skills/full-company-analysis/references/modules/M014-working-capital-mechanics.md

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<!-- Module: 014 | Title: Working Capital Mechanics -->

## PART III - ACCOUNTING FOUNDATION | MODULE 014

# Working Capital Mechanics

> Mission. Analyze receivables, inventory, payables, deferred revenue, contract assets, and cash conversion.

## Decision output

Objective: Analyze receivables, inventory, payables, deferred revenue, contract assets, and cash conversion. The completed work product must be reproducible from evidence, show the downstream financial or decision effect when material, state the strongest contrary case, and define a dated update rule.

## Explicit operating procedure

1. Build separate schedules for receivables, inventory, payables, deferred revenue/contract liabilities, contract assets, prepaid/accrued items, and other material operating balances.

1. Calculate DSO, inventory days, DPO, and other turnover measures using average balances and economically matched flow denominators; adjust for seasonality and acquisitions.

1. Explain changes through growth, mix, billing terms, collections, production timing, channel inventory, supplier terms, customer advances, and deliberate cash management.

1. Identify factoring, securitization, supplier finance, reverse factoring, extended terms, and other financing-like arrangements that can flatter operating cash flow.

1. Forecast balances from operating drivers rather than forcing historical percentages when business mix or contract structure is changing.

1. Convert days/turn changes into cash dollars and test whether favorable working-capital release is repeatable or merely pulls cash forward.

## Required evidence and model bridge

- Primary-source set: audited statements, footnotes, accounting policies, roll-forwards, segment disclosures. Preserve exact document/version, date, period, and source location for every material factual input used in working capital mechanics.

- For each key concept - receivables, inventory, payables, deferred revenue, supplier finance, factoring - state whether it is a reported fact, analyst calculation, management claim, external estimate, or judgment. Quantitative concepts must retain raw components and units; qualitative concepts must retain the specific evidence and counterevidence.

- Map only economically relevant findings into the model or decision record. Process-control modules such as working capital mechanics may have no direct valuation line; in that case document the downstream error or governance risk the control prevents.

## Metrics and calculation controls

| Metric / concept | Construction | Required validation |
| --- | --- | --- |
| DSO | DSO = average accounts receivable / revenue x days in period | DSO: Recalculate DSO from cited inputs; reconcile definition, period, units, signs, and source version; investigate and document any variance before use. |
| inventory days | Inventory days = average inventory / COGS x days in period | inventory days: Recalculate inventory days from cited inputs; reconcile definition, period, units, signs, and source version; investigate and document any variance before use. |
| DPO | DPO = average accounts payable / COGS x days in period | DPO: Recalculate DPO from cited inputs; reconcile definition, period, units, signs, and source version; investigate and document any variance before use. |
| cash conversion cycle | Cash conversion cycle = DSO + inventory days - DPO | cash conversion cycle: Recalculate cash conversion cycle from cited inputs; reconcile definition, period, units, signs, and source version; investigate and document any variance before use. |



## Working-capital laboratory

- Forecast receivables from revenue and DSO, inventory from COGS and inventory days, and payables from COGS or purchases and DPO. Use average balances when calculating historical days.

- Convert a five-day DSO deterioration into incremental cash tied up: approximate impact = revenue per day x five days, then refine for seasonality and mix.

- Test whether supplier finance, factoring, securitization, customer advances, or contract assets are shifting cash flows without changing underlying economics.

## Worked application

> Case: CFO jumps because DPO rises after adoption of supplier finance.

- Reconstruct the relevant reported fact from primary evidence before interpreting the case. For working capital mechanics, show the raw components rather than only the resulting ratio or narrative.

- Build the causal chain through receivables, inventory, payables, deferred revenue, then identify which link is directly observed and which link remains an assumption.

- Calculate DSO, inventory days, DPO, cash conversion cycle from sourced components under the reported/base interpretation and at least one skeptical alternative interpretation.

- Translate the difference between cases into the variable that matters for working capital mechanics: evidence quality, revenue, operating profit/NOPAT, free cash flow, invested capital, financing/dilution, risk, or valuation. Mark non-applicable links instead of inventing them.

- Expert consistency test: reconcile working-capital cash flows to balance-sheet changes including M&A, FX, and reclassifications.

- Precommit the specific future filing, KPI, customer/supplier observation, regulator action, or market input that would materially invalidate the working capital mechanics conclusion.

## Failure tests

- FAIL if receivables cannot be defined and reproduced from the source pack.

- FAIL if receivables, inventory, payables, contract assets, or deferred revenue are forecast from a ratio that no longer matches the commercial process or business mix.

- FAIL if the working capital mechanics conclusion depends on an unstated assumption, unreconciled definition, or evidence that cannot be traced to its source/version.

- FAIL if evidence materially inconsistent with the working capital mechanics conclusion is omitted, reclassified, or dismissed without a documented definition, materiality, causal, timing, and source-quality analysis.

## Completion test

A senior reviewer must be able to reproduce the working capital mechanics conclusion, vary the most sensitive assumption independently, trace the change through the model, understand the strongest opposing case, and identify the next evidence that would force an update. If any link is missing, the module remains open.