Yes, when you talk about the "burdened rate" of pay for folks it's 1/4 to 1/3 in addition to what you get paid.
If your company offers a 401(k) match, then that's a percentage. They pick up the other 1/2 of social security (do they pay another 1/2 of medicare as well?) So you could be getting up to an additional 10% right there before a single benefit is paid. Add to that any health, dental, vision, mental health, education reimbursement, etc and it's easy to see that an additional 1/4 to 1/3rd of your salary is paid in benefits or taxes the employer pays on your behalf.
If your company offers a 401(k) match, then that's a percentage. They pick up the other 1/2 of social security (do they pay another 1/2 of medicare as well?) So you could be getting up to an additional 10% right there before a single benefit is paid. Add to that any health, dental, vision, mental health, education reimbursement, etc and it's easy to see that an additional 1/4 to 1/3rd of your salary is paid in benefits or taxes the employer pays on your behalf.