Open Credit Memos: How AR Teams Clear Them From the Aging and Get Paid
Unapplied credit memos overstate past-due balances, confuse customer statements and stall collection calls. Why they stay open, how to apply them in the common ERPs, and a weekly routine that keeps them from piling up.
Pratheek Adi
Co-Founder & CTO
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A customer calls about an overdue invoice and says, "We have a credit with you, we were waiting for you to take it off." Your collector checks the aging and finds the credit memo sitting there, posted weeks ago, never applied to anything. The invoice is past due on paper, the customer considers it settled in part, and the conversation stalls while someone sorts it out.
Open credit memos are one of the quietest sources of noise in accounts receivable. Atradius reports that 43% of credit-based B2B sales in the US are overdue (Atradius Payment Practices Barometer, US 2025), and every unapplied credit makes that overdue list harder to read: balances look larger than they are, statements confuse customers, and collectors spend calls explaining paperwork instead of asking for payment.
This guide is for the controller or AR manager running a team of three to five collectors on NetSuite, Sage Intacct, Business Central or QuickBooks, with hundreds of open items. It covers why credit memos stay open, how to apply them in the common systems, and a weekly routine that keeps them from piling up.
What Is an Open Credit Memo in Accounts Receivable?
An open credit memo is a credit you have issued to a customer that has not yet been applied to an invoice or refunded, so it still sits on the customer's account as an unused balance. It reduces what the customer owes in total, but until it is matched to a specific invoice, the invoice it was meant for keeps aging as if nothing happened.
That gap creates three problems at once:
The aging overstates past-due balances on the invoices the credit was meant for, and understates the customer's net position.
The customer sees a different number than your collector does, because the customer usually nets the credit in their own books.
Follow-up goes to the wrong place, chasing an invoice the customer believes is partly or fully covered.
Credit memos are not the same as unapplied payments. An unapplied payment is cash you received but have not matched to an invoice; we cover that in our guide to unapplied cash. An open credit memo is a reduction you granted. Both need matching, and both distort the aging the same way.
Why Do Credit Memos Stay Open?
Most open credits are not mistakes in the credit itself. They come from the handoff between whoever issues the credit and whoever applies it.
The credit was issued without an invoice reference
A sales rep or customer service lead approves a credit for a return, a damaged shipment or a billing error, and the credit gets posted to the customer account with no link to the invoice it relates to. Your system does not know where it belongs, so it waits.
Auto-apply sent it to the wrong invoice, or nowhere
Several systems can apply credits automatically to the oldest open invoice. QuickBooks Online, for example, has an optional setting that does exactly that, and when a customer has no unpaid invoices the credit memo stays unapplied and the customer balance goes negative (QuickBooks Help, credit memos and delayed credits). Oldest-first is a reasonable default, but if the credit was for a specific shipment, it can end up on an invoice the customer never disputed.
The customer already took it
Many customers short-pay the next invoice by the amount of the credit they expect. Cash arrives short, the credit memo stays open, and now you have a short payment and an open credit that should cancel each other out. If no one connects the two, both age. Our guide to customer deductions and short payments covers the wider short-pay problem.
Currency, entity or account mismatches
In multi-entity or multi-currency setups, a credit can only be applied to invoices that match it. NetSuite's help notes that with Multiple Currencies on, only invoices in the currency of the memo appear for application, and that the account fields on the credit memo and the invoice need to match (NetSuite Help, Applying a Customer Credit Memo). A credit posted under the wrong entity or account simply never finds its invoice.
No one owns the cleanup
Applying a credit looks like an accounting task, so collectors leave it. Issuing the credit looks like a sales or service task, so the accounting team does not hear about it. The credit sits in between.
How Do You Apply a Credit Memo to an Invoice?
The steps differ by system, but the logic is the same: find the credit, find the invoice it belongs to, and record the application so both lines close or reduce. Here is how the four systems our customers use most handle it.
System | Where you apply it | Auto-apply option | Watch for |
|---|---|---|---|
NetSuite | Apply subtab on the credit memo, the Credits subtab on a customer payment, or Credit from an open invoice | Auto Apply on the credit memo applies to the oldest invoices due | Currency and account fields must match the invoice |
QuickBooks Online | Receive payment, select the invoice, then select the credit in the Credits section | Optional setting applies new credits to the oldest unpaid invoice | A credit with no unpaid invoice leaves a negative balance |
Business Central | Applies-to Doc. No. on the sales credit memo, or Apply Entries from customer ledger entries | Application defaults to the maximum amount if none is entered | Use Apply Entries when one credit covers several invoices |
Sage Intacct | Receive Payments (Apply credits or Credits available), or Apply more from the AR adjustments list | Credits are spread across selected invoices oldest to newest | In multi-entity setups, credits go to the owning entity's invoices first |
NetSuite
NetSuite gives you three places to apply a credit: on the credit memo itself through its Apply subtab, on a customer payment through the Credits subtab, or from an open invoice by clicking Credit to create a memo already tied to it. The help page's own example is a customer who remits $75 against an invoice that also carries a $25 credit memo, with one transaction applying both (NetSuite Help). That pattern, payment plus credit in one step, is the one to train your team on, because it is exactly how customers pay.
QuickBooks Online
In QuickBooks Online you apply a credit memo through Receive payment: pick the customer, select the invoice in Outstanding Transactions, select the credit in the Credits section and enter the amount to apply. QuickBooks also separates credit memos, which reduce the open balance right away, from delayed credits, which wait to be added to a future invoice (QuickBooks Help). If your team uses both, make sure collectors know which one the customer was promised.
Business Central
Business Central lets you apply a credit to one invoice by filling in the Applies-to Doc. No. field on the sales credit memo, or to several invoices with the Apply Entries action, where you set an Applies-to ID and an Amount to Apply on each line (Microsoft Learn, reconcile customer payments). For credits that were posted without a reference, the Apply Entries action from the customer's ledger entries is the cleanup tool.
Sage Intacct
Sage Intacct applies credits from the Receive Payments screen, using Apply credits for several credits or the Credits available link for one invoice, or from the AR adjustments list with Apply more. In multi-entity companies, credits go to the owning entity's invoices first, then oldest to newest, and a credit cannot be applied to another customer's invoices, even a parent or child account (Sage Intacct Help, apply an AR credit to an invoice). If your customers pay at the parent level, decide in advance who moves the credit to the right account.
How Do Open Credits Affect DSO and Collections?
An open credit does not change what the customer owes in total, but it changes how your receivables look and how your team spends its time.
The aging tells the wrong story
The invoice the credit was meant for shows its full amount in an older bucket. If you review the aging by bucket, as we describe in our guide to AR aging report analysis, those invoices look worse than they are, and the credit sits in a column most reviews skip.
Collectors chase the wrong balance
When a collector asks for the full invoice amount and the customer already netted a credit, the call turns into a reconciliation exercise. The customer pushes back, the collector has to look it up, and the promise to pay slips, one of the patterns in our guide to handling delayed payments from customers. "We have a credit with you" is one of the most common reasons customers give for not paying, alongside the others in our list of the top excuses for late payments.
Statements stop making sense
A customer reading an open-item statement sees an invoice at full value and a separate credit line. Some will call to ask, many will just pay the net amount on their own schedule. Our guide to customer statements covers how to make statements easier to act on.
DSO reads cleaner or worse depending on the timing
Because open credits reduce the receivables total while the related invoices keep aging, they can distort how DSO is calculated from one month to the next. A month where a batch of old credits finally gets applied can look like a collections improvement that never happened.
How Do You Clear a Backlog of Open Credit Memos?
If your aging carries dozens of old credits, treat it as a one-time project before you set up a routine.
Step 1: Pull every open credit into one list
Export open credit memos and unapplied credits by customer, with date, amount, the person who issued each one and any reference or memo text. Sort by amount, largest first.
Step 2: Match each credit to its source
For each credit, find the reason: return, damaged goods, billing error, rebate, overpayment. The memo text and the issuer usually tell you. If the reason points to a specific invoice, that is where it goes.
Step 3: Check the customer's remittances
Look at short payments from the same customer around the credit date. If the customer already deducted the credit, apply the credit to the short-paid invoice and both items close together.
Step 4: Confirm with the customer when it is unclear
For large or old credits with no obvious home, ask the customer's AP contact how they recorded it. A short email that lists the credit and asks which invoice they applied it to settles most cases in one reply.
Step 5: Apply, refund or escalate
Apply credits that match. Refund credits the customer wants back. Send anything that looks like a dispute to the person who owns disputes, using the process in our guide to resolving invoice disputes. If an open credit question keeps an invoice unpaid well past your normal cadence, the criteria in when to escalate an invoice apply.
Step 6: Log what you learned
Note which teams issued the credits that had no reference. That list tells you where the routine needs to start.
How Do You Keep Credit Memos From Piling Up?
A backlog comes back if the process that created it stays the same. Four habits keep the aging clean.
Require an invoice reference on every credit, so the credit can be applied the day it is issued.
Notify the account's collector when a credit posts, so they know before the next call.
Review open credits weekly, as a short standing item in the team's AR review, with a named owner for each customer.
Decide your auto-apply rule on purpose, oldest-first or manual, and write it down so everyone handles credits the same way.
Where Does Abivo Fit?
Abivo keeps follow-up accurate on every account by working from your live ERP data, so collectors and customers are talking about the same balance. Kate, Abivo's AI collections agent, reads the open items on each account, including credits, sends follow-up by email and phone on a set cadence, and records what the customer says. When a customer replies that they are waiting on a credit, Kate logs it on the account and hands it to your team with the context attached, so the person who can apply the credit sees it right away.
Your collectors spend their time on the credits, disputes and key accounts that need a person, while routine follow-up keeps running everywhere else. OFS, a trades client, recovered $842,518 in four months, cut DSO by more than 30 days and went from four collectors to one (read the OFS case study).
Practical Takeaways for AR Managers
Treat open credits as part of collections, not a separate accounting chore.
Match every credit to an invoice on the day it is issued, with a required reference.
Look for short payments that cancel out open credits from the same customer.
Clear the backlog once, largest first, with a confirmation email for unclear credits.
Review open credits weekly with a named owner per customer.
Train collectors on the payment-plus-credit application in your system.
Frequently Asked Questions
What is the difference between a credit memo and an unapplied payment?
A credit memo is a reduction you grant a customer, for a return, a billing error or a rebate. An unapplied payment is cash you received but have not matched to an invoice. Both sit on the account until they are applied, and both make the aging harder to read.
Should credit memos be applied to the oldest invoice?
Only when the credit is not tied to a specific invoice. If the credit relates to a particular shipment or billing error, apply it to that invoice so your records match what the customer sees.
How often should AR teams review open credit memos?
Weekly is a good rhythm for a team with hundreds of open items. A short review of new and aging credits, with one owner per customer, keeps the list from building up.
What should a collector say when a customer mentions a credit?
Confirm the credit amount and date, ask which invoice the customer applied it to, and agree on the remaining balance and a payment date. Then make sure the credit gets applied the same day.
Do open credit memos affect DSO?
They can. Open credits reduce total receivables while the related invoices keep aging, so DSO and the aging buckets can shift when old credits are finally applied. Applying credits promptly keeps the numbers comparable month to month.
If you want follow-up that works from the same balance your customers see, get started with Abivo.
