management performs detailed reviews of its receivables on a monthly and/or quarterly basis to assess the adequacy of the allowances based on historical and current trends and other factors affecting credit losses and to determine if any impairment has occurred . a receivable is impaired when it is probable that all amounts related to the receivable will not be collected according to the contractual terms of the agreement . additions to the allowances for doubtful accounts are maintained through adjustments to the provision for credit losses , which are charged to current period earnings ; amounts determined to be uncollectable are charged directly against the allowances , while amounts recovered on previously charged-off accounts increase the allowances . net charge-offs include the principal amount of losses charged-off as well as charged-off interest and fees . recovered interest and fees previously charged-off are recorded through the allowances for doubtful accounts and increase the allowances . finance receivables are assessed for charge-off when an account becomes 120 days past due and are charged-off typically within 60 days of asset repossession . contract receivables related to equipment leases are generally charged-off when an account becomes 150 days past due , while contract receivables related to franchise finance and van leases are generally charged-off up to 180 days past the asset return date . for finance and contract receivables , customer bankruptcies are generally charged-off upon notification that the associated debt is not being reaffirmed or , in any event , no later than 180 days past due . snap-on does not believe that its trade accounts , finance or contract receivables represent significant concentrations of credit risk because of the diversified portfolio of individual customers and geographical areas . see note 3 for further information on receivables and allowances for doubtful accounts . other accrued liabilities : supplemental balance sheet information for 201cother accrued liabilities 201d as of 2013 and 2012 year end is as follows : ( amounts in millions ) 2013 2012 .
what is the difference between the payments for revenue from clients and the actual revenue recorded , ( in millions ) ?
inventories : snap-on values its inventory at the lower of cost or market and adjusts for the value of inventory that is estimated to be excess , obsolete or otherwise unmarketable . snap-on records allowances for excess and obsolete inventory based on historical and estimated future demand and market conditions . allowances for raw materials are largely based on an analysis of raw material age and actual physical inspection of raw material for fitness for use . as part of evaluating the adequacy of allowances for work-in-progress and finished goods , management reviews individual product stock-keeping units ( skus ) by product category and product life cycle . cost adjustments for each product category/product life-cycle state are generally established and maintained based on a combination of historical experience , forecasted sales and promotions , technological obsolescence , inventory age and other actual known conditions and circumstances . should actual product marketability and raw material fitness for use be affected by conditions that are different from management estimates , further adjustments to inventory allowances may be required . snap-on adopted the 201clast-in , first-out 201d ( 201clifo 201d ) inventory valuation method in 1973 for its u.s . locations . snap-on 2019s u.s . inventories accounted for on a lifo basis consist of purchased product and inventory manufactured at the company 2019s heritage u.s . manufacturing facilities ( primarily hand tools and tool storage ) . as snap-on began acquiring businesses in the 1990 2019s , the company retained the 201cfirst-in , first-out 201d ( 201cfifo 201d ) inventory valuation methodology used by the predecessor businesses prior to their acquisition by snap-on ; the company does not adopt the lifo inventory valuation methodology for new acquisitions . see note 4 for further information on inventories . property and equipment : property and equipment is stated at cost less accumulated depreciation and amortization . depreciation and amortization are provided on a straight-line basis over estimated useful lives . major repairs that extend the useful life of an asset are capitalized , while routine maintenance and repairs are expensed as incurred . capitalized software included in property and equipment reflects costs related to internally developed or purchased software for internal use and is amortized on a straight-line basis over their estimated useful lives . long-lived assets are evaluated for impairment when events or circumstances indicate that the carrying amount of the long-lived asset may not be recoverable . see note 5 for further information on property and equipment . 2013 annual report 73 .