Contribution Margin Ratio Drift Review

Review a shifting contribution margin ratio before applying it to a new period. Preparation only, not an account action.

What to provide

Two or more periods of sales, variable costs and the ratio in use.

How it works

1. Compute the ratio for each period.
2. Compare against the ratio in use.
3. Flag a ratio in use that predates a cost or price change.
4. Return the drift review without a forecast claim.

The output

period | sales | variable | ratio | ratio_in_use | drift | forecast_unproved

Worked fictional example

Fictional periods show ratios 0.60 and 0.52 after a cost rise; planning still uses 0.60. On 10,000 planned sales the stale ratio overstates contribution by 800.

Checks and limits

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.

More finance workflows · How-to guides

Method: reviewed source. Demand lead: Oct15 live AIS Search Console: marketing Copilot37 impressions, Planable/Claude45, Planable/ChatGPT24, campaignbrief12, investoragent19, MuseIndia115, cashflowforecasting13. Social calendar/reporting topics follow parent-query leads; other professions follow documented workflow needs, not measured exact intent. Site impressions are not monthly volumes; exact topic volume is unmeasured. Checked October 15, 2026.