What's the best way to model tax credit?

[qzaus]

Hello! I am thinking of modeling tax credit policies such as tax credit for electric vehicles within the TIMES model. Should I refer to FLO_SUB or FLO_TAX? The difficulty that I encounter is that the tax credit is per vehicle-based, say depending on the battery, for an EV, the highest tax credit is $7500, while in the dataset, I only have the aggregate numbers for all EVs for the country. Should I change the input data of investment cost of EVs then, to model tax credit in a stylized way? Thank you!