From the O'Donnell case:
"Both donors and candidates are legally liable for contributions over the limit. But it’s unlikely O’Donnell or her benefactors will be penalized for breaking FEC rules. Contributions over the limit can be refunded or counted toward a different election, and married donors can attribute the money to a spouse.
“Donors are rarely fined for excess contributions and then only if they are hiding the donations from the recipients,” prominent D.C. campaign finance lawyer Jan Witold Baran said. “Campaigns generally are not penalized for isolated contributions over a limit. However, multiple excessive donations may lead to an investigation … Fines could result in such cases.”
O’Donnell is also a prolific local political donor, putting up at least $25,100 for city and state candidates since 2000, New York filings show. Last year she gave a maxed-out $4,950 donation to Mayor de Blasio. In 2006 O’Donnell even gave $1,000 to former Westchester County DA and then Republican state attorney general candidate Jeanine Pirro, now a Fox News host and loyal Trump defender."
It's normally is a slap on the wrist and, sometimes, a fine.
He spent the night every night for eight months in a work release facility.