If UBI is paid out through printing extra currency, it will induce inflation.
But if UBI is paid out via extra taxation, then it will not induce inflation (or at least, not overall - it might induce some inflation in goods/services which wouldn't have been in demand but for the UBI, such as low cost labour). The higher taxes taken from the higher income people will reduce their demand, and thus balance out.
But if UBI is paid out via extra taxation, then it will not induce inflation (or at least, not overall - it might induce some inflation in goods/services which wouldn't have been in demand but for the UBI, such as low cost labour). The higher taxes taken from the higher income people will reduce their demand, and thus balance out.