Alterra was commissioned by the Dutch Ministry of Housing, Spatial Planning and the Environment (VROM) to estimate the additional costs made by nature reserve managers to mitigate the effects of atmospheric deposition. The costs of increasing deposition levels - or the benefits of reducing deposition levels - were calculated from the costs for nature management per Nature Target Type (NTT) for both the current and reduced deposition levels, which result in a similar ecological quality. For the NTTs within the clusters grassland, reed and roughland, and heathland model simulations were run using the models of the `Nature Planner`. For forests and moorland pools a different approach was used. The total amount of money that may be saved because of the reduction of deposition rates is estimated on 42 million euro per year for the period from 2000 till 2020 for the assessed NTTs. The highest savings can be made in grassland; 28 million euro. On average, over a nitrogen deposition reduction from 2312 to 1304 mol per hectare per year, a reduction of one mol per hectare per year can lead to a reduction of costs for nature management of 42 thousand euro per year for the involved NTTs nation-wide.