To identify a typical expense on an insurance company's income statement.

The question asks to identify a typical expense on an insurance company's income statement.

Let's analyze each option:

• premium income: This is the revenue an insurance company earns from selling insurance policies. It is an income item, not an expense.
• annuity considerations: These are the payments received by an insurance company for annuity contracts. This is also a form of income or revenue.
• earnings from investments: This represents the income an insurance company generates from its investment portfolio. This is an income item, not an expense.
• benefit payments to customers: These are the payments made by the insurance company to policyholders or beneficiaries for claims, maturities, or other benefits as per the insurance contract. These payments are a major expense for an insurance company.

Therefore, "benefit payments to customers" is a typical expense on an insurance company's income statement.

The final answer is $\text{benefit payments to customers}$