Voluntary correction, historic calculations, penalties, interest and formal offers
Tax Disclosure to HMRC for Undeclared Income, Gains and Tax Errors
A tax disclosure to HMRC should use the correct facility, include the correct years and calculate the tax, interest and penalty from supportable records before a formal offer is made. We prepare voluntary disclosures for undeclared business income, rental profit, foreign income, investments, cryptoassets, Capital Gains Tax, company liabilities and other historic errors for clients across Exeter and the surrounding Devon districts.
Direct answer
When a Tax Disclosure to HMRC Is Required
A disclosure should be considered when an earlier return, claim, registration or tax payment omitted taxable income, gains, transactions or liabilities. Common examples include undeclared trading income, rental profit, foreign investments, cryptoasset disposals, company income, director loans, VAT errors and failure to register for a tax.
The correction route depends on whether the return can still be amended, whether HMRC has already made contact, whether the matter is onshore or offshore, whether a campaign applies and whether the conduct may have been deliberate. Selecting the wrong route can leave liabilities outside the disclosure.
A voluntary tax disclosure may preserve unprompted treatment
The timing should be recorded before any notification because an HMRC letter or imminent discovery can change the penalty classification.
A disclosure can still be made, but may be prompted
The response route should coordinate with the letter or compliance check rather than create inconsistent parallel submissions.
The CDF position must be reviewed before using an ordinary facility
HMRC identifies the Contractual Disclosure Facility as the specialist route carrying its contractual assurance for fully disclosed deliberate conduct.
The route is chosen before notification
Which HMRC Tax Disclosure Route Applies?
HMRC does not operate one universal disclosure form. The current and historic filing position, source of the tax, taxpayer type and behaviour determine which service or statutory correction process is appropriate.
Amend the Return Within the Statutory Window
A recent Self Assessment or Company Tax Return may still be amendable. The amended return, computation and payment should be completed rather than duplicating the same year in an ordinary disclosure.
Digital Disclosure Service
The DDS can cover Income Tax, Capital Gains Tax, Inheritance Tax, Corporation Tax, National Insurance and ATED for individuals, companies, trusts, estates and other eligible taxpayers.
Worldwide Disclosure Facility
The WDF is used where unpaid UK tax relates wholly or partly to foreign income, gains, assets, activities or funds transferred outside the UK.
Let Property Campaign
Individual landlords can disclose undeclared residential rental income from UK or overseas property, including their own share of jointly owned income.
Unpaid Cryptoasset Tax Service
HMRC provides a dedicated route for historic Income Tax or Capital Gains Tax involving exchange tokens, NFTs and utility tokens.
R&D Relief Claimed in Error
Where it is too late to amend the Company Tax Return, HMRC provides a dedicated service for disclosing Research and Development relief claimed in error.
VAT Error Correction Notification
VAT is not disclosed through the DDS. The correction may belong on a later VAT Return or require separate online or written notification, depending on amount and behaviour.
Till-System Misuse Disclosure
HMRC operates a dedicated form for businesses that used till systems to reduce recorded sales or tax, including cases where HMRC has already issued a relevant letter.
PAYE and National Insurance Disclosure
Salary, benefits, expenses, worker status and payroll failures may require direct employer disclosure and corrected RTI records rather than inclusion only in a personal DDS calculation.
Historic Corporation Tax and Director Transactions
Earlier company income, deductions, gains, R&D, loans to participators and associated filings are reviewed together with whether accounts and CT600 returns can still be amended.
Inheritance Tax, Trust and Estate Disclosure
Property, lifetime gifts, estate values, trust income, gains and beneficiary payments can involve different return, interest and time-limit rules.
Contractual Disclosure Facility
The CDF is the route HMRC identifies where a person wants to disclose deliberate behaviour and obtain the contractual assurance available for complete and accurate disclosure of that conduct.
A disclosure is a calculation and formal offer
The Voluntary Tax Disclosure Process
Notification does not settle the liability. The affected years, tax, interest and penalties must be calculated and supported before the disclosure and offer are submitted.
Identify the correct facility before notifying HMRC
Confirm the taxpayer, taxes, source, HMRC contact, behaviour risk, record position and likely years.
Register the intention to disclose where required
Obtain the disclosure and payment references and record the HMRC acknowledgement date and deadline.
Rebuild each affected tax year or accounting period
Calculate gross income, gains, allowable costs, losses, tax credits, payments and corrected liabilities.
Establish time limits and the penalty framework
Document reasonable care, carelessness, deliberate conduct, prompted status and disclosure quality.
Prepare the disclosure, explanation and formal offer
Include tax, National Insurance where relevant, interest, penalties and the factual explanation.
Submit, pay and restore ongoing compliance
Address payment before submission, correct current returns and respond to any HMRC clarification request.
Common direct-tax disclosure periods
How Many Years Must Be Included?
The number of years is not chosen by convenience or record availability. It depends on the tax obligation, whether a return or registration was made, the behaviour that caused the loss and whether an offshore matter or transfer significantly affected HMRC's ability to identify it.
Common maximum of four years
Can apply where the taxpayer registered as required and the error arose despite taking reasonable care.
Common maximum of six years
Can apply where the taxpayer registered but a failure to take reasonable care caused insufficient tax to be paid.
Common maximum of 12 years
Can apply to specified Income Tax, Capital Gains Tax and Inheritance Tax offshore matters or transfers.
Up to 20 years in common cases
Deliberate conduct and specified failures to register or notify can expose substantially earlier periods.
The disclosure must reconstruct the correct tax position
Calculating Undeclared Income, Gains and Tax
A disclosure is prepared year by year because tax rates, allowances, losses, ownership, foreign-tax credits and payment dates change. Gross bank deposits or total sale proceeds are not automatically taxable profit.
Identify the gross source for each year
Business receipts, rent, interest, dividends, pensions, employment, trust income and other taxable amounts.
Apply the deduction rules for the source
Business, property and investment costs require source-specific tests and supporting evidence.
Allocate income and gains to the correct taxpayer
Joint property, partnerships, trusts, companies and nominee accounts can require separate disclosures.
Calculate proceeds, base cost and reliefs in sterling
Property, shares, funds, cryptoassets and business disposals require transaction histories and loss review.
Check whether historic losses are available
Trading, property and capital losses have separate claim, carry-forward and time-limit rules.
Credit only admissible tax paid on the same source
Treaty limits, refunds, legal taxpayer and UK tax attributable to the item affect Foreign Tax Credit Relief.
Reconcile PAYE, withholding, CIS and payments on account
Credits are matched to the correct person, year and liability before calculating additional tax.
Calculate from the original payment date
HMRC interest rates change over time, so each liability is calculated across the relevant rate periods.
Apply the regime to the potential lost revenue
Inaccuracy, failure to notify, late filing and offshore penalties may apply to different parts of one disclosure.
Missing records do not remove the obligation to disclose
Reconstructing Historic Tax Where Records Are Incomplete
Old disclosures often involve closed accounts, unavailable invoices, overseas records or platform data that was not retained. The reconstruction should use independent evidence and explain its limitations.
Trace receipts, transfers and non-taxable deposits
Business and relevant personal accounts, card processors, booking systems and payment platforms can help rebuild turnover without treating every credit as taxable income.
Obtain replacements from agents, tenants, brokers and employers
Letting statements, broker histories, foreign tax certificates, pension statements and payroll records can replace missing internal documents.
Establish who owned the asset and when each event occurred
Legal title, beneficial ownership, partnership rights, trust interests and transaction dates determine which taxpayer and year are affected.
Use a transparent method where exact figures cannot be recovered
Sampling, known occupancy, contract rates, platform exports or other evidence can support an estimate if assumptions and uncertainty are explained.
Compare records with filed returns and known lifestyle facts
Tax returns, accounts, mortgage applications, Companies House filings and asset purchases can identify omissions or inconsistencies requiring explanation.
Retain the reconstruction file supplied to HMRC
Source records, calculation versions, exchange rates, assumptions and final year schedules should remain available if HMRC asks how the disclosure was prepared.
Penalty analysis begins with the reason for the tax loss
Unprompted Disclosure, Behaviour and Penalty Reductions
Penalties are not chosen to make the disclosure affordable. The correct regime, potential lost revenue, prompted status, behaviour and quality of disclosure determine the percentage.
No inaccuracy penalty, although tax and interest remain payable.
No inaccuracy penalty where reasonable care is established.
Standard onshore range: 0% to 30% of potential lost revenue.
Standard onshore range: 15% to 30% of potential lost revenue.
Standard onshore range: 20% to 70% of potential lost revenue.
Standard onshore range: 35% to 70% of potential lost revenue.
Standard onshore range: 30% to 100% of potential lost revenue.
Standard onshore range: 50% to 100% of potential lost revenue.
The timing is tested when the disclosure is made
The taxpayer must have no reason to believe HMRC has discovered or is about to discover the particular inaccuracy or failure.
Knowledge, systems, advice and review steps are evidenced
The conclusion should address what the taxpayer understood, the complexity involved and what was done to check the filing.
Telling, helping and giving access affect the reduction
A complete explanation, active assistance and accessible records can move the penalty toward the statutory minimum for the established category.
Standard onshore ranges do not cover every liability
Offshore, failure-to-notify, late-filing, VAT and other penalties can have different ranges and conditions.
Facility deadlines and payment rules differ
Notification, Submission and Payment Deadlines
A notification creates a fixed work period. It should not be submitted merely to show intention where the records cannot be gathered and the calculations cannot reasonably be completed by the facility deadline.
Disclosure within 90 days of HMRC's acknowledgement
HMRC issues a Disclosure Reference Number and Payment Reference Number. The disclosure, formal offer and payment or agreed arrangement must be completed by the stated deadline.
Offshore disclosure within the same 90-day framework
The calculation includes all previously undisclosed UK tax liabilities within scope, not only the first foreign account or income source identified.
Landlord notification is followed by a 90-day calculation period
Each individual owner submits a separate disclosure and payment for their own share of undeclared rental profit and related liabilities.
Payment is normally due within 30 days after disclosure
HMRC sends a payment reference after receiving the disclosure. The full amount or payment discussion is then addressed within the stated period.
Source-specific disclosure calculations
Common Tax Disclosure Work
The disclosure route may be common, but the tax calculation depends on the source. Each category below requires different evidence, deductions and year-by-year treatment.
Undeclared Trading and Side Income
Turnover, cash receipts, platform income, allowable expenses, capital allowances, losses, Class 2 history and Class 4 National Insurance are reconstructed.
Rental Income and Joint Ownership
Gross rent, agent statements, expenses, finance-cost treatment, losses, ownership changes and each landlord's personal share are calculated.
Overseas Accounts, Property, Pensions and Investments
Residence, source, sterling conversion, foreign tax, treaty limits and available credit relief are reviewed before using the WDF.
Property, Shares, Funds and Business Assets
Disposal proceeds, base cost, transaction fees, losses, reliefs, ownership and any separate property reporting obligations are reconciled.
Disposals, Income Events and Pooling
Exchange histories, wallets, transfers, fees, staking, employment rewards and sterling values are rebuilt without treating internal wallet transfers as disposals.
Omitted Turnover, Expenses, Gains and Director Loans
Accounts, CT600 computations, Companies House filings, VAT, payroll, benefits and director personal tax are reviewed for connected consequences.
Output Tax, Input Tax and Registration Failures
Taxable turnover, rate, tax point, input evidence and error-correction limits determine whether the return is adjusted or HMRC is notified separately.
Inheritance Tax, Administration Income and Distributions
Ownership, valuations, gifts, reliefs, income, gains and beneficiary payments may involve more than one return and taxpayer.
Agreed Exeter guide fees
Tax Disclosure, WDF and Let Property Campaign Fees
These are the previously agreed fees. The fee is based on the affected years, source records and defined disclosure route. Current returns, complex Capital Gains Tax calculations, entity restructuring, COP9 and HMRC enquiries are separately scoped where required.
General Digital Disclosure Service work
Historic onshore tax calculations, interest and penalty analysis, disclosure explanation and formal offer.
Worldwide Disclosure Facility
Historic offshore calculations, Foreign Tax Credit Relief review, interest, penalties and formal disclosure.
Let Property Campaign
Rental-profit reconstruction, finance-cost treatment, losses, interest, penalties and landlord disclosure.
Tax-disclosure consultation
A scheduled review of the error, likely route, years, records, HMRC contact and immediate actions.
Cryptoasset, VAT, employer or R&D disclosure
The fee depends on transaction volume, records, taxes, years, software data and correction route.
Contractual Disclosure Facility or existing HMRC investigation
Deliberate-conduct review, COP9 coordination and any separate legal advice are scoped immediately from the known facts.
Documents requested securely after engagement
Information Needed for a Complete Tax Disclosure
The initial enquiry requires only a summary. Once the route and scope are agreed, records are collected by taxpayer, source and year so that the disclosure can be reproduced if HMRC asks for clarification.
Existing tax filings
- Returns and amendments for affected years
- Accounts and tax computations
- Payments on account and tax credits
- Earlier disclosures or HMRC settlements
Income and business records
- Invoices, ledgers and platform reports
- Bank and card statements
- Expense evidence and capital purchases
- Payroll, VAT and CIS records
Property and capital gains
- Ownership and completion documents
- Rental statements and expense records
- Purchase, improvement and sale costs
- Valuations and earlier loss schedules
Foreign and investment records
- Foreign tax returns and certificates
- Bank, broker and pension statements
- Travel and residence information
- Transfers, exchange rates and treaty claims
Behaviour and chronology
- How and when the error was discovered
- Advice obtained and information supplied
- Who prepared and approved the filing
- HMRC letters or third-party data notices
Missing records and payment
- Records unavailable and the reason
- Alternative evidence and estimation method
- Current ability to pay the liability
- Assets, debts and cash-flow information if required
Disclosure preparation and completion
From Historic Records to HMRC Acceptance
The work is sequenced so that notification deadlines are protected without submitting an incomplete calculation or behaviour explanation.
Route, HMRC contact and deadline reviewed
We identify the facility, taxpayers, taxes, likely years, CDF risk and records required.
Income, gains and liabilities calculated
Each year is rebuilt using source records, deductions, tax rates, credits and supportable estimates.
Interest, penalties and formal offer prepared
The explanation addresses behaviour, time limits, prompted status and how the figures were derived.
Submission, payment and future filings resolved
The disclosure is submitted, payment is addressed and HMRC clarification is managed through acceptance.
Exeter and surrounding Devon
Tax Disclosure Work Reflecting Regional Income and Assets
The wider Exeter economy combines professional, healthcare, university and technology activity with property, tourism, construction, manufacturing, rural businesses and internationally connected private clients. Historic omissions therefore arise from different records and tax sources.
Professional, academic, healthcare and technology income
Consultancy, overseas duties, research income, company extraction, investments, cryptoassets and several employments.
Rental property, tourism and private wealth
Residential rent, former holiday letting, foreign property, pensions, investments, estates and family ownership.
Trades, manufacturing, construction and rural businesses
Cash and platform income, CIS, plant, land, diversification, family partnerships and company transactions.
Hospitality, property and owner-managed enterprises
Seasonal turnover, booking platforms, tips, VAT, property gains, subcontractors and director accounts.
Common practical and technical questions
Tax Disclosure to HMRC FAQs
What is a voluntary tax disclosure to HMRC?
A voluntary tax disclosure tells HMRC about tax that was not correctly reported or paid for an earlier period. It normally identifies the taxpayer, tax, affected years, omitted income or gains, allowable deductions, tax, interest, penalties and the reason for the error. The correct route may be an amended return, the Digital Disclosure Service, the Worldwide Disclosure Facility, the Let Property Campaign or another specialist HMRC process.
Should HMRC be notified before the tax calculation is complete?
The answer depends on the disclosure route. The Digital Disclosure Service, Worldwide Disclosure Facility and Let Property Campaign begin with a notification and normally allow 90 days after HMRC acknowledges that notification to complete the disclosure. Before notifying, the route, likely years, record availability and ability to meet the deadline should be reviewed.
What is the difference between an unprompted and prompted disclosure?
A disclosure is unprompted where the taxpayer has no reason to believe HMRC has discovered or is about to discover the issue. Otherwise it is prompted. An HMRC letter, nudge letter, compliance check or information request can affect the classification. A disclosure made during a check is usually prompted, although an unrelated issue outside the scope of the check may require separate analysis.
How many years must be included in a tax disclosure?
The period depends on the tax, filing history and behaviour. Common direct-tax periods are up to four years where reasonable care was taken, six years for careless inaccuracies, 12 years for specified offshore matters and 20 years for deliberate conduct or certain failures to notify. These are not universal limits, so the legislation and facts must be checked before excluding an earlier year.
Can the Digital Disclosure Service be used for VAT errors?
No. VAT errors use the VAT correction rules. Smaller qualifying net errors may be adjusted on a later VAT Return, while larger errors and deliberate inaccuracies require separate notification to HMRC. The relevant VAT periods, output tax, input tax, interest and penalty position should be calculated separately from an Income Tax or Corporation Tax disclosure.
When should the Worldwide Disclosure Facility be used?
The Worldwide Disclosure Facility is used where a UK tax liability relates wholly or partly to an offshore issue. This can include foreign income, gains, assets, activities or funds connected with unpaid tax that were transferred abroad. Onshore and offshore liabilities can be included together where the facility and disclosure form permit.
Who can use the Let Property Campaign?
The Let Property Campaign is intended for individual landlords with undeclared tax from letting residential property in the UK or abroad. Each owner makes a separate disclosure for their own share. Company landlords, commercial property, property development and liabilities involving more than rental income may require a different route.
Is there a separate HMRC disclosure service for cryptoassets?
Yes. HMRC provides a dedicated service for unpaid tax on cryptoasset income and gains, including exchange tokens, NFTs and utility tokens. Current or recent reportable amounts may instead belong on a Self Assessment return or amendment. Historic transactions require complete acquisition, disposal, pooling, income and sterling-conversion records.
What happens if the tax error was deliberate?
Deliberate behaviour requires immediate specialist review. HMRC states that the Contractual Disclosure Facility is the route for a person who wants to disclose deliberate behaviour that caused a loss of tax and obtain the contractual assurance available for fully disclosed deliberate conduct. A routine DDS notification should not be made before the CDF position is considered.
Must the full disclosure amount be paid when the disclosure is submitted?
Under the Digital Disclosure Service, Worldwide Disclosure Facility and Let Property Campaign, the disclosure normally includes a formal offer and payment of tax, interest and penalties by the stated deadline. Where full payment cannot be made, HMRC should be contacted and an arrangement considered before the disclosure is submitted.
Can estimates be used where old records are missing?
A disclosure should use the best evidence reasonably available. Where records are genuinely incomplete, HMRC guidance allows supportable estimates, but the reconstruction method, assumptions, source evidence and limitations must be retained and explained. An unsupported round-sum estimate is unlikely to show that the disclosure is complete.
What happens after HMRC receives a disclosure?
HMRC reviews whether the disclosure appears complete, the tax and interest are correct, the behaviour and penalty are reasonable and payment has been addressed. HMRC may accept the offer, ask for evidence or clarification, reject it or open a compliance check. Current and future returns must also be corrected so the same omission does not continue.
Start with what was omitted and whether HMRC has contacted you
Tell Us the Income, Tax Years and Available Records
A short summary is enough for the initial review. We will confirm the correct disclosure route, immediate deadline, records required and agreed fee before notification or substantive calculations begin.