>So to me it sounds like a terrible implementation of a basic income scheme, since someone making X pays no taxes but x+n pays some fraction of n in taxes and p

>So to me it sounds like a terrible implementation of a basic income scheme, since someone making X pays no taxes but x+n pays some fraction of n in taxes and presumably has little real incentive to work for n additional dollars when n is sufficiently small enough that x is close to x+(n - tax). This is true of any tax scheme. NIT/UBI are intended to fix the 'welfare cliff' problem of making significantly less money by earning an extra $1 at certain point of the income curve than at higher ones, by setting a fixed marginal tax rate (even if you're a net recipient of distribution) or guaranteeing a fixed amount to everyone regardless of need, respectively. There is no discontinuity in effective marginal tax rates under NIT.