Socialist mayoral frontrunner Zohran Mamdani admitted Monday he might need another plan to fund his $10 billion freebie-filled agenda if he can’t score tax hikes on the ultra-wealthy and corporations. Mamdani, during a campaign event on affordability in Queens, repeated that soaking the rich is the “most straightforward and productive way” to pay for free buses, city-owned grocery stores and his other feel-good proposals as questions remain about where the cash would actually come from. But the