President Donald Trump's tax overhaul could wreak havoc on prenuptial agreements across the country -- and maybe even his own. Prenups often contain provisions about how much a partner would pay in alimony, also known as spousal support. The agreements can be thrown out if judges deem them unfair, signed too quickly or under duress. Now the tax revamp offers another avenue for challenges because courts will likely have to consider how the law has changed since the contracts were created. Starting in 2019, taxpayers will be no longer be able to deduct their alimony payments. For divorcees in the top tax bracket, the change could mean they effectively pay double in post-tax costs compared to what they had previously agreed to in their prenups."We made a deal, and now Congress messed it up," said Linda Ravdin, a partner at law firm Pasternak & Fidis, who's written reference books about premarital agreements.Divorce lawyers are in an awkward position and weighing whether to alert … [Read more...] about Prenups under attack as tax law boosts cost of alimony payments