Backing out of curbside parking a truck came from alley and we hit so at fault if i have no damage but he has smashed front right panel?

Determining fault in a car accident isn't solely based on the extent of damage to the vehicles. It's essential to consider the circumstances and actions leading up to the incident. Since you were backing out of curbside parking, it's possible you may be partially or entirely at fault for the collision. Here's a breakdown of potential scenarios:

1. If you failed to check properly before reversing and the truck had the right of way, you could be held responsible.

2. If the truck driver was speeding in the alley and didn't give way to your reversing maneuver, they could be at fault.

3. It could also be a shared fault situation, where both parties may be considered negligent in some way.

In summary, assessing fault requires a comprehensive investigation of the accident, considering factors like your respective positions on the road, adherence to traffic laws, visibility, and any contributing circumstances. It's advisable to gather evidence, such as photos of the scene and any witnesses' information, and consult with your insurance company or a legal professional to determine your rights and potential liabilities.