How long should a W-9 be kept?

A W-9 form should typically be kept for at least four years after the tax return it pertains to has been filed. This retention period aligns with the IRS statute of limitations for audits. However, if the information on the W-9 is relevant for longer, such as for ongoing business relationships, it may be prudent to keep it for a longer duration. Always consult with a tax professional for specific advice tailored to your situation.