SSDI tax withhold ?

I got my SSDI approved last year so it kinda new still but I have a question about the voluntary tax withhold thing so I live in Florida (no state tax) my wife works and makes about 36,000-40,000 yearly and her employer takes taxes out for her like they should I get $2204 a month for me and I get $1100 for my underage son so roughly $3300 monthly and $39k yearly so roughly 75k of yearly income combined!! What percentage should I voluntary withhold from my SSDI to make sure I’m good at end of the year ?? Anybody got knowledge of this and can help please

Options are
7%-10%-12%-22%