Layered quantum materials often host multiple nearly degenerate electronic states whose balance is highly sensitive to lattice symmetry and interlayer coupling. $1T-{\mathrm{IrTe}}_2$ is a representative example, where superconductivity emerges in close proximity to a charge-ordered state. Here, we use high pressure as a clean tuning parameter to determine how structural reconstruction reshapes the ground state of single-crystalline $1T-{\mathrm{IrTe}}_2$. Electrical transport measurements reveal that superconductivity disappears abruptly around 4 GPa. High-pressure x-ray diffraction shows that this sudden loss of superconductivity coincides with a first-order transition from the trigonal phase to a monoclinic structure, consistent with the high-pressure Raman measurements. First-principles calculations further indicate that pressure stabilizes the high-pressure monoclinic phase. Together, these results identify pressure-driven structural reconstruction as the key mechanism governing ground-state competition in $1T-{\mathrm{IrTe}}_2$ and establish this material as a platform for exploring how interlayer coupling controls competing orders in layered quantum materials.

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• High-pressure studies
• Pressure effects
• Structural phase transition
• Transition metal dichalcogenides
• Density functional calculations
• Resistivity measurements
• X-ray diffraction