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1/ The true cost of ACE may differ, e.g., because equity in tax accounts differs from commercial accounts or because our sample is not representative of the true population of firms in a country. For instance, the true cost of the ACE in Belgium is about 10 percent of CIT revenue, while our estimate suggests 16 percent.  2/The ACE may apply to both corporate and non-corporate firms. To the extent that ACE narrows the base of the PIT of non-corporate firms, our numbers as a percentage of GDP underestimate the cost of the ACE. For Germany, we use a modified number for the CIT-to-GDP ratio to correct for the low degree of incorporation.  Table 3. Estimated Direct Revenue Effect of an ACE

Table 3 1/ The true cost of ACE may differ, e.g., because equity in tax accounts differs from commercial accounts or because our sample is not representative of the true population of firms in a country. For instance, the true cost of the ACE in Belgium is about 10 percent of CIT revenue, while our estimate suggests 16 percent. 2/The ACE may apply to both corporate and non-corporate firms. To the extent that ACE narrows the base of the PIT of non-corporate firms, our numbers as a percentage of GDP underestimate the cost of the ACE. For Germany, we use a modified number for the CIT-to-GDP ratio to correct for the low degree of incorporation. Table 3. Estimated Direct Revenue Effect of an ACE