Interviewing a CASS accountant is harder than interviewing for most finance roles, because the stakes of a wrong hire are higher and there are many ways a CV can overstate CASS experience. “CASS experience” might mean owning the client money calculation and the oversight framework, or it might mean running a reconciliation someone else designed without understanding why. The difference matters enormously in a role where a missed breach can end a firm. This guide sets out CASS accountant interview questions — technical, reconciliation, oversight and behavioural — and, crucially, a set of real breach scenarios with model answers, because how a candidate reasons through a live CASS problem reveals more than any factual question. It supports our CASS recruitment practice and complements the CASS job description and salary guide.
How to interview for CASS
Two principles should shape a CASS interview. First, test applied judgement over recited knowledge: anyone preparing for a CASS role can memorise the reconciliation frequencies, but only someone with real experience can reason through what to do when a reconciliation will not balance at 4pm on a Friday. The breach scenarios below are the heart of the interview for exactly this reason. Second, probe for the temperament the role demands as hard as the technical knowledge — precision, investigative rigour and, above all, the integrity to escalate a breach rather than conceal it. A technically brilliant CASS accountant who would quietly fix a breach to avoid difficult conversations is more dangerous than a less polished one who escalates properly.
Structure the process in two stages where you can: technical and reconciliation competence first, then scenarios, oversight and behaviour, ideally with the CASS oversight officer or the senior manager holding the prescribed CASS responsibility involved. If you also use a competency framework, our guide to competency-based finance interview questions shows how to structure the behavioural half, and interview preparation for regulated-firm finance covers what good candidates will have prepared.
Foundational CASS knowledge questions
Establish the baseline before going deeper.
1. Explain the difference between CASS 6 and CASS 7. The foundational question. A strong answer distinguishes custody assets (CASS 6) from client money (CASS 7) clearly, and ideally notes how the reconciliation and segregation requirements differ between them.
2. Walk me through the client money calculation. Core competence for any client-money role. Look for genuine understanding of the client money resource and requirement, the segregation it drives and the frequency it is performed — a working grasp, not a memorised definition.
3. What is the difference between the internal and external client money reconciliation? Tests whether the candidate understands both control points — records against the internal calculation, and records against bank and custodian statements — and why both are needed. Our CASS reconciliation in practice guide sets out the distinction and the daily routine behind it.
4. What is the CASS Resolution Pack, and what goes in it? Reveals oversight-level knowledge. The Resolution Pack exists so client money and assets can be returned quickly if the firm fails; a candidate who understands its purpose and contents — and that each document must be retrievable within 48 hours — has genuine CASS depth.
5. How do the CASS rules interact with the SMCR? Tests awareness of the governance context — the prescribed CASS responsibility, personal accountability, and how the CASS accountant’s work supports the accountable senior manager. Our SM&CR guide for finance teams covers this.
The CASS rules a candidate should know cold
Use this as the panel’s crib sheet. A credible CASS candidate should be able to state each point without prompting and, more importantly, explain why it exists. The FCA’s client money and assets pages are the primary reference.
| Rule | What a strong candidate says |
|---|---|
| Internal client money reconciliation | Performed each business day (CASS 7.15), checking the firm’s records against its calculation of what it should hold for clients. |
| External reconciliation | Records against bank and third-party statements, as often as necessary and at least monthly. |
| Shortfall | Funded from the firm’s own money by close of business on the day the reconciliation is performed, while the cause is investigated. |
| FCA notification | The FCA must be told in writing without delay if the firm cannot perform a reconciliation or make good a shortfall, alongside the firm’s own breach log and escalation. |
| CMAR | CASS medium and large firms submit the Client Money and Asset Return monthly, within 15 business days of the period end, through RegData (which replaced GABRIEL). |
| CASS Resolution Pack | Kept current, with each document retrievable within 48 hours (CASS 10), so an insolvency practitioner can return client money and assets quickly. |
| Acknowledgment letters | Required for client bank and third-party accounts so the institution recognises the money as client money and cannot set it off against the firm’s debts. |
| CASS 15 (payments and e-money) | Safeguarding rules for payment and e-money institutions in force from 7 May 2026: daily internal safeguarding reconciliations, a monthly safeguarding return, an annual safeguarding audit and a resolution pack. |
A candidate who can recite the table but cannot explain the client harm each rule prevents has learned CASS from a course. Probe the “why”.
Reconciliation and process questions
The daily craft of the role.
6. Take me through how you perform a client money reconciliation from start to finish. The detailed process question. Strong answers describe the sources, the matching, the treatment of differences, the timing and the sign-off — the lived process, not a textbook summary.
7. How do you investigate a reconciliation break? Reveals investigative rigour. Look for a systematic approach — identifying the type of difference, tracing it to source, resolving the cause rather than the symptom — and a clear sense of the clock, because breaks that age become breaches.
8. What would cause a shortfall in the client money calculation, and what do you do about it? Tests understanding of the calculation’s real dynamics. A strong answer describes the causes (timing, errors, unreconciled items) and the immediate action — funding the shortfall from the firm’s own money the same day, and investigating the cause.
9. How do you ensure the completeness of the client money records — that nothing is missed? Completeness is the subtle risk in CASS: it is not just that recorded items reconcile, but that everything that should be recorded is. Strong candidates recognise this distinction.
Breach scenarios — the heart of the interview
These are the questions that separate genuine CASS experience from claimed familiarity. Present each as a live situation and ask the candidate to reason through it. The model answers describe what a strong response contains — and the reasoning matters more than reaching a single “right” answer.
Scenario 1: The Friday afternoon break. “It is 4pm on Friday. Your daily internal client money reconciliation shows a shortfall of £40,000 that you cannot immediately explain. What do you do?” A strong answer: acts on the shortfall first — ensures the firm tops up the segregated amount from its own money before close of business that day, so clients are protected while the investigation runs, because client protection does not wait for the explanation. Then investigates the cause methodically, documents everything and — critically — assesses whether this is a reportable CASS breach, escalating to the CASS oversight officer or accountable manager rather than sitting on it over the weekend. If the shortfall could not be funded, the FCA must be told in writing without delay. The weak answer hunts the error and treats escalation as a Monday problem. The tell is whether the candidate protects client money first and escalates promptly.
Scenario 2: The commingled receipt. “You discover that client money has been received into the firm’s own account and sat there for three days before anyone noticed. How do you handle it?” A strong answer: recognises this immediately as a CASS breach — client money was not segregated as required — and does not minimise it. Moves the money to the correct client account promptly, quantifies the breach (amount, duration, any others like it), logs and reports it through the firm’s breach process, investigates how it happened (a process gap, a coding error, a new client not set up correctly) and fixes the root cause so it cannot recur. Treating it as an admin fix rather than a reportable breach is a dangerous gap in CASS judgement.
Scenario 3: The pressure to delay. “You identify a breach late in the day. A senior colleague suggests you resolve it quietly overnight and mention it in next month’s report if it is still relevant. What do you do?” A strong answer: declines, politely but firmly. Explains that CASS breaches must be logged and reported through the proper process regardless of whether they are quickly resolved, that the accountable senior manager needs to know, and that concealing or delaying a breach is itself a serious failing that compounds the original problem — and, under the SM&CR Conduct Rules, a personal one. This scenario tests integrity under pressure, the single most important quality in a CASS accountant, and the right answer holds the line on escalation even against seniority. A candidate who wavers here should not hold a CASS role, however strong their technical knowledge.
Scenario 4: The acknowledgment letter gap. “During a review you find that one of the firm’s client bank accounts is missing its acknowledgment letter from the bank. What is the significance, and what do you do?” A strong answer: understands why acknowledgment letters matter — they confirm the bank recognises the account as holding client money, without which the segregation may not be effective if the firm fails — and treats the gap seriously. Investigates whether client money is in the account, assesses the breach, escalates it and gets the acknowledgment in place urgently, while checking whether the gap exists elsewhere. Reveals whether the candidate understands the legal substance of segregation, not just the reconciliation.
Scenario 5: The audit finding. “The CASS auditor raises a finding that your reconciliation methodology has been wrong for six months. How do you respond?” A strong answer: engages with the finding rather than defending reflexively — understands the auditor’s concern, assesses the impact (were breaches caused? was client money at risk?), quantifies and reports as required, corrects the methodology and remediates the historical position. Shows maturity in handling being wrong. A defensive answer is a red flag in a role where auditors and regulators are permanent stakeholders; our guide to the CASS audit and beyond explains what auditors test.
Hiring a CASS accountant? — 0204 553 8893
We recruit CASS accountants, client money managers and safeguarding specialists, permanent and interim. We respond to every brief the same working day; permanent shortlists typically follow within one to two weeks and interim candidates within days.
Oversight and judgement questions
For senior and oversight-level roles, probe the governing dimension. The difference between the two jobs is set out in CASS oversight vs CASS operations.
10. How would you design or improve a firm’s CASS oversight framework? Tests strategic CASS thinking. Strong answers cover the monitoring, the MI, the governance and how oversight connects to the accountable senior manager — the difference between doing CASS and governing it.
11. What CASS management information would you produce for the board? Reveals whether the candidate understands what oversight needs to see — reconciliation performance, breaches, ageing, CMAR accuracy, trends — and can distinguish signal from noise for a board audience.
12. How do you keep a firm’s CASS arrangements current as the business changes? Tests forward-looking judgement — new products, new accounts and new jurisdictions all have CASS implications, and the strong CASS accountant is consulted before changes, not after.
Behavioural and integrity questions
The temperament checks.
13. Tell me about a time you identified a breach or control failure. What did you do? The integrity question in behavioural form. Look for a real example handled properly — identified, escalated, resolved, prevented — without concealment or drama.
14. Describe a time you had to challenge someone more senior on a compliance matter. Tests the standing to escalate against hierarchy — essential in CASS, where the accountant may need to insist on proper treatment against commercial pressure.
15. How do you maintain accuracy in a role that is repetitive but where small errors have large consequences? Reveals self-awareness about the role’s central demand — sustained precision — and whether the candidate has genuine strategies for it rather than relying on willpower.
Questions a strong CASS candidate will ask you
The best candidates interview the firm, and their questions reveal their depth. Expect — and welcome — questions like: Who holds the prescribed CASS responsibility, and how engaged are they? What did the last CASS audit find? How are breaches currently logged and escalated? Is CASS oversight separate from operations here? What is the reconciliation technology, and how much is manual? Has the firm ever had to notify the FCA of a reconciliation failure? A candidate asking these understands the governance and risk dimensions and is checking whether the firm takes CASS seriously — the strongest candidates do not want to inherit someone else’s unremediated problem.
Three more breach scenarios for deeper interviews
Where a role is senior or the firm’s CASS profile is complex, extend the scenario set.
Scenario 6: The custody discrepancy. “Your CASS 6 reconciliation shows the firm’s records say it holds 10,000 units of a security in custody, but the custodian statement shows 9,800. What do you do?” A strong answer: treats the shortfall in safe custody assets as seriously as a client money shortfall — investigates urgently (a settlement timing difference, a mis-processed corporate action, a genuine loss?), assesses client impact and whether a breach has occurred, escalates and resolves the cause. Does not assume timing without proving it, because custody discrepancies can reflect real asset loss.
Scenario 7: The new product. “The business wants to launch a new product next month that will involve holding client money in a way the firm has not before. You are told after the decision is made. How do you respond?” A strong answer: engages constructively but insists on assessing the CASS implications properly before launch — the segregation, the account structure, the reconciliation approach, the acknowledgment letters, the policy and resolution pack updates — and flags that CASS should have been consulted before the decision, not after. Reveals whether the candidate sees CASS as built into change, and has the standing to slow a commercial decision when client protection requires it.
Scenario 8: The inherited mess. “You join a firm and discover within a fortnight that the CASS reconciliations have been performed inconsistently, the Resolution Pack is out of date, and you suspect there may be unreported historical breaches. What is your plan?” A strong answer: prioritises — establishes the current client money position first (is client money protected right now?), then works back through the historical issues, quantifying and reporting breaches as required rather than burying inherited problems, and builds a remediation plan with the oversight officer and, where needed, external support. Once discovered, inherited problems are the incumbent’s to report and fix. This scenario tests leadership and integrity at once and suits senior and oversight interviews.
Further breach scenarios: reporting, resolution packs and safeguarding
Four more scenarios covering the areas candidates most often skip in preparation: regulatory returns, wind-down readiness and safeguarding. Our comparison of CASS 7 and CASS 15 experience explains what transfers between the regimes.
Scenario 9: The wrong CMAR. “Preparing this month’s CMAR, you notice last month’s return, already submitted through RegData, overstated the client money held by £1.2 million because of a mapping error. What do you do?” A strong answer: first checks whether the same mapping fed the client money calculation, because a reporting error and a segregation shortfall are very different problems. Escalates, agrees the resubmission with compliance, considers whether the FCA needs telling beyond the corrected return, fixes the mapping and checks earlier periods. The weak answer quietly corrects next month and says nothing. Our guide to regulatory reporting through RegData covers the wider reporting discipline.
Scenario 10: The resolution pack drill. “Internal audit runs an unannounced test: produce the CASS Resolution Pack. Two documents — the master list of client bank account acknowledgment letters and the third-party administrator agreements — cannot be located within 48 hours. How serious is this?” A strong answer: treats it as a breach of the 48-hour retrieval requirement, not a filing inconvenience — if the firm failed, an insolvency practitioner would be slowed returning client money, the harm CASS 10 exists to prevent. Logs it, escalates, rebuilds the missing items, assigns document owners and repeats the drill.
Scenario 11: The bank holiday safeguarding shortfall. “You are at an e-money institution. On a bank holiday Monday, when the firm is still processing customer payments, the internal safeguarding reconciliation shows relevant funds short by £85,000. The treasury team says it can wait until Tuesday. What do you do?” A strong answer: explains that under CASS 15 a business day can include any day the firm executes payments, so the shortfall should be funded from the firm’s own resources by close of business today — and if it cannot be, the FCA must be told in writing without delay. Escalates, investigates the cause (a late settlement, a failed sweep, a mis-booked refund) and documents the decisions. Tests whether a CASS 7 candidate has genuinely absorbed the safeguarding regime.
Scenario 12: The unexplained external difference. “Your external reconciliation shows the bank balance on a client account is £22,000 lower than your records, and after a day’s work you still cannot explain it. Your manager suggests carrying it as an open item for the month.” A strong answer: refuses to carry an unexplained shortfall. Treats the record showing the higher amount owed to clients as correct until resolved (the explicit CASS 15 approach, and prudent under CASS 7), funds the gap from firm money, escalates and keeps investigating. Distinguishes an evidenced timing difference, which can be carried, from an unexplained one, which cannot.
Scoring the scenarios: what separates strong from weak
Across all the scenarios, the same markers distinguish the candidates worth hiring. Client protection first: the strong candidate’s instinct is always to protect client money or assets immediately — top up the shortfall, move the commingled money — before turning to investigation, because clients cannot wait for the diagnosis. Prompt escalation: they log and report breaches through the proper process without prompting and without minimising, treating escalation as an obligation rather than a judgement call. Root-cause thinking: they resolve the cause, not just the symptom, so the problem does not recur. Integrity under pressure: they hold the escalation line even against seniority or commercial pressure. And proportionate calm: they treat breaches seriously without panic, working the problem methodically.
The weak candidate reaches for the quiet fix, treats escalation as optional, resolves symptoms, wavers under pressure, or panics or under-reacts. None of these markers is technical — they are judgement and temperament, which is why scenarios reveal what factual questions cannot.
A scoring guide for the interview panel
Score each scenario from 1 to 4 against the five markers, plus a technical score from the knowledge questions. Panel members should score independently before discussing.
| Score | What the answer looks like |
|---|---|
| 4 — Strong | Protects client money first, names the specific rule and deadline (same-day funding, written notification without delay), escalates unprompted, goes to root cause and checks for the same problem elsewhere. |
| 3 — Competent | Right actions in roughly the right order; needs one prompt on escalation or root cause; rule detail mostly accurate. |
| 2 — Partial | Focuses on finding the error; escalation appears only when prompted; treats the breach as an internal tidy-up; vague on deadlines. |
| 1 — Concern | Suggests delaying, netting off or quietly correcting; cannot explain why the rule exists; defensive when challenged. |
Two rules of thumb. Any score of 1 on Scenario 3 (pressure to delay) should be disqualifying, whatever the rest of the scorecard says. And for oversight roles, weight Scenarios 7, 8 and 10 double, because they test the governing judgement the role exists to provide.
Tailoring the interview to the role
Finally, weight the interview to the specific CASS role. For an operations role, emphasise the reconciliation and process questions and the first-response scenarios (the Friday shortfall, the commingled receipt, the unexplained external difference) — the daily craft and the immediate-response instincts. For an oversight role, emphasise the framework, MI and governance questions and the judgement-heavy scenarios (the new product, the inherited mess, the resolution pack drill) — the governing dimension and the standing to challenge. For a combined role in a smaller firm, cover both and probe whether the candidate can genuinely span the doing and the governing — the hardest capability to find.
Whatever the weighting, keep at least two or three breach scenarios in every CASS interview — they most reliably reveal whether the CASS experience on the CV is real, and strong candidates enjoy them. Where the role carries the compliance oversight or MLRO function itself (SMF16 or SMF17), that is a senior manager appointment our sister firm SMF Capital handles.
CASS salary context for interviewers
A candidate who scores 4s across the scenarios will usually have other options. Current ranges, consistent with our regulated-firm finance salary guide:
| Role | London | Regional UK |
|---|---|---|
| CASS Accountant / Client Money Accountant | £52k–£72k | £44k–£61k |
| Senior CASS Accountant | £65k–£85k | £55k–£72k |
| CASS Manager / Head of Client Money | £75k–£100k | £64k–£85k |
| Interim CASS Accountant | Typically £380–£520 a day | |
Demand from payments and e-money firms since CASS 15 took effect has pulled CASS 7 candidates across, tightening both pools. The reasons regulated roles carry a premium are covered in why regulated finance roles pay more. If you need cover while a permanent search runs, an interim CASS accountant can hold the reconciliation and breach log steady; see interim and fractional finance in FCA-regulated firms.
Frequently asked questions
How many breach scenarios should a CASS interview include?
At least two or three at every level, and five or six for senior and oversight roles. Always include the pressure-to-delay scenario, because it is the clearest test of the integrity the role depends on.
Should we set a written reconciliation test?
A short, timed exercise — a reconciliation with two planted breaks and one timing difference — works well for operations roles. Keep it under an hour and use your own anonymised format so candidates cannot have rehearsed it.
Is CASS 7 experience enough for a CASS 15 safeguarding role?
Often, with the right questions. The reconciliation discipline transfers well; what needs testing is understanding of relevant funds, the business-day definition for payment firms, the monthly safeguarding return and the annual safeguarding audit. Our guide to hiring a safeguarding accountant covers the differences.
Who should sit on the interview panel?
Ideally the hiring manager, the CASS oversight officer or the senior manager holding the prescribed CASS responsibility, and someone from compliance. For a first CASS hire in a smaller firm, an external CASS specialist or your CASS auditor’s view of the brief can help calibrate the questions.
How quickly can you provide CASS candidates?
We respond to every brief the same working day. Permanent shortlists typically follow within one to two weeks; interim candidates are usually available within days. Fees are agreed in writing before a search starts.
Adrian Lawrence FCA — Founder, Accountancy Capital
Fellow of the ICAEW | Chartered Accountant holding an ICAEW practising certificate | Part of FD Capital Group
Adrian is a former listed-company Finance Director who founded FD Capital in 2018 and later Accountancy Capital, which recruits qualified finance professionals below director level, including CASS and safeguarding specialists for FCA-regulated firms. Our recruitment team uses scenario-based questions like these to test whether CASS experience on a CV is real before a candidate reaches a client.
Related Pages and Resources
CASS Recruitment
Permanent and interim client money specialists.
CASS in Practice
The daily work the scenarios test.
→ CASS reconciliation in practice
Regulated Finance
Governance and hiring across FCA-regulated firms.
→ SM&CR explained for finance teams
Talk to us about CASS hiring — 0204 553 8893
From a first CASS accountant to a head of client money or an interim safeguarding specialist, our recruitment team can help you define the brief and test candidates properly. Email recruitment@accountancycapital.co.uk or call us; we reply the same working day.