Improvements or repairs to assets performed by outside vendors are entered to a fixed asset ID with the use of a voucher as any direct purchase is done. Let's suppose you were performing these same improvements in-house utilizing your own labor force and materials inventory. Increased value of an existing fixed asset could accumulate from either the labor put into the improvements or enhancements from an existing materials inventory. Using the Payroll System, you can charge specific labor amounts and hours to a fixed asset. If you have the Inventory Control System, the cost of inventory items can be transferred to a fixed asset.