Since most North American companies face a tax rate of around 35%, it is tempting to apply this estimate blindly when running a back-of-the-envelope valuation of a company under consideration. However, due to certain credits, tax treaties, and subsidiary jurisdictions, companies can have very different tax rates, which can wildly throw off a valuation.
Consider Dorel (DII.B), a diversified manufacturer of juvenile products and furniture. Because its foreign subsidiaries operate in low-tax jurisdictions, its effective tax rate is only around 15%! Dorel's 2008 income before tax was $132 million, but thanks to its low tax rate this is equivalent to income before tax of $170 million (for a company with a 35% tax rate to have the same after tax earnings as Dorel)...a massive difference!
For an even more extreme example of how a company's tax rate can affect its valuation, read what we wrote about Gildan Activewear (GIL), a company that has managed to reduce its tax rate to practically zero!
For a more detailed discussion of Dorel as a possible value investment, see this article.
Disclosure: Author has a long position in shares of DII.B