Cash In Hand Work – How Tax Works On It?
Are you thinking of accepting cash in hand work as a payment option? If yes, then you might be wondering about the tax implications.
Being paid cash in hand is not illegal, but the income is taxable and you must declare it to HMRC. If you earn from cash jobs as a self-employed person, you need to register for Self Assessment and report the income unless it falls within the £1,000 trading allowance. Employers who pay staff in cash must still run PAYE and keep records.
This guide explains what cash in hand work means, what you must report, how HMRC finds undeclared income, the penalties, what employers must do and how to put things right if you have not declared. For help, see our self-employed packages or HMRC investigations guide.
Is cash in hand work legal?
Yes. Accepting payment in cash is lawful. What is unlawful is failing to declare the income and pay the tax and National Insurance due on it. The method of payment does not change your tax obligations. A cash payment for a job is treated exactly like a bank transfer: it is income, and it must go on your tax return if it is above the allowance.
Fixed-fee bookkeeping priced by your transactions.
Bookkeeping servicesBook a free callWhat you must declare
| Situation | What to do |
|---|---|
| Self-employed, gross income over £1,000 in the tax year | Register for Self Assessment by 5 October and file a return |
| Gross trading income £1,000 or less | Normally covered by the trading allowance, no tax and no reporting needed |
| Cash work alongside a job | Report the self-employed income on a tax return if over £1,000 |
| Cash paid to you as an employee | Your employer must deduct PAYE and report it. Check your payslips |
| Tips and cash gratuities | Taxable in most cases, and may need reporting depending on how they are paid |
The £1,000 trading allowance covers gross income, not profit, and cannot be used together with claiming expenses on the same income. Read our guide to the trading allowance.
What if you are paid cash as an employee?
If you work for an employer who pays you in cash and does not deduct tax and National Insurance, they are breaking the rules. You may still have to pay tax, and you could lose out on State Pension credits, statutory pay, mortgage eligibility and employment rights. If you are not given a payslip, ask for one. You can report concerns to HMRC and check your National Insurance record online.
How HMRC finds undeclared cash income
- Information from banks, building societies and payment providers.
- Reports from online platforms about sellers’ and gig workers’ earnings.
- Data from other tax authorities and government departments.
- Tip-offs and comparisons with your lifestyle and spending.
- Cross-checks against suppliers’ and customers’ records.
HMRC’s ability to match data has grown steadily, so relying on never being found is a poor strategy. Putting things right voluntarily is usually much cheaper than being investigated.
Penalties and consequences
If you underpay tax because of undeclared income, HMRC can charge the tax, interest and penalties based on your behaviour.
| Behaviour | Maximum penalty |
|---|---|
| Careless | Up to 30% of the extra tax |
| Deliberate | Up to 70% |
| Deliberate and concealed | Up to 100% |
HMRC can usually go back four years for innocent errors, six years for careless errors and up to 20 years for deliberate behaviour. In serious cases there is also a risk of criminal prosecution. Penalties can be reduced significantly if you come forward before HMRC contacts you. See our guide to HMRC investigations.
Employer duties when paying staff in cash
Employers must register for PAYE, deduct income tax and National Insurance, report payments to HMRC on or before each pay day, pay at least the National Minimum Wage and keep payroll records. Paying wages in cash does not remove these duties. Giving workers a payslip is a legal requirement. Failing to operate PAYE properly can lead to penalties, back-payments and compliance checks. See our payroll service.
How to put things right if you have not declared cash income
- Work out what you earned in each tax year, using bank records, diaries and customers’ details.
- Register for Self Assessment if you are not already registered.
- Calculate the tax due on the profit after allowable costs.
- Make a voluntary disclosure to HMRC, ideally with an accountant’s help.
- Pay what you owe, or agree a payment plan if you cannot pay all at once.
- Set up a system to record cash income from now on.
How to handle cash income correctly
- Issue a receipt or invoice for every cash payment and keep a copy.
- Record every payment in a simple spreadsheet or app on the day it is received.
- Pay cash takings into a business bank account regularly.
- Keep receipts for expenses so you can claim them.
- Set aside about 20% to 30% of profit for tax and National Insurance.
Cash in hand work in London
London has many cash-heavy trades, from tradespeople and cleaners to market traders, hospitality staff and drivers. Under HMRC’s focus on the hidden economy, these sectors are regularly checked. Getting your records and tax in order protects you from investigations and helps you get a mortgage or finance, because lenders ask for tax returns. We help sole traders in every borough, from Newham to Barnet. See our self-employed accountants by borough.
Cash in hand work and your future finances
Undeclared income may save tax today but costs you later. Without declared earnings you may struggle to get a mortgage, a business loan or a rental, because lenders and landlords ask for tax returns and bank statements. Declared self-employed earnings also build entitlement to the State Pension through Class 2 and Class 4 National Insurance, and may support claims for some benefits. Over a working life, those protections are worth far more than the tax avoided.
A worked example
A London tradesperson earns £18,000 a year in cash from small jobs and has £3,500 of genuine business costs. His profit is £14,500. After the personal allowance of £12,570, taxable profit is £1,930, so income tax is about £386 and Class 4 National Insurance about £116, a total of around £500. Declaring the income costs him roughly £500 a year, but also gives him proof of income for a mortgage and a clean tax record. Not declaring would risk penalties of up to 30% to 100% of the tax, plus interest, if found.
Simple tools to record cash income
- A notebook or spreadsheet with date, customer, amount and job description.
- An invoicing app that produces a receipt for each payment.
- A separate bank account for business income and costs.
- A photo of every receipt using a receipt capture app.
These habits take minutes each week and make your tax return and any future HMRC question easy to answer.
Frequently asked questions
Do I have to declare cash in hand work?
Yes, if your gross income from it is more than £1,000 in a tax year, you must register for Self Assessment and report it.
Can HMRC find out about cash payments?
Yes. HMRC receives data from banks, platforms and other sources and compares it with returns.
What happens if I did not declare cash income?
You may owe tax, interest and penalties, but coming forward voluntarily usually reduces the penalty.
Is it legal to pay staff in cash?
Yes, but you must still run PAYE, give payslips and pay at least the minimum wage.
Can I get a mortgage if I work for cash?
Lenders usually need tax returns and bank statements, so declared income makes it much easier.
Fixed fees, paid online. Call 020 3441 1258 or get your quote now.
Related guides
Accounting & bookkeepingWhy Small Businesses Need an Accountant in LondonWhy a London small business benefits from an accountant, from deadlines and penalties to tax savings and Making Tax Digital.
Accounting & bookkeepingHow Much Does an Accountant Cost in London? (2026 Guide)What an accountant costs in London in 2026, what drives the price, and how fixed-fee packages compare with hourly rates.
Accounting & bookkeepingHow to Improve Cash Flow in a Small Business: 10 Practical StepsTen practical ways UK small businesses can improve cash flow, from invoicing and forecasting to managing tax payments.