### Question
How does the law define per-unit retain certificate?


### Answer
Under *26 CFR § 1.61-5*, **per-unit retain certificate** is defined as:

> any capital stock, revolving fund certificate, retain certificate, certificate of indebtedness, letter of advice, or other written notice—

(1) Which is issued to a patron with respect to products marketed for such patron

#### Citation:
  - *26 CFR § 1.61-5*
