Here is a direct quote from the instructions for SC Form I-385:
Trade-in or total-loss vehicle: A taxpayer who trades in or totals an eligible vehicle (Vehicle A) and replaces it with another eligible vehicle (Vehicle B) can combine Vehicles A and B as one vehicle equivalent when computing the credit. Check the appropriate box to indicate that the vehicle replaced a trade-in or totaled vehicle. Enter the combined preventative maintenance costs and gallons purchased for Vehicles A and B in the Vehicle 1 column. If you have another qualifying vehicle, report it in the Vehicle 2 column.
In your case, you do not need to indicate that your vehicle is replacing a trade-in or totaled vehicle since you had the same vehicle all year in 2021. It was not traded in 2021.
With regard to the second check-box, here are the instructions:
Sole proprietorship or disregarded limited liability company (LLC): If a vehicle is registered in the name of a sole proprietorship, the individual owner can claim the vehicle as one of their qualifying vehicles for the credit. If a vehicle is registered in the name of a disregarded single-member LLC, the individual, partnership, or corporate owner can claim the vehicle as one of their qualifying vehicles for the credit. 3 The owner may still only claim two total vehicles for the credit. The sole proprietorship or single-member LLC should not file an I-385 claiming the credit.
Since your vehicle is registered in your name and not a company name, this check-box does not apply to you.
To learn more, here is a link to the actual SC I-385 form and instructions: SC I-385
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