What Is Undeclared Income?
Undeclared income is any money you have earned — or received — that you have not reported to HMRC through a Self Assessment tax return or other official channel. Common examples include:
• Rental income from a property you let out
• Income from self-employment or freelancing
• Earnings from a second job not declared through PAYE
• Cash-in-hand payments for services
• Trading income from online platforms such as eBay, Etsy, or Vinted
• Investment income (dividends, capital gains) not reported
If any of the above applies to you and you live in or around Bristol — including areas like Clifton, Bedminster, Westbury-on-Trym, Almondsbury, Kingswood, or South Gloucestershire — TAKS Limited can help you resolve the situation quickly and professionally.
What Happens If You Don't Declare Your Income?
HMRC has significantly improved its ability to detect undeclared income. It uses data from banks, letting agents, online platforms, Companies House, and the Land Registry to cross-reference against tax returns. If HMRC discovers your undeclared income before you report it yourself, the consequences are considerably more serious:
• Penalties of up to 100% of the unpaid tax (or up to 200% for offshore income)
• Interest on all unpaid tax
• A formal HMRC investigation, which is stressful and time-consuming
• Possible criminal prosecution and, in serious cases, imprisonment
The good news: voluntary disclosure before HMRC contacts you dramatically reduces all of the above. Acting now is almost always better than waiting.
How Far Back Can HMRC Go? (Bristol Taxpayers Should Know This)
HMRC’s time limits for investigating undeclared income depend on your behaviour:
• 4 years — if you acted reasonably (i.e. made an honest mistake)
• 6 years — if you failed to take reasonable care
• 20 years — if HMRC believes you deliberately concealed income
A Real-World Example: Bristol Landlord Disclosure
Your Step-by-Step Action Plan
1. Get professional advice first — call TAKS Limited on 01172565052 before contacting HMRC. We’ll assess how much tax you owe, evaluate the seriousness of your situation, and recommend the best disclosure route.
2. Choose your disclosure method — if you’re a landlord, use HMRC’s Let Property Campaign. If you’re self-employed, the HMRC Digital Disclosure Service. We’ll advise which route minimises your exposure.
3. Gather your records — bank statements, invoices, receipts, rental agreements. Don’t worry if records are incomplete; we work with what’s available.
4. Submit accurate returns — we prepare Self Assessment returns for all relevant years and submit them on your behalf.
5. Negotiate a payment plan — if you cannot pay everything upfront, HMRC will often agree a Time to Pay arrangement. We negotiate this for you.
Why Choose TAKS Limited (Bristol) for Undeclared Income Advice?
• Local Bristol accountants — based at Aztec West, Almondsbury, serving the whole Bristol and South Gloucestershire area
• Specialist tax expertise — we deal with HMRC disclosures regularly and know what they look for
• Authorised to deal with HMRC directly — we communicate with HMRC on your behalf, reducing your stress
• Transparent fees — we discuss costs upfront with no hidden charges
TAKS Limited | 160 Aztec West, Almondsbury, Bristol BS32 4TU | Tel: 01172565052 | info@taks.org.uk
FAQ's
The best first step is to seek professional advice from a qualified accountant or tax adviser before contacting HMRC. They will help you calculate what you owe, choose the right disclosure route, and submit accurate returns on your behalf. Voluntary disclosure — especially before HMRC contacts you — typically results in significantly lower penalties.
In most cases, no — particularly if you make a voluntary disclosure before HMRC investigates you. HMRC primarily seeks financial settlement (unpaid tax + interest + penalties), not prosecution. However, if you have deliberately concealed large amounts of income for many years and HMRC discovers this independently, prosecution is possible. Getting professional advice early greatly reduces this risk.
Penalties depend on your behaviour. For an unprompted voluntary disclosure (you tell HMRC before they suspect you), penalties range from 0–30% of the unpaid tax. If HMRC prompts you first, penalties rise to 15–30%. For deliberate concealment they can reach 100%, or 200% for offshore income. Interest is charged on top of any unpaid tax regardless of the penalty rate.
HMRC can investigate 4 years back for innocent mistakes, 6 years for careless errors, and up to 20 years for deliberate concealment. Once a disclosure is made, HMRC typically requests tax returns and documentation for all relevant years.
Yes. HMRC has a 'Time to Pay' scheme that allows you to pay what you owe in monthly instalments based on what you can afford. An accountant can negotiate this arrangement on your behalf, which is often easier than dealing with HMRC directly.
The Let Property Campaign is HMRC's voluntary disclosure scheme specifically for residential landlords with undeclared rental income. It typically results in lower penalties than a formal investigation. Landlords in Bristol and across the UK can use this scheme to bring their tax affairs up to date.
You are not legally required to use an accountant, but it is strongly recommended. An experienced tax accountant will ensure the disclosure is accurate, choose the right route to minimise penalties, and deal with HMRC on your behalf. Errors in voluntary disclosures can be treated as misleading HMRC, which increases penalties.
Yes. TAKS Limited, our Bristol-based accountancy firm, is authorised to deal with HMRC directly on your behalf under a 64-8 Agent Authorisation form. This means HMRC will contact us, not you, throughout the process.