(For more information, see our article on disability backpay .). The maximum the disability attorney can charge is 25% of your backpay for his or her services, up to a maximum of $6,000. For example, if your back-dated benefits are calculated to be $10,000, your attorney will be paid $2,500 and you will receive $7,500.For more information, see our article on disability backpay .). The maximum the disability attorney can charge is 25% of your backpay for his or her services, up to a maximum of $6,000. For example, if your back-dated benefits are calculated to be $10,000, your attorney will be paid $2,500 and you will receive $7,500.