If comedians really want to hit Donald Trump where it hurts, they should probably aim for his wallet. According to writer Aaron Lee, who worked on Trump's 2011 Comedy Central roast, the mogul's personal wealth was the only comedic topic deemed off-limits.

"Any joke that suggests Trump is not actually as wealthy as he claims to be" was banned from roasting fodder, Lee writes on List.

These jokes, on the other hand, went over fine with the man who is now the Republican candidate for president:

"ALLOWED: Jokes about Trump's hair
ALLOWED: Jokes about Trump's wife Melania (and his two previous marriages)
ALLOWED: Jokes about Trump having sex with models
ALLOWED: Jokes about the failure of Trump Steaks, Trump Water, Trump Cologne, and other Trump products
ALLOWED: Jokes about Trump's failed casinos
ALLOWED: Jokes about how Trump only became successful thanks to his wealthy father
ALLOWED: Jokes about Trump's weight
ALLOWED: Jokes about Trump being attracted to his daughter Ivanka"

This particular requirement may seem strange if you've managed to avoid the ongoing dispute about Trump's finances. Let me catch you up a bit.

Trump has long touted an image of opulence and bragged about this wealth at campaign events, on social media, and in interviews.

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But he has also repeatedly refused to release his tax returns, leading many to wonder if Trump is actually strapped for cash or saddled with debt.

This is not the only popular theory about Trump's tax-taboo: others have speculated the documents would reveal business ties to the Russian leaders or even the Mob.

When asked why he won't turn them over, Trump has claimed that he cannot because he is currently being audited by the IRS.

This assertion, though long-confirmed false, was recently debunked rather publicly when billionaire Warren Buffett challenged Trump to meet him “any place, any time” to exchange IRS documents.

AP/Nati Harnik - apimages.com

Buffett, a Hillary Clinton supporter, explained that he was also being audited — which does not require you withhold your tax returns from the public. Who knew taxes were so juicy?

As it turns out, every presidential candidate since 1973 has released their tax returns, so Trump's refusal appears more than a little fishy.

This debacle is underscored by the larger sense of confusion surrounding Trump's net worth and financial status.

Though he boasts a net worth of over $10 billion and an income of $557 million, financial experts have questioned the veracity of these numbers due to Trump's tendency to overvalue his own brand and properties, Politico reports.

As of yet, the candidate has shown no signs of unveiling his tax returns, but you are welcome to crack wise about them outside the confines of roasts he is involved in.

On second thought, joke at your own risk?