The installment sales method is one of several approaches used to recognize revenue under the US GAAP, specifically when revenue and expense are recognized at the time of cash collection rather than at the time of sale. Under the US GAAP, it is the principal method of revenue recognition when the recognition occurs subsequently to the sale. Installment sales method The installment sales method, is used to recognize revenue after the sale has occurred and when sales are stipulated under very extended cash collection terms. In general, when the risk of not being able to collect is reasonably high and when there is no reasonable basis for estimating the proportion of installment accounts, revenue recognition is deferred, and the installment sales method is used. The installment sales method is typically used to account for sales of consumer durables, retail land sales, and retirement property. Under the cost recovery method, another method to recognize income after the sale is made, no profit is recognized until all the costs are recovered. Calculation under the installment sales method The installment sales method recognizes revenue and income proportionately as cash is collected. The amount recognized in any period is thus based on two factors: The gross profit percentage: The amount of cash collected on installment accounts receivable. Below is an example of calculation of installment sales for years 2009 and 2010. 2009 income from installment sales calculation: The income recognized in 2009 equals cash collections in 2009 multiplied by the gross profit percentage in 2009 and is calculated as follows: $300,000×30% = $90,000 Such income is shown on the 2009 income statement as 2009 income from installment sales. 2009 Deferred Gross Profit calculation: The deferred gross profit is an A/R contra-account and is the difference between gross profit and recognized income and is calculated as follows: $360,000 − $90,000 = $270,000 The deferred gross profit is thus deferred and recognized in income in subsequent periods, i.e. when the installment receivables are collected in cash. 2010 income from installment sales is $288,800 and calculated as follows: A more comprehensive table would clearly show gross profit and deferred income recognized for each year: 2009 and 2010. Installment sales and the related costs of good sold must be tracked by individual year in order to compute the gross profit percentage that applies to each year. Furthermore, the accounting system must correctly match the cash collections with the