I

1. Identification numbers
2. Impairment-related expenses, medical expenses
3. Improvements:
4. Improvements:   By lessee
5. Improvements:   For disabled and elderly
6. Improvements:   To business assets
7. Income or loss, partner's
8. Income tax
9. Income tax return, who must file
10. Income tax returns
11. Income tax withholding
12. Income tax:   About
13. Income tax:   Deduction for
14. Income tax:   How to pay
15. Income tax:   Underpayment penalty
16. Income taxes
17. Income:
18. Income:   Barter
19. Income:   Bonus
20. Income:   Cancelled lease payments
21. Income:   Dividend
22. Income:   How to account for
23. Income:   Other types
24. Income:   Paid to a third party
25. Income:   Prepaid rent
26. Income:   Rental
27. Incorrect amount of amortization deducted
28. Independent contractor
29. Indian employment credit
30. Indirect ownership of stock
31. Individual retirement arrangements (IRAs)
32. Individual taxpayer identification number
33. Individual taxpayer identification number (ITIN)
34. Information returns
35. Inherited property
36. Innocent spouse relief
37. Installment sales
38. Insurance agent:
39. Insurance agent:   Former
40. Insurance agent:   Retired
41. Insurance policies
42. Insurance, self-employed health
43. Insurance:
44. Insurance:   Capitalized premiums
45. Insurance:   Deductible premiums
46. Insurance:   Expense
47. Insurance:   Nondeductible premiums
48. Insurance:   Proceeds
49. Insurance:   Self-employed individuals
50. Intangible drilling costs
51. Intangible property
52. Intangibles, amortization
53. Interest:
54. Interest:   Allocation of
55. Interest:   Below-market
56. Interest:   Business expense for
57. Interest:   Capitalized
58. Interest:   Carrying charge
59. Interest:   Deductible
60. Interest:   Expense
61. Interest:   Forgone
62. Interest:   Income
63. Interest:   Life insurance policies
64. Interest:   Not deductible
65. Interest:   Refunds of
66. Interest:   When to deduct
67. International organization employee
68. International social security agreements
69. Interview expenses
70. Inventories
71. Inventory items, substantially appreciated
72. Investment credit
73. Involuntary conversion:
74. Involuntary conversion:   Defined
75. Involuntary conversion:   Depreciable property
76. IRA
77. Iron ore
78. IRS mission