TDR and MDR Explained: A Complete Guide for Indian Businesses

Highlights:

• Learn what TDR and MDR mean and how they affect the amount you receive from each transaction.
• Discover the three key components of transaction fees: interchange, network charges, and processor markup.
• Learn about hidden costs like compliance expenses, taxes, and operational inefficiencies that impact cash flow.

Introduction

Every online payment comes with a cost. Whether you are running an e-commerce store, a SaaS platform, or a small business accepting UPI and card payments, understanding payment gateway charges is essential. Two terms often confuse merchants: TDR and MDR. They sound similar, but they are not the same.

If you are trying to optimise your payment costs or choose the right gateway, knowing the difference can directly impact your margins. This guide breaks down TDR payment gateway charges and Merchant Discount Rate in India in a simple, practical way.

What TDR and MDR Actually Mean

Understanding these two terms starts with a simple idea: both are fees deducted from your payment before it reaches your bank account. But they differ in scope and who charges them.

What Is MDR (Merchant Discount Rate)?

Merchant Discount Rate (MDR) is the fee a merchant pays to banks and payment service providers for processing digital payments, especially card transactions.

• It is charged when customers pay via credit cards, debit cards, or similar digital modes
• It is deducted before the money is settled with the merchant
• It is usually expressed as a percentage of the transaction value

Example: If MDR is 2% on ₹1,000, the merchant receives ₹980.

According to institutional and regulatory explanations, MDR is:

• “a fee that a merchant pays to their bank for accepting payments via digital means”
• “charged as a percentage of each transaction processed”

It is also shared among multiple entities:

• Issuing bank (customer’s bank)
• Acquiring bank (merchant’s bank)
• Card networks like Visa, Mastercard, and RuPay
• Payment processors

What Is TDR (Transaction Discount Rate / Total Discount Rate)?

TDR (Transaction Discount Rate) is the total fee charged on a transaction by the payment gateway or payment processor.

• It represents the final amount deducted from the transaction
• It includes MDR plus other charges such as gateway fees and processing costs
• It is also expressed as a percentage of the transaction value

Industry and institutional explanations note:

• TDR is the percentage fee deducted from every successful transaction by the payment gateway
• It often includes multiple cost components like interchange fees, network charges, and gateway fees

How TDR/MDR is Calculated: The Three-Component Breakdown

The Merchant Discount Rate (MDR) or Transaction Discount Rate (TDR) is a fee charged to merchants for processing electronic payments (credit cards, debit cards, UPI). It is typically calculated as a percentage of the transaction amount, ranging from 1% to 3%.

This rate is broken down into three core components that represent the cost of the transaction journey.

The Three-Component Breakdown

1. Interchange Fee (Largest Portion): Paid to the card-issuing bank (e.g., the bank that issued the customer's credit card). This fee covers the risks and processing costs of the bank, making up about 70-80% of the total MDR.
2. Card Network Fee (Assessment Fee): Paid to the card network (e.g., Visa, Mastercard, RuPay, NPCI). This fee is for using their network infrastructure to connect the merchant bank to the issuing bank.
3. Acquirer Markup (Processor Fee): Retained by the acquiring bank or the payment processor/gateway. This fee covers the cost of terminal installation, payment processing, fraud protection, and customer service.

How TDR/MDR is Calculated

MDR is calculated by multiplying the transaction amount by the negotiated MDR percentage.

MDR Amount = Transaction Amount * MDR percentage

Calculation Example

If a customer makes a purchase of ₹5,000 at a 2% MDR:

Total MDR Charged: 5000*2% = 100

Merchant Settlement: 5000-100 = 4900

Note: In India, a GST of 18% is also applicable on the MDR fee amount (18% of ₹100 = ₹18), making the total cost to the merchant ₹118.

Hidden Costs: GST and Actual Payment Expenses

Hidden GST and payment costs, often overlooked, significantly inflate final transactions, including 18% tax on service fees (e.g., loan processing, bank charges), compliance costs for businesses, and cash flow strain. These hidden expenses can arise from non-refundable fees, manual invoicing errors, and penalties for non-compliance.

Hidden GST and Payment Expenses

• Service Charge Taxes: Financial services, such as personal loan processing fees, often incur an additional 18% GST on top of the fee amount, such as on a ₹30,000 fee, adding ₹5,400 in tax.
  Compliance and Operational Costs: Businesses incur high costs for GST-compliant software, training, and hiring tax professionals to manage regular filings.
  Cash Flow Disruption: GST is payable upon invoicing, not payment receipt, leading to working capital issues.
• Transaction Fees: Digital payments or third-party facilitators add hidden charges that often include GST.
• Penalties: Late filing, incorrect input tax credit (ITC) claims, or missed e-invoices trigger significant penalties, with interest at 18% per annum.

Impact on Actual Payment

• Increased Transaction Value: What appears to be a flat fee, such as in real estate or service contracts, often has embedded GST (e.g., 18% on fees), significantly raising the total cash outflow.
• Administrative Expenses: Manual reconciliation and managing non-compliance issues increase administrative burdens.

How to Mitigate

• Ensure accurate and timely filing of GSTR-2B to avoid penalties.
• Request a detailed, itemised invoice to identify extra fees and GST charges.
• Utilise automated GST reconciliation software to reduce manual errors and costs.

Key Takeaways for Online Merchants

TDR and MDR are identical charges under different names—understand component breakdown to negotiate effectively. Interchange fees (70-80% of total) are non-negotiable; focus negotiation on gateway markup. UPI's zero MDR advantage saves D2C brands ₹6-12 lakh annually on ₹50 lakh monthly revenue, though policy changes may introduce charges for large merchants. Factor 18% GST on gateway fees into cash flow planning—actual costs exceed quoted rates by 0.5-1%. RBI prohibits passing MDR to customers, requiring you to absorb charges in product pricing and margin calculations.

FAQs

1. What is the difference between TDR and MDR in payment gateways?

TDR and MDR are the same charge. TDR is industry terminology used by payment gateways; MDR is RBI's regulatory term. Both refer to merchant transaction fees covering interchange, network charges, and gateway costs.

2. How is TDR/MDR calculated on a transaction?

MDR comprises three components: interchange fee (70-80%, paid to issuing bank), network assessment fee (0.1-0.15%, paid to Visa/Mastercard), and gateway markup (covers technology, fraud detection, support). Total typically ranges 0.4-2.2% depending on payment method and business category.

3. Is MDR charged on UPI transactions in India?

No. Since January 2020, UPI transactions have had zero MDR under the Payments and Settlement Systems Act amendment. The government provides 0.15% incentive to banks for small merchant UPI transactions up to ₹2,000, subsidising the payment ecosystem without merchant charges.

4. Can merchants pass MDR charges to customers?

No. RBI prohibits merchants from passing MDR charges to customers for debit card payments since January 2018. You must absorb TDR as a business cost and cannot add surcharges or convenience fees at checkout for regulated payment methods.

5. What is the MDR rate for credit card transactions?

Credit card MDR ranges from 0.7% (education, utilities, government payments) to 2.2% (e-commerce, donations, high-risk categories). Rates are market-driven, set by payment service providers, varying by business category due to differential chargeback risk and interchange costs.