# COMAR Title 21 — State Procurement Regulations

## Subtitle 06 — Contract Formation and Award

### Chapter 09 — Invoicing, Payment, and Interest on Late Payments

#### Regulation .02 Required Invoice Documentation.

*COMAR 21.06.09.02*

A Proper invoice, required as payment documentation, must include the following information, without error:

A. The contractor’s federal employer’s identification number or Social Security number;

B. The procurement contract or purchase order number or another adequate description of the procurement contract; and

C. Any documentation required by regulation or the procurement contract.