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What a job actually costs, as opposed to what you quoted. Tracking the gap gives the next proposal better evidence.
The single-project sum takes a minute. The version that matters is the roll-up, where a handful of underwater jobs hide inside a perfectly healthy blended number.
The 15% uplift on your proposal has no derivation, so it cannot be defended or released. Price the risks you logged instead, and let the percentage fall out.
Enterprise change control was built for internal IT operations. A delivery partner working to a signed statement of work needs something lighter: raise it, size it, price it, book it.
A fixed price SOW gives you one number and no invoice line to check yourself against. Convert it into a cost ledger, then reconcile actuals every week.
The biggest invoice of your year is rarely your best project. Here is how to adapt client profitability analysis to a licence-heavy IT services cost base.