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FIFO rule to apply the credit memo

The FIFO rule is used to apply a credit memo to invoice items, starting with Invoice Item 3 and then Invoice Item 1, leaving a balance on Invoice Item 1.

The credit memo is applied to the invoice in the following way:

  1. $40 of the credit memo is applied to the Invoice Item 3. The Invoice Item 3 is fully paid. The amount of $20 is left in the credit memo.
  2. $20 of the credit memo is applied to the Invoice Item 1. The full amount of the credit memo is then applied. The reminding balance of Invoice Item 1 is $20.

The invoice details after applying the credit memo are as follows.

Invoice Item

Balance

Invoice Item 3

0

Invoice Item 1

$20

Invoice Item 2

$80

Invoice Item 4

-$10

Suppose you choose to use proration rule to apply the credit memo.

The total unapplied amount of the credit memo is $90 (= $30 + $40 + $20). The amount of credit memo you want to apply to this invoice is $60.

Credit Memo Items

Unapplied Amount

Amount To Apply

Proration Rule

Memo Item 2

$30

$20

$60 * ($30 / $90)

Memo Item 3

$40

$26.67

$60 * ($40 / $90)

Memo Item 1

$20

$13.33

Last item: $60 - ($20 + $26.67)

Memo Item 4

- $10

0

Negative unapplied amount is not included in the proration rule