If you downloaded the 2023 Instructions for Schedule C (Form 1040) prior to January 26, 2024, please be aware of the following 3 changes: Standard mileage multiplier: On page C-7, under the instructions for line 9, the text has been updated to read: If you take the standard mileage rate: Multiply the number of business miles driven by 0.655. For example, 1,250 business miles driven x 0.655 = $818.75. Filers of Form 1040-SS: On page C-16, under the instructions for line 33, this text has been added: “Line 33 doesn’t apply to filers of Form 1040-SS.” Publication 535 references: All references to Publication 535, Business Expenses, which was retired in 2022, have been replaced with references to other publications or to sections of the Internal Revenue Code, as follows: Page C-7. Under the instructions for line 12, we now reference Pub. 225, chapter 7; and section 57. Page C-8. Under the instructions for lines 16a and 16b, we now reference Pub. 225, chapter 4; and Pub. 551, Uniform Capitalization Rules. Page C-17. Under the instructions for Part V. Other Expenses. Line 48, we now reference Pub. 334, chapter 8; Pub. 225, chapter 4; and section 181.