Start by defining the IT services you want to allocate—infrastructure support, application development, help desk, and so on. Then capture how IT employees actually spend their time against those service categories. The most common mistake is relying on headcount ratios or manager estimates instead of verified time data. ClickTime captures labor hours at the point of entry, tied to pre-defined cost codes, so your chargeback model reflects where IT labor actually goes rather than where leadership assumes it goes.