You had a good month. Takings up, staff on top of things, nothing unusual on the floor. Then the statement arrives and the fee total has gone up by more than the sales did.
You check the contract. The rate is the same rate you signed. Nobody sent you a letter. Nothing was renegotiated. And yet the amount deducted last month, measured against what your customers actually paid you, is not the number you were quoted and not the number from two months ago either.
This is the single most common question merchants ask about card fees, and it has an answer that almost nobody gets told at the point of signing. Your rate was never really a rate. It was an estimate of a typical month, and no month is typical.
Here are the five things that move it, in the order you are most likely to run into them.
A quoted rate describes a hypothetical month
Your effective rate describes the one you actually had.
When a provider quotes you a percentage, they are pricing an assumption about the mix of cards your business will take. Local debit, local credit, a bit of premium, a little from overseas. That assumption gets averaged into one number and printed on your agreement.
Your customers then ignore the assumption entirely. They pay with whatever is in their wallet on the day, and every one of those cards carries a different underlying cost. The rate on the contract stays still. The cost of running your business through it does not.
What a year actually looks like
The same business, twelve months, one unchanged agreement. What was quoted stayed still. What it cost did not.
| Point in the year | What changed in the till | What the effective rate did |
|---|---|---|
| An ordinary month | Mostly local debit and credit, tapped in person. | Sits closest to the rate you were quoted. |
| A quiet month | Takings fall. Terminal rental, compliance charges and any monthly minimum do not. | Rises, because the same fixed charges are spread across less revenue. |
| Visitor season | A larger share of cards issued outside Singapore, carrying cross-border interchange. | Rises at the same time as your revenue, which is why the two figures appear to contradict each other. |
| Festive and year end | Corporate cards, company entertaining and premium gifting cards enter the mix. | Usually the highest point of the year. |
The shape matters more than the numbers. Costs drift above the quoted line almost every month, and the gap widens whenever the mix of cards in your till shifts away from ordinary local debit. If you have only ever looked at one statement, you have been reading a single point on a line.
The five things that move it
Each of these starts with what you noticed, because that is the order you experience them in.
Your fee went up but your sales did not
Your card mix moved. More of your customers reached for a rewards credit card than the month before, and fewer tapped a basic debit card. Interchange on a premium card is higher, so your blended cost rises even though your takings and your agreement are unchanged. Nothing was done to you. The mix simply shifted under your feet.
What to do. Look at the split between debit and credit before you look at anything else. If your provider cannot show you that split, that is the first thing to ask for.
The increase arrived in a busy tourist month
Overseas issued cards carry cross-border interchange. A card issued outside Singapore costs more to accept than the same card issued here, and Singapore does not cap interchange the way some markets do. A strong visitor month therefore raises your average cost per sale at exactly the moment your revenue looks healthiest, which is why the two figures so often move in opposite directions on your report.
What to do. Track your overseas card share month by month. Once you can see the pattern, you can plan for it rather than being surprised by it every year.
It climbed during a corporate or festive period
Company cards and premium gifting cards entered the mix. Corporate and commercial cards sit at the top end of the interchange scale. Year end entertaining, expense season, gift buying and B2B invoices settled by card all pull the same lever. A restaurant taking company dinners in December is running a different cost base from the same restaurant in February.
What to do. Separate your peak months from your ordinary ones when you review costs. Averaging them together hides both.
Your average sale value dropped
Fixed per transaction charges started to bite. Most schedules carry a fixed amount on every transaction alongside the percentage. On a large sale it disappears. On a small one it can quietly double your effective cost. Three hundred small baskets cost you far more in fixed charges than thirty large ones, even when the total takings are identical.
What to do. Divide your card volume by your transaction count. If your average basket is falling, your effective rate will rise whether or not anything else changes.
It spiked in your quietest month of the year
Fixed monthly charges landed against smaller revenue. Terminal rental, compliance charges and any monthly minimum stay exactly the same in a slow month. Spread across less revenue, they take a bigger percentage bite. Add one chargeback fee to a thin month and the distortion is sharper still.
What to do. Work out what your fixed charges cost you as a percentage of your worst month rather than your best. That is the number that matters when you compare providers.
What does not move
Worth knowing which parts of your bill are truly fixed, because it narrows the search considerably.
Interchange is set by the card networks and paid to the bank that issued your customer's card. Scheme fees are set by the networks. Your provider's own margin, whatever it is, was agreed when you signed and does not change by itself. Our guide to what Interchange++ pricing is walks through each of the three in more detail. Every provider operating in Singapore pays the same published interchange on exactly the same transaction. A large acquirer pays it. A small one pays it. Qashier pays it.
So when your effective rate moves and nothing has been added to your fee schedule, the movement is your card mix. That is not a fault to be fixed. It is information about who your customers are, and it is the only part of this that can actually tell you something useful.
One thing Singapore does differently
Some markets cap interchange by regulation, and several of those caps are themselves being rewritten. Singapore has no cap, so rates here are set commercially by the card networks. For businesses serving visitors or corporate cardholders, that makes seasonal swings in card mix more pronounced here than they would be in a capped market.
Regulatory position as at August 2026How to fix it
You cannot hold your effective rate still, and any offer that promises to is quietly charging you an average that protects the provider rather than you. What you can do is stop being surprised by it.
Start by tracking three numbers every month rather than one: your effective rate, your average sale value, and your split between debit and credit. Those three together explain almost every movement you will ever see. When the rate rises and all three have moved, you have your answer. When the rate rises and none of them have, something has been added to your bill and it is worth a phone call.
Then ask your provider for the breakdown behind the number. Some can produce it on request and some cannot, and which of the two you are dealing with tells you a great deal. A rate you can see moving is manageable. A rate that moves invisibly is not.
A moving number is fine. An invisible one is not.
See what is actually behind your monthly number
Ask us how the breakdown works and what your own figures would look like itemised. It takes one conversation, no documents, and there is no volume requirement before we will have it with you.
Ask about the breakdown behind your rateFrequently asked questions
Why does my card processing rate change every month?
Because your quoted rate applies to a hypothetical mix of transactions and your actual mix changes constantly. Interchange varies by card type, by where the card was issued and by how the payment was taken, so a month with more premium, corporate or overseas cards costs more than a month with mostly local debit. Fixed charges spread across different revenue totals move the figure further.
Is it normal for merchant fees to vary month to month?
Yes, and a completely flat effective rate across a year would be more unusual than a moving one. What matters is the size and direction of the movement. Small seasonal swings are expected. A steady climb over several months, with no change in how your customers pay, is worth a conversation with your provider.
What is card mix and why does it affect my fees?
Card mix is the proportion of your sales taken on each type of card: local debit, local credit, premium rewards, corporate and overseas issued. Each carries a different interchange cost, and interchange is usually the largest part of your rate. Two months with identical revenue and different card mixes will produce different fee totals.
Does a quiet month cost more per sale?
Often, yes. Terminal rental, compliance fees and any monthly minimum do not fall when your takings do, so they consume a larger share of a smaller month. This is why comparing providers on percentage alone can mislead you, and why it is worth calculating what a competing offer would cost you in your slowest month rather than your strongest.
Can I stop my card processing rate from moving?
Not entirely, and a fully fixed rate usually means you are paying an average that protects the provider rather than you. What you can do is see the movement. Once the components are visible you can tell the difference between a rate that moved because your customers changed and a rate that moved because something was added to your bill.
Which payment methods does QashierPay accept in Singapore?
QashierPay accepts Visa, Mastercard and AMEX, along with PayNow, GrabPay, ShopeePay, Atome and Alipay+ and other international e-wallets. In store card payments settle T+1. Qashier holds a Major Payment Institution licence from the Monetary Authority of Singapore.
Do I need to install an app to review my monthly fees?
No. QashierHQ runs in a web browser on any device, so your sales, fees and settlement records are available wherever you are. There is nothing to download and nothing to install.
Disclaimer
This article is general information about card payment costs and is not financial advice. The twelve month pattern above is illustrative and is not a Qashier rate quote. Interchange and scheme fees are set by the card networks and vary by card type, transaction channel and issuing country. Qashier is a Major Payment Institution licensed by the Monetary Authority of Singapore.