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How days sales outstanding works

Days sales outstanding is how long, on average, sales sit as receivables. On this sheet DSO is 45 days. Plus 60 days of inventory that is a 105 day operating cycle. Minus 30 days of payables leaves a 75 day cash conversion cycle.

Cash conversion cycle

75 days

Inventory and receivables hold cash for 105 days. Payables give 30 days of that back.

Operating cycle (DSO + DIO)
105 days
Days payable outstanding
30 days
Cash conversion cycle
75 days

How long customers take to pay. Receivables over daily sales.

How long stock sits. Inventory over daily cost of goods.

How long the firm takes to pay suppliers. A larger figure shortens the cycle.

On this page

Next on Models and deals

Inventory turnover

In short

  • DSO is the customer clock. On the first sheet it is 45 days.
  • Plus DIO of 60 that is a 105 day operating cycle. Minus DPO of 30 is a 75 day CCC.
  • DSO 30 with DIO 20 is a 50 day operating cycle. DPO 100 then makes CCC minus 50 days.
  • DSO 40 with equal clocks of 40 is an 80 day operating cycle and a 40 day CCC.
  • How the operating cycle works owns the sum. This page owns the customer piece.

How long the invoice sits

Days sales outstanding asks how long, on average, a sale sits as a receivable before it is cash:

DSO=ReceivablesSales/365DSO = \frac{\text{Receivables}}{\text{Sales}/365}

This calculator does not run that division. DSO is an input. Type the days your sheet already has. On the first sheet that is 45.

Plus DIO of 60, the operating cycle is 105 days. Minus DPO of 30, the cash conversion cycle is 75 days. The cash conversion cycle calculator on this page prints those sums. This page owns the 45.

Receivables turnover is 365 over this DSO, the same clock as a turns figure.

A shorter customer wait under a negative CCC

DSO 30, DIO 20, DPO 100. The operating cycle is 50 days. CCC is minus 50 days.

Customers paid in 30 days. Stock sat 20. Suppliers were paid at 100. The customer clock did not go negative. Payables did the work that flipped CCC. Quoting DSO as if it were the cycle is how a collections win gets read as a cash-cycle win.

Equal clocks still leave a customer wait

DSO 40, DIO 40, DPO 40. Operating cycle 80 days. CCC 40 days. Matching DSO to DPO does not zero the customer clock. Invoices still sit 40 days. The 40 of payables funds only part of the 80.

365 or 360, sales not cost

The usual construction is receivables over daily sales, on a 365 day year. Some ledgers use 360. Name the year. DIO and DPO usually sit on daily cost of goods, not daily sales. Mixing a sales denominator into those two clocks is a different set of days than this calculator will add.

A 45 day DSO on a growing book still consumes more cash next year, because the same days sit on a larger sales number.

Cutting DSO is not free

Refusing slow-paying customers, or pulling terms from 45 days to 30, shortens the clock and can shrink the book. The working capital dollar figure is the receivable identity. This is the days identity.

DSO against DPO is the customer clock against the supplier clock.

What this page is not doing

It is not a collections forecast, not a turnover table, and not a target of 45 days. The three sheets are DSO 45 (operating cycle 105, CCC 75), DSO 30 (operating cycle 50, CCC minus 50), and DSO 40 (operating cycle 80, CCC 40). This is educational material, not financial advice.

Worked examples

DSO 45 on the first sheet

DSO 45, DIO 60, DPO 30. What is the customer clock doing inside the cycle?

  1. DSO is 45 days.
  2. Operating cycle: 45+60=10545 + 60 = 105 days.
  3. CCC: 105−30=75105 - 30 = 75 days.

DSO is 45 days. The operating cycle is 105 days. CCC is 75 days.

DSO 30 under a negative CCC

DSO 30, DIO 20, DPO 100. What is DSO doing?

  1. DSO is 30 days.
  2. Operating cycle: 30+20=5030 + 20 = 50 days.
  3. CCC: 50−100=−5050 - 100 = -50 days.

DSO is 30 days. The operating cycle is 50 days. CCC is minus 50 days. The customer clock stayed positive.

DSO 40 with equal clocks

DSO 40, DIO 40, DPO 40. What is DSO?

  1. DSO is 40 days.
  2. Operating cycle: 40+40=8040 + 40 = 80 days.
  3. CCC: 80−40=4080 - 40 = 40 days.

DSO is 40 days. The operating cycle is 80 days. CCC is 40 days.

Common questions

Does this calculator compute DSO from receivables?

No. DSO is an input. Receivables over daily sales is the usual construction, on a 365 day year unless you named 360.

Is a lower DSO always better?

It is a shorter wait. It can also be tighter terms that shrink the book. Compare inside a sector.

Is 45 days a target?

It is the teaching-sheet customer clock. This is educational material, not financial advice.

Keep reading

This page is educational material, not financial advice. The figures come from the formula shown and assume the inputs you enter hold for the whole term. Your own rate, fees, taxes and timing will differ, so treat the output as arithmetic to check a decision against, not as a recommendation.