If you man up to this cafe, you might be asked to pay extra.

A new vegan Australian eatery called Handsome Her is charging guys what it calls a “male tax” to raise awareness on the gender pay gap — and ladies get first choice seating.

“Men will be charged an 18% premium,” a chalkboard outside the Aussie storefront spells out the rules.

The 18% represents how much lower the average Australian woman’s salary was in 2016.

The cafe serves up pastries like lemon slices and carrot cake with side of feminism — a “Wall of Dames” features photos of some of the most iconic females in history, from former first lady Michelle Obama to Pakistani activist Malala Yousafzai.

An email to Handsome Her has not yet been returned, but apparently some men have been receptive to paying extra for food.

“We’ve had men travel across town to visit us and pay ‘the man tax’ and throw some extra in the donation jar — guys, you’re pretty neat,” the restaurant posted on its Facebook page Sunday.

“Who would have thought one little chalkboard would cause such a stir?”

Well, it's been a hectic couple of days. Who would have thought one little chalkboard would cause such a stir? Notes…

Posted by Handsome Her on Sunday, August 6, 2017

Of course it’s against the law in Australia to discriminate on the basis of sex or gender, but owner Alex  O’Brien told Melbourne website broadsheet.com the “male tax” is implemented only once a month — and is more of a suggestion.

“Men are asked if they want to pay the charge before actually being charged,” she explained to Broadsheet.

“We’ve had this pay discrepancy for decades and decades, and we’re bringing it to the forefront of people’s minds. I like that it is making men stop question their privilege a little bit,” she added.

While many ladies posted positively about the cafe rule on social media, plenty lashed out against the feminist rules.

“Not a fan. Whilst appreciate highlight the issue of pay, creating an us and them is divisive. Flip this, and Twitter is up in flames,” one woman tweeted.

Another male user said it “sounds like man-hating more than anything.”

Despite some of the hate one male allegedly donated $50 in support, according to Broadsheet.

In the US, the size of pay gap varies despite the Equal Pay Act. On average, a woman earns 21% less than her male counterpart, according to data from the Census Bureau.