How to Record Cash Sales as a UK Sole Trader

Record every cash payment the day you receive it: the date, the amount, who paid, what for, and a copy of the invoice or receipt you gave them. Then pay it into your business account and make sure the deposit matches the entry. That one habit protects you at Self Assessment, with your bank and in any HMRC enquiry.

Cash is still normal on small jobs, and nothing in UK law stops you taking it. The risk is not the cash. It is the cash you cannot account for later.

TL;DR

• Cash income is taxable income. HMRC expects records of all business income and expenses, whatever the payment method.
• Under cash basis you record income on the day you actually receive it, not when you send the invoice.
• Give a receipt or paid invoice for every cash job, and log it the same day, not at the weekend.
• Pay cash into your business account and keep deposits in line with your normal trading pattern.
• Keep records for at least five years after the 31 January deadline for that tax year.

Table of Contents

• What the rules say about cash sales
• When a cash sale counts as income
• A simple routine for recording cash on the job
• Paper, spreadsheet or app?
• Can you take as much cash as you like?
• Banking cash: what looks normal to HMRC and your bank
• How long to keep your cash records
• Common cash recording mistakes
• Our view: cash is fine, memory is the weak point
• Recording cash sales in TradeTally
• FAQ
• Sources

What the rules say about cash sales

There is no special rulebook for cash. The general duty applies: under Self Assessment you must keep the records needed to make a correct and complete tax return. For a business, that means your sales and your expenses.

Business.gov.uk lists what counts as records of sales and other business income: invoices, till rolls and bank slips. For a tradesperson, that usually means:

• A copy of each invoice, marked paid, with the date and method of payment.
• A receipt book or digital receipt for smaller jobs and call-outs.
• Your bank paying-in slips or statements showing where the cash went.
• A running log of all income, in date order.

HMRC treats this as a legal duty, not a nicety. Its own manual explains that the requirement exists so people cannot under-report in the hope that HMRC relies on low estimates. Careless record-keeping can lead to penalties.

When a cash sale counts as income

Most sole traders now use cash basis by default. Under it, you record income when you receive it and expenses when you pay them. The alternative is traditional (accruals) accounting, where you count income when you earn it.

For cash jobs this makes life easier. The customer hands you £180 on Tuesday: Tuesday is the date in your records. If you issue an invoice on Friday and the customer pays two weeks later, you log it on the day the money arrives. Do not record unpaid invoices as income.

Cash basis can be a poor fit if you carry a lot of stock or have long, high-value contracts. If that sounds like you, speak to an accountant before choosing. Our guide to cash basis accounting for UK trades explains how it affects the gap between earning money and paying tax on it.

A simple routine for recording cash on the job

The jobs that cause trouble are small, quick, paid in notes on the doorstep and forgotten by Friday. A routine fixes that.

1. Write or issue the receipt before you leave. Date, customer name, address or job reference, work done, amount, and “paid in cash”. Keep a copy.
2. Log it the same day. Put it in your records before you drive off or at the latest that evening. Memory of a £60 call-out fades quickly.
3. Keep the cash separate. Do not mix it with your own money or spend it on materials before it is recorded. If you do pay for something from takings, record both the income and the expense.
4. Pay it in regularly. Bank cash in the business account and note the date and total against the jobs it covers.
5. Reconcile weekly. Compare your log with your bank statement. Every deposit should map to recorded sales, and every recorded cash sale should end up banked or accounted for.

Pro tip: if you pay a labourer or buy a part from takings, write it down as a separate expense with a receipt. Otherwise your records show less cash than you took, and the gap looks like a mistake or worse.

What to put in each entry

The “banked on” column is what makes your audit trail hold together.

Paper, spreadsheet or app?

Any of the three is acceptable for now, as long as the records are accurate, legible and complete. They differ in how much effort they take and how well they cope with change.

The digital route matters more as Making Tax Digital for Income Tax rolls out. It became mandatory from 6 April 2026 for sole traders with qualifying income over £50,000, and requires compatible software for digital records and quarterly updates. The threshold is due to fall in later years, so check what applies to your income now rather than when a letter arrives.

Can you take as much cash as you like?

For most trades, yes. There is no general legal cap on cash payments to a plumber, electrician or builder. The exception is the high value dealer rule: a business that accepts cash payments of 10,000 euros or more for goods may have to register with HMRC for money laundering supervision. That is aimed at businesses dealing in goods, so a tradesperson selling labour and fitting materials is rarely affected. If you regularly sell materials or equipment for large cash sums, check the guidance or ask an accountant.

The businesses that are covered have to carry out a risk assessment under the Money Laundering Regulations. The same guidance is useful reading for anyone, because it shows what looks suspicious: cash that does not fit the business.

Banking cash: what looks normal to HMRC and your bank

HMRC does not get an automatic alert for every cash deposit. It does have legal powers to ask banks for account records, and it can use them during a compliance check.

What draws attention is a pattern that does not fit. HMRC’s own guidance frames risk around what is normal for your particular business: unexpected, large or frequent deposits that depart from your usual trading profile. Its guidance for high value dealers also flags deposits split across branches on the same day, or kept just under a threshold.

Practical ways to stay on the right side of that:

• Bank cash in regular, ordinary amounts rather than saving it for one big deposit.
• Never split deposits to stay under a number.
• Keep a paying-in note linking each deposit to the jobs it covers.
• If a customer pays an unusually large sum in cash, get a signed receipt and keep a copy of the quote or contract.
• Do not pay business takings into a personal account and sort it out later. That muddies the trail.

If your records show where each pound came from, an unusual deposit is just a line you can explain.

How long to keep your cash records

The usual rule for Self Assessment is five years after the 31 January submission deadline for the relevant tax year. Gorilla Accountants gives the same rule of thumb for sole traders. HMRC sets different periods for some documents, and its manuals set out minimum retention periods for different manual records, so when in doubt, keep everything for the full period.

The date that matters is the filing deadline, not the day of the job. A cash sale from May 2026 sits in the 2026/27 tax year, so it needs to be kept well into the 2030s. Our Self Assessment records checklist covers what to store and how, and the guide to the five year rule on site shows how to capture it without a filing cabinet.

GOV.UK also reminds self-employed people to choose the dates their records run from and to, ideally matching the tax year from 6 April to 5 April, which makes the return simpler.

Common cash recording mistakes

• Rounding and “roughly” entries. Record the actual figure, not a guess at the end of the month.
• Skipping small jobs. Ten unrecorded £50 jobs is £500 of missing income.
• Mixing personal and business spending. It makes both sets of records unreliable. See how to split personal and business expenses.
• Recording the invoice date instead of the payment date when you are on cash basis.
• No tax set aside. Cash feels like spending money. Put a share aside straight away. Our cash flow guide works through a tax pot and a 13 week forecast.
• Losing the expense side. Income is only half the profit figure. Keep receipts for materials and fuel too, using the expense tracking guide.

Our view: cash is fine, memory is the weak point

We built TradeTally because the paperwork after a day on site is where things slip. Most of the cash problems we hear about are not dishonesty. They are a tired person, a van full of loose receipts and a notebook that did not get written up on Thursday.

Our advice is plain. Take the cash if the customer wants to pay that way, but make the record faster than the payment. If recording a £60 job takes two minutes at a desk on Sunday night, it will be skipped. If it takes thirty seconds in the van before you start the engine, it will happen. That is why we designed invoicing and receipt capture around the phone.

The second point is about trust. A clean record is not just for HMRC. It settles arguments with customers (“I paid you last week”), shows your bank where money came from, and gives your accountant something they can use. Think of it as cheap insurance against a dispute.

— Simon

Recording cash sales in TradeTally

If you want the routine above without the notebook, TradeTally lets you create a branded invoice from your phone, snap receipts, and keep tax-ready records for Self Assessment, including an SA103F export. You can mark a job as paid by cash when the customer pays, so your income sits on the day you actually received it.

The Starter plan is £0 per month and covers limited invoicing. Professional is £12 per month or £120 per year for unlimited invoices, receipts and tax exports. See the plans and pricing, or start on the TradeTally home page. If your income is heading towards the Making Tax Digital thresholds, look at our MTD software for sole traders.

FAQ

How do you record cash sales in accounting?

Record each sale on the date you receive the money, with the customer, the amount, what it was for and a reference to your receipt or invoice. Under cash basis, the receipt date is what counts. When you bank the cash, note the deposit against those sales so your records and statements agree.

Is there a limit on cash transactions in the UK?

There is no general legal limit for ordinary tradespeople. Businesses that accept 10,000 euros or more in cash for goods may need to register with HMRC as a high value dealer. Businesses can also choose to refuse cash, as the FCA has made clear that its powers do not cover that choice.

Do banks notify HMRC of large cash deposits?

Not automatically for every deposit. HMRC can, however, request information from banks during a compliance check. Deposits that do not match your normal trading are what attract attention, so keep records that explain them.

Where are cash sales recorded?

In your sales or income record, whether that is a ledger, a spreadsheet or accounting software. Each entry should link to a receipt or invoice, and the totals feed into your Self Assessment return. If you use an app, the same entry can also support your SA103F figures.

Do I need to record cash sales if the customer does not want a receipt?

Yes. Your duty to record income does not depend on whether the customer asks for paperwork. Make your own record at the time, and keep a copy of the receipt or note you would have issued.

Sources

• Cash basis: how to record income and expenses, GOV.UK
• SALF211, requirement to keep records, HMRC internal manual
• Setting up business accounting and finance, Business.gov.uk
• HS222 How to calculate your taxable profits (2026), GOV.UK
• Making Tax Digital for Income Tax, GOV.UK
• High value dealer registration, GOV.UK
• Risks common to all high value dealers, GOV.UK
• CH227220, HMRC compliance handbook
• ECSH33339, unusually large and complex transactions, HMRC internal manual
• CH15400, record retention periods, HMRC internal manual
• Business records if you’re self-employed, GOV.UK
• FCA statement on access to cash powers
• What records should a sole trader keep for HMRC?, Gorilla Accountants

Recommended

• Avoid March to April Tax Shocks: Cash Basis Accounting for UK Trades
• Store Records 5 Years: Self Assessment Checklist for UK Sole Traders
• Expense Tracking Guide UK for Sole Traders
• Sole trader cash flow: 13 week forecast and 25 to 30% tax pot