Top 10 Technical Mistakes Candidates Make in IB Interviews
Avoid these common technical errors that cost candidates offers at top investment banks.
Key Takeaways
- The most common technical mistakes that cost IB candidates offers are predictable and avoidable, led by not knowing your resume cold and confusing enterprise and equity value.
- Enterprise value covers all stakeholders while equity value is just shareholders, so you should know when to use each and how to bridge between them.
- When accounting for depreciation or interest, remember the tax shield: a deductible expense saves money equal to the expense times the tax rate.
- Asking clarifying questions like the industry or tax rate signals thoughtfulness and buys you thinking time, while practicing answers out loud builds the articulation that silent review misses.
The most common technical mistakes that cost investment banking candidates offers are predictable and avoidable: not knowing your resume cold, confusing enterprise and equity value, fumbling the three-statement walk, forgetting the tax shield, and giving textbook answers without real understanding. This list draws on patterns from thousands of Superday AI mock interviews, with the fix for each.
1. Not Knowing Your Resume Cold
Every number and experience on your resume is fair game. If you mention a valuation project, be ready to explain your methodology. If you list a GPA, know your exact number. Interviewers lose confidence when candidates stumble on their own experience.
2. Giving Textbook Answers Without Understanding
Memorizing that "depreciation is a non-cash expense" isn't enough. You need to understand why it matters and how it flows through the statements. Interviewers probe understanding with follow-up questions.
3. Forgetting the Tax Shield
When calculating the impact of depreciation or interest expense, many candidates forget the tax implications. Remember that deductible expenses save money equal to the expense times the tax rate.
4. Confusing Enterprise and Equity Value
This is a fundamental concept that trips up many candidates. Enterprise value includes all stakeholders, while equity value is just for shareholders. Know when to use each and how to bridge between them.
5. Not Walking Through the Three Statements
If you can't cleanly walk through how the three financial statements connect, you're not ready for interviews. This should be automatic.
6. Blanking on Basic Formulas
Practice until WACC, EBITDA, and DCF formulas are second nature. Nerves cause blanks, and nothing kills momentum like forgetting basic formulas.
7. Ignoring Reasonableness Checks
When doing mental math or market sizing, always sanity check your answer. Does a $500 billion market size for golf balls make sense? Probably not.
8. Not Asking Clarifying Questions
Many technical questions are intentionally vague. Asking "What industry is the company in?" or "What's the tax rate?" shows thoughtfulness and buys you thinking time.
9. Overcomplicating Answers
Start simple and add complexity only if asked. A clear, basic answer beats a confusing advanced one.
10. Not Practicing Out Loud
Knowing an answer in your head is different from articulating it clearly. Practice explaining concepts verbally, ideally to someone who can challenge you.
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Topics covered:
Sources
- Discounted Cash Flow Valuation - Aswath Damodaran. Aswath Damodaran (NYU Stern) (accessed 2026-05-14)
- A Tangled Web: Enterprise, Firm and Equity Value - Aswath Damodaran. Aswath Damodaran (NYU Stern) (accessed 2026-05-14)
- Equity Valuation - CFA Institute Refresher Reading. CFA Institute (accessed 2026-05-14)