The corporation's section 179 depreciation does not appear on IRS Form 1120S, U.S. Income Tax Return for an S Corporation. This is because the Section 179 depreciation is not deducted on the Corporation's 1120S return. It is passed through to the shareholders on IRS Schedule K-1 (1120S), Shareholder’s Share of Income, Deductions, Credits, etc.
Per IRS Instructions for Form 1120S, page 18:
Line 14. Depreciation
Don't include any section 179 expense deduction on this line. This amount isn't deducted by the corporation. Instead, it is passed through to the shareholders in box 11 of Schedule K-1. However, reduce the basis of any asset of the S corporation by the amount of section 179 expense elected by the S corporation, even if a portion of that amount can't be passed through to its shareholders this year and must be carried forward because of limitations at the S corporation level. See Regulations section 1.179-1(f)(2).