Brand New by Tomorrow was met with generally favourable reviews from music critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream publications, the album received an average score of 62, based on twelve reviews.[1]
Eddie Fleisher of Alternative Press called the album "a collection of crisp, melodic pop tunes that showcase not only his musical abilities, but his vocal skills as well".[3]AllMusic's John Bush found "Mark's laid-back stride keeps the affair surprisingly buoyant".[2]Tiny Mix Tapes contributor resumed: "Money Mark has a typical singer-songwriter vocal presence, but lighthearted lyrics sprinkled with clever one-liners here and there do a sufficient job".[8] Mark Richardson of Pitchfork called it "a loose, warm, and human-scale record that sounds pretty nice right out of the gate".[6]
In his mixed review for PopMatters, Dan Raper stated: "Brand New by Tomorrow may be great background music, but it isn't anything but that".[7] The melancholy nature of the lyrics about a failed relationship saw comparisons by some critics to Beck's 2002 album Sea Change.