A tsunami of child sex-abuse lawsuits filed by former New York City students is expected to hit this year — and some will cost taxpayers millions.

Mark Taylor, 52, charges that Irwin B. Goldberg, a former teacher and dean at Adlai Stevenson HS in Soundview, The Bronx, forced him into oral and anal sex starting when he was 15.

The assaults occurred between 1981 and 1984 and took place in the dean’s office, empty classrooms and Goldberg’s mother’s apartment, investigators say.

“It was before #MeToo. It was before Time’s Up. And nobody cared,” Taylor told The Post.

Nearly 40 years later, Taylor will sue the city Department of Education for damages — armed with shocking videotapes showing Goldberg confessed to his horrific acts and exposed himself in a bid for sex.

“I have proof,” Taylor said.

The Child Victims Act, signed by Gov. Cuomo on Feb. 14, raised the statute of limitations from age 23 to 55 for child sex-abuse lawsuits. It also opens a one-year window for suits no matter how long ago the abuse occurred.

Now religious institutions and school districts are bracing for a wave of suits, with Taylor’s among those leading the charge.

Taylor said that, suffering from post-traumatic stress disorder, he went to police in late 2000, at age 34, to report Goldberg, who was still teaching.

Then-Special Commissioner of Investigation Edward Stancik set up a sting, sending Taylor to visit Goldberg at Adlai Stevenson wearing a hidden camera and tape recorder in his necktie.

On the first visit, Goldberg referenced a past sex act on the student, according to Stancik’s Jan. 1, 2001, report.

Goldberg also “pulled out his penis and implored” Taylor to “just taste it” in a school corridor, the report says.

On two other visits, Goldberg allegedly tried to arrange hookups with Taylor and confided that he had not “fooled around with kids” for a decade.

“There’s been so much publicity about problems with teachers and students … I would be scared to do it now,” he said, according to the report.

The report confirmed Taylor had complained about Goldberg to a teacher, Steven Shapiro, who “kept the information to himself because he did not trust the school’s administration.”

Goldberg ducked termination by retiring in 2001. He now collects a $52,777 city pension.

Shapiro, who became an assistant principal at Stuyesant HS in lower Manhattan, retired in 2002 with a $74,829 pension.

“Luckily, Mark was strong enough to go back to that school and confront Goldberg,” said lawyer Darren Epstein, who represents Taylor with Kevin Mulhearn.

In a similar case, lawyer Jeff Herman represents a former student at JHS 226 in Ozone Park, Queens. Now 53, the ex-student charges that a teacher, Edward Huckemeyer, had him inhale chemical fumes and performed oral sex on him at age 13.

The ex-student came forward in 1994. Stancik sent him to visit Huckemeyer, then a principal at PS 71 in Ridgewood, Queens, wearing a hidden tape recorder.

“I know that what occurred was wrong,” Huckemeyer said on tape, according to a report.

Huckemeyer, a Catholic deacon, was named last month among 100-plus clergy members the Brooklyn Diocese believe molested minors. He retired from the DOE in 1996 and collects a $65,245 city pension.

Goldberg, Shapiro and Huckemeyer could not be reached.