Answer:
The amount of social security benefits is taxable to Carl and Karina is $7650.
Step-by-step explanation:
For joint filing return combined income of $32,000 to $44,000 you will pay 50% of your social security income and if you have combined income more than $44,000 you can expect to pay taxes up to 85% of your social security amount.
Social security amount that is taxable = $9,000*85/100
= $7650
Therefore, The amount of social security benefits is taxable to Carl and Karina is $7650.