If I purchased an asset for $4000 on March 15th , and the delivery cost related to it was for $150.

The asset has 0 salvage value and will be depreciated over 4 year period.

Also, if the customer keeps the furniture , then its good. But if the customer decides to return the furniture, there is a pick up fee of $100.

what will be the entry to record the purchase of the asset and the subsequent depreciation for the month of March and onwards?

What is my cost basis for depreciation?