Adding ammendments like minerals or biochar to soils has the potential to induce changes to soil carbon, including by affecting pH or impacting plant or microbial activity. Theoretically, these impacts could increase or decrease soil organic carbon (SOC) storage (i.e. the priming effect). There is relatively little research on these potential interactions to date, and they merit further exploration. Due to the high uncertainty of these potential effects, we recommend this component not be included in the accounting of net carbon removal. If biochar application does increase SOC storage beyond the carbon embodied in the biochar, we recommend that these changes not be used to counterbalance project-related fossil CO₂ emissions nor counted as additional durable carbon removal due to the impermanence of soil carbon storage.