City Comptroller Brad Lander’s damning audit of the Adams administration’s contracts with DocGo suggests the city should recover over $11 million of nearly $14 million paid last year to the controversial migrant-services provider — but why did Lander wait so long to blare the news?

City Hall’s emergency no-bid $432 million DocGo contract wound up spending millions for “shelter” and services that went unused, and with authorizations that went undocumented.

The outrages include charging the city $569,500 to rent out the Crowne Plaza JFK Hotel in Queens for 10 nights, though not a single room was used over that period; in all, taxpayers paid $1.7 million for nearly 10,000 vacant room-nights, earning DocGo $408,680 in commissions in just this two-month period.

And roughly $800,000 in seemingly unauthorized expenses.

The Adams team notes that this was a response to an overwhelming and unprecedented influx of “asylum-seekers” waved in by the Biden-Harris administration — with the city under legal obligation to provide shelter no matter how many showed up on its doorstep.

And it says it cleaned up its act months ago, when Lander’s team first flagged these issues.

Yet it still hasn’t explained why it’s working with DocGo (formally Rapid Reliable Testing NY LLC, since it started off doing entirely different work during COVID) on this stuff in the first place, nor why it’s running the contracts through the Department of Housing Preservation and Development, rather than homeless agencies with long experience on these issues.

Though Nicole Gelinas has been flagging these issues in The Post since last September.

So Lander shouldn’t be too smug about belatedly flagging issues such as “poor fiscal control”: He’s got a whole crew of green-eyeshades types, with statutory power to get at the facts.

Yet he couldn’t start sounding alarms until now, when he is (purely coincidentally!) launching his own mayoral bid?

(Note, too, that Lander opposes key Adams moves to reduce these expenses: He calls the mayor’s 60-day shelter limit for migrants “cruel.”)

The Comptroller’s Office used to be a reliable auditor of city government, and its professional staff surely did fine work here; it’d be nice to get their report straight, not through the prism of Lander’s ambitions.

Above all, New York should step beyond politics to rethink the entire migrant-shelter concept: It’s not only burned billions, but created perverse incentives for even more people to illegally cross the border and come here.

That’s a far larger scandal in its own right.