When an estate contains stock in a closely held business interest, it is essential to have a professional valuation that uses recognized and accepted methods. The IRS often challenges these values — and the underlying methods must be able to withstand scrutiny from auditors and the courts. In one case, a decedent's shares in a bank holding company were valued at $50 a share on the estate tax return, yet IRS auditors determined the value to be $320 per share. Click "Full Article" to find out how the Tax Court ruled.