- S corporation
- Safe harbor
- Sale of loan portfolio
- Sallie Mae
- Savings account
- Savings and loan association (S&L)
- Schedules
- Scholarship
- Schumer Box
- Secondary mortgage market
- Sector
- Secured credit card
- Secured lending
- Security freeze
- Self-directed IRA
- Self-employment tax
- Seller’s agent
- Seller’s market
- Service charge
- Service contract
- Servicer
- Share certificate
- Shared appreciation mortgage
- Signature loan
- Simple interest
- Simple interest loan
- SIMPLE IRA
- Small cap
- Smart card
- Smart contract
- Smishing
- Social Security
- Soft inquiry
- Sovereign loan
- Sovereign wealth fund
- Special assessment
- SR-22
- Standard and Poor’s 500 (S&P 500)
- Standard deduction
- Standard mileage rate
- Starter home
- Statement
- Steering
- Sticker price
- Stock market crash
- Stockbroker
- Strike price
- Student loan
- Subagent
- Subordinated loan