How do interest-free months work in Mexico?

Discover in this article how interest-free months work, their benefits and why they are key to the success of your business.

What are interest-free months?

Interest-free months (MSI) are a promotional method offered by credit cards that allow people to obtain products or services by paying in fixed monthlyinstallments, without generating additional interest.

This financial tool has become very popular in Latin America, especially in Mexico, by encouraging consumption, increasing conversion and reducing purchase friction, which is very attractive especially for e-commerce, retail and sectors such as Edtech.

How do interest-free months work?

When you make a purchase with interest-free months, the total amount of the product or service is divided into established monthly installments (such as 3, 6, 12 or more months). Each installment is paid in the agreed term until the total amount of your purchase is paid in full.

For example, if a customer purchases a personal finance course for $1,200 MXN in 12 months interest-free, he will pay $100 MXN each month, with no extra charges.

Steps to buy with interest free months

To make a purchase at months without interest, follow this process: 

• Step 1: verify that your credit card has the option to pay in months without interest.
• Step 2: choose a merchant that is affiliated with a financial institution that accepts payment in months without interest. 
• Step 3: Select the number of months you wish to divide your payment into, usually 3, 6, 9 or 12 months. 
• Step 4: make the purchase and wait for authorization from the issuing bank to make the down payment.
• Step 5: Comply with the agreed payment terms to avoid penalties that affect your credit history. 

The consumer only makes a minimum monthly payment, but the total amount of the purchase will be taken into account from the credit line of the card. In other words, it affects the credit limit.

In which sectors and contexts can interest-free months be applied?

Interest-free months make products and services more accessible in different sectors and at different times of purchase:

• Retail: Department stores, supermarkets and specialty retailers often offer MSI on electronics, clothing, furniture and more.
• Health and medical services: clinics, doctors' offices and laboratories use fixed fees to pay for procedures and treatments.
• Education and training: tuition, registration fees and courses can be paid on a deferred basis.
• Tourism: travel agencies, hotels and airlines apply MSI on reservations and packages.
• Automotive: down payments, services and car or accessory purchases are facilitated on a monthly basis.
• Technology: MSI encourages the purchase of computers, gadgets and smartphones.

Likewise, interest-free months can be applied in various contexts, allowing consumers to take advantage of them at specific times, such as: 

• Promotions and special campaigns: events such as Buen Fin, Hot Sale and holiday seasons.
• Banking or temporary alliances: only with certain cards or for promotional periods.
• Online and in-store shopping: increasing the variety of uses.
• High-value purchases: ideal for high-investment products such as home appliances or medical treatments.

What are the advantages for companies to sell on interest-free months?

Selling on interest-free months provides companies with strategic advantages that impact their sales and competitiveness. This can be a decisive factor. The main benefits are detailed below:

Increase in sales

By facilitating the purchase of products and services interest-free, one of the main barriers to purchase, which is the ability to pay immediately, is eliminated. This motivates more customers to make their purchases, which generates an increase in sales volume.

Increase in average ticket

Customers often take advantage of interest-free months to access higher-value products or goods, since payment is divided into installments. This increases the average value per transaction and encourages the consumption of high-value goods and services.

Promoting competitiveness

Interest-free monthly payments allow companies to stand out in the market and attract new customers who value payment facilities. 

Customer loyalty

By providing flexible payment solutions, merchants improve the shopping experience and strengthen the relationship with their customers. This drives loyalty and repurchase, which are key to sustained growth. 

Immediate settlement of the total cost

In most cases, through agreements with the bank or payment gateway, the merchant receives the full amount of the sale from the beginning, while the customer pays the minimum amount in monthly installments. This means greater liquidity and reduced collection risk for the company.

These advantages provide the ideal context for businesses to take advantage of solutions such as Rebill, a payment platform that promotes the integration and management of MSI across multiple channels, further enhancing the growth and professionalism of your business.

Conditions to be met by businesses to apply interest-free months

Although in Mexico there is no specific regulation governing interest-free months, there are some conditions that companies should consider, among which are:

1. Formal agreements with banks or issuers: it is essential for retailers to establish agreements with financial institutions, TDC issuers or payment platforms to offer interest-free months.
2. Adequate technical infrastructure: the company must have a point-of-sale terminal (POS) or an online platform compatible with MSI payment methods. 
3. Legal compliance: retailers must comply with the Federal Consumer Protection Law and PROFECO regulations, which implies informing about promotions, terms, conditions, minimum amounts, commissions and restrictions.
4. Clear information to consumers: the customer must be provided with information on the total price and the price in months without interest, the number and frequency of installments, possible extra charges, etc. All this must be communicated prior to the time of purchase.
5. Staff training: the customer service team must be trained to correctly explain the operation of MSIs, resolve doubts and handle incidents or clarifications from consumers.
6. Financial evaluation and profitability: the company must analyze bank or payment platform fees, administrative costs and profit margin. Offering MSI implies assuming certain charges, so it is important to know the financial viability and not affect the financial health of the business.
7. Fiscal documentation and requirements: banks or payment processors usually request fiscal and legal documentation to formalize the MSI agreement, such as identification, RFC, tax receipt and financial statements.

How do the payment platforms work at MSI?

To offer interest-free months, merchants must enable this function through a specialized payment platform or through direct agreements with credit card issuing banks. 

The platform is in charge of processing the transaction, deducting the corresponding commissions and coordinating with the bank the monthly payments that are reflected in the customer's card.

The process is simple and safe:

• The business integrates its system(e-commerce or POS) with the selected platform or payment gateway.
• An agreement is established to enable MSI with participating cards.
• The customer chooses to pay MSI and selects the desired term.
• The platform settles the total amount to the merchant (minus commissions).
• The bank charges its customer for the outstanding balance of its available credit on a monthly basis until payment is completed.

It should be noted that not all platforms offer MSI automatically, some require manual activation or meet specific conditions.

Rebill makes it easy for companies to provide interest-free payment options automatically, managing total merchant collection, bank coordination and transaction security, all conveniently integrated into your system.

Sell more by giving your customers what they want: interest-free monthly payments. Find out how to activate them safely without losing profitability with Rebill,talk to us and we'll tell you how!

MSI for foreign companies: when it is appropriate to offer it

In Mexico, interest-free months (MSI) are not just a "promotion." For many companies, they are a conversion lever that changes the commercial result in medium and high tickets. The key is to decide when to offer MSI and with what rules so as not to compromise net income or complicate operations.

Which ticket types and categories tend to benefit the most?

In practical terms, MSI tends to have a greater impact when the customer compares alternatives and the "cash" price creates friction. In these scenarios, MSI lowers the barrier to entry without necessarily requiring a direct discount. On the other hand, for low ticket prices, the marginal benefit is usually lower, and sometimes it is better to prioritize the payment and approval experience.

MSI vs discount vs interest payments: how to decide

To make an informed decision, it is advisable to compare three options: (1) offer MSI, (2) offer a discount for immediate payment, or (3) offer installments with interest. The right decision depends on the margin, the financial cost, the elasticity of demand, and whether your operation can measure the actual net per transaction. If you cannot measure the net per method and per plan, it is easy to optimize conversion at the expense of the margin.

Financial impact: net real, commissions, and settlement

The typical mistake is to evaluate MSI solely on the basis of conversion. In reality, MSI changes the financial structure: commissions, financing costs, settlement times, and differences in method. For a company that sells in Mexico (particularly if it operates from abroad), the focus should be on net income and cash timing.

Which metrics to look at (and why)

• Net per transaction: amount charged minus commissions and costs associated with MSI.
• Effective financial cost: how much it "costs" to offer MSI vs. alternatives (discount, interest, etc.).
• Settlement times: when the money becomes available and how it impacts your cash flow.
• Net per cohort: if there is recurrence, measure whether MSI changes retention or repurchase behavior.

How to avoid decisions that improve conversion but worsen cash flow

A simple rule: if MSI improves conversion but leaves you with less net profit or pays you later, your "real" CAC goes up and your cash flow becomes strained. Therefore, before scaling campaigns with MSI, it is advisable to simulate scenarios: expected incremental conversion, financial cost, commissions, and payment timing. The goal is not to avoid MSI, but to use it with clear rules.

Reconciliation and reporting: how to avoid operational friction

When MSI begins to represent a significant portion of the volume, the operation can become fragile if you don't have robust reconciliation. What usually fails is not the collection itself, but traceability: identifying what was collected, in how many months, what fees were applied, and when it was settled.

What to record per transaction (minimum viable)

• Order or invoice ID (internal reference)
• Amount, currency, and method
• MSI plan (number of months) and conditions
• Fees and costs associated with the plan
• Expected net and settled net
• Settlement date and payment statuses

How to use MSI without duplicating work in finance and support

In practice, MSI scales well when finance can reconcile with consistent data and support can respond to claims without relying on manual searches. If each adjustment requires researching different screenshots or reports, the operating cost increases with volume. Therefore, in addition to offering MSI, it is advisable to ensure the reporting layer from the outset: net per plan, differences per method, and traceability per transaction.