Which of the following deductions is allowed from employee checks?

The deduction of insurance premiums from employee checks is permissible because these premiums are often considered a voluntary benefit that employees choose to participate in. When an employer offers health insurance or other types of insurance, they may deduct the employee's share of the premium directly from their wages. This is a common practice, as it simplifies the payment process and ensures that the premiums are paid on time.

Gratuities are generally not deducted from employee checks since they are typically considered tips belonging to employees. Uniform costs may not be deductible if they do not meet specific criteria, such as being required as a condition of employment and not suitable for everyday wear. Similarly, custom tools might be provided by employers rather than deducted from employee wages, as employees should not incur costs for items necessary to perform their job duties.

In summary, the deduction of insurance premiums is a standard practice in employment settings, making it the correct choice in this scenario.