The one-paragraph version
When you factor an invoice you sell it to the factor. The factor now owns the right to be paid, so it needs your customer to send the money to the factor's account rather than yours. The notice of assignment (NOA) is the letter that makes that happen. It tells the customer that your receivables have been assigned, gives the new remit-to details and, once received, legally obliges the customer to pay the factor. Everything else about the NOA follows from that one job.
Who sends it, and to whom
The factor prepares the NOA, usually on its letterhead, and you sign it as the assignor so the customer can see you agreed to it. It goes to the accounts payable contact at each customer whose invoices you will factor. In freight that is the freight broker or the shipper's payables team; in staffing it is the client's accounts payable department. The factor normally sends it before it advances on the first invoice from that customer, and it often asks the customer to acknowledge it in writing or through a payables portal.
An NOA is customer-specific, not invoice-specific. One letter covers every invoice you issue to that customer from then on, which is why most factoring agreements let the factor send one to any customer it has approved. If you want to factor only some customers, the contract has to say so; the NOA will still go to every customer whose invoices the factor buys.
The legal basis
The NOA works because of Article 9 of the Uniform Commercial Code, which every state has adopted in some form. Section 9-406(a) says an account debtor may discharge its obligation by paying the assignor until, but not after, it receives a notification, authenticated by the assignor or the assignee, that the amount due has been assigned and that payment is to be made to the assignee. After receipt, the account debtor may discharge its obligation only by paying the assignee (Cornell LII — UCC § 9-406).
In plain terms: once your customer has received a proper NOA, paying you no longer counts. If it pays you anyway, it still owes the factor. That is the entire reason factors care so much about the NOA being delivered, acknowledged and kept on file.
The same section sets limits that protect the customer. A notice is ineffective if it does not reasonably identify the rights assigned, and the customer may ask the assignee for reasonable proof that the assignment was made; until the factor supplies it, the customer can keep paying you (Cornell LII — UCC § 9-406). That is why a well-drafted NOA names you, names the factor, describes the receivables covered and gives a contact for questions.
What the letter says
NOAs vary in length but cover the same points:
- Your business name and that you have assigned your accounts receivable to the factor.
- The factor's name and the remit-to instructions: a lockbox address, or bank account details for ACH and wire.
- A statement that the assignment applies to all current and future invoices from you, until the factor sends written notice that it has been released.
- That the customer should direct payment questions and remittance advice to the factor.
- Sometimes a request that the customer confirm the invoice balance it currently shows as open, and an acknowledgement block to sign and return.
Read the draft before it goes out. It is the first thing your customer will learn about your financing, and a clumsy letter can raise questions a clear one would not.
How customers react
In freight, almost nobody blinks. Brokers handle NOAs every week, their payables systems have a field for the factor on file, and many broker portals let the factor upload documents directly. A broker that refuses to honor NOAs is unusual enough to be a warning sign about the broker rather than about you.
Outside freight, reactions range from routine to uneasy. Large companies and government payers process assignments as a matter of course, though they may have their own form and their own timeline. Smaller clients sometimes read an NOA as a sign of trouble. The fix is to tell them first, in your own words, that you are using a receivables finance company to smooth cash flow and that the only change on their side is the remit-to address. Many factors will also talk to a customer directly if asked. Industries where the customer relationship is the whole business, such as manufacturing suppliers with a handful of large accounts, should think this through before signing.
What happens if a customer pays you anyway
It happens, especially in the first month when a customer's payables system still shows your old account. The factor's agreement will say what to do, and it is nearly always the same thing: you hold the funds in trust for the factor and forward them promptly, usually within a stated number of days. Keeping or spending a misdirected payment is a breach of the agreement, and most contracts attach a fee or a higher rate to it. Some treat a pattern of it as a default.
Practically, tell the factor the same day, send the money and ask the factor to re-send the NOA to that customer. Because the customer's obligation to the factor survived its payment to you under § 9-406, the factor could pursue the customer for a second payment; it will far rather you just forward the first one.
The letter of release when you leave
The NOA stays in force until the factor withdraws it. When you stop factoring, or move to another factor, the old factor sends each customer a release letter saying the assignment has ended and payments should go back to you (or, in a switch, that a new NOA from the new factor will follow). Factors send the release once the buyout is settled and open invoices are collected or repurchased. Until the release goes out, your customers are still legally required to pay the old factor, so the timing of that letter decides when your cash flow returns to normal. Our guide to switching factoring companies walks through the buyout and the release in order.
Get the release obligation in writing before you sign: who sends it, how soon after the final settlement, and to whom. A factor that is slow to send releases can hold your receivables hostage without doing anything else wrong.
NOA versus UCC-1
People mix these up because both arrive when you start factoring. They do different jobs.
| Notice of assignment | UCC-1 financing statement | |
|---|---|---|
| Who receives it | Your customers | The public record, filed with your state's filing office |
| What it does | Redirects payment to the factor | Gives public notice of the factor's interest in your receivables and sets priority against other lenders |
| Legal source | UCC § 9-406 | UCC § 9-502 and related sections |
| When it ends | Factor sends a release letter | Factor files a termination statement |
A financing statement needs only your name, the secured party's name and an indication of the collateral covered to be sufficient (Cornell LII — UCC § 9-502). It says nothing to your customers and does not change who they pay. The NOA is what changes who they pay. When a factoring relationship ends you want both undone: the release letters to customers, and the termination statement on the public record. Article 9 gives a debtor a way to demand that termination; in cases covered by § 9-513(c), the secured party has 20 days after an authenticated demand to send or file it once nothing is owed (Cornell LII — UCC § 9-513). A lingering UCC-1 is the most common reason a new factor or lender stalls on your file.
NOAs in freight
Freight has its own habits. Brokers often require the NOA before they will update the remit-to address, and some will only pay the factor they have on file even if you ask them to pay you directly, because paying the wrong party exposes them under § 9-406. Many broker portals show the factor name on each load, which is also how a factor checks for a competing assignment when you switch. If you have a quick-pay arrangement with a broker, the NOA usually ends it, because the broker now pays the factor on the factor's terms. Ask the factor how it handles quick-pay brokers before you assign them.
Carriers that factor some loads and not others should know that a customer-level NOA makes that hard. Once a broker has your factor's NOA, it will send every payment there. Spot or selective factoring works at the customer level, not the invoice level, unless the factor and the broker agree otherwise. The trucking best-of list notes which profiled factors advertise no minimums and selective programs; the NOA mechanics are the same at all of them.
Checklist before you sign
- Ask to see the NOA template and the release letter template.
- Confirm which customers will receive an NOA, and whether you can exclude any.
- Find the misdirected-payment clause in the agreement and note the forwarding deadline and any fee.
- Get the release timing in writing: how many days after final settlement, and whether the factor also files the UCC termination.
- Decide who tells your customers, and tell them before the letter arrives.
- Check for any existing UCC-1 on your receivables, because an earlier lender's filing has to be released or subordinated before the factor's assignment is clean.
The contract guide goes clause by clause through the agreement the NOA sits inside. When you are ready to compare factors, the get-matched wizard shows which profiled companies name your industry, serve your state and accept your volume; we connect you with a factor that fits, and the factor quotes its own terms.
Frequently asked questions
Does my customer have to agree to the notice of assignment?
No. Under UCC § 9-406 the obligation to pay the assignee arises when the customer receives a proper notice, not when it consents. The customer can ask the factor for reasonable proof of the assignment first, and the notice must reasonably identify what was assigned. Factors still ask for a signed acknowledgement because it removes any later argument about whether the notice was received.
Can I keep the notice of assignment confidential?
Not with ordinary factoring. The NOA is sent to your customers by design, because redirecting their payment is the point. Arrangements where the customer is not told exist in some receivables finance structures, but they are not what the factors we profile offer to small and mid-sized businesses, and they usually require stronger credit on your side.
What if I accidentally deposit a check meant for the factor?
Tell the factor that day and forward the funds within the window your agreement sets. Most agreements treat the money as held in trust for the factor and charge a fee or a penalty rate if it is late. The customer still owes the factor until the factor is paid, so holding the money helps nobody.
Does the notice of assignment go away when I stop factoring?
Only when the factor sends a release letter to each customer. Until then your customers remain obligated to pay the factor. Get the release timing in writing before you sign, and ask the factor to confirm each release was sent when you leave.
Is a notice of assignment the same as a UCC filing?
No. The NOA goes to your customers and changes who they pay. The UCC-1 goes on the public record and tells other lenders the factor has an interest in your receivables. Ending a factoring relationship cleanly means both a release letter to customers and a UCC termination statement on file.