You can make your own: To make buttermilk, use 1 cup milk and 1 tablespoon lemon juice or white vinegar. Allow it to sit for a few minutes. If you do purchase buttermilk and have extra, freeze it in 1 cup containers or in Ziplock bags. You can also purchase powdered buttermilk in grocery stores.
Straight-line depreciation allows an equal portion of the laptop's cost to be claimed in each year over the total depreciation period. If the cost of the computer was $1,000, for example, then $200 a year can be included in the company's total depreciation amount each year for five years.
The step-up can generate a considerable amount of additional basis and future depreciation, especially if the property was held by the decedent or previous partner for a significant amount of time and is fully depreciated. Many accountants will depreciate the step-up over 27.5 or 39 years. There is a better way.