I would recommend to not let the deposit exceed more than 10%. However, it’s not unusual for clinics to ask for more, if they do request more, you can counter offer and say you want the deposit to be 10%. Most will be ok, and agree with this.
They usually ask for a deposit when you want to lock down an actual surgery date. You shouldn’t pay a deposit, just to have a consultation, etc… Have you visited the clinics in person, or are your negotiations over email?
Also just FYI:
In terms of a deposit refund policy for cosmetic surgery in Korea. The Korean Consumer Protection Agency has these guidelines.
Depending upon the clinic, they may or may not comply:
– More than 3 days before your surgery, you are entitled to 100% of your deposit
– 3 days before surgery, you are entitled to 90% of your deposit.
– 2 days before surgery, you are entitled to 50% of your deposit.
– 1 day before surgery, you are entitled to 20% of your deposit.
– Canceling on the day of surgery, you forfeit 100% of your deposit.