Inherited Assets Tax Basis Guide

I've inherited assets and need to understand the tax implications.

Inherited assets:
- Relationship to deceased: [Spouse/Parent/Other]
- Type of assets inherited:
  - Real estate: [Yes/No - Value at death]
  - Stocks/investments: [Yes/No - Value at death]
  - Retirement accounts: [Yes/No - Type and value]
  - Business interest: [Yes/No - Value]
  - Other assets: [Describe]
- Date of death: [Date]
- Was an estate return filed: [Yes/No]
- Estate tax paid: [Yes/No]
- Plan to sell inherited assets: [Yes/No - When]
- Inherited from spouse: [Yes/No]
- Community property state: [Yes/No]

Please explain:
1. Stepped-up basis rules and how they work
2. How to determine fair market value at death
3. Alternate valuation date option
4. Special rules for surviving spouses
5. Community property basis rules
6. Inherited retirement account rules (RMDs)
7. Carryover basis exceptions
8. Reporting sale of inherited assets
9. Estate income vs. inheritance
10. State inheritance/estate tax considerations