I’ve been working for a while on the idea of Universal Basic Income (UBI), and the closely related alternative of a Guaranteed Basic Income (GBI), in which the payment is phased out as income increases. I’ve now developed a very simple model to illustrate some of the crucial points. Here are three observations. Only Observation 2 requires the model, and the assumption that the distribution of income is broadly similar to that prevailing in Australia today.
Observation 1: Any UBI scheme can be replicated by a GBI with the same effective marginal tax rates, and vice versa
Observation 2: A GBI equal to 40 per cent of average income, with a phaseout rate of 40 per cent, would require additional transfer payments equal to between 8 and 10 per cent of national income.
Observation 3: A UBI equal to 40 per cent of average income, with no phaseout, would require additional transfer payments equal around 30 per cent of national income, but would have the same effective marginal tax rates as a GBI.