Robausting, adding to Bloodline’s comments:
I think the main source of confusion boils down to (A) the definition of WACC as well as (B) a mix up of Corporate Finance and Financial Reporting and Analysis concepts. I hope the following explanations help:
_ A. WACC definition _
WACC is NOT the cost at which the company managed to finance itself historically. If you look closely in the Cost of Capital reading in the Curriculum, you will find that WACC is described as the weighted average of the marginal cost of the various sources of capital (including debt).
Marginal means additional or new as opposed to historic. In other words WACC tells you how much, on average it would currently cost a company to raise new capital from its specific mix of financing sources.
_ B. Financial Reporting vs Corporate Finance _
Imagine that 1 year ago, a company issued a 2-year, 10% annual-pay coupon, $1,000 face value note at par (with issue proceeds equal to face value). Additionaly, assume that the note currently (with 1 year to go) trades at $982.14. You are right to say that:
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Irrespective of the note’ subsequent market value changes, the annual coupon amount would stay fixed at 10% of face value, i.e. $100 per annum. Market value changes do not impact the actual cash ouflow.
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The note would initially be recorded at an amount equal to the issue proceeds of $1,000 and subsequently carried at amortised cost. The rate at which interest would accrue on the note for financial reporting purposes would be based on its original (calculated at the time of issue) effective interest rate (or Yield to Maturity) which was 10% (the same as the coupon rate as the note was issued at par). Unless the note was marked-to-market, market value changes would not impact the way the note is accounted for in the balance sheet or income statement.
HOWEVER, for coporate finance purposes, you should note that the drop in market value (currently at $982.14) tells you that investors have increased their return expectations/requirements. If you compute the yield on an investment of $982.14 today which was scheduled to generate a cash flow of $1,100 1 year from now, you will find that it stands at 12% (up from 10% one year ago)
This tells you is that if the company were to issue new/additional/marginal debt today, it would face a higher financing cost than one year ago. In order to issue a $1,000 face value note at par (i.e. to receive $1,000 in issue proceeds) the company would have to promise investors a 12% coupon.
The marginal cost of additional capital has gone up = WACC has increased.