What is backup withholding?
In some circumstances, federal law requires us to withhold and pay to the IRS a percentage of the interest that is earned on funds in your accounts. This is known as backup withholding. We will not have to withhold interest payments when you open your account if you certify your taxpayer identification number (TIN) and certify that you are not subject to withholding due to underreporting interest. (There are special rules if you do not have a TIN but have applied for one, if you are a foreign person, or if you are exempt from the reporting requirements.) We may subsequently be required to begin backup withholding if the IRS informs us that you supplied an incorrect TIN or that you underreported your interest income.