A little long since you asked a couple questions:
If a company inflated its A/R and revenue in order to overstate its earnings for the year, then yes, in theory it would be detected the next year through the A/R aging report and the company would have to write the A/R off to bad debts the next year according to the company’s policy for bad debts.
Of course, if the company is willing to create fictitious journal entries, then there is no reason why it wouldn’t try to keep the scam going. The company could use lapping to apply new cash receipts to old accounts and keep its A/R aging low. The more aggregated its A/R accounts and cash deposits are the easier this would be. This is why segregation of duties is so important in fraud prevention. An auditor may be able to catch it through revenue testing by tying cash receipts to invoices, but cash deposits are typically aggregated into a single deposit and may contain thousands of transactions; furthermore, payments from other companies can often be for more than one invoice or a partial payment. An analytic may detect the fraud, but if the company is smart they will keep the fraud at less than 5% of the balance, so it doesn’t blow-up any analytic. Of course, while all fraud is material, if the company is keeping the fraud to below 5% and materiality then one could argue that the financials are not materially misstated and as such auditing techniques aren’t designed to find the fraud.
The A/R balance would, eventually, start increasing because new cash receipts would not be enough to cover the older fraud amounts that are accumulating, but if the company is growing this would take some time and the company could just take out debt and use a JE to hide the funds as receipts.
To quote Barry Minkow: “Accounts receivable are a wonderful thing”
For your commissions question, expenses are recognized in the same period as the revenues to which they relate, so when the sales event occurs and is measurable, the commission expense would be recognized by the company.
When the physical payment would occur would depend on the company. A company may pay out commission with each payroll run or may have a separate system which processes payments the 1st of each month. Since the company would be using accrual accounting, it may be easier to payout commissions when the revenue is recognized in the accounting system versus when cash is received, but the sales system may be different than the G/L so commissions may be ‘earned’ by the employee when the sales system is updated.
It really depends on the size and nature of the company and their internal policy, but the company would want a claw-back policy for any sales that eventually fall through, but that would be on the company and would be more of an operating provision. Typically for companies with a large number of commission employees, depending on size, the sales system would automatically net the commission inflows and outflow and payout the appropriate amount and the employee would get a commission statement to review each month which details their pay.