Investing Basics

Days Sales Outstanding

Days sales outstanding estimates the average number of days revenue remains tied up in accounts receivable before collection. A common formula divides average receivables by average daily sales.

Updated 2026-09-02 · Foundation

Formula

A common version is:

DSO = Average accounts receivable ÷ Average daily sales

If:

average receivables: $180 million
quarterly sales: $270 million
quarter length: 90 days

average daily sales are:

$3 million

DSO:

60 days

The company carries receivables equal to roughly 60 days of sales.

Equivalent formula

The same relationship can be written as:

DSO = Average receivables ÷ Sales × Days in period

Using the same numbers:

$180M ÷ $270M × 90 = 60 days

The result is identical when the periods match.

DSO and receivables turnover

Receivables turnover expresses collection efficiency as times per period.

DSO expresses it as days.

If annual turnover is 6x:

365 ÷ 6 ≈ 61 days

Higher turnover generally corresponds to lower DSO.

Lower DSO usually improves cash conversion

Suppose DSO falls:

70 days → 50 days

while sales remain stable.

Less cash is tied up in receivables.

That can improve:

operating cash flow
liquidity
borrowing needs

if the change comes from customers paying faster.

Lower DSO can come from stricter terms

Management can shorten customer payment terms.

Receivables fall.

DSO improves.

But stricter terms can also:

reduce sales
hurt customer relationships
push buyers to competitors

Collection speed should be balanced against commercial economics.

Rising DSO can signal collection problems

Possible causes include:

late customer payments
invoice disputes
weak customer finances
billing errors
loose credit standards

If DSO rises while revenue growth slows, the signal becomes more concerning.

Rising DSO can also reflect normal business change

DSO can increase because of:

larger enterprise customers
government contracts
longer negotiated terms
software billing structures
quarter-end sales concentration
acquisitions

The metric shows more days outstanding.

It does not identify the reason.

CDW example

CDW reported DSO of 93 days at June 30, 2026 versus 80 days a year earlier. The company said the increase reflected collection timing and increased sales activity and noted that a shift toward multi-year software purchases can increase unbilled receivables and DSO.^[1]

Higher DSO is not always simply a collection failure.

Definitions can differ materially

CDW includes the current portion of accounts receivable plus specified vendor receivables.^[1]

Dycom includes:

current receivables
non-current receivables
unbilled receivables
current contract assets
net of contract liabilities.^[2]

Donaldson uses average net receivables for the quarter divided by net sales and multiplied by the number of days.^[3]

The label is the same.

The balance-sheet scope is not.

Contract assets can extend the collection cycle

A company can recognize revenue before it has an unconditional right to bill.

That creates a contract asset rather than ordinary accounts receivable.

If DSO excludes material contract assets, it can understate the broader time from revenue recognition to cash.

Project businesses require extra care.

Allowances can affect DSO

Accounts receivable are commonly reported net of expected credit losses.

If the allowance increases:

net receivables decline

DSO can improve mechanically.

But expected collection quality may have worsened.

The denominator should be read with credit-loss disclosures.

Factoring can reduce DSO

Selling or factoring receivables removes balances from the balance sheet.

DSO can fall.

Cash rises.

That can be useful liquidity management.

It is not the same as customers paying faster.

Acquisitions can distort the metric

Dycom disclosed pro forma adjustments after an acquisition so the revenue denominator better matched the acquired receivable balance.^[2]

Without adjustment:

acquired receivables appear immediately
acquired revenue may appear for only part of the quarter

DSO can look artificially high.

One quarter-end can mislead

A company can close a large amount of business in the final week of the quarter.

Receivables rise.

Most invoices are not yet due.

DSO can increase despite normal collections.

Average balances and multi-period trends are more informative.

DSO and operating cash flow

All else equal:

higher DSO → more cash tied up

lower DSO → cash released

Operating cash flow also depends on inventory, payables, taxes and other working-capital items.

DSO explains one important piece.

DSO can improve because sales fell

Receivables can be collected while new sales slow.

DSO may improve.

Cash may increase.

The business may still be weakening.

Cash conversion and growth should be read together.

Example

Average receivables of $180 million divided by average daily sales of $3 million produces DSO of 60 days. If receivables rise to $240 million with daily sales unchanged, DSO rises to 80 days.

Professional note

A useful DSO review asks:

Terms: What payment period was promised?
Definition: Which receivables or contract assets are included?
Trend: Is DSO rising faster than revenue?
Quality: Are aging and allowances deteriorating?
Financing: Are receivables being sold?
Cash: Is collection performance showing up in OCF?

DSO is most useful when it measures collection speed against the actual commercial terms of the business rather than an arbitrary universal benchmark.

Related terms

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Accounts Payable
**Accounts payable** are amounts owed to suppliers for goods or services a company has received but has not yet paid for. They are generally current liabilities and can function as a form of short-term operating financing because the company receives value before cash leaves.
Accounts Receivable
**Accounts receivable** are amounts owed by customers for goods or services a company has already provided but has not yet collected in cash. Companies usually report receivables net of allowances for expected credit losses, returns, discounts or other adjustments.
Accrued Expenses
Accrued expenses are costs a company has incurred but has not yet paid in cash. They are generally recorded as liabilities so expense recognition follows the economic period rather than the payment date.
Accumulated Other Comprehensive Income (AOCI)
Accumulated other comprehensive income is the cumulative equity balance of specified gains and losses recognized in other comprehensive income rather than ordinary net income.
Add-On Acquisition
An add-on acquisition is a company purchased by an existing portfolio company—often a platform company—to expand scale, geography, products, customers, capabilities or market share.

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