hard · Investment Banking

You value a firm by APV. The unlevered value is $1,000m at an unlevered cost of capital k_u=10%. The firm carries $400m of debt at k_d=5% and a 25% tax rate, generating an annual tax shield of T,k_d,D=$5m. The treasury policy is to rebalance debt continuously to a constant percentage of firm value (Harris–Pringle assumption).

What is the PV of the interest tax shield, and the resulting levered value?

  1. $50m tax shield (discounted at k_u), for a levered value of about $1,050m, because rebalanced debt makes future shields as risky as the assets.
  2. $100m tax shield (discounted at k_d), for a levered value of about $1,100m, equal to T× D for permanent debt.
  3. $50m tax shield but a levered value of $950m, subtracting rather than adding the shield to unlevered value.
  4. $40m tax shield (discounted at k_u on an after-tax basis), for a levered value of about $1,040m.

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