A Statement of Use is a declaration filed after your initial trademark application showing use in interestate commerce. One of the primary requirements for trademark registration is that a mark is used in interstate commerce–meaning sales accross state lines. However, in contrast to other countries, the USPTO, has a special exception where trademark applicants can file under “intent to use” to preserve the rights to a name they are not currently using in commerce. There are, however, two caveats applicants must be aware of: (1) the filer has six months to use the mark from time the USPTO issues a “notice of allowance” (this time can be extended up to three years), and (2) there is a filing fee associated with filing the Statement of Use (or extension) (this fee depends on the number of classes in which you are using your mark).