NZIER was asked by the Horizons Regional Council to estimate the regional macro-economic impacts on farmers and commercial vegetable growers of meeting the nitrogen loss targets in Table 14.2 of the One Plan in three local economies: horticulture in the Horowhenua district, and dairy farmers in the Tararua and Rangitikei1 districts. Horizons Regional Council wants to understand how these estimated direct on-farm/on-orchard costs might affect the wider territorial authority economies, the Horizons economy and the New Zealand economy. We use NZIER's computable general equilibrium (CGE) model of the New Zealand economy to estimate these economic impacts.