Long Island’s largest LGBT nonprofit is being scrutinized by the state over the way it handles the millions of taxpayer dollars it receives each year, The Post has learned.

A series of questionable bookkeeping moves by the LGBT Network of Long Island — which oversees LI’s Pride Parade and is headed by prominent gay activist David Kilmnick and hubby Robert Vitelli — prompted reviews by the state Department of Health and Office of the State Comptroller, according to the agencies and documents obtained by The Post.

The Network — which doles out everything from condoms to substance-abuse services — is now reining in its hiring and spending, according to employees.

“Literally every single aspect of the organization is being affected — it’s sucking the life out of our ability to do our programming,” a worker railed of the situation.

The Network responded to The Post that “the vast majority of community-based non-profits’’ with state contracts “continually experience cash flow issues because they are required to lay out the funds for services and then seek reimbursement from the state,’’ which can take a year or more.

It added that its financial “strain has been alleviated.”

The Network received nearly $3 million in taxpayer money in 2018, according to its most recent annual report. The funds came from such agencies as the DOH and state Department of Labor.

As with other nonprofits, it requests state grants, and if approved, the public money is then doled out in payments, with the group filing reports at various intervals on how the dough is spent.

The Network ran into problems over those reports, the DOH confirmed to The Post, while the OSC said it uncovered more issues — all of which at least temporarily halted funding.

The Network responded to the issues in a letter — which was obtained by The Post — to the agencies, claiming that it was being brought “to the brink of collapse’’ by the delayed money.

The issues included Kilminick’s failure to report his 2012 marriage to Vitelli, the organization’s chief operation officer, to the IRS and the conflict of interest the relationship could pose, according to the Network’s letter and OSC.

The Network responded to The Post that the couple’s marriage was known to federal, state, county and local officials and was even featured in a two-page story in Newsday in 2012. The Network explained that it promptly amended and refiled the tax forms when the issue was brought to the organization’s attention.

The nonprofit also allegedly failed to disclose bonuses paid to “Executive Management staff” in December 2017 as it battled money woes, according to the OSC and the letter, a claim The Network denies, stating that no such bonuses were paid at that time.

In addition, the OSC questioned a $1,500 bi-weekly “supplemental welfare” payment to Kilmnick on top of his regular salary, according to the letter.

The organization’s most recent financial filing with the government shows that Kilmnick made a total of $184,231 and Vitelli earned $135,000 in fiscal year 2018.

Kilmnick’s “supplemental welfare’’ payment was part of his compensation package, the nonprofit told The Post.

A DOH rep told The Post that it is working with the Network and state comptroller’s office “to improve [the nonprofit’s] billing practices and other financial and administrative procedures” and “continues to review and post payment for approved vouchers submitted by the organization as appropriate” while the “work is ongoing.”

The OSC declined further comment.