- S Corporations
- Safe Harbor
- Salvage Value
- Schedules
- Section (followed by a number)
- Section 1231 Gain or Loss
- Section 1231 Property
- Section 1245
- Section 125 Plan
- Section 1250
- Section 179 Expense Deduction
- Securities
- Seizure
- Self-Employed Individuals
- Self-Employment Income
- Self-Employment Tax
- Separate Maintenance Payments
- Service Business
- Severance Damages
- Shareholder
- Short Sale
- Short-Term Gain or Loss
- Short-term Periodic Payment
- SIMPLE Retirement Plan
- Simplified Employee Pension (SEP)
- Simplified Method
- Single
- Snail Mail
- Social Security and Medicare Taxes Withheld
- Social Security Tips
- Social Security Wages
- Special Needs Child
- Spousal IRA
- Standard Deduction
- Standard Mileage Rate
- State and Local Income Tax Withheld
- Statements
- Statutory Employee
- Stock Dividend
- Stock in Trade
- Stock Split
- Straddle
- Straight-Line Depreciation
- Student Loan Interest Deduction
- SUB Pay
- Summons
- Support