OID. A discount from par value of a bond or debt-like instrument. In structuring a private equity transaction, the use of a preferred stock with liquidation preference or other clauses that guarantee a fixed payment in the future can potentially create adverse tax consequences. The IRS views this cash flow stream as, in essence, a zero coupon bond upon which tax payments are due yearly based on "phantom income" imputed from the difference between the original investment and "guaranteed" eventual payout. Although complex, the solution is to include enough clauses in the investment agreements to create the possibility of a material change in the cash flows of owners of the preferred stock under different scenarios of events such as a buyout, dissolution or IPO.