he key factor influencing the tax revenue forecastingerror (BI) is the economic situation, which can becharacterised by three major indicators: GDP growthrate, inflation rate and unemployment rate. While dataon the former two are available only nationally, theunemployment rate is available for individual municipalities with extended scope. Higher economic growthin the current year (GDP) results in higher actualrevenues (i.e., BI decreases). Higher inflation (INFL)means higher actual nominal revenues (i.e., BI decreases). Higher unemployment (UNEMPL) results inlower tax collections due to both lower incomes andlower consumption (i.e., BI grows). This relationshipwas confirmed by Chatagny and Soguel (2012) in thecase of Swiss cantons. Owing to the revenue-sharingmechanism, the differences in the unemployment rateamong municipalities have only a limited impact;however, we can perceive it as a proxy for the characteristics of the economic situation in the particularmunicipality as it can indirectly impact the activity ofself-employed and thus the share of the individualincome tax paid by the self-employed. To sum up,improved economic conditions increase the underestimation of tax revenue forecast
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