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A precise determination of the ground state $^{111}$In ($9/2^+$) electroncapture to ground state of $^{111}$Cd ($1/2^+$) $Q$ value has been performedutilizing the double Penning trap mass spectrometer, JYFLTRAP. A value of857.63(17) keV was obtained, which is nearly a factor of 20 more precise thanthe value extracted from the Atomic Mass Evaluation 2020 (AME2020). Thehigh-precision electron-capture $Q$ value measurement along with the nuclearenergy level data of 866.60(6) keV, 864.8(3) keV, 855.6(10) keV, and 853.94(7)keV for $^{111}$Cd was used to determine whether the four states areenergetically allowed for a potential ultra-low $Q$-value $\beta^{}$ decay orelectron-capture decay. Our results confirm that the excited states of866.60(6) keV with spin-parity ($J^\pi$) of 3/2$^{+}$ and 864.8(3) keV with$J^\pi$ = 3/2$^{+}$ are ruled out due to their deduced electron-capture $Q$value being smaller than 0 keV at the level of around 20$\sigma$ and50$\sigma$, respectively. Electron-capture decays to the excited states at853.94(7) keV ($J^\pi$ = 7/2$^+$) and 855.6(10) keV ($J^\pi$ = 3/2$^+$), areenergetically allowed with $Q$ values of 3.69(19) keV and 2.0(10) keV,respectively. The allowed decay transition $^{111}$In (9/2$^{+}$) $\rightarrow$$^{111}$Cd (7/2$^{+}$), with a $Q$ value of 3.69(19) keV, is a potential a newcandidate for neutrino-mass measurements by future EC experiments featuring newpowerful detection technologies. The results show that the indium level$2p_{1/2}$ for this decay branch leads to a significant increase in the numberof EC events in the energy region sensitive to the electron neutrino mass.

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination