Paying a roofer in cash is lawful, and no UK law caps how much of it you may hand over. The useful question is not whether cash is allowed but what you give up by using it.
There is no UK cash limit
France, Italy and Spain cap consumer cash payments. The UK does not. The only cash threshold in UK law is a duty on the trader rather than a ceiling on you: a business accepting cash of €10,000 or more in exchange for goods is a high value dealer and must register with HMRC for money laundering supervision first. That obligation belongs to the business, and the customer commits no offence at any amount.
The "£10,000 UK cash limit" that circulates online does not exist. Nor is a trader obliged to accept cash, because legal tender rules do not force anyone to take notes.
A cash discount is lawful. "No invoice" is not
HMRC's own valuation manual says discounts may be offered when payment is made wholly in cash, and that VAT is then due on the lower sum, because the consideration is only the money actually paid. A roofer knocking something off for cash is doing nothing wrong, and neither are you.
What changes the picture is the paperwork. HMRC defines fraud as any deliberate omission, concealment or misrepresentation of information to gain a tax advantage, with civil penalties reaching 200% of the tax due in some cases. A lower price with a proper invoice is a discount. The same price offered on the express basis that there will be no invoice and no VAT is an offer to evade tax, and that is a different transaction.
The tell is never the discount. It is what the roofer says about the record.
There is also an innocent explanation that should lead. The VAT registration threshold is £90,000 of taxable turnover, so a genuinely small sole trader lawfully charges no VAT at all. A roofer who is not registered has no VAT to drop, which makes "cash, no VAT" a meaningless offer rather than a sinister one. A registered firm cannot switch VAT off for cash whatever the payment method.
You are not ordinarily liable for the roofer's tax
Most pages on this subject imply the homeowner is running a legal risk. Ordinarily they are not. The duty to declare income and account for VAT is the trader's, and a homeowner who pays cash and takes a receipt has done nothing wrong.
The offence most often cited against customers cannot apply to one. Section 45 of the Criminal Finances Act 2017 catches a "relevant body", which section 44 defines as a body corporate or partnership. A private individual is neither, and cannot commit it.
What could put a customer on the wrong side of the line is agreement rather than payment. Dishonestly agreeing with a trader to defraud the revenue, by accepting a lower price on the express understanding that it will not be declared, is conspiracy territory, and the bar there is dishonesty plus agreement, not handing over notes. Asking for a receipt is the one step that keeps the transaction plainly ordinary.
Cash costs you enforcement, not rights
Your rights under the Consumer Rights Act 2015 do not depend on how you paid. The roofer still owes you reasonable care and skill whether the money moved by card, transfer or envelope. What cash removes is the machinery for enforcing those rights.
- No proof of payment. This is the practical killer in a small claims hearing.
- No Section 75. The Financial Ombudsman is explicit that it does not apply to cash.
- No chargeback. That needs a card payment to reverse.
- Guarantees become hard to claim on. Most require proof of purchase and date.
- A trader who is harder to find. The NFRC's own homeowner guidance notes that contractors offering cash or VAT-free deals are not easily tracked down when something goes wrong.
- Insurance and conveyancing friction. Undocumented work complicates claims and resurfaces when you sell.
Citizens Advice is blunt about it: avoid traders who only accept cash or want everything upfront, and pay by debit or credit card if you can.
The deposit is the payment never to make in cash
If any part of the job is going on plastic, make it the money that leaves before the work does. Where the cash price of the work is more than £100 and no more than £30,000, putting any part of it on a credit card makes the card issuer jointly liable with the roofer for the whole cash price, even if the firm stops trading before the scaffold comes down. It is the price of the job that has to clear £100, not the amount you put on the card. The same deposit in cash protects nothing at all.
Cash suits a settled invoice, not money paid in advance.