Corporate sign on bonuses are often much higher than bonuses for privately owned clinics. They also vary a lot from state to state.
One thing to consider when faced with these huge sign on bonuses is there’s usually an agreement/requirement to stay for a certain length of time or else you have to pay the bonus back partially or fully. Which is reasonable, but sucks because you have to pay back the whole pre-tax amount (in your example 50,000) when you had to pay taxes on it and actually only received 30,000 after taxes. Read the fine print. It can trap you in if you decide the clinic isn’t a fit after 6 months and you accepted a giant bonus you now can’t repay. There’s often a reason why bonuses are exorbitant.., they’re desperate. I’d rather negotiate a higher salary and lower bonus if possible. My position (not in GP or even clinical practice at all, I’m in pathology) had a $10,000 bonus. My company is offering an additional $20,000 for one location because no one wants to go there.