Build a first-year ecommerce budget that separates one-time setup, recurring operations, transaction-linked cost, and contingency.
Separate four cost behaviors
List one-time setup costs such as design, photography, migration, legal review, and initial integrations. List monthly costs such as the platform, apps, email, support, bookkeeping, and maintenance. Model variable costs such as payment processing, marketplace fees, shipping, packaging, returns, and chargebacks against an expected sales range. Finally, create a contingency for rework and delayed launch. Do not hide owner labor: estimate the hours required for catalog maintenance, fulfillment exceptions, customer support, reporting, and updates.
Build three operating scenarios
Create conservative, expected, and high-volume cases using the same definitions. Change order count, average order value, return rate, support hours, and paid acquisition rather than changing every assumption at once. Include at least twelve months of recurring expenses, consistent with the SBA approach to startup cost planning. The conservative case should show how long the business can operate before sales become reliable; the high-volume case should reveal systems or labor that become expensive as orders grow.
Calculate contribution before break-even
For each order, subtract product cost, payment charges, packaging, shipping subsidy, expected returns, marketplace or affiliate fees, and other volume-linked costs from revenue. The remaining contribution pays fixed operating expenses. A simple unit break-even estimate divides fixed costs by selling price minus variable cost per unit. Use this as a planning signal, not a promise: product mix, taxes, discounting, and returns can change the result. Record every source and date so assumptions can be refreshed.
Compare platforms on total operating cost
Run the same catalog, sales volume, payment mix, staff count, and required workflow through every platform estimate. Include paid apps, custom work, premium themes, migration, maintenance, support, exports, and the expected cost of switching later. A lower subscription may cost more if staff repeatedly repair imports or copy data between systems. Require renewal pricing and written scope from providers, then revisit the plan monthly after launch using actual payment, shipping, return, and labor data.
Completion controls
- One-time and monthly costs separated
- Variable cost modeled per order
- Owner and staff labor included
- Three sales scenarios retained
- Break-even assumptions dated
- Renewal and migration costs recorded
Put the guide to work
Official sources
Sources support the operating controls described above. Provider requirements and public rules can change; verify the current source before acting.