β-arrestins are known to act as endocytic adaptors by recruiting the clathrin adaptor protein 2 (AP-2) complex to G-protein-coupled receptors (GPCRs), linking them to clathrin-coated pits (CCPs) for internalization. They also act as signaling molecules connecting GPCRs to different downstream effectors. We have previously shown that stimulation of the angiotensin II (Ang II) type 1 receptor (AGTR1, hereafter referred to as AT1R), a member of the GPCR family, promotes the formation of a complex between β-arrestin, the kinase Src and AP-2. Here, we report that formation of such a complex is involved in the AT1R-mediated tyrosine phosphorylation of β2-adaptin, the subunit of AP-2 involved in binding β-arrestin. We identify a crucial tyrosine residue in the ear domain of β2-adaptin and show in vitro that the phosphorylation of this site regulates the interaction between β-arrestin and β2-adaptin. Using fluorescently tagged proteins combined with resonance energy transfer and image cross-correlation spectroscopy approaches, we show in live cells that β2-adaptin phosphorylation is an important regulatory process for the dissociation of β-arrestin–AP-2 complexes in CCPs. Finally, we show that β2-adaptin phosphorylation is involved in the early steps of receptor internalization. Our findings not only unveil β2-adaptin as a new Src target during AT1R internalization, but also support the role of receptor-mediated signaling in the control of clathrin-dependent endocytosis of receptors.