"With the advent of IRS Section 409A and the introduction of certain fair value accounting rules, valuation issues have become increasingly important for start-up companies. In the past, industry specific start-up “rules of thumb” may have been sufficient to serve as reasonable basis for any valuation concern. For example, the “Silicon Valley Rule” holds that the value of a common share is equal to 1/10 of the value of the preferred share pricing in the most recent capital round. While the simplicity of such rules can be appealing, the scrutiny of the IRS, SEC, and your auditors in combination with the potential liability associated with misreporting financial performance make it critical that value be determined and articulated in a credible fashion."
ARTICLE BY B. PATRICK LYNCH HERE