Introduction
Installment sales contracts in Turkey are a major part of daily consumer life. Consumers frequently buy furniture, electronics, white goods, mobile phones, computers, home appliances, education packages, beauty services, medical packages, vehicle accessories, household products, and many other goods or services by paying the price in parts rather than in one payment.
For consumers, installment sales create financial flexibility. For sellers, they create easier sales and larger transaction volume. However, installment contracts also create legal risks. A consumer may not receive a written contract, may not be informed about the total price, may be charged hidden fees, may want to withdraw from the contract, may face unfair acceleration of all remaining installments, may pay early but not receive a discount, or may discover that the product is defective after several installments have already been paid.
Turkish law regulates installment sales contracts mainly under Law No. 6502 on the Protection of Consumers and the Regulation on Installment Sales Contracts. The Ministry of Trade defines an installment sales contract as a contract where the seller or provider undertakes to deliver goods or perform services, and the consumer pays the price in parts. The same guidance also states that these rules apply to financial leasing contracts where the consumer is obliged to acquire ownership of a good at the end of the lease period, while installment sales rules do not apply to purchases made by credit card.
This article explains the legal structure of installment sales contracts in Turkey, the consumer’s right of withdrawal, seller obligations, early payment rights, default and acceleration clauses, defective goods and services, evidence, and legal remedies before Consumer Arbitration Committees and Consumer Courts.
What Is an Installment Sales Contract?
An installment sales contract is a consumer contract where the seller or provider delivers goods or performs services, while the consumer pays the price in installments. The defining feature is not only that payment is delayed, but that the price is divided into parts and paid over time.
For example, a consumer buying a washing machine for 12 monthly payments, a sofa set for 10 installments, a training package for 6 installments, or a household appliance bundle under a written payment plan may be entering into an installment sales contract.
However, credit card installment purchases are treated differently. Ministry guidance expressly states that installment sales contract provisions do not apply to purchases made by credit card. This distinction matters because credit card transactions involve the card issuer, payment system, and card agreement, while a classic installment sales contract is directly between the consumer and the seller or provider.
An installment sales contract should also be distinguished from a consumer credit contract. In consumer credit, a bank or lender finances the purchase and the consumer repays the credit. In installment sales, the seller or provider generally allows the consumer to pay the sale price over time. The legal consequences may differ, especially regarding withdrawal periods, early payment, interest, and linked credit responsibility.
Written Contract Requirement
One of the most important rules is the written form requirement. The Ministry of Trade states that installment sales contracts must be established in writing, and a copy of the contract must be given to the consumer on paper or through a durable medium. If the consumer later requests a copy, the seller or provider must provide one copy free of charge for one time.
The contract must also be prepared in at least 12-point font, in clear, simple, understandable, and readable language. If the seller or provider fails to create a valid written contract, it cannot later rely on the invalidity of the contract against the consumer.
This is a strong consumer protection rule. A seller cannot avoid its obligations by saying, “There is no written contract, so the consumer has no rights.” If the seller failed to comply with formal requirements, that failure cannot be used to harm the consumer.
For consumers, the written contract is essential evidence. It should identify the product or service, cash price, installment price, down payment, number of installments, payment dates, interest or additional costs if any, withdrawal rights, default consequences, delivery or service date, and seller identity.
Mandatory Clarity in Contract Terms
Installment contracts often involve financial details. If these details are unclear, the consumer may not understand the real cost. Therefore, a legally sound installment contract should be transparent.
The contract should clearly state:
The identity and contact details of the seller or provider
The identity of the consumer
The goods or services subject to the contract
The cash sales price
The installment price, if different
The number and amount of installments
Payment dates
Any interest, commission, tax, fee, or additional cost
Delivery or performance date
Right of withdrawal
Early payment consequences
Default and acceleration terms
Remedies in case of defective goods or services
Dispute resolution routes
A vague payment table or oral explanation is not enough. The consumer should know exactly how much will be paid, when it will be paid, and what happens if payment is delayed.
The Consumer’s Seven-Day Right of Withdrawal
In installment sales contracts, the consumer has a statutory right of withdrawal. The Ministry of Trade states that consumers may withdraw from installment sales contracts within seven days without giving any reason and without paying a penalty. For service contracts, the period begins on the date the contract is established; for goods, it begins when the consumer or a third person designated by the consumer receives the goods.
This is different from the 14-day withdrawal period used in many distance contracts. Installment sales contracts have their own seven-day withdrawal rule. If the installment sale was also made online or remotely, distance contract rules may need separate analysis, but the installment sales framework must not be ignored.
The withdrawal notice must be sent to the seller or provider within the withdrawal period in writing or through a durable medium. A durable medium may include email, SMS, written platform message, or other recordable method that allows the consumer to prove the notice.
A consumer who wants to withdraw should not rely only on a phone call. Written proof is critical.
Limits on Withdrawal: Ordinary Inspection vs. Ordinary Use
The right of withdrawal in installment sales is not unlimited. If the seller delivered the goods during the withdrawal period, the consumer may use the goods only to the extent required for ordinary inspection. Ministry guidance states that if the consumer uses the goods beyond ordinary inspection and in the usual manner, the consumer cannot exercise the withdrawal right.
This distinction is important. A consumer may inspect a product to understand what was delivered. But if the consumer starts using it as an ordinary owner, withdrawal may be lost.
For example, checking whether a product was delivered in the correct model may be ordinary inspection. But using a household appliance for several days, installing and actively using an electronic device, or using a product in a way that reduces its second-hand value may exceed ordinary inspection depending on the facts.
For services, withdrawal may also be unavailable where service performance begins before the withdrawal period ends with the consumer’s approval. This issue is especially important for education, beauty, repair, maintenance, and training services sold in installments.
Seller’s Obligations After Withdrawal
If the consumer validly withdraws from the installment sales contract, the seller or provider must act quickly. Ministry guidance states that the seller or provider must return the amount received and all documents that put the consumer under debt within seven days from receiving the withdrawal notice, without imposing any cost on the consumer.
This rule is highly practical. If the consumer signed promissory notes, payment undertakings, installment documents, or other debt instruments, the seller must return them. The seller cannot keep the documents and later try to collect installments after withdrawal.
The refund should also be real repayment, not store credit unless the consumer freely accepts that option. If the consumer paid a down payment or initial installment, it must be returned within the legal period.
Consumer’s Obligations After Withdrawal
The consumer also has obligations after withdrawal. Ministry guidance states that the consumer must return the goods to the seller within seven days from exercising the right of withdrawal; otherwise, the consumer is deemed not to have exercised the withdrawal right. Unless otherwise agreed by the parties, the consumer bears return costs such as transportation when withdrawal is used.
This rule should be handled carefully. The consumer should return the product through a provable method and preserve cargo receipts, delivery records, photos, and written communication. If the product is large, such as furniture or white goods, the consumer should request written return instructions from the seller.
If the seller refuses to accept the return or does not provide a reasonable return address, the consumer should document the refusal.
Installment Sales and Defective Goods
Withdrawal from an installment sales contract is different from defective goods rights. The seven-day withdrawal period allows the consumer to cancel without reason within a short period. Defective goods rights may apply where the product is faulty, damaged, non-original, incomplete, unsafe, different from the model, or not as advertised.
Under Turkish consumer guidance, if a product is defective, the consumer may choose among refund by withdrawing from the contract, replacement with a defect-free equivalent, free repair, or price reduction. The seller must fulfill the consumer’s chosen remedy where legal conditions are met. Defects appearing within six months from delivery are presumed to have existed at delivery unless the nature of the product or defect makes that inappropriate.
Therefore, a seller cannot reject every complaint by saying, “The seven-day withdrawal period has expired.” If the product is defective, the consumer may still have legal remedies.
For example, if a refrigerator bought in 12 installments stops cooling after one month, the consumer’s defective goods rights should be examined. If a sofa set delivered under an installment contract has structural defects, the consumer may request replacement, refund, repair, or price reduction depending on the facts.
Installment Sales and Defective Services
Installment sales may also involve services. A consumer may purchase an education package, repair service, beauty service, sports program, or other service by paying in installments. If the service is not performed properly, defective service rules may apply.
A defective service may include incomplete performance, delayed service, failure to provide promised sessions, poor workmanship, or material difference from the advertised service. The consumer may request re-performance, free correction, price reduction, or rescission from the contract where legal conditions are met.
This is especially important where a provider sells a long-term package in installments and then fails to perform. For example, a private course may promise 120 hours of training but provide only part of it. A beauty center may sell a 10-session package but refuse appointments. A repair provider may charge installments but fail to repair the product. In these cases, the consumer may have both installment contract arguments and defective service remedies.
Early Payment Rights
A consumer may want to pay installments early. Early payment may occur because the consumer wants to close the debt, avoid future payment risk, or obtain a discount. Installment sales rules generally protect the consumer against paying future interest or cost for a period not used.
If the installment price includes interest, financing cost, or similar charges, early payment should lead to an appropriate reduction for the unpaid future period. Sellers should calculate this transparently and should not demand the full installment total where early payment legally requires a discount.
A proper early payment calculation should identify the unpaid principal, any financing component, payment date, remaining installment period, and reduction amount. The seller should provide a written calculation upon request.
For consumers, early payment should always be documented. The payment receipt should state that the debt is closed, and the seller should return any debt instruments or issue a written release.
Default in Installment Payments
Default occurs when the consumer fails to pay installments on time. Sellers often react by demanding all remaining installments immediately. However, Turkish Consumer Law limits when this is possible.
The Ministry of Trade states that if the seller or provider has reserved the right to demand all remaining debt in case of consumer default, this right can be used only if the seller or provider has performed all its obligations and if the consumer defaults on at least two consecutive installments that constitute at least one-tenth of the contract price, or one installment that constitutes at least one-fourth of the contract price. The seller or provider must also give the consumer at least 30 days by written notice or durable medium before using the acceleration right. Interest, commission, and similar costs are not considered in calculating the accelerated installments.
This rule is extremely important. A seller cannot automatically accelerate the whole debt after one small delayed installment unless the legal conditions are satisfied. The contract must reserve the acceleration right, the seller must have performed its obligations, the default must meet the legal threshold, and the consumer must receive a written acceleration warning giving at least 30 days.
The 2022 Consumer-Friendly Default Amendment
The Ministry of Trade announced that amendments introduced by Law No. 7392 strengthened consumer protection in installment sales default. The change replaced a calculation based on “remaining debt” with one based on the “contract price,” making it harder for sellers to demand all remaining debt too early and aligning the rule more closely with the Turkish Code of Obligations.
This amendment is important for practice. It prevents a seller from accelerating the entire balance too easily when the consumer experiences temporary payment difficulty. Sellers must carefully calculate whether the default threshold is met.
For consumers, this means that acceleration letters should be reviewed. If the warning does not give at least 30 days, if the thresholds are not met, if the seller has not delivered the goods or performed the service, or if the calculation includes interest and fees improperly, the acceleration demand may be challenged.
Acceleration Clauses and Unfair Terms
An acceleration clause allows the seller to demand all remaining installments if the consumer defaults. Such clauses are not automatically invalid, but they must comply with mandatory consumer law.
Potentially problematic clauses include:
The entire debt becomes due after one late installment.
The seller may accelerate without written notice.
The consumer is given less than 30 days.
Acceleration applies even before the seller delivers the product.
Interest, commission, or penalty is included in the acceleration calculation contrary to legal limits.
The seller may keep all payments and repossess the goods without fair accounting.
A standard contract clause cannot override mandatory consumer protection. If the clause is more burdensome than the law allows, the consumer may challenge it.
Promissory Notes and Debt Instruments
Installment sales sometimes involve promissory notes or other debt instruments. This creates serious legal risk for consumers. If a consumer signs negotiable instruments, the seller may try to enforce them even where the underlying consumer contract is disputed.
Because Ministry guidance states that upon withdrawal the seller must return all documents that put the consumer under debt within seven days, debt instruments are highly relevant in installment sales. Consumers should avoid signing blank promissory notes or instruments that are not clearly linked to the installment contract.
If promissory notes are used, each note should match a specific installment amount and maturity date. The consumer should keep copies. If the consumer withdraws, cancels, or pays early, the notes should be returned or cancelled in writing.
Delivery and Installment Sales
A seller cannot demand harsh default consequences while failing to perform its own obligations. Under the installment sales acceleration rule, the seller or provider must have performed all its obligations before demanding all remaining installments because of default.
This is especially important where the product has not been delivered, delivery is delayed, or the service has not started. If the seller has not delivered the goods, it should not be able to accelerate the entire debt merely because the consumer delayed payment.
If an installment sale is also made online or by phone, distance sales delivery rules may become relevant. Ministry guidance states that in internet or telephone sales, if no delivery period is promised, the seller must send the goods within 30 days at the latest; if the goods are not sent within that period, the consumer may terminate the contract and receive all payments back with legal interest within 14 days. Lack of stock is not accepted as impossibility.
Additional Fees and Hidden Charges
Installment sales contracts must be financially transparent. The consumer should know the total installment price and any additional costs before signing.
Hidden charges may include file fees, service fees, delivery charges, installation fees, insurance, handling fees, collection fees, late payment penalties, or administrative costs. Some costs may be lawful if clearly disclosed and legally valid, but vague or undisclosed fees may be challenged.
If the installment sale is made through distance communication, additional payment rules may also apply. In distance contracts, any additional payment beyond the agreed main price requires explicit consumer approval before contract formation; if paid options are pre-selected and the consumer pays because of default selection, the amount must be refunded immediately by the seller/provider or by the intermediary service provider if it collected payment on their behalf.
Installment Sales and Online Marketplaces
Installment sales may occur through online platforms, but careful classification is required. Credit card installments are not governed by installment sales contract rules. However, a seller may offer its own installment plan or deferred payment structure outside credit card systems.
If the contract is made online, the consumer may also have distance contract rights, including pre-contractual information, delivery rules, withdrawal rules, and additional payment protections. But the exact withdrawal period and exceptions may depend on the legal classification of the contract.
Consumers should preserve screenshots of the product page, payment plan, seller identity, installment schedule, distance sales agreement, preliminary information form, invoice, and communications.
Sellers should clearly identify whether the transaction is a credit card installment, consumer credit, seller-financed installment sale, subscription, or another structure.
Evidence in Installment Sales Disputes
Evidence is critical. Consumers should preserve:
Installment sales contract
Payment plan
Invoice or receipt
Delivery documents
Warranty certificate
Promissory notes or debt instruments
Copies of all signed documents
Withdrawal notice
Seller’s refund response
Early payment calculation
Default warning letter
Acceleration notice
Payment receipts
Bank transfer records
Product photos and videos
Service records
Defective goods or service reports
WhatsApp, email, SMS, and platform messages
Advertisements and price offers
A strong legal claim should be chronological: contract date, goods or service promised, total price, installment plan, payments made, delivery or performance status, dispute event, notice sent, seller response, and requested remedy.
How to Draft a Withdrawal Notice
A consumer who wants to withdraw within the seven-day period should send a clear written notice. A practical structure may be:
“I entered into an installment sales contract with your company on [date] regarding [product/service]. I hereby exercise my statutory right of withdrawal within seven days, without giving any reason and without accepting any penalty. I request refund of all amounts paid and return/cancellation of all documents placing me under debt within seven days from receipt of this notice.”
If the goods were delivered, the consumer should ask for return instructions and should return the goods within the legal period. If the seller refuses to accept return, the refusal should be documented.
How to Object to Acceleration of Installments
If the seller demands all remaining installments, the consumer should review whether the legal conditions are met. A practical objection may state:
“I object to your acceleration demand. The legal conditions for acceleration have not been met because [the seller has not performed all obligations / the alleged default does not meet the statutory threshold / no valid 30-day written acceleration warning was served / the calculation improperly includes interest, commission, or similar costs]. I request withdrawal of the acceleration demand and correction of the payment plan.”
The consumer should attach payment receipts, delivery records, and any relevant correspondence.
Consumer Arbitration Committees
Installment sales disputes often involve payment amounts within the Consumer Arbitration Committee threshold. For 2026, disputes below TRY 186,000 must be brought before Provincial or District Consumer Arbitration Committees. Disputes of TRY 186,000 or more cannot be decided by those committees and must proceed through mandatory mediation and Consumer Courts, or civil courts acting as Consumer Courts where no separate Consumer Court exists.
Applications may be filed personally or through an attorney, by hand, by post, or electronically through e-Government via TÜBİS. Oral applications are not accepted. The application must include the dispute, request, value in Turkish lira, and supporting documents.
Installment sales disputes suitable for Consumer Arbitration Committees may include refund after withdrawal, unlawful acceleration, unfair installment charges, defective goods purchased in installments, service non-performance, refusal to return debt documents, and incorrect early payment calculation.
Consumer Courts and Mandatory Mediation
If the dispute value is TRY 186,000 or more in 2026, the Consumer Arbitration Committee route is not available. The dispute must proceed through mandatory mediation and then Consumer Court litigation if mediation fails.
High-value installment sales disputes may involve furniture sets, electronics packages, private education, medical or aesthetic service packages, vehicle-related goods, household systems, or luxury products. These cases may also involve promissory notes, enforcement proceedings, expert reports, and unfair contract term analysis.
A Consumer Court petition should clearly identify the legal basis: withdrawal, defective goods, defective service, unfair acceleration, early payment, hidden fees, failure to return debt instruments, or compensation.
Practical Advice for Consumers
Consumers should not sign installment contracts without reading the payment schedule. They should check the cash price, installment price, total cost, number of installments, withdrawal right, early payment rule, default clause, and any debt instrument.
Consumers should request a copy of every document signed. They should avoid blank promissory notes. If withdrawal is desired, they should act within seven days and use written or durable communication. If the seller demands all installments, the consumer should check whether the legal acceleration conditions are met.
If the product or service is defective, the consumer should not limit the claim to withdrawal. Defective goods and defective service rights may provide stronger remedies.
Practical Advice for Sellers and Providers
Sellers should prepare installment sales contracts in clear, readable, written form and give a copy to the consumer. They should not rely on oral payment plans or unclear documents. They should explain withdrawal rights, early payment, default consequences, and total cost.
Sellers should process valid withdrawal requests within seven days, refund payments, and return debt instruments. They should not accelerate remaining installments unless all legal conditions are met and a valid 30-day written warning is given. They should also avoid hidden fees and unfair clauses.
A compliant installment sales system reduces disputes and protects the seller in case of formal complaints.
Conclusion
Installment sales contracts in Turkey are regulated consumer contracts that require transparency, written form, and respect for mandatory consumer rights. The seller or provider delivers goods or performs services, while the consumer pays the price in parts. These contracts must be in writing, prepared clearly and readably, and a copy must be given to the consumer. If the seller fails to create a valid written contract, it cannot later use that failure against the consumer.
Consumers have a seven-day right of withdrawal from installment sales contracts without giving any reason and without paying a penalty. If withdrawal is validly used, the seller or provider must refund amounts received and return all documents placing the consumer under debt within seven days, without imposing cost on the consumer. The consumer must return delivered goods within seven days after withdrawal, unless the parties agree otherwise.
Default and acceleration rules are also strictly regulated. A seller may demand all remaining installments only if the seller has performed all obligations, the consumer’s default meets the statutory threshold, the acceleration right was reserved, and the consumer receives at least 30 days’ written warning. Interest, commission, and similar costs cannot be included in calculating accelerated installments.
For 2026, installment sales disputes below TRY 186,000 generally fall within Consumer Arbitration Committee jurisdiction, while disputes of TRY 186,000 or more require mandatory mediation and Consumer Court proceedings.
For consumers, the strongest strategy is documentation: keep the contract, payment plan, receipts, delivery records, withdrawal notice, debt instruments, default warnings, and all correspondence. For sellers, the safest strategy is legal compliance: clear written contracts, transparent pricing, lawful withdrawal processing, fair early payment calculations, and strict compliance with acceleration rules.
In Turkey, installment sales are not merely flexible payment arrangements. They are regulated consumer contracts. A properly structured installment sale protects both sides; an unclear, one-sided, or undocumented installment system creates serious legal risk.
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