A

Air ambulance, Fixed-wing air ambulance uses.

Aircraft museum, In an Aircraft or Vehicle Owned by an Aircraft Museum (No. 15)

Alcohol fuel credit, Straight alcohol credit.

Annual claims, When to file.

Assistance (see Tax help)

Aviation:

Fuel, Aviation Fuel

Gasoline, Aviation Gasoline

B

Blocked pump, Blocked pump.

Boats, In a Boat Engaged in Commercial Fishing (No. 4)

Buses, In Certain Intercity and Local Buses (No. 5), For Diesel Fuel in a Qualified Local Bus (No. 6), In a School Bus (No. 7)

C

Claims:

Claiming a credit, Claiming a Credit

Claiming a refund, Claiming a Refund

Filing claims, 3. Filing Claims

Comments, Comments and suggestions.

Commercial aviation, In Commercial Aviation (Other Than Foreign Trade)

Commercial fishing, In a Boat Engaged in Commercial Fishing (No. 4)

Credits, Claiming a Credit

D

Diesel fuel, Undyed Diesel Fuel and Undyed Kerosene

E

Excluded liquid, Undyed Diesel Fuel and Undyed Kerosene

Export, Export (No. 3)

F

Farming, On a Farm for Farming Purposes (No. 1)

Farming and state use, Registered ultimate vendor (farming and state use)., Farming and state use.

Fishing, In a Boat Engaged in Commercial Fishing (No. 4)

Foreign trade, In Foreign Trade (No. 9)

Form:

4136, Claiming a Credit

6478, How to claim the credit.

720, Claiming a Refund

8849, Claiming a Refund

Free tax services, 5. How To Get Tax Help

G

Gasohol, Gasoline and Gasohol

Gasohol:

Blender, Gasohol Blending

Blending, Gasohol blender., Gasohol Blending

Gasoline, Gasoline and Gasohol

H

Helicopter, Certain helicopter uses.

Help (see Tax help)

Highway vehicle, Highway vehicle., In a Highway Vehicle Owned by the United States That is Not Used on a Highway (No. 12)

I

Identifying number, Taxpayer identification number.

Income, include in, Including the Credit or Refund in Income

Intercity and local buses, In Certain Intercity and Local Buses (No. 5)

Interest, Interest

K

Kerosene, Undyed Diesel Fuel and Undyed Kerosene

L

Liquefied petroleum gas (LPG), Liquefied Petroleum Gas

M

Military aircraft, In Military Aircraft (No. 16)

More information (see Tax help)

N

Nonprofit educational organization, Exclusive Use by a Nonprofit Educational Organization (No. 13)

O

Off-highway use, Off-Highway Business Use (No. 2)

P

Penalties, Penalties

Publications (see Tax help)

Q

Qualified local bus, For Diesel Fuel in a Qualified Local Bus (No. 6)

R

Records, General Information

Refunds, Claiming a Refund

Registered ultimate vendor, Sales by Registered Ultimate Vendors, Registered ultimate vendor., Registered Ultimate Vendors

S

School bus, In a School Bus (No. 7)

State or local governments, Exclusive Use by a State, Political Subdivision of a State, or the District of Columbia (No. 14)

Suggestions, Comments and suggestions.

T

Tax help, 5. How To Get Tax Help

Taxpayer Advocate, Contacting your Taxpayer Advocate.

Taxpayer identification number, Taxpayer identification number.

Train, Use in a Train

TTY/TDD information, 5. How To Get Tax Help

U

Ultimate purchaser, Ultimate purchaser., Ultimate Purchasers

Used other than as a fuel:

Aviation fuel, For Aviation Fuel Used Other Than as a Fuel (No. 11)

Diesel fuel and kerosene, For Diesel Fuel and Kerosene Used Other Than as a Fuel (No. 8)

Uses, nontaxable:

Aviation fuel, Nontaxable Uses

Aviation gasoline, Nontaxable Uses

Diesel fuel, Nontaxable Uses

Gasohol, Nontaxable Uses

Gasoline, Nontaxable Uses

Kerosene, Nontaxable Uses

Liquefied petroleum gas (LPG), Nontaxable Uses

V

Vendors, registered ultimate, Sales by Registered Ultimate Vendors, Registered ultimate vendor., Registered Ultimate Vendors