Define the service before the price
List what must be delivered: supported accounts and formats, approval workflow, live-post verification, reporting, recovery and client handover. A cloud-phone invoice, an agency retainer and an internal engineer’s salary purchase different things. A fair comparison brings each option to the same operating boundary.
Treat vendor promises as requirements to demonstrate. Buying infrastructure does not necessarily buy editing, approvals, monitoring or on-call support. Building software does not automatically provide permission to publish through a platform. TikTok’s official integration workflow remains relevant whichever party writes the code.
Put labor where it actually occurs
The internal option includes initial development and migration, recurring hosting and devices, maintenance, review and exception handling. Loaded labor should include the costs your organization actually attributes to the role. Avoid comparing gross salary with a contractor’s fully loaded invoice without explaining the difference.
The vendor option includes setup, subscription, usage, retained internal coordination and the cost of leaving. Ask how reconnecting accounts, native-only features, failed jobs and support escalations are billed. Do not enter hypothetical fines or lost revenue as certain costs; model them separately if you have defensible assumptions.
Use the horizon, then test the assumptions
The worksheet uses linear monthly costs because its purpose is an inspectable scenario. Internal total equals build hours × rate plus months × monthly internal operating cost. Vendor total equals setup and exit costs plus months × subscription and retained labor. Actual costs can change in steps when you add seats, concurrency or a new engineer.
If internal work requires $6,000 up front and costs $700 a month, while a vendor needs $500 up front and $1,200 a month, the initial $5,500 difference is recovered after 11 months under those assumptions. That is a cost crossover, not a guarantee of business return.
Choose a reversible operating model
Build can fit a genuinely unusual workflow with engineering ownership and a credible maintenance budget. Buy can fit a demonstrated standard workflow with clear exports and service boundaries. A hybrid may keep strategy and approval in-house while purchasing reliable execution. None is universally cheapest.
Pilot reconnecting access, changing an approved asset, investigating a missing post and offboarding one account. Record the elapsed time and people involved. Use the results to revise the labor inputs. If a vendor cannot demonstrate ownership transfer or data export, make that an unresolved requirement rather than hiding it inside a subjective score.
Make the decision reviewable
Document your horizon, currency, quotes, labor assumptions and omitted costs next to the result. Revisit the scenario when workload changes materially. A lower total does not establish equivalent quality; keep delivery evidence and business outcomes beside the financial comparison.
Do not call views alone a return on investment. Revenue attribution, contribution margin and incremental results require their own evidence. This worksheet helps budget a decision; it does not supply a financial forecast.