Effective Tax Rate in Interviews

Going through 2026 SA interview prep and see that most practice interview questions use 40% as a tax rate. I know in reality it's closer to ~20%, was curious if anyone has recent experience in interviews and what rate they used when going through the "walk me through" type questions and/or if interviewer lets you choose. Thanks.

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Based on the most helpful WSO content, when it comes to interviews, it's common to use a 40% tax rate for simplicity in practice questions and technical exercises. This is a standard assumption to make calculations straightforward and consistent. However, in real-world scenarios, the effective tax rate can vary significantly, often closer to 20% depending on the jurisdiction and specific company circumstances.

If you're in an interview and asked to "walk through" a scenario, it's a good idea to clarify your assumption upfront. For example, you could say, "For simplicity, I'll assume a 40% tax rate unless you'd prefer I use a different figure." This demonstrates both your technical knowledge and your ability to communicate effectively.

Sources: https://www.wallstreetoasis.com/forum/investment-banking/sa-interview-prep-techniques?customgpt=1, 20 Most Frequently Asked Questions - London Edition, SA interviews – an interviewer’s perspective, Notes for Technical Interview Questions, Effective Tax Rate in NYC

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Wanna go the extra mile? A little tax knowledge can help. Couple of tips from someone in the tax field:

  • Tax rate is going to vary depending on the fact pattern that is presented to you. If you're working with an entity that is treated as a corporation for US tax purposes, the federal rate is 21% and state and local rates will depend on where it does business. If the entity is a pass-through (like a partnership), the ultimate owner of that entity is liable for tax at their specific tax rate.
  • Again, let's assume you're working with a corp. The federal rate is 21% but the effective rate can be reduced by any of a number of expenses. That includes state and local taxes as well as interest payments on debt to third or related parties. This is why corporate entities are often capitalized with a shareholder loan: it can extract cash from the business and reduce the effective tax rate.
  • Final assumption: you have a corp without any expenses except for state tax at a 9% rate (that's a little high for a state tax but in the ballpark). Your effective tax rate will end up being 19.1% (21% * (1 - 9%)). This gets you closer to that 20% rate you were expecting in the first place. But don't forget, this is just the entity-level tax. Pay a dividend to your shareholders and they may pay a 20% qualified dividend rate. If you factor that cost in, boom, you're back up to around 40%. In my experience, it's not common to combine the two--entity and personal tax--so asking for clarity on the question will show attention detail that can raise your profile.
 

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