Call it an Obama tax.

The Morningside Heights apartment where President Obama crashed as a student is back on the market — with a $550 rent increase.

The third-floor, two-bedroom walk-up on West 109th Street that Obama shared with a roommate in 1981 when he was a junior at Columbia University is available Aug. 1 for $2,400.

Realtor Zak Kneider admits at least $200 of the increase is an attempt to cash in on the president’s cachet.

“Similar apartments in the building would be around $2,200,” Kneider said. “Believe it or not, people will want to live in an apartment where the president or a celebrity once lived. But it isn’t that overpriced. Still, we are definitely playing that angle.”