Dr_Zinj
Veteran Member
Straight-line depreciation from 100% retail sale value to 25% retail sale value by the end of 15 years. Straight-line from 25% at 15 years to 15% at year 25. Approximately 15% of retail sale value from then on as long as it keeps running until it reached antique age at which time it depends on how many are still around and what the collector demand is.
If someone is putting less than 1200 hrs per year on it, go with the above figures. If someone is putting more than 1200 hrs per year on it; figure on 10% drop per 1200 hrs until it reaches 10 to 15% of retail sale value.
Figures are based on my recollection of replacement criteria for industrial and grounds tractors as outlined in Air Force Technical Order 36A-1-1301 and several years prowling the used tractor sites.
If someone is putting less than 1200 hrs per year on it, go with the above figures. If someone is putting more than 1200 hrs per year on it; figure on 10% drop per 1200 hrs until it reaches 10 to 15% of retail sale value.
Figures are based on my recollection of replacement criteria for industrial and grounds tractors as outlined in Air Force Technical Order 36A-1-1301 and several years prowling the used tractor sites.