Payment Processing Insights

Payment Gateway Fees: Why Charges Appear on Separate Invoices

If your business accepts card payments online, over the phone, or through a virtual terminal, you may be paying payment gateway fees. These are charges for the technology that helps your customers' payment information reach the payment processor securely. Depending on your setup, you might pay a monthly fee, a small charge for each transaction, or both. Sometimes these costs are included in your processing fees, and sometimes they're charged separately.

November 9, 202611 min readPosNexus

Here's what many business owners don't realize: your payment gateway fees might not show up on your regular credit card processing statement. Another company could be billing you separately, even if you use just one system to accept payments. That means you could be looking at your processing statement and still not seeing the full cost of accepting cards. Knowing where these charges come from is the first step toward understanding what you're actually paying.

What Do Payment Gateway Fees Look Like?

Gateway fees aren't always complicated. Sometimes it's a monthly charge, sometimes it's a fee for each payment, and sometimes it's both. Here's how that might look for your business.

1. A Monthly Fee

Let's say your gateway provider charges $25 a month. Whether you process 100 payments or 3,000, that $25 stays the same.

2. A Fee Per Transaction

Now suppose you're charged $0.05 for every transaction. If you process 3,000 payments in a month, that's another $150 in gateway fees.

3. A Separate Gateway Bill

Put those charges together, and you're paying $175 a month in gateway fees.

But here's the catch: that $175 might not appear on your regular credit card processing statement. Your gateway provider could be billing you separately.

So even if your processing statement looks fine, you might not be seeing the full picture.

The takeaway: Check both your processing statement and any separate gateway invoices to understand what you're actually paying.

These numbers are illustrative examples, not standard gateway rates.

What Is a Payment Gateway and How Does It Work?

A payment gateway is technology that securely transmits payment information for authorization when a business accepts electronic payments.

It connects a website, virtual terminal, or compatible payment system with the services involved in processing a transaction.

How Does a Payment Gateway Process a Payment?

Customer initiates payment. A customer enters card information or pays through a connected payment system.
Gateway transmits the request. Payment information is securely sent for authorization.
Processor routes the request. The processor and card network communicate with the cardholder's issuing bank.
Bank approves or declines. The issuing bank returns its authorization decision.
Payment system receives the response. The business sees whether the transaction was approved or declined.

This process usually takes seconds.

The gateway helps transmit payment information. Other payment providers handle processing, settlement, and related services.

What Types of Payment Gateway Fees Can You Be Charged?

Payment gateway charges vary depending on the provider, contract, payment volume, and services your business uses.

Some are recurring, while others depend on transaction activity.

Gateway fee type	What it covers	How it's commonly charged
Monthly gateway fee	Access to gateway services	Monthly
Transaction fee	Gateway payment requests or transactions	Per transaction or attempt
Setup fee	Initial gateway configuration	One-time
Additional service fee	Optional tools or integrations	Monthly or usage-based
Termination fee	Early cancellation, if applicable	One-time

Monthly Gateway Fees

A monthly gateway fee is a recurring charge for using gateway services.

Your business may owe this fee even during a month with few transactions.

Per-Transaction Gateway Fees

Some gateways charge a small amount for each transaction or payment request.

Check whether the provider charges for declined transactions, refunds, or other payment events.

Setup and Additional Service Fees

Some providers charge for initial setup, integrations, fraud screening, recurring billing, or advanced reporting.

Ask which services are included and which cost extra.

Are Chargeback and International Fees Gateway Fees?

Not necessarily.

Chargeback fees, currency conversion charges, interchange fees, and some batch or compliance fees are generally associated with broader payment services.

They may appear alongside gateway charges, but that doesn't automatically make them gateway fees.

How Much Does a Payment Gateway Cost?

Payment gateway cost depends on the provider's pricing structure, transaction volume, and included services.

A gateway may have a monthly fee, a transaction fee, both, or no separately itemized gateway charge.

For example, a business paying $25 monthly plus $0.05 per transaction would pay $175 for 3,000 transactions.

However, that amount doesn't include the business's broader card processing fees.

What Affects Your Total Gateway Cost?

The main factors include transaction volume, recurring fees, optional features, integration requirements, and contract terms.

Compare the total amount you'd pay over a typical month rather than focusing on a single advertised fee.

Payment Gateway Fees vs. Processing Fees: What's the Difference?

Gateway fees cover gateway technology and related services. Processing fees cover the broader services involved in accepting card payments.

The two may be bundled into one price or billed separately.

Payment gateway fees	Payment processing fees
Gateway access and functionality	Card processing services
May be fixed or transaction-based	Often percentage-based plus fixed fees
Can be billed by a separate provider	Typically billed by a processor or payment provider
May be included in a bundled plan	May include interchange, network fees, and processor markup

Can a Business Pay Both Fees?

Yes. A business may pay processing fees and an additional gateway fee on the same transaction.

This isn't automatically double billing because the charges may cover different services.

How Do Payment Processing Pricing Models Compare?

Payment processors commonly offer flat-rate, interchange-plus, or tiered pricing.

These models mainly describe processing costs, not gateway-only charges.

Flat-rate pricing: A defined rate, often a percentage plus a fixed fee, for eligible transactions.
Interchange-plus pricing: Interchange costs plus processor markup and other applicable charges.
Tiered pricing: Different rates based on the processor's transaction categories.

A low advertised processing rate doesn't necessarily mean a low total payment cost.

Why Are Payment Gateway Fees Billed Separately?

Gateway fees may be billed separately when the gateway provider and payment processor are different companies.

One company handles card processing, while another provides gateway technology and bills for that service.

Why Aren't Gateway Fees on My Processing Statement?

Your processing statement may show only charges collected by your processor.

If a separate gateway provider bills you directly, those charges may appear on another invoice or bank withdrawal.

Can Gateway Charges Continue After Switching Processors?

Yes. In some payment arrangements, the gateway agreement is separate from the processing contract.

Switching processors doesn't necessarily cancel your existing gateway subscription.

Can You Accidentally Pay for Two Gateways?

It's possible during a provider transition.

A business might activate a new gateway but continue paying for its previous gateway because the old contract remains active.

That doesn't automatically make either charge incorrect. It means the business should verify whether both services are needed.

How to Find Hidden Payment Gateway Fees

To find overlooked gateway charges, compare your processor statement, separate invoices, bank withdrawals, and merchant agreements.

The goal is to identify who charges you, what the fee covers, and whether you're still using that service.

Step 1: Review Your Processing Statement

Look for gateway, authorization, transaction, recurring service, and other payment-related fees.

Record each charge and the company collecting it.

Step 2: Check for Separate Gateway Invoices

Search your business email, accounting records, and payment dashboards.

Look for monthly subscriptions, transaction charges, and optional service fees.

Step 3: Match Recurring Bank Withdrawals

Review withdrawals from payment technology companies.

If a company name looks unfamiliar, verify it against your provider records before assuming the charge is unauthorized.

Step 4: Review Your Agreements

Compare the fees with your gateway and processing contracts.

Pay particular attention to contract renewals, cancellation requirements, and old gateway subscriptions.

Step 5: Calculate Your Combined Costs

Add the applicable payment-related fees for the same billing period.

Avoid counting any charge twice if it's already included in another statement total.

Example: Finding an Overlooked Gateway Charge

Suppose your business receives the following charges in one month:

Billing source	Amount	What to check
Processing statement	$600	Card processing charges
Gateway invoice	$25	Monthly gateway subscription
Gateway usage fees	$150	Transaction count and agreed rate
Previous gateway provider	$20	Whether the old service is still required

The processing and current gateway charges total $775.

If the previous gateway also bills $20, your total payment-related costs become $795.

That additional $20 is worth investigating, especially if you've already switched providers.

This example is fictional and demonstrates a billing review, not an actual merchant statement.

Gateway Fee Audit Checklist

Check processing statement charges
Find separate gateway invoices
Review recurring bank withdrawals
Identify old gateway subscriptions
Compare fees with merchant agreements
Calculate combined payment costs

Found an Unexpected Gateway Charge?

Ask the billing provider which service the charge covers and whether it's required under your agreement.

If the amount doesn't match your contract, request an explanation or correction.

Need help understanding your processing charges? Request a free POSNEXUS statement review.

A processing statement review is a useful starting point. Separate gateway invoices may need to be checked alongside it to understand your complete costs.

How to Calculate Your Effective Payment Processing Rate

Your effective processing rate shows the percentage of card sales spent on applicable payment-related fees.

Unlike an advertised transaction rate, it can account for separately billed gateway charges.

Effective Processing Rate Formula

Effective Rate (%) = (Total Payment Fees ÷ Total Card Sales Volume) × 100

Use fees and card sales from the same period.

Example: Calculating Your Actual Payment Costs

Suppose your business processes $20,000 in card sales during a month.

Monthly cost	Amount
Processing fees	$600
Gateway monthly fee	$25
Gateway transaction fees	$150
Total payment fees	$775

($775 ÷ $20,000) × 100 = 3.875%

Looking only at the $600 processing statement suggests a 3% rate.

Including the $175 gateway bill increases the combined effective rate to 3.875%, a difference of 0.875 percentage points.

This is an illustrative calculation, not a standard industry rate or POSNEXUS quote.

How Can You Reduce Payment Gateway Fees?

Reducing gateway costs starts with understanding which charges are necessary and whether your current arrangement still fits your business.

There isn't one pricing model that's cheapest for every merchant.

Review Unused Gateway Services

Check for inactive gateway accounts, unused features, and subscriptions left open after changing providers.

Confirm cancellation requirements before removing anything.

Compare Bundled and Separate Gateway Pricing

Some providers include gateway functionality in their processing plans.

Compare the total monthly cost of each option rather than assuming bundled pricing is always cheaper.

Ask About Available Pricing Options

Your provider may offer different rates or service packages depending on transaction volume and business needs.

Request a complete breakdown of recurring, transaction, and optional service charges.

Check Switching and Cancellation Costs

A lower monthly rate may not justify changing providers if cancellation or integration costs are substantial.

Calculate the likely total cost before switching.

Does Your Business Need a Separate Payment Gateway?

Not always. Some payment providers include gateway functionality in an all-in-one payment solution.

A separate gateway may be useful when a business needs particular integrations, recurring billing features, or more flexibility in choosing payment providers.

Do In-Person Payments Require a Separate Gateway?

Many modern POS systems and card terminals already include the technology needed to communicate payment requests securely.

Your business may not need a separate gateway contract for ordinary in-person transactions.

Online checkout, virtual terminals, and certain integrations may have different requirements.

What Happens to Stored Customer Cards When You Switch Gateways?

Some gateways use a customer vault to store payment credentials or tokens for future transactions.

Those stored credentials may not automatically move to another gateway.

Before switching, ask about secure credential migration, recurring billing continuity, and any contractual restrictions. This is especially important for subscription-based businesses.

What Should You Ask Before Choosing a Payment Gateway?

Before choosing a gateway, compare its complete costs, integrations, security features, billing arrangements, and contract terms.

Use these questions when evaluating a provider:

Are gateway fees included in processing charges or billed separately?
What monthly, transaction, setup, and optional service fees apply?
Which company will bill my business?
Will the gateway work with my website, POS, or virtual terminal?
What PCI DSS responsibilities and security features apply?
Can stored payment credentials be securely migrated if I switch?
What happens to my gateway contract if I change processors?
Are there cancellation fees or minimum commitments?

How Can POSNEXUS Help You Understand Your Gateway Fees?

Understanding your payment costs starts with knowing what you're paying and who is billing you.

POSNEXUS offers a free statement review to help businesses examine their payment processing charges.

Request a Free Statement Review

Your processing statement may not include every gateway-related expense.

Request a free POSNEXUS statement review to get a clearer picture of your processing charges and identify fees worth investigating.

If you receive separate gateway invoices, review them alongside your processing statement when calculating your combined costs.

Frequently Asked Questions About Payment Gateway Fees

What are payment gateway fees?

Payment gateway fees are charges for technology and related services that securely transmit payment information for authorization.

They may be monthly, transaction-based, or tied to optional services.

How much does a payment gateway cost per month?

Costs vary by provider and plan.

Some gateways charge monthly subscriptions, others charge per transaction, and some bundle gateway functionality with processing services.

Are gateway fees included in processing fees?

Sometimes. An all-in-one provider may include gateway services in its processing pricing.

A separate gateway company may bill additional charges.

Why am I getting two bills for card payments?

Your payment processor and gateway provider may be different companies.

Each can bill separately for the services it provides.

Are separate gateway charges considered double billing?

Not automatically.

Check whether the fees cover different services or whether you're paying for an unused subscription.

Can gateway fees continue after switching processors?

Yes. A separate gateway contract may remain active until canceled according to its terms.

Check your previous provider's billing records after switching.

Can payment gateway fees be negotiated?

Some providers may negotiate certain fees depending on transaction volume and contract terms.

Ask which charges can be adjusted and whether other costs would change.

How do I calculate my effective processing rate?

Divide your applicable payment-related fees by your card sales volume for the same period, then multiply by 100.

Include separately billed gateway fees when calculating your combined rate.

Final Thoughts: Know What You're Really Paying

Payment gateway fees may be bundled with processing costs, billed separately, or continue under an existing gateway agreement after you switch providers.

Reviewing your statements, invoices, contracts, and combined payment costs helps you understand the full picture.

Know who bills you, what each charge covers, and whether your business still needs the service.