Fernandez [2004; The value of tax shields is NOT equal to the present value of tax shields. Journalof Financial Economics, 73, 145–165] claims to derive a formula for the valuation of debt tax shieldsfor firms with cash flows that growperpetually at a constant rate.We showthat his formula is...

In a forthcoming paper, Fernandez (2002) claims to derive a formula for the valuation of debt tax shields for firms with cash flows that grow perpetually at a constant rate. We show that his formula is incorrect and provide an example where his valuation would admit arbitrage