You may use your own invoice to bill the government, but you must make sure that it meets all of the requirements previously discussed. If it doesn't, you will only slow up payment. Sometimes you might find it easier to use a government form. One common form that is used with military contracts is the DD Form 250, Material Inspection and Receiving Report.
The DD Form 250 is basically a material inspection and receiving report (MIRR) that can be used by the government to document contract compliance and by the contractor to submit an invoice. The contractor is responsible for preparing the MIRR, except for entries that an authorized government representative is required to complete. You should contact the office that is administering your contract to get specific help with this form. The appropriate office is identified in the contract. A handy guide for contractors now is available at this site, in the "Commercial Pay" section.
Specifically, this multi-purpose report is used for the following:
- Evidence of government contract quality assurance at origin or destination
- Evidence of acceptance at origin or destination
- Packing lists
- Contractor invoice
- Commercial invoice support