An increase in accounts receivable is a use of cash, not a source. When the receivables balance grows, the business has booked revenue it hasn’t actually collected, so reported profit overstates the money that came in. On the statement of cash flows, that increase gets subtracted from net income to arrive at the real cash figure.
Why AR Moves This Way
The whole issue exists because of accrual accounting. Under the accrual method, a business records revenue the moment it earns it, not when payment arrives. A $15,000 invoice sent in March counts as March revenue even if the customer pays in May. The sale hits the income statement immediately, and accounts receivable goes up by the same amount. The income statement says the business made $15,000. The bank account says otherwise.
Cash-basis accounting only records revenue when the money actually lands. A cash-basis business wouldn’t report that $15,000 until May, and the AR-versus-cash timing gap never arises. Most sole proprietors and very small businesses use this simpler approach.
Federal tax law decides who has a choice. C corporations and partnerships with a corporate partner generally must use accrual accounting unless they qualify as small business taxpayers, which turns on an average annual gross receipts test.1Internal Revenue Service. Revenue Procedure 2025-32 Larger businesses and tax shelters of any size are locked into the accrual method.2Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting Any company big enough to carry a meaningful AR balance is almost certainly on accrual, which means the gap between reported profit and collected cash is a real and ongoing concern.
What Actually Happens Economically
Think about what a credit sale really is. When a business ships $50,000 worth of product on 30-day terms, it has already spent real money on materials, labor, and overhead to produce and deliver that product. The $50,000 shows up as revenue, but the cash hasn’t arrived. In effect, the business funded the customer’s purchase out of its own pocket. A growing AR balance is interest-free financing extended to customers.
That’s why a profitable company can still run out of cash. If AR grows faster than collections, every new sale can actually worsen the short-term cash position, because the company keeps spending to fulfill orders while waiting longer to get paid. Rapid revenue growth with extended payment terms is one of the classic ways an otherwise healthy business ends up scrambling to make payroll.
How the Adjustment Works on the Cash Flow Statement
The statement of cash flows reconciles reported profit with actual cash movement. Nearly all U.S. public companies prepare it using the indirect method, which starts with net income and works backward to figure out how much cash the business actually generated.3U.S. Securities and Exchange Commission. Improving the Quality of Cash Flow Information Provided to Investors
Changes in receivables show up in the operating activities section. The mechanics are simple:
- An increase in AR appears as a negative number, reducing net income toward the true cash figure.
- A decrease in AR appears as a positive number, adding cash back in.
The arithmetic is easy to see with numbers. If net income is $100,000 and AR increased by $20,000 during the period, the business only collected $80,000 of that income in actual cash, so you subtract the $20,000. Run the same logic in reverse: if AR decreased by $10,000, the company collected more cash than it recorded in new revenue, likely because customers paid down invoices from prior periods. That $10,000 gets added back as a cash inflow.
The result of all the operating-section adjustments is a line called cash flow from operating activities. That number tells you how much cash the core business actually produced, and it’s more reliable than net income for judging whether a company can cover its bills, service its debt, and invest in growth. Strong reported profits alongside negative operating cash flow is a classic warning sign, and a ballooning AR balance is one of the most common causes.
How to Tell If Your AR Is a Problem
Days sales outstanding (DSO) puts a number on how long AR is tying up cash. Divide the AR balance by total credit sales for the period, then multiply by the number of days in that period. A DSO of 45 means it takes an average of 45 days to collect after a sale.
What counts as healthy depends on the industry. Retail and hospitality businesses that collect at the register run near zero. For most B2B companies, 30 to 45 days is considered solid. Construction, manufacturing, and enterprise software companies routinely run 60 days or more because of longer project cycles and extended payment terms.
A rising DSO matters more than a high-but-stable one. If DSO climbs from 40 to 55 days over a few quarters, something is changing: customers paying more slowly, the sales team offering looser terms to close deals, or gaps in the invoicing process. Each additional day of DSO means more cash trapped in receivables and unavailable for operations.
You Still Owe Tax on Money You Haven’t Collected
This is the practical consequence that catches business owners off guard. Accrual-basis companies owe income tax on revenue when it’s earned, regardless of whether the customer has paid. A business that records $500,000 in credit sales during the year owes tax on that revenue even if $80,000 of it is still sitting in AR on December 31. The tax obligation is immediate; the cash to pay it may not be.
Bad debt relief exists, but the rules are strict. When a specific debt becomes genuinely worthless, an accrual-method business can claim a federal tax deduction for the loss. The IRS requires the business to show it took reasonable steps to collect and that there’s no realistic expectation of repayment, and the amount owed must have been previously included in gross income. Overdue is not the same as worthless. That creates a timing gap where the tax hit arrives months or years before the corresponding deduction becomes available. Cash-method taxpayers face a different problem: because they never recorded the revenue in the first place, they generally can’t claim a bad debt deduction for unpaid invoices at all.4Internal Revenue Service. Topic No. 453, Bad Debt Deduction
Businesses with large AR balances and thin cash reserves need to plan for this. Setting aside a portion of each recorded sale in a reserve for the tax liability, rather than assuming the cash will arrive before taxes are due, is one way to avoid the crunch. The alternative is discovering at tax time that you owe the IRS money you never actually received, which is exactly the kind of squeeze an AR-heavy business walks into when it only watches the income statement and ignores what’s happening on the balance sheet.