(a) Exclusion

Except as provided in subsection (b), gross income does not include interest on any State or local bond.

(b) Exceptions

Subsection (a) shall not apply to—

(1) Private activity bond which is not a qualified bond

Any private activity bond which is not a qualified bond (within the meaning of section 141).

(2) Arbitrage bond

Any arbitrage bond (within the meaning of section 148).

(3) Bond not in registered form, etc.

Any bond unless such bond meets the applicable requirements of section 149.

(c) Definitions

For purposes of this section and part IV—

(1) State or local bond

The term “State or local bond” means an obligation of a State or political subdivision thereof.

(2) State

The term “State” includes the District of Columbia and any possession of the United States.