The concept of “fiscal illusion” has long existed in public finance, but it is difficult to test. The basic theory is that people will underestimate how much they pay in taxes, as well as underestimate government expenditures. A forthcoming paper in Public Choice by Kaetana Numa uses survey data from the United Kingdom to test the theory, and finds support. From the abstract of “Fiscal illusion at the individual level“:
“providing personalized fiscal information reduces support for higher taxes and spending and increases support for lower taxes and spending. These findings indicate that taxpayers underestimate both their tax liabilities and the costs of public services.”
The paper uses a “novel personalized fiscal calculator” to estimate how much tax an individual would actually owe. It then randomizes which taxpayers get this information, and finds that “the treated respondents… were less supportive of raising taxes and more supportive of cutting taxes than the respondents in the control condition.”
And the results are large. For all taxes, in the treated group that saw their personalized fiscal calculator, 61 percent support cutting taxes, versus just 50 percent in the control group. The differences show up across the major taxes that individuals pay in the UK, including the income tax, national insurance contributions (both employer and employee sides), and the VAT. There is no tax category where the treatment group is more likely to want to increase the tax, though the VAT and the smaller Fuel duty and Council tax are about equal on the percent wanting an increase (but the median response for these last two is to decrease the tax — in both the control and treatment groups).
Do these results from the UK hold up in other developed nations? Possibly. In a 2014 Eurobarometer survey, the percent of EU citizens that could correctly identify their nation’s VAT rate varied widely. The high was 89 percent in Germany correctly identifying the rate, down to 31 percent in Ireland. The average was 65 percent — though the UK was at the low end with only about 47 percent correctly identifying the VAT rate.
Fiscal illusion appears to be a real issue, and probably an important one in the UK.
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