The TaxSlayer Pro desktop program supports the following Illinois Business forms.
| IL Form 1120 | Corporation Income and Replacement Tax Return |
| IL Form 1120-X | Amended Corporation Income and Replacement Tax Return |
| IL Form 1120-V | Payment Voucher for Corporation Income and Replacement Tax |
| IL Form 1120-X-V | Payment Voucher for Corporation Income and Replacement Tax (Amended) |
| IL Form 1120-ST | Small Business Corporation Replacement Tax Return |
| IL Form 1120ST-X | Amended Small Business Corporation Replacement Tax Return |
| IL Form 1120-ST-V | Payment Voucher for Small Business Corporation Replacement Tax |
| IL Form 1120-ST-X-V | Payment Voucher for Amended Small Business Corporation Replacement Tax |
| IL Form 1065 | Partnership Replacement Tax Return |
| IL Form 1065-X | Amended Partnership Replacement Tax Return |
| IL Form 1065-V | Payment Voucher for Partnership Replacement Tax |
| IL Form 1065-X-V | Payment Voucher for Amended Partnership Replacement Tax |
| IL Form 1041 | Fiduciary Income and Replacement Tax Return |
| IL Form 1041-X | Amended Fiduciary Income and Replacement Tax Return |
| IL Form 1041-V | Payment Voucher for Fiduciary Income and Replacement Tax |
| IL Form 1041-X-V | Payment Voucher for Amended Fiduciary Income and Replacement Tax |
| IL Form 1041 Sch. NR | Nonresident Computation of Fiduciary Income |
| IL Schedule D | Beneficiary Information |
| IL Schedule NB | Nonbusiness Income for Forms IL-1120, IL-1120-ST, or IL-1065. |
| IL Schedule NLD | Illinois Net Loss Deduction |
| IL Schedule K-1-T | Beneficiary’s Share of Income and Deductions |
| IL Schedule K-1-P | Partner’s or Shareholder’s Share of Income, Deductions, Credits, and Recapture |
| IL Form 4562 | Special Depreciation |
| IL Schedule B | Partners’ or Shareholders’ Information |
| IL Schedule M | Other Additions and Subtractions (for businesses) Forms IL-1120, IL-1120-ST, IL-1065, or IL-1041. |
| IL Schedule 1299-A | Tax Subtractions and Credits (for partnerships and S corporations) |
| IL Schedule 1299-B | River Edge Redevelopment Zone or Foreign Trade Zone (or sub-zone) Subtractions (for corporations and fiduciaries) |
| IL Schedule 1299-D | Income Tax Credits (for corporations and fiduciaries) |
| IL Form 2220 | Computation of Penalties for Businesses |
| IL Schedule K-1-P(3) | Pass-through Withholding Calculation for Nonresident Members for Forms IL-1065 and IL-1120-ST. |
Additional Information: