GMAP and What Merchants Should Expect in 2027
A Few Acronyms Worth Knowing First
Mastercard loves an acronym, and this announcement brought several new ones. You will see these throughout, so here they are up front.
GMAP is the Global Merchant Audit Program, a major overhaul to the chargeback and fraud monitoring framework.
ECM: Excessive Chargeback Merchant, the tier most merchants encounter first.
HECM: High Excessive Chargeback Merchant, sitting above ECM as the more serious designation.
EFM: Excessive Fraud Merchant.
HDM (new): High Dispute Merchant.
EDM (new): Excessive Dispute Merchant, which is the most severe of the dispute group.
What GMAP Means for Your Business
GMAP consolidates the programs that have monitored merchant chargeback performance for years. It was announced in a bulletin published on 28 July 2026 and becomes effective 1 April 2027.
If you are compliant under current Mastercard monitoring, do not disregard these changes. GMAP does two things that affect merchants directly. It lowers the chargeback ratio that puts you into monitoring, gradually, over several years. And it introduces new categories that measure more than just chargebacks.
Your Chargeback Threshold Is Coming Down
ECM is the tier most merchants run into first. To be identified, you need 100 or more chargebacks in a month combined with a chargeback ratio inside a defined band. Both conditions, at the same time.
That band is shrinking from the bottom:
| Year | Basis points | Percentage |
|---|---|---|
| 2027 and 2028 | 150 to 299 (no change) | 1.5 to 2.99 percent |
| 2029 | 130 to 299 | 1.3 percent and up |
| 2030 | 110 to 299 | 1.1 percent and up |
| 2031 | 90 to 299 | 0.9 percent and up |
HECM sits above that band at 300 or more chargebacks combined with 300 or more basis points, and it stays where it is.
Read that timeline again with your own numbers in mind.
The New Categories Watch More Than Chargebacks
This is where GMAP gets genuinely different from what came before.
HDM and EDM are two new merchant categories, and they measure something broader. Instead of counting chargebacks alone, they count transactions your acquirer reports as fraud to Mastercard’s Fraud and Loss Database, including fraud that never turned into a chargeback, plus non-fraud chargebacks. Your current-month figure gets divided by your sales count from the previous month.
Why does that matter to you? Because fraud that gets caught and refunded before a chargeback ever appears can still count toward these categories. Merchants who watch their chargeback ratio and nothing else may have no visibility into the number that actually triggers identification.
HDM requires at least five cleared transactions, $5,000 or more in combined fraud and non-fraud chargebacks, and 500 basis points, or 5 percent. EDM requires $10,000 and 5,000 basis points, or 50 percent. Those ratios sound enormous compared to ECM, and for most established merchants they are. But the activity floors are low. Five transactions is nothing. A small or newly launched operation with concentrated fraud could potentially meet these criteria on very little volume.
| Condition | High Dispute Merchant | Excessive Dispute Merchant |
|---|---|---|
| Cleared transactions | 5 or more | 5 or more |
| Fraud plus non-fraud chargebacks | $5,000 or more | $10,000 or more |
| Basis points | 500 or more (5 percent) | 5,000 or more (50 percent) |
All three conditions must be met in the same month for identification.
If You Sell Through a Platform or Marketplace
Chances are you already know whether this applies to you. If you accept payments through an online marketplace or selling platform rather than holding your own direct merchant account, this section matters.
Mastercard is changing how it identifies merchants for ECM, HECM, and EFM. Where a submerchant ID exists in the transaction data, that ID will be used instead of the shared merchant ID that groups many businesses together.
In plain terms, you have likely been measured as part of a crowd. Going forward, you get measured on your own. For most merchants that changes nothing. For anyone whose numbers have been quietly averaged out by better-performing neighbors under the same merchant ID, it could mean visibility you have not had before.
Worth checking with your provider before April 2027.
What This Could Cost You
Being identified under any of these categories brings monthly assessments, which are fines. These fines escalate the longer the situation continues.
HDM assessments start at $0 for the first six months, then climb to $5,000, $10,000, and eventually $25,000 monthly. EDM starts at $5,000 in month one and can reach $300,000 monthly if it goes unresolved.
EDM also carries a liability window that makes a merchant responsible for fraud-related chargebacks going back three months before identification and forward six months after.
Those early $0 months are not a free pass. The clock is already running underneath them, so a merchant that waits does not start over when the charges begin.
One more thing to understand about how this works. Mastercard bills its licensed customers, meaning acquirers and processors, so merchants generally see these charges arrive as pass-throughs under their merchant agreement rather than as a bill from the card network. Your agreement determines the specifics, and it is worth knowing what yours says before you ever need to.
Getting Out Is Harder Than Getting In
Once you cross a threshold, an audit opens and a monthly counter starts. To close that audit, you have to stay compliant with the applicable thresholds for three consecutive months. Not one good month. Three in a row.
Miss it, and the counter keeps advancing at the escalated rate. So a merchant who improves partway and then slips has effectively gained nothing while continuing to pay more each tier. Prevention is dramatically cheaper than remediation here.
Practical Steps to Take Before April 2027
Start with visibility. Ask your provider whether you can see fraud reports alongside chargebacks, since the new categories combine both. Most merchant reporting shows chargebacks only.
Then look at your trajectory. Take your current chargeback ratio and hold it against the 2029, 2030, and 2031 ECM thresholds. If you land inside any of them, you have a planning horizon rather than a problem, which is a much better place to be.
Finally, address the disputes upstream. Every threshold in GMAP measures outcomes you can influence. Clearer billing descriptors, faster customer service, early resolution of disputes before they become chargebacks, and structured representment on the cases worth challenging all move the numbers in the right direction. At the end of the day, the merchants who sail through 2031 will be the ones who started in 2026.
Ready to Get Ahead of GMAP?
You have time, and time is the advantage. If you would like help understanding where your business sits against the new GMAP categories, building visibility into combined fraud and chargeback performance, or putting automated resolution in place before the thresholds tighten, our team is here for exactly that. We work with merchants every day to reduce disputes, prevent chargebacks, and recover revenue that should never have been lost. Contact us and we will walk through your numbers with you.
GMAP Is Still Taking Shape
Mastercard has said the guidelines will be updated before the April 2027 effective date, and more detail is likely as acquirers work through implementation. We will update this piece as that information lands, so check back now and then to make sure you are working from the latest.
Why ChargebackHelp?
ChargebackHelp brings prevention, resolution, and recovery together into a single set of solutions built around your transaction data. DEFLECT shares order and fulfillment details with cardholders and issuers at the point of inquiry through Verifi Order Insight and Ethoca Consumer Clarity, clearing up confusion before it becomes a dispute. RESOLVE consolidates alerts from Verifi CDRN, Ethoca Alerts, and Visa RDR so you can refund eligible cases before they turn into chargebacks. RECOVER automates representment to reclaim revenue from chargebacks worth fighting. The result is fewer disputes, lower chargeback ratios, and a merchant account that stays well clear of network monitoring thresholds as those thresholds continue to tighten.
FAQs: GMAP and What Merchants Should Expect
What is GMAP?
GMAP is Mastercard’s Global Merchant Audit Program, a new framework for monitoring merchant fraud and chargeback performance that takes effect on 1 April 2027. It replaces the previous monitoring program, keeps the existing ECM, HECM, and EFM categories, and adds new ones that measure fraud reports alongside chargebacks. ChargebackHelp can help you understand where your business stands against each of them.
When do the new chargeback thresholds start?
GMAP itself begins 1 April 2027, but the ECM threshold reductions come later. The band tightens in January 2029, again in January 2030, and once more in January 2031, dropping from 150 basis points to 90 over that period.
Will my chargeback ratio still be calculated the same way?
For ECM and HECM, yes. Mastercard divides your chargeback count for the month by your sales count from the previous month. The new HDM and EDM categories use a broader calculation that adds reported fraud into the numerator, which is why chargeback reporting alone will not show you the full picture.
Do these fines come from Mastercard directly?
Typically no. Mastercard bills its licensed customers, so assessments generally reach merchants as pass-through charges under their merchant agreement. Your specific terms govern how that works, and reviewing them before April 2027 is a sensible step.
I sell through a platform. Does GMAP affect me differently?
It might. Mastercard will begin identifying merchants by submerchant ID where one exists, so your performance will be evaluated individually rather than blended with other businesses under a shared merchant ID. Ask your provider how you are currently identified, and our team can help you assess what changes.
What is the fastest way to lower my chargeback ratio?
Resolving disputes before they escalate into chargebacks usually produces the quickest improvement, since a refunded alert never becomes a chargeback at all. Clearer billing descriptors and responsive customer service help upstream. RESOLVE and DEFLECT are built specifically for this, and we can have you set up quickly.
Should I be worried if my numbers are fine today?
Not worried, but aware. The thresholds are moving toward you rather than staying still, so a ratio that looks comfortable in 2026 may sit much closer to the line by 2031. Reviewing your trajectory now gives you years of runway instead of a scramble later.
