Explanation:

- Income sheet: This is often used by companies, not governments, and reflects profits and losses over time.

- Plan: It refers to a blueprint or strategy for achieving certain goals but isn't specifically for financials.

- Account: Often refers to records of financial transactions, not necessarily an estimation of future ones.

- Budget: This is the correct term for an annual statement of estimated receipts and expenditures of a government over a fiscal year. It outlines government's financial objectives.

The correct answer is:

- Option 4 - Budget