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The study tests the IPCC's carbon accounting methods for soil organic carbon (SOC) in the Argentinean Pampa Region, finding that a developed Tier 2 (T2) method using the RothC model significantly outperforms the Tier 1 (T1) method. While T1 showed poor performance at both sub-region and county scales, the T2 method demonstrated strong accuracy at the sub-region scale (R2 = 0.85) and improved accuracy at the county scale (R2 = 0.73) when excluding the Flooding Pampa region. The T2 method identified the highest average SOC losses in Central Pampa (35%), Southern Pampa – Eastern (28%), and Rolling Pampa (26%).