Expected Tracking Performance of the ATLAS Inner Tracker at the HL-LHC

The High-Luminosity LHC (HL-LHC) with its high number of collisions per bunch crossing will present a highly challenging environment to particle detectors. To cope with these conditions, the current Inner Detector of the ATLAS experiment will be replaced with a new all-silicon Inner Tracker (ITk) during the Phase-II upgrade. The latest evolution of the design for this new subdetector is presented and the expected tracking performance evaluated for two possible choices of the pixel sensor pitch. The impact of this performance on vertex reconstruction, jet flavour-tagging and pileup jet rejection is also explored.