This dataset serves as a guide for understanding how the ad valorem tariffs used in TiMBA - a partial economic equilibrium model for the global forest products market were generated and updated based on the WTO's tariff data and. Further, this dataset contains information on forest growing stock data and forest stock growth rates as well as on forest area data and forest area growth rates for 180 countries, as considered in the TiMBA model. The data are essential for modelling scenarios on forest development and trade flows. By following the explanations outlined in the respective Manual (Scenario_input_data_generation_TradeTariffs_Forest_2025), we ensure transparency in mean ad valorem tariff calculations as well as forest growing stock data and annual changes across the countries listed. For any further details, the tariff and forest data can be accessed directly through the provided database sources. Processed data related to forests are provided in the csv files.