How B2B Payments Work: Moving Money Between Businesses

What B2B payments are and why they work differently

B2B payments are transactions between two businesses—a vendor sending an invoice and a buyer paying it. They move differently than consumer payments because they involve larger amounts, longer timelines, and paperwork that proves what the money is for. A small business buying supplies from a wholesaler, a contractor invoicing a construction company, or a manufacturer paying a parts supplier—these are all B2B payments.

The core difference from consumer payments is the paper trail. When you pay your electric bill, the utility company just needs your account number. When one business pays another, both sides need documentation: an invoice showing what was sold, a purchase order showing what was agreed to, and proof that the payment arrived. This documentation protects both parties and creates a record for taxes and audits.

B2B payments also move slower by design. A consumer credit card payment clears in seconds. A B2B payment through a bank wire or ACH transfer can take one to three business days. Some businesses still use checks. This delay is built into how businesses budget and forecast cash flow—they expect to pay invoices 30, 60, or even 90 days after receiving goods.

Key Takeaways

• B2B payments require documentation—invoices, purchase orders, and proof of delivery—because both businesses need a record for accounting and taxes.
• The most common methods are ACH transfers (slower, cheaper), wire transfers (faster, more expensive), and checks, each with different timing and security tradeoffs.
• Payment terms like "Net 30" or "Net 60" mean the buyer has 30 or 60 days to pay after the invoice date, not after receiving the goods.
• Late payments between businesses damage relationships and can trigger late fees, interest charges, or suspension of future orders.
• Automated invoicing and payment platforms reduce errors and speed up the payment cycle, but both businesses must be set up to use them.

The three main ways businesses pay each other

ACH transfers (Automated Clearing House) are the most common method for routine B2B payments. One business logs into its bank account, enters the other business's routing number and account number, and schedules a transfer. The money moves through the Federal Reserve's ACH network and typically arrives in one to three business days. ACH is cheap—often under a dollar per transaction—and works for any business with a bank account. The downside is the delay and the fact that ACH transfers can sometimes be reversed if the receiving account details were wrong.

Wire transfers move money faster—usually the same day or next business day—and are harder to reverse once sent. A business initiates a wire through its bank, providing the recipient's bank details and the amount. Wire transfers cost more (typically $15 to $50 per transaction) and require more verification steps. Businesses use wires when they need money to arrive quickly or when the amount is large enough to justify the fee. Wire fraud is a real risk, so both sides should verify the request through a phone call or a known contact method before sending.

Checks are still used, especially by older businesses or for one-time payments to vendors without banking relationships. A check takes three to seven business days to clear, depending on the bank and the distance traveled. Checks require no technology, which appeals to some businesses, but they create delays and require manual processing on both ends. Some vendors now charge a fee if you pay by check instead of electronic transfer.

Understanding payment terms and invoicing

When a business sends an invoice, it includes a payment term that tells the buyer when payment is due. "Net 30" means payment is due 30 days after the invoice date. "Net 60" means 60 days. "2/10 Net 30" means the buyer gets a 2% discount if they pay within 10 days, otherwise payment is due in 30 days. These terms are negotiated between the businesses and written into contracts or purchase agreements.

The invoice itself is the legal record of what was sold, the price, and the due date. It includes the vendor's business name and address, the buyer's business name and address, a description of what was sold, the amount due, and the payment instructions (which bank account to send money to, or where to mail a check). Both businesses keep the invoice for their records and for tax purposes.

Late payment between businesses can trigger late fees or interest charges, usually written into the contract. A vendor might charge 1.5% interest per month on overdue invoices, or a flat fee of $25 per week past due. Repeated late payments can damage the business relationship and lead a vendor to require payment upfront or refuse future orders. Some businesses use factoring services to get paid early—a third party buys the invoice at a discount and collects from the buyer later.

How documentation and verification protect both sides

Before a business pays an invoice, it should verify that the goods or services were actually delivered and match what was ordered. This is called a three-way match: the purchase order (what was agreed to), the invoice (what the vendor is charging), and the receipt or delivery proof (what actually arrived) should all match. If the invoice says 100 units but only 95 arrived, or if the price is higher than the purchase order, the buyer should contact the vendor before paying.

Documentation also protects against fraud. A criminal might send a fake invoice that looks like it came from a trusted vendor, asking for payment to a new bank account. Businesses prevent this by verifying payment instructions through a known contact method—calling the vendor's main phone number (not a number on the invoice) or checking the vendor's website for banking details. Never pay an invoice that arrives via email without confirming it through a separate channel.

For larger payments or new vendors, businesses often require additional documentation: a W-9 form (for U.S. tax purposes), proof of business registration, or a signed contract. This takes time upfront but prevents problems later. Some businesses use vendor management platforms that store all this information and automate the verification process.

Automated platforms and payment software

Many businesses now use invoicing and payment platforms to speed up the B2B payment cycle. Software like QuickBooks, FreshBooks, or Stripe Billing lets a vendor create and send an invoice electronically, and the buyer can pay directly from the invoice with a few clicks. The payment is recorded automatically in both businesses' accounting systems, reducing manual data entry and errors.

These platforms typically charge a fee—either a monthly subscription or a percentage of each transaction (usually 2% to 3%). The buyer and vendor both need to be set up on the same platform or compatible platforms for this to work. A small business might use one platform, but a large corporation might use a different one, so they fall back to ACH or wire transfers.

Some platforms also offer virtual card payments, where the buyer generates a unique card number for each invoice. This adds a layer of security because the card number can only be used for that specific amount and vendor. Virtual cards also give the buyer a few extra days of float—the card charges to the buyer's credit card, which isn't due for 30 days, so the buyer has time to receive and verify the goods before the money actually leaves the bank.

What happens when B2B payments go wrong

If a payment is sent to the wrong account, the outcome depends on the method. An ACH transfer to an incorrect account number might bounce back to the sender within a few days, or it might sit in the wrong account until someone notices. A wire transfer to a wrong account is much harder to recover—the receiving bank may refuse to reverse it, and the sender has to pursue a claim. This is why verification is critical before sending any payment.

If a payment is late, the vendor can charge late fees (if the contract allows), report the debt to a credit bureau, or stop shipping to the buyer. Some vendors use dunning—a series of automated reminders (email, phone call, letter) asking for payment. If the buyer disputes the invoice (says the goods were damaged or didn't arrive), the payment might be held up while both sides investigate.

For large or complex payments, businesses sometimes use a letter of credit, especially in international B2B transactions. A letter of credit is a promise from the buyer's bank that payment will be made if the seller meets certain conditions (like shipping goods on time). This protects the seller from non-payment and the buyer from paying before goods arrive.

Choosing the right payment method for your business

If you are a small business receiving payments, offer multiple methods: ACH for routine invoices, wire transfer for urgent payments, and check as a backup. Include clear payment instructions on every invoice—your business name, routing number, account number, and the address to mail checks to. Update these instructions if your bank account changes.

If you are paying invoices, set up a system to track due dates and avoid late payments. Use your accounting software to flag invoices coming due, and schedule payments a few days early to account for processing time. For new vendors, start with a small payment to verify the banking details work before sending a large amount.

For high-volume payments, consider a platform that automates the process. The upfront time to set it up pays off quickly if you are paying dozens of vendors each month. For occasional payments, ACH transfers through your bank are usually sufficient and cost almost nothing.

Frequently Asked Questions

What is the difference between Net 30 and 2/10 Net 30?

Net 30 means payment is due 30 days after the invoice date with no discount. 2/10 Net 30 means you get a 2% discount if you pay within 10 days, but if you don't take the discount, payment is still due in 30 days. The discount is an incentive for early payment and can save money if your business has cash available.

Can I reverse a B2B payment if I sent it to the wrong account?

ACH transfers can sometimes be reversed within a few days if the receiving account is wrong, but it is not may provide. Wire transfers are almost impossible to reverse. The best approach is to verify the account details before sending any payment—call the vendor or check their website to confirm the routing and account numbers.

What should I do if a vendor sends a fake invoice?

Do not pay it. Contact the vendor using a phone number or email address from their website or a previous invoice, not from the suspicious invoice itself. Ask if they sent it. If they did not, report it to your bank and delete the email. Criminals often target businesses by sending invoices that look like they came from trusted vendors.

How long does an ACH transfer take?

ACH transfers typically take one to three business days to arrive, depending on when you schedule them and your bank's processing schedule. If you send a transfer on Friday evening, it might not arrive until Tuesday. Schedule payments early to account for this delay and avoid late payments.

Do I need a contract to pay a B2B invoice?

Not always, but a written agreement protects both sides. At minimum, the invoice should clearly state what was sold, the price, the payment terms, and any late fees. For ongoing relationships or large amounts, a formal contract that covers payment terms, delivery, and dispute resolution is worth the time.