What accounting methods, at a minimum, have to bein place to satisfy requirements set by federal, tribal,or state laws or by regulations and guidelines such

1. Accrual Accounting: This is the most basic accounting method required by federal, state, and tribal laws. It records revenues and expenses when they are incurred, regardless of when cash is exchanged.

2. Double-Entry Bookkeeping: This method requires that for every financial transaction, an equal and opposite entry is made to maintain balance in the accounting equation.

3. Use of GAAP: The Generally Accepted Accounting Principles (GAAP) is a set of accounting standards that companies must follow when preparing financial statements. It includes specific guidelines for revenue recognition, expense recognition, and the presentation of financial statements.

4. Regular Audits: Regular financial audits are required to ensure that the accounting methods being used are accurate and in compliance with laws and regulations.

5. Internal Controls: Companies must have internal controls in place to prevent fraud and error. This includes segregation of duties, regular reconciliations, and approval processes for transactions.

6. Reporting: Regular financial reporting is required, often on a quarterly and annual basis. These reports must be made available to shareholders, creditors, and regulatory bodies.

7. Tax Accounting: Companies must also follow tax accounting rules set by the IRS or other tax authorities. This includes the proper calculation and payment of taxes, as well as the preparation and filing of tax returns.

These are the minimum requirements, but depending on the specific laws and regulations of a given jurisdiction, additional accounting methods may be required.