CITN Test of Professional Competence (TPC) key terms

The system under which a taxpayer calculates and reports their own taxable income and tax liability on a return, taking legal responsibility for the figures submitted, rather than the tax authority issuing an assessment first.

The statutory date by which a return must be submitted for a given period; missing it normally triggers automatic penalties and can extend the authority's window for opening an enquiry into that return.

A formal examination by the tax authority of a taxpayer's return, records and affairs to verify the figures declared; the scope and time limits are set by statute and the taxpayer has defined rights of representation.

A written statutory request requiring a taxpayer or third party to provide documents or information relevant to a tax matter; failure to comply without reasonable excuse can attract penalties or enforcement action.

The structured set of civil sanctions imposed for late filing, late payment, inaccuracy or non-compliance, usually graduated by behaviour and severity, and often mitigated by disclosure and cooperation with the authority.

A defence to certain penalties where the taxpayer can show a genuine explanation for non-compliance despite taking reasonable care, such as serious illness, bereavement or reliance on incorrect official advice.

The standard of diligence expected of a taxpayer when preparing returns and supplying information; failing it can lead to penalties for careless inaccuracy, while meeting it generally protects against such sanctions.

Conduct in which the taxpayer knowingly supplies false information or suppresses relevant facts; it attracts the highest civil penalties and may also expose the taxpayer or adviser to criminal investigation.

An advance payment of tax made before the final liability is settled, typically required at fixed intervals during the year, with the balance or repayment determined once the return is filed.

Statutory interest charged on tax paid after its due date, calculated daily from the due date to the date of payment; it is separate from, and additional to, any late-payment penalty.

The statutory duty to retain adequate books, invoices and supporting documents for a specified period after the relevant tax year, so that the figures on a return can be substantiated if challenged.

The authority's statutory powers to collect unpaid tax, including demands, enforcement action, deductions from income and, in serious cases, insolvency or court proceedings.

A negotiated instalment plan allowing a taxpayer in temporary financial difficulty to settle a tax debt over time, usually on condition that current liabilities are met and the terms are kept.

A taxpayer's unprompted correction of an error or omission in a return before the authority discovers it; the disclosure typically reduces penalties and can help avoid criminal prosecution.

Arranging affairs to reduce tax in a way that exploits the letter of the law contrary to its purpose; it may be countered by specific anti-avoidance rules or a general anti-abuse rule.

The illegal reduction of tax through deliberate concealment, false statements or non-disclosure; it is a criminal offence and also triggers civil penalties and possible money laundering reporting.

A statutory provision allowing the tax authority to disregard or recharacterise arrangements whose main purpose is to obtain a tax advantage that the legislation did not intend.

The principle that the tax treatment of a transaction follows its economic and legal reality rather than the label the parties have attached to it.

Reading tax legislation in light of the purpose Parliament intended, rather than applying a literal reading of the words in isolation; central to modern judicial reasoning on avoidance schemes.

The statutory test determining which country has primary taxing rights over a person's worldwide income, commonly based on days present, habitual abode, family ties or domicile.

A legal concept linking a person to a jurisdiction they regard as their permanent home; it can expose a person to tax on worldwide income and to inheritance or transfer taxes even when resident elsewhere.

A fixed place of business, or a dependent agent, through which a business carries on activity in another country, giving that country the right to tax the resulting business profits.

A bilateral agreement allocating taxing rights between two countries, setting rules for residence and source taxation, and providing relief such as credit or exemption to prevent the same income being taxed twice.

The setting of prices for transactions between related parties; tax rules require these to be at arm's length, meaning what independent parties would have agreed in comparable circumstances.

The distinction between expenditure or receipts that are capital in nature (affecting the asset base) and those that are revenue (recurring trading items), which determines deductibility and the applicable tax regime.

Statutory deductions that spread the cost of qualifying capital assets, such as plant and machinery, against taxable profits over time in place of a single immediate deduction.

An accounting approach recognising income and expenses when they are earned or incurred rather than when cash changes hands; tax rules may follow or modify it.

Goods held for sale or consumption in the ordinary course of business; its valuation at period end directly affects reported profit and is subject to specific tax rules.

The moment at which a taxable event is treated as occurring for a transaction tax such as VAT, fixing the period in which the tax must be accounted for and paid.

Output tax is charged on a business's taxable sales; input tax is charged on its purchases. A registered business generally offsets input against output and pays the net difference to the authority.

The rule determining which jurisdiction's transaction tax applies to a supply of goods or services, and therefore where and by whom the tax must be accounted for.

The turnover level above which a business must register for a transaction tax, with voluntary registration possible below it; monitoring turnover against the threshold is a core compliance task.

A written agreement setting out the scope of services, responsibilities of both parties, fee basis and limitations of the work; it protects both client and practitioner and should be issued before work begins.

A restriction on the work a practitioner is engaged to perform, whether imposed by the client or by circumstances; it must be documented and may require a modified report or referral.

An attitude of questioning and critical assessment of the information and explanations provided, rather than accepting them at face value, especially where they appear inconsistent or unusual.

A situation where a practitioner's duties to one client, or their own interests, could compromise objectivity towards another; it must be identified, disclosed and managed, often by declining the engagement.

Freedom from relationships or interests that a reasonable observer would see as compromising objectivity, particularly relevant where a practitioner provides an opinion on information they have prepared.

The ethical obligation to exercise professional judgement without bias, undue influence or pressure from clients, employers or others with an interest in the outcome.

The duty not to disclose client information obtained through professional work without authority, subject to statutory exceptions such as legal requirements, money laundering reporting or client-permitted disclosure.

The statutory duty of certain professionals to report suspicions of money laundering or terrorist financing to the authorities, without tipping off the client, and to maintain supporting records.

Arranging a client's affairs within the law to use reliefs and exemptions efficiently, distinguished from avoidance by being consistent with the purpose of the legislation and disclosed appropriately.