papers for an adviser or accountant.
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Buying a house gives no tax relief
A Bitcoin disposal does not usually use the 60-day UK property reporting process. However, you may still need to report the gain through Self Assessment.
For example, report a sale in the tax year ending 5 April 2026 by 31 January 2027. Tax is usually due by that same date when Self Assessment applies.
A later payment date does not remove the tax bill. Set aside the estimated CGT as soon as you sell.
The most frequent error is spending the full sale proceeds. This can leave you with too little cash when the tax bill arrives.
Keep GBP values for every purchase and sale date. Keep transaction IDs, trading fees and proof of transfers between your own wallets.
Sell enough BTC to survive timing and checks
Sell enough BTC to protect the deposit, estimated tax and costs in pounds. Do this before exchanging contracts.
Do not rely on a later Bitcoin price rise. A live property deal has its own timetable.
Compare sale routes before choosing one
| Approach | Cash locked for deposit | BTC price exposure | Best fit |
|---|
| Sell in one transaction | 100% once withdrawn | 0% on sold amount | Offer accepted or completion is close |
| Staged sales | Builds over days or weeks | Falls as each sale completes | Viewing stage with no fixed completion date |
| Keep BTC until later | 0% | 100% | Deposit is already fully funded in cash |
Selling in one transaction gives you the clearest cash figure. It also ends price exposure on the BTC sold.
Staged sales spread price risk across days or weeks. However, they leave part of your deposit exposed to a fall.
Keep BTC until later only when cash already covers the full deposit. This route does not suit a time-sensitive offer.
Keep a traceable document trail
This guidance is less relevant if you have no BTC to sell. The guidance also differs outside England, where property-tax rules can change. Seek specialist advice for BTC held through a company, trust or similar structure. It also does not cover borrowing against crypto. This is not personal tax, legal or regulated mortgage advice.
Mortgage lenders and conveyancing solicitors usually check crypto proof separately from the deposit amount. Prepare a dated trail from purchase through to your UK bank account.
Keep evidence of the original Bitcoin purchase and wallet transfers. Keep exchange ownership details, sale confirmation and the withdrawal record.
Also keep the matching credit into your named UK bank account. The clearest route is usually from an exchange account to a personal bank account.
Avoid cash withdrawals and unexplained third-party transfers. They can create extra anti-money-laundering questions.
This works well in theory, but records often cause delays. Missing wallet history can slow underwriting or your solicitor's checks.
Keep exchange and bank statements in their original downloadable format. A large BTC sale before an application is not automatically unacceptable.
Questions & answers
Do I pay tax if BTC funds my deposit?
Yes, selling BTC for pounds normally creates a taxable disposal. This applies even when all proceeds fund a house deposit.
For 2025/26, the first £3,000 of total gains may fall within the annual exempt amount.
How much BTC should I sell for a house deposit?
Sell enough for the deposit, estimated CGT, buying costs and emergency cash. A £35,000 deposit may need far more than £35,000 of sale proceeds.
The extra amount depends on your gain, fees and other purchase costs.
Can a mortgage lender accept Bitcoin sale proceeds?
Many lenders can consider Bitcoin sale proceeds with a clear source-of-funds trail. They may ask for exchange statements, bank statements and wallet history.
They may also request original purchase evidence. The records can cover several years.
Does Bitcoin falling after I sell reduce my CGT?
No, a price fall after a completed sale does not reduce that sale's gain. A later realised loss may have separate CGT treatment.
It does not automatically refund earlier tax.
Can I use a Lifetime ISA with crypto sale money?
Yes, eligible buyers can pay crypto sale cash into a Lifetime ISA. Provider rules and annual contribution limits still apply.
Avoid non-qualifying withdrawals. The withdrawal charge can exceed the government bonus.
The essentials:- Your deposit is the net pounds left after CGT, fees and property costs.
- A Bitcoin sale for a home deposit is usually taxable.
- Buying the home creates no CGT relief.
- Keep an unbroken record from the BTC purchase to your named bank account.
- When a property timeline is live, cash certainty can outweigh uncertain future BTC upside.
