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Additionality is one of the principles driving the workings of the Structural Funds. This principle stipulates that contributions from the Structural Funds must not replace public or equivalent structural expenditure by a Member State in the regions concerned by this principle. In other words, the financial allocations from the Structural Funds may not result in a reduction of national structural expenditure in those regions. The principle of additionality is verified for the regions covered by the Convergence Objective.

At the beginning of the programming period the Commission decides the level of expenditure that the Member State will maintain throughout the programming period ('ex-ante' verification). The Commission will verify each Member State's compliance with the principle of additionality at the mid-term of the programming period, in 2011, and after the end of this period, in 2016.

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