Modelling Interest in Quarterly LBO

Hi all, quick question on the right way to calculate interest in a quarterly model. Assuming there is a debt instrument at 10% annual interest rate:

Do you just calculate this as 2.5% of average outstanding debt balance each quarter? If there's a cash sweep such that there's an irregular amount of paydown each quarter, wouldn't you arrive at an annual interest rate that is actually different than 10%? Is that okay?

Thanks!

EDIT TO ADD: One other thing I was thinking about - since interest is usually paid semi-annually, would you calculate interest as 5% off average balance from beginning and ending of 6 month period, and then divide by 2 to get the quarterly interest expense? Sorry, just confused about the right way to think about this

 
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Let's assume you have term loans.

Mandatory repayments happen on the last day of each quarter. There is no reason to assume anything other than a voluntary repayment on the last day of each quarter in your model *(more on this later).

As a result, for quarterly models, you do not average out principal balances and apply a rate, you take the balance at the beginning of the quarter and apply the rate.

*Most PE backed companies don't sweep excess cash quarterly, its just a modeling thing you do to juice returns. They have a mandatory excess cash flow sweep after they deliver their annual audit (which means this paydown occurs sometime in April / May). Then the company looks for good uses of non-swept cash (M&A, corporate projects, dividends, etc.).

 

Be careful because if you are doing that the effective rate would be higher than 10% annually

Apply some financial maths (1+r)^1 equal to (1+r4)^4, but definitely you could use 10%/4 if its a fast case study.as a proxy. Otherwise you would need to understand if the interest are compound or not... Some more context would help to understand the specific case.

 

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