“…Compared with existing studies, this paper may have the following innovations: most of the existing literature on digital finance and income distribution discusses the linear relationship between the two, with the majority of such literature being representative [ 3 , 4 , 20 , 21 ], which have explored whether digital financial development is conducive to raising local income levels and whether there is heterogeneity in the extent to which income levels are raised [ 10 , 22 , 23 ]. In contrast, some representative literature advocates another view that the relationship between digital finance development and income distribution may have non-linear characteristics, which is less represented in the literature [ 8 , 10 ], where they use threshold effect analysis to explore whether there is a threshold value for digital finance to be helpful in raising residents’ income, who used threshold effects analysis to explore whether there is a threshold for digital finance to contribute to higher income.…”