Telecommunications Development Fund Improvement Act of 2003

Telecommunications Development Fund Improvement Act of 2003 - Amends the Communications Act of 1934 to require any down payment that the Federal Communications Commission (FCC) may require any bidder to submit before issuance of a station license or construction permit in a system of competitive bidding to be deposited in an interest-bearing account at a financial institution designated by the FCC. Requires, within 45 days following the issuance of such a license or permit: (1) the down payments of successful bidders to be paid to the Treasury; and (2) the interest accrued to the account to be transferred to the Telecommunications Development Fund.

Makes this Act inapplicable to down payments of any successful bidder in the FCC's C and F block broadband personal communications service spectrum auction (known as auction 35) or related claims.