Invest in Space Now Act of 2003

Invest in Space Now Act of 2003 - Amends the Internal Revenue Code to allow a credit for the purchase of space transportation vehicle provider stock (as defined by this Act). Sets forth separate credit limitations for large and small capitalization providers, as well as aggregate annual limitations. Directs the Secretary of Transportation to carry out a United States Commercial Space Transportation Vehicle Industry Authorization Program to provide tax credit eligibility to support qualified commercial space transportation vehicle development startup ventures.