# Operating Leverage Contribution Bridge

Review how a sales change flows to operating income through contribution.

## Scope
Preparation and review only. No account action or professional decision.

## Inputs
Sales, variable costs, fixed costs and the proposed sales change.

## Workflow
1. Compute contribution and the contribution ratio.
2. Apply the sales change to contribution, holding fixed costs constant.
3. Show the operating income change in money and percent.
4. Return the bridge without a forecast claim.

## Output contract
sales | contribution | fixed_costs | change_pct | income_change | income_change_pct | forecast_unproved

## Fictional acceptance test
Fictional sales 1000, variable 400, fixed 500: contribution 600, income 100. A 10% sales rise adds 60 contribution, lifting income to 160, a 60% rise. The sixfold flow-through is arithmetic on these numbers, not a promise.

## Review gates
Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

## Method source
https://corporatefinanceinstitute.com/resources/accounting/contribution-margin-overview/

Checked October 16, 2026. Oct16 live AIS Search Console (sc-domain property, tej@groweasy.ai): 42 clicks, 3.29k impressions, 1.3% CTR, position 14.5, chart Sep 12-Oct 13, last update 6h. Top queries: Muse India 125i, Planable/Claude social agent 45i, marketing Copilot 37i, Planable/ChatGPT 24i, investor agents 19i, Copilot investment-committee 14i, cash flow forecasting 13i, campaign brief 12i. Site impressions are query leads, not monthly volumes; exact topic volume is unmeasured.