Corporate report

Definitions for metrics used in the performance report

Published 14 August 2025

Close the tax gap

Metric Definition
Total compliance yield Compliance yield is the estimate of revenues that would otherwise have been lost if not for HMRC’s compliance activity and the impact of policy changes to address non-compliance.
Cash expected from compliance The amount of additional revenue due when we identify past non-compliance and that we reasonably expect to collect (note: cash expected includes tax related penalties plus interest). A 10% reduction is also applied in some circumstances to reflect revenue that we estimate may not be collected. for example where a business subsequently becomes insolvent after the compliance check has been completed.
Revenue loss prevented (RLP) Revenue that we prevented from being lost to the Exchequer through our compliance work. RLP recognises the compliance yield where a fraudulent or erroneous claim to a relief or repayment is either reduced or refused. RLP also recognises the estimated value of refused registrations, disruption of criminal activity and the revenue value of seized goods.
Future revenue benefit The estimated impacts of our compliance work on customers’ future compliance. Future revenue benefit is estimated for each year we expect continued compliance from the customer to impact the Exchequer.
Upstream yield The sum of upstream product and process yield and upstream operational yield.
Upstream Product and Process Yield The estimated annual impact on net tax receipts of legislative changes to close tax loopholes and changes to our processes which reduce opportunities to avoid or evade tax.
Upstream Operational Yield The estimated impact of operational activities undertaken to promote compliance and prevent non-compliance before it occurs, for example, through a range of activities such as education, nudges and prompt campaigns. This was categorised with Cash Expected until 2019 to 2020.
Positive Charging Decisions Positive charging decisions (PCDs) are the actual decisions made by independent prosecuting authorities to authorise the charging of an individual.
Total prosecutions The total number of cases which have gone before the courts (including convictions plus acquittals). This will include pre-trial guilty pleas.
Success rate at court (%) The percentage of prosecutions when the pre-trial plea or trial outcome is recorded as guilty
Criminal sentences — custodial (years) The cumulative total of custodial sentences, in years, as determined by HM Courts and Tribunals Service (HMCTS) once our investigations have concluded and the outcome of the associated prosecutions have been determined.
Criminal sentences — suspended (years) The cumulative total of suspended custodial sentences, in years, as determined by HMCTS once our investigations have concluded and the outcome of the associated prosecutions have been determined.
Closed criminal investigations The number of criminal investigations that have formally been closed. Criminal Investigations are closed at all stages throughout the lifecycle of an investigation for numerous reasons — including (but not limited to): those that have been successfully prosecuted (be it in the year in question or in previous years, as cases remain open until confiscation action has concluded where applicable); where evidence being obtained shows that there is no case to answer; individuals becoming unfit for prosecution; insufficient evidence; and the decision to resolve the matter using an alternative disposal.
Total debt balance (£ million) Total debt that is collectable and enforceable
Managed debt Managed debt is mostly debt that is within a time to pay type arrangement, and end of strategy debt which includes debts that have reached the end of their pursuit process and may be considered for remission.
Debt available for pursuit Debt available to be pursued through regular debt management activities.
Value of new debt Value of overdue debt which transfers to HMRC’s debt collection system.
Value of debt cleared Value of debt items cleared within the month. Cleared refers to collected, remitted and written-off.
Number of customers in Time to Pay arrangements Number of taxpayers paying an overdue debt via instalment arrangements.
Number of HMRC reviews concluded The total number of upheld, varied and cancelled statutory reviews.
Number of HMRC decisions upheld The number of decisions that have been upheld at statutory review without any changes. For example, a tax assessment where the full amount of the original tax assessed is due.
Upheld rate The percentage of the statutory reviews concluded where the original decision was upheld.
HMRC litigation court and tribunal decisions The total of HMRC litigation wins, part wins and losses.
HMRC litigation win Tax appeals and tax-related judicial review claims have been ruled on by the court or tribunal, with the matter determined entirely in HMRC’s favour.
HMRC litigation part win Tax appeals and tax-related judicial review claims where the court or tribunal ruled a different amount than originally set, or where key parts of HMRC’s case succeeded.
HMRC litigation loss Tax appeals and tax-related judicial review claims that the court or tribunal determined fully in the customer’s favour.
Litigation success rate (%) The success rate is calculated as the percentage of court and tribunal decisions that are in HMRC’s favour or where substantive elements of HMRC’s case succeeded.

Improve day-to-day performance and the overall customer experience

Metric Definition
Customer interactions through automated or digital self-serve channels (% of all customer interactions) The percentage of digital self-serve channel interactions that allow customers to access information and/or perform activities online without requiring direct support or interaction with a member of HMRC staff.
Personal Tax Account – sessions The number of customer sessions (interactions) through the Personal Tax Account
Business Tax Account – sessions The number of customer sessions (interactions) through the Business Tax Account
HMRC app — sessions The number of customer sessions (interactions) through the HMRC app.
HMRC app — new users The number of new unique national insurance numbers accessing the HMRC app for the first time.
% Overall customer satisfaction A survey-based measure of the percentage of HMRC customers who responded that they were either ‘satisfied’ or ‘very satisfied’ with the service. This is based on a self-selecting sample of customers of telephone, webchat and digital services.
Net easy An exit survey based on a self-selecting sample of customers of telephone, webchat and digital services. The survey question is: ‘How easy was it for you to do what you needed to do today?’ The scores represent the total of positive responses minus the total of negative responses. The score that can be achieved ranges from minus 100 to 100.
Once and done A survey-based measure of the percentage of customers who responded ‘yes’ when asked whether they were able to achieve what they needed to on the day they interacted with HMRC. This is based on a self-selecting sample of customers of telephone, webchat and digital services.
Webchats submitted Number of incoming webchats.
Webchats — average speed of answer Average time for a webchat to be answered by an adviser.
Webchats adviser attempts handled The proportion of customers taking up a webchat offer that successfully got through to a webchat adviser.
Telephony adviser attempts handled The proportion of callers that got through to an adviser after hearing the automated messages and choosing the option to speak to an adviser.
Number of calls received (contacts) Total number of calls received to our customer service lines. Includes those answered by an adviser, those abandoned, broadcasted messages or busy and those that go through our automated lines.
Number of call attempts handled The number of total telephone calls which are handled either after listening to a recorded informational message or go on to be handled by an adviser.
Call attempts handled % The proportion of total telephone calls which are handled either after listening to a recorded informational message or go on to be handled by an adviser.
Number handled by automated systems The number of calls handled after listening to a recorded informational message.
Number of adviser attempts The number of incoming calls after hearing automated messages and choosing to speak to an adviser.
Number of adviser attempts handled The number of callers that got through to an adviser after hearing the automated messages and choosing the option to speak to an adviser.
Calls not handled (abandoned, broadcasted messages or busies) The number of calls terminated by the customer in the queue or after listening to a broadcast message where we offer a limited service and long queues or where customers are played a ‘busy’ message. In each situation, the call is classified as not handled.
Average speed of answer (mm:ss) The average time spent waiting in the queue for an adviser. This is from the time that the customer finished listening to our automated messages and completed their selection from our automated menu to the time when they get to speak to an adviser.
% of customer calls waiting more than 10 mins Percentage of calls handled by an adviser where the time spent waiting in the queue for an adviser exceeds 10 minutes.
Average call handling time The average time taken for a call to be handled by an adviser. Includes time spent talking, on hold, and wrap (the time spent after the call to wrap up, either writing notes or performing actions related to the call).
% of correspondence cleared within 15 working days Correspondence (including post in the post and iForms) requiring a response to the customer cleared within 15 working days divided by total correspondence requiring a response to the customer. The day of receipt is counted as a day zero.
% of correspondence cleared within 40 working days Correspondence (including post in the post and iForms) requiring a response to the customer cleared within 40 working days divided by total correspondence requiring a response to the customer. The day of receipt is counted as day zero.
iForms received Items of correspondence that can be filled in and filed online.
Post receipts Post where customers may or may not require a response (does not include iForms filled in and filed online).
Post where customers require a response Post where customers require a response (does not include iForms filled in and filed online).
Total correspondence where customers require a response Correspondence where customers require a response. Includes post and iForms (iForms can be filled in and filed online).
VAT registrations clearance rate The proportion of VAT registrations cleared within 40 days.
Customs declaration clearance rate We aim to clear as many customs declarations selected for Route 1 documentary checks within 2 hours as possible (depending on channel). This is the volume of Route 1 declarations received and cleared within two hours.
Customs declaration receipts Number of Route 1 customs declaration received.
Tier 1 number of complaints received A Tier 1 complaint is the first stage of the complaint process and we aim to resolve the case at this stage.
Tier 1 % fully upheld Percentage of Tier 1 cases where we agree with the main part of a customer’s initial complaint.
Tier 1 % partially upheld Percentage of Tier 1 cases where we agree with some, but not all of a customer’s complaint.
Tier 1% not upheld Percentage of Tier 1 cases where we do not agree with a customer’s complaint.
Tier 2 number of complaints received A Tier 2 complaint is when a customer is dissatisfied with our decision on their initial complaint (Tier 1) and they have asked us to look at their concerns again.
Tier 2 % fully upheld Percentage of Tier 2 cases where we agree with the main part of a customer’s complaint.
Tier 2 % partially upheld Percentage of Tier 2 cases where we agree with some, but not all of a customer’s complaint.
Tier 2% not upheld Percentage of Tier 2 cases where we do not agree with a customer’s complaint.

Support wider government economic aims through HMRC’s work

Metric Definition
Value of recovered proceeds of crime Value of the proceeds of tax crime recovered using specialist asset recovery capabilities such as those in the Proceeds of Crime Act, the Insolvency Act and HMRC’s Code of Practice 9.