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Accounting

Core accounting identities, financial-statement measures and ratios used to read a company’s books

Accounting Equation

Basic
Assets=Liabilities+EquityAssets = Liabilities + Equity

The foundation of double-entry bookkeeping: everything a business owns is financed either by debt or by owners’ capital.

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Cost of Goods Sold

Basic
COGS=Opening Inventory+PurchasesClosing InventoryCOGS = Opening\ Inventory + Purchases - Closing\ Inventory

The direct cost of the inventory actually sold during a period.

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Gross Profit

Basic
GP=RevenueCOGSGP = Revenue - COGS

What remains from sales after subtracting the direct cost of the goods sold, before operating expenses.

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Net Income

Basic
NI=RevenueExpensesNI = Revenue - Expenses

The “bottom line” — total earnings after all expenses, interest and taxes are deducted from revenue.

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Retained Earnings

Basic
RE1=RE0+NIDividendsRE_1 = RE_0 + NI - Dividends

Cumulative profit kept in the business rather than paid out to shareholders.

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Current Ratio

Intermediate
CR=Current AssetsCurrent LiabilitiesCR = \dfrac{Current\ Assets}{Current\ Liabilities}

A liquidity measure of whether a firm can cover its short-term obligations with short-term assets.

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Quick Ratio (Acid Test)

Intermediate
QR=Current AssetsInventoryCurrent LiabilitiesQR = \dfrac{Current\ Assets - Inventory}{Current\ Liabilities}

A stricter liquidity test that excludes inventory, which can be slow to convert to cash.

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Working Capital

Intermediate
WC=Current AssetsCurrent LiabilitiesWC = Current\ Assets - Current\ Liabilities

The short-term capital available to run day-to-day operations.

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Debt-to-Equity Ratio

Intermediate
D/E=Total DebtTotal EquityD/E = \dfrac{Total\ Debt}{Total\ Equity}

Measures financial leverage by comparing borrowed funds to owner-supplied funds.

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Inventory Turnover

Intermediate
IT=COGSAverage InventoryIT = \dfrac{COGS}{Average\ Inventory}

How many times inventory is sold and replaced over a period.

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Return on Assets (ROA)

Intermediate
ROA=Net IncomeTotal AssetsROA = \dfrac{Net\ Income}{Total\ Assets}

How efficiently a company turns its assets into profit.

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Return on Equity (ROE)

Intermediate
ROE=Net IncomeShareholder EquityROE = \dfrac{Net\ Income}{Shareholder\ Equity}

The profit generated for each dollar of shareholders’ equity.

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Net Profit Margin

Intermediate
NPM=Net IncomeRevenue×100%NPM = \dfrac{Net\ Income}{Revenue}\times 100\%

The percentage of revenue that survives as profit after all costs.

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EBITDA

Advanced
EBITDA=NI+Interest+Taxes+Depreciation+AmortizationEBITDA = NI + Interest + Taxes + Depreciation + Amortization

Earnings before interest, taxes, depreciation and amortization — a proxy for core operating cash generation.

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Double-Declining Balance

Advanced
D=2n×Book ValueD = \dfrac{2}{n}\times Book\ Value

An accelerated depreciation method charging more expense in an asset’s early years.

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Book Value per Share

Advanced
BVPS=EquityPreferredShares OutstandingBVPS = \dfrac{Equity - Preferred}{Shares\ Outstanding}

The net asset value backing each common share.

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Accounting Equation

Basic
Assets=Liabilities+EquityAssets = Liabilities + Equity

The fundamental balance-sheet identity.

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Net Income

Basic
NI=RevenueExpensesNI = Revenue - Expenses

Profit after all expenses.

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Retained Earnings

Intermediate
RE=RE0+NIDividendsRE = RE_0 + NI - Dividends

Accumulated profit kept in the business.

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Cost of Goods Sold

Intermediate
COGS=Beginning+PurchasesEndingCOGS = Beginning + Purchases - Ending

Direct cost of goods sold in a period.

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Quick Ratio

Intermediate
QR=CurrentAssetsInventoryCurrentLiabilitiesQR = \frac{Current Assets - Inventory}{Current Liabilities}

Stringent liquidity measure excluding inventory.

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Inventory Turnover

Intermediate
IT=COGSAvg InventoryIT = \frac{COGS}{\text{Avg Inventory}}

How many times inventory is sold per period.

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Double Declining Depreciation

Advanced
D=2n×BVD = \frac{2}{n}\times BV

Accelerated depreciation of an asset.

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Book Value

Basic
BV=CostAccumulated DepreciationBV = Cost - \text{Accumulated Depreciation}

Asset value on the balance sheet.

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Operating Margin

Intermediate
OM=Operating IncomeRevenue×100OM = \frac{\text{Operating Income}}{Revenue}\times 100

Profit from core operations as a percent of revenue.

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Contribution Margin

Intermediate
CM=PriceVariable CostCM = Price - \text{Variable Cost}

Revenue per unit left to cover fixed costs.

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