Most interview questions in accounting recruitment are theatre. "What is your greatest weakness?" produces rehearsed answers. "Tell me about yourself" produces a CV recital. The seven questions below are different: each has been used at scale by experienced recruiting partners and each correlates with observable on-the-job performance in the first 18 months. Use them, score them honestly, and your hire quality will move.
1. "Tell me about a client situation that went wrong on your watch and what you did next."
What you are listening for: ownership without melodrama, specific actions, what was learned. What disqualifies: blaming the client, blaming the manager, claiming nothing has ever gone wrong, vague generalisations. Candidates who cannot describe a single concrete failure are either inexperienced (acceptable in a trainee, concerning in a senior) or unwilling to be honest under polite questioning (always concerning). The follow-up "and what would you do differently?" sharpens the signal further.
2. "Walk me through how you would explain a £4,000 unexpected corporation-tax bill to a sole director who wasn't expecting it."
Tests technical understanding (do they get the basics of CT and dividend planning), communication ability (can they explain it in plain language without jargon), and emotional intelligence (do they account for the client's likely reaction). Strong candidates structure the answer: what happened, why, what we do now, what we change for next year. Weak candidates start with HMRC legislation references and lose the room within thirty seconds.
3. "What is the last technical thing you read that surprised you, and what did you do about it?"
The cheapest screen for genuine intellectual curiosity. Engaged practitioners read ICAEW updates, FRC consultation responses, HMRC manuals, tax journals, accounting Twitter, Substack newsletters. They have opinions. Candidates who cannot name anything they have read recently outside their formal study material are signalling that the technical work bores them. Acceptable in some roles; disqualifying for advisory positions.
4. "Describe a time you disagreed with a more senior colleague. How did you handle it?"
Tests for assertiveness without arrogance and for psychological safety expectations. Strong candidates describe a real disagreement, a respectful escalation, an outcome (which may include "I was wrong, here is why"). Weak candidates either claim they have never disagreed (improbable, and unhelpful in a firm that needs honest peer review) or describe a confrontation that escalated unproductively. Look for the "and we still work well together now" finishing note; it is the strongest positive signal.
5. "When you have too much to do, walk me through how you decide what gets dropped."
Tests practical prioritisation and self-awareness about capacity. Strong candidates describe a real triage process: regulatory deadlines first, client commitments second, internal work third, with a step where they tell someone what is being deferred. They acknowledge that things are sometimes genuinely dropped, not just "worked harder on." Weak candidates claim they "just push through" or "stay late until it is done," which signals future burnout and future resignations.
6. "Tell me about a process you changed at a previous firm that the firm actually adopted."
The improvement-orientation screen. Strong candidates can name a specific change, who they had to convince, what data they used, and what the result was. The change does not need to be dramatic: shifting from email to a portal for document collection, restructuring a recurring monthly bookkeeping checklist, automating a fee reminder. Weak candidates either claim they had no scope for change or describe a change that nobody adopted, with no reflection on why.
7. "What would your previous manager say is the most annoying thing about working with you?"
Tests self-awareness directly. Honest, useful answers acknowledge something real and minor: "I over-document things in writing because I want a record," "I push back on deadlines I think are unrealistic," "I get frustrated when meetings run long without decisions." These are usable, manageable traits. Useless answers include "I work too hard" (heard) and "nothing, we got on great" (improbable). Candidates who cannot identify any real friction are usually telling you they do not reflect.
What you are not interviewing for
You are not interviewing for charisma, polish, or interview skill. UK accounting practice is not a sales floor. The candidates who interview best on superficial dimensions sometimes turn out to be the strongest hires; equally often they turn out to be the people who quietly underperform once the interview pressure is off and the real work begins. Score the substance of the answers, not the smoothness of the delivery.
A simple discipline: write down the candidate's answer to each question in three lines or fewer, then score the substance from one to five before you discuss with the rest of the panel. The notes-first approach reduces the influence of vibe and recency on the final decision. Hire quality improves.
Structured panels and reference checks still beat gut feel
Even with the seven questions above, the highest-validity hiring decision involves two interviewers using a written scorecard, a small piece of real-world work (a sample VAT review, a sample client email draft), and at least two direct reference checks with previous managers. Skipping any of these in favour of "I trusted my gut on this one" is the single largest preventable cause of hiring mistakes in small firms.
A practice-management platform like Accupe is not a recruitment tool, but it does give you the data to evaluate your hires honestly six months in. Track first-180-day performance against interview score consistently and you will quickly see which questions and which interviewers actually predict outcomes in your specific firm.
Closing
Hiring is the most expensive decision an accounting firm makes per pound spent. Getting it right is not about clever questions; it is about disciplined questions, disciplined scoring, and honest post-hire calibration. The seven above are a solid starting set. Use them in every interview for a year, score consistently, and review the scorecards against actual performance the following January. Your future hires get better. So do your future retention numbers.