Tim Donnelly | New York Post

If you’re looking for brutally honest business advice, KISS frontman Gene Simmons is here to give you a tongue lashing.

The legendary rocker, known for his elaborate stage makeup, costume and a proclivity for wagging his long tongue, is releasing a new book of business advice on Tuesday, called “Me, Inc.: Build an Army of One, Unleash Your Inner Rock God, Win in Life and Business.” In it, he distills 40 years of leading the global-phenomenon rock band, which has franchised into a billion pieces of merchandise, including everything from comic books to a coffee shop.

We combed through the book to find the 10 best pieces of advice from the brain of Gene Simmons.

Simmons writes about how when he was 9 years old and living in Williamsburg, Brooklyn, he attended yeshiva six days a week and spent all his free time in the library.

“For the first time in my life, I was in a place where the poorest of the poor and the richest of the rich have the same access to all information for free, on a level playing field,” he writes.

It was then that he promised himself, “I would educate myself, and that I would never stop educating myself. It was my responsibility to keep learning.”

Don’t put all your eggs in one rock ’n’ roll basket

“I seemed instinctively to know certain precepts of good business practice,” he writes.

“I wanted to try for a career in the music industry, otherwise known as forming a rock band. But there was no guarantee it would work. In fact, statistics should have been enough to tell me the cards were stacked against me. So I worked at two jobs at the same time I was trying to put together the band.”

He worked at a deli, and the Puerto Rican InterAgency Council. By the time KISS started, he had saved $23,000. Shortly after, he was able to quit the jobs and spend most of his time on the band.

“‘Don’t quit your day job’ is often good advice, unless you can afford to do otherwise,” he says in the book.

“If you can afford it, don’t borrow,” he writes. “Pay for it yourself.”

Simmons writes about needing a sound system in the early ’70s when the band was getting moving. He and KISS co-founder Paul Stanley bought a soundboard and speakers and had friends build the sound system cabinets. It was cheaper, and he and Paul paid for all of it.

Get paid for what you do

Simmons says an original agreement that split band income between all members was a mistake: “Even though we shared our writer/publisher royalties equally with Ace [Frehley] and Peter [Criss], this hardly seemed to inspire them to give their all to the band.”

It led to more dysfunction in the band, so two years later he renegotiated how the money was divided — with Paul and Simmons getting a larger chunk.

Simmons spends an entire chapter talking about all the various jobs he’s had — co-founding an arena football team, doing speaking engagements, producing movies, starting restaurants, publishing a magazine and opening horse racing tracks, to name a few — while also listing how unqualified he was to take on all of those jobs.

“‘Getting it’ has to do with a mind-set: the idea that you can do almost anything, given the right place, the right time and the right thing. And plain old hard work,” he writes. “This is the reason I don’t use notes [in speaking engagements] — because I didn’t use notes in my career. Sink or swim, you have to jump into the deep end. If you wait until you are ready, as the saying goes, you will wait forever.”

Learn from the masters

Simmons is a bit of a Steve Jobs fanboy. He talks about how Jobs got booted from Apple only to return victoriously to the company and lead it to become a worldwide innovator. Simmons wants his readers to surround themselves with people like Jobs.

“Maybe you shouldn’t get married or have children for a long time,” he writes. “Maybe you shouldn’t waste your time hanging out with your friends who do nothing. Maybe you should be hanging out with people who are brighter and are further up the ladder of success than you are.”

How do you do this? “Pick up the Wall Street Journal every day and read it,” he says.

“You don’t get money for doing nothing. In life, if you don’t work, you don’t make money. Get used to it. DON’T TAKE VACATIONS,” Simmons writes (he shouts his advice through a lot of capitalization in the book). He even claims to have never taken a vacation.

To him, weekends and two weeks off for vacation a year “spells ‘loser.’ ”

Ditch the suburbs

“If you don’t live in a big city, move to one now. Period. There are more job opportunities in a big city than there are in a small town,” he writes, while also extolling the better doctors, relatively low crime rates and general overall ease of living when it comes to renting and not needing a car.

“There’s nothing wrong with being proud to be Spanish or African-American or Albanian,” he writes, “But that in itself won’t help you amass a fortune in America. And bluntly speaking, English language skills can.”

While noting it’s not the politically correct thing to say, he goes on to implore you to “try to speak English without an accent,” something he says he did when he moved to America from Israel as a boy.

A simple test: “If Siri doesn’t understand you, then you’re in trouble.”

Know when to jump ship

One of his failed projects was Gene Simmons Tongue magazine, which ran for five issues before folding. But even that failure led to new ventures, including a new magazine, some games and comic books.

“You will have a string of failures so consistent that it will seem like the world is working against you. This is normal. Pay it no mind,” he writes. “I fail all the time. It means nothing. But a crucial, learnable skill is having the ability to fail and pick yourself back up.”

How could you not take his advice? Don’t forget he once helped save Santa.