Most of the contributions to the optimal tax-enforcement literature assume that audits are perfect and always discover evaders. However, evasion often remains undetected. To reduce the probability of such a failure, governments invest resources to improve their tax administrations’ detection...

The progress made by the national government in consolidating its fiscal position between 2002 and 2006 proved unsustainable as its revenue effort started to go down once again in 2007 after a brief improvement in 2005-2007. With the more expansionary stance taken by the government in 2009 as...

The paper examines the VAT gap estimated on the basis of VAT tax returns. The assessment of tax gap dependence is examined based on macroeconomic influences and the measures of the Slovenian fiscal administration. Regarding the latter, the number of audits being performed and the effects of...

The paper is a summary of the exchange of knowledge and experience that took place in the course of the project "Mutual Learning for Reducing Tax Gaps in V4 Countries and Ukraine" co-financed by the Visegrad Fund in the years 2016-2017. Five institutions took part in the project: Center for...

The paper summarizes knowledge on tax gaps in Poland with respect to PIT, CIT, VAT, and excise. An introduction to the Polish tax system is given, trends in tax collect ability and estimates of the tax gaps are discussed, and methods of combating tax evasion and avoidance are reviewed. The paper...

CASE prepared a new study for the European Commission on the VAT Gap in the European Union in 2015. The figures offer an important snapshot of the problems of collecting VAT in the EU and what needs to be done to improve revenues and fight tax fraud. During 2015, the overall VAT that should have...