Act on the result
Review the largest service-cost layer and confirm its period and cost classification before changing price or delivery scope.
Educational only: Business decision support, not accounting, tax or legal advice.
Privacy: No account is required. Tool inputs and results stay in this browser. Anonymous categorical usage analytics send only governed page, tool, cluster and action identifiers; tool inputs and results are never sent. Error monitoring is disabled. Optional saved state stays only on this device.
Update policy: Reviewed when formulas or official dependencies change.
Scope: Market-neutral small-business planning using your own assumptions.
What this planner helps you decide
Best for
Subscription businesses reconciling a user-defined recurring service-cost stack against revenue.
Outputs
Cost of service, gross contribution and gross margin for one consistent period.
Start here
Enter recurring revenue, then classify hosting, support, third-party, payment and implementation costs consistently.
Use a different tool when: Do not use this to compare two subscription tiers by revenue, usage-linked service cost, support burden and raw contribution rank; use Subscription Pricing Tier Planner for that decision. Use this tool to reconcile recurring revenue with an explicitly classified service-cost stack and inspect gross contribution and margin.
Cash & growth
SaaS Gross Margin: cost of service
Cost of service, gross contribution and gross margin for one consistent period.
Amounts use the same currency as your inputs. No currency conversion is performed.
Subscription economics assumptions
Use one consistent cohort, period, currency and tax basis.
Your numbers stay in this browser
Revenue for the selected recurring period. Use one consistent currency, tax and period basis.
Hosting and infrastructure cost assigned to the period. Use one consistent currency, tax and period basis.
Support cost assigned to serving the period. Use one consistent currency, tax and period basis.
Additional decision inputsOpen the assumptions you are less likely to change on every comparison.
Vendor or service cost tied to delivery. Use one consistent currency, tax and period basis.
Payment-processing cost assigned to the revenue. Use one consistent currency, tax and period basis.
Implementation cost included in the selected service-cost definition. Use one consistent currency, tax and period basis.
Decision result
All outputs come from the registered exact subscription engine.
- Cost of service
- 4,000.00
- Gross contribution
- 6,000.00
- Gross margin
- 60%
| Cost component | Amount |
|---|---|
| Hosting | 1,000.00 |
| Support | 2,000.00 |
| Third-party service | 500.00 |
| Payment fees | 300.00 |
| Implementation service | 200.00 |
| Total cost of service | 4,000.00 |
Scenario comparison
Each row names the assumption axis changed from the baseline.
ScenarioResultDifference
Entered scenario6,000.00Baseline
Lower Support cost6,200.00Not available
Higher Support cost5,800.00Not available
Save these results, change an input, then compare the updated figures with this baseline.
The baseline is temporary in this tab and is not added to shared scenario links or generated reports.
Calculation details
View calculation detailsView the formulas and inputs used for these results.
Cost of service
Cost of service
hosting + support + third-party service + payment fees + implementation4,000.00Result4,000.00
Uses user-entered subscription economics on one consistent cohort, period and currency basis. The engine retains raw precision; display formatting does not feed calculation.
SaaS Gross Margin Planner formulas →Inputs used by these formula steps
- Cost of serviceRecurring Revenue
- 10,000
- Cost of serviceHosting Cost
- 1,000
- Cost of serviceSupport Cost
- 2,000
- Cost of serviceThird Party Service Cost
- 500
- Cost of servicePayment Fees
- 300
- Cost of serviceImplementation Cost
- 200
Gross contribution
Gross contribution
recurring revenue − cost of service6,000.00Result6,000.00
Uses user-entered subscription economics on one consistent cohort, period and currency basis. The engine retains raw precision; display formatting does not feed calculation.
SaaS Gross Margin Planner formulas →Inputs used by these formula steps
- Gross contributionRecurring Revenue
- 10,000
- Gross contributionHosting Cost
- 1,000
- Gross contributionSupport Cost
- 2,000
- Gross contributionThird Party Service Cost
- 500
- Gross contributionPayment Fees
- 300
- Gross contributionImplementation Cost
- 200
Gross margin
Gross margin
gross contribution ÷ recurring revenue0.6 percentResult60%
Uses user-entered subscription economics on one consistent cohort, period and currency basis. The engine retains raw precision; display formatting does not feed calculation.
SaaS Gross Margin Planner formulas →Inputs used by these formula steps
- Gross marginRecurring Revenue
- 10,000
- Gross marginHosting Cost
- 1,000
- Gross marginSupport Cost
- 2,000
- Gross marginThird Party Service Cost
- 500
- Gross marginPayment Fees
- 300
- Gross marginImplementation Cost
- 200
Inputs used
- Recurring revenue
- 10,000
- Hosting cost
- 1,000
- Support cost
- 2,000
- Third-party service cost
- 500
- Payment fees
- 300
- Implementation service cost
- 200
Open this calculator with preset values
This calculator supports documented, shareable scenario URLs. Compatible assistants and applications can construct links using the parameters below.
Scenario links contain only allowlisted numeric and closed-choice inputs shown in the URL; Margin101 excludes free text and identifying fields. Anyone you share the URL with can read those numbers, so do not include private or identifying data.
| Parameter | Meaning | Unit | Allowed values | Presence | Default |
|---|---|---|---|---|---|
| hostingCost | Hosting and infrastructure cost assigned to the period. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 1000 |
| implementationCost | Implementation cost included in the selected service-cost definition. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 200 |
| paymentFees | Payment-processing cost assigned to the revenue. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 300 |
| recurringRevenue | Revenue for the selected recurring period. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 10000 |
| supportCost | Support cost assigned to serving the period. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 2000 |
| thirdPartyServiceCost | Vendor or service cost tied to delivery. Use one consistent currency, tax and period basis. | currency units/selected recurring period | 0 to 10000000 | Required | 500 |
SaaS Gross Margin: cost of service
Use the reconciled cost stack to identify which user-classified service costs consume recurring contribution; it is not an accounting-standard classification.
Formula summary
- Primary formula
- gross contribution = recurring revenue − hosting − support − third-party service − payment fees − implementation cost
Data used here
- The estimate uses your inputs and the general business formula documented in the methodology.
Decision checks
Stress-test the decision
Retest higher support and third-party service costs while keeping revenue and all costs on the same basis.
When this estimate can be misleading
- Cost classification is a user decision; the result is not a claim of accounting-standard gross margin.
- No target margin or industry benchmark is embedded.
- Use one consistent cohort, period, currency and indirect-tax basis.
- This is educational decision support, not financial, tax, legal or accounting advice.
- Use the reconciled cost stack to identify which user-classified service costs consume recurring contribution; it is not an accounting-standard classification.
Educational estimate, not advice. See all assumptions & limitations →
Related reading
Guides to interpret the decision and its assumptions.
- SaaS Unit Economics: Contribution, CAC, Churn and Cash
Connect contribution, acquisition cost, retention and cash timing while keeping cohort and horizon boundaries explicit.
Read guide
Frequently asked questions
How do I reconcile recurring revenue with an explicitly classified service-cost stack and inspect gross contribution and margin?
Review the largest service-cost layer and confirm its period and cost classification before changing price or delivery scope.
Which planning assumptions should I stress-test?
Compare a plausible alternative scenario and verify the decision-critical assumption that changes the plan most.