A Long Island nonprofit hosted and promoted a fundraiser for a Democratic state lawmaker's campaign — a move that appears to violate federal laws for tax-exempt entities, The Post has learned.

Registered 501(c)(3) Long Island Youth Development Inc. held an Oct. 3 event for Assemblywoman Rebecca Kassay (D-Suffolk County), according to a social media post that urged its followers to "do all we can to support her and care for our communities."

"Join us as we hold a reception to celebrate the contributions Assemblywoman Rebecca Kassay has had to the Long Island Youth Development organization and the asian community on Long Island," the post read.

The nonprofit, headed by Dr. Yanping Yu, made the post as the Democrat secured a large state grant for the organization.

A flyer with the post includes Kassay’s campaign logo and says “donations appreciated but not required.” It lists ticket prices starting at $50 up to $500 and includes a link to a page to donate to Kassay’s campaign as well as a campaign email.

"Thanks to New York State's public financing program, in-district donations can be matched up to 12 times!"

Kassay is also taking advantage of the state’s campaign matching program , meaning donations under $50 can trigger up to a matching $600 from state coffers.

The flyer asks attendees to please join a reception with Yu and Suffolk County lawmaker Jonathan Kornreich.

Nonprofits are strictly prohibited from political activity such as soliciting contributions for or on behalf of a political candidate. A 501(c)(3) can face revocation of its tax exempt status or fines if it violates the Internal Revenue Code.

“It’s clearly participating in a campaign, which is prohibited activity for a 501(c)(3),” Patrick Sternal, counsel at Holtzman-Vogel, told The Post.

Yu herself has donated $2,500 to Kassay since September 2025, and the Assembly member has appeared at several events for her nonprofit, according to her social media accounts.

Kassay has also recognized Yu with official proclamations and honors such as a “women of distinction” award and naming her a “women’s history month honoree.” Posts show the two together in Albany earlier this year.

IRS records for Yu’s nonprofit raised more questions about how its funds are managed.

Long Island Youth Development reported raising $13,827 at fundraising events, despite spending more than $15,034 to host them, between June 2025 and May 2026, according to its 990 filings with the federal government.

The org also spent $12,822 on an event hosted by the Long Island Chinese Society, another group headed by Yu that hosted an inaugural event with Kassay and Kornreich in January, the records showed.