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18% is correct or if there is another amount it is certainly not 50-85%. I do my wife's taxes and the taxable amount is 85%. She had to contact them, to take out taxes, initially, which they didn't automatically do. Now she has to up it, we found out, because they are still a bit short per month, in deductions.
Please get a Social Security Administration online account, read benefits, taxes, how to and use Q and A links. Make a list of questions to ask. Make contact with a rep, get their name, contact information, ask them what you should know about completing forms whether online or by mail for all information or get the link.