A milestone invoice is not the whole project picture
The timing of billing, revenue recognition, work delivered, and cash collection can differ. Reconcile the contract, delivery status, and accounting policy before treating an invoice or deposit as project profit.
Recorded margin can hide unfinished work
A fixed-fee engagement can look profitable before the expensive final stage begins. Compare costs incurred with a realistic estimate of the effort still required, including review, support, and likely rework.
Hiring changes both project economics and cash commitments
Compare employee costs, benefits, tools, supervision, and available capacity with the contractor scope. A quoted hourly rate alone does not establish which staffing model costs less.
Development costs need useful supporting records
Book accounting, tax deductions, and research-credit eligibility are separate questions. Track the activity, location, period, and contractual rights so the appropriate advisor can assess the treatment rather than assuming every engineering cost qualifies.