Nearly 60% of contractors don't accurately track job costs, leading to profit margins 15-25% lower than they should be. Unlike new construction, service work involves emergency calls, unpredictable repairs, and constantly changing conditions that make accurate job costing both critical and difficult. Your billing model, Time & Materials (T&M) or Fixed Bid fundamentally changes how you track costs, recognize revenue, and protect your margins. Get this wrong, and profits leak a