Hidden Defects in Sale and Purchase: Business Liability Under Indonesian Law

Have you ever bought something that looked perfect at the point of sale, only for a fault to appear after it was used? This isn't just ordinary disappointment — it can become a serious legal matter. Many consumers don't realise that losses appearing after a purchase are often caused by hidden defects: conditions of the goods that the seller did not honestly disclose from the outset. As digital transactions grow, the information gap between businesses and consumers makes this risk more significant. So how far must a business be held responsible once a hidden defect surfaces after the transaction is complete?

Not every consumer loss is visible from the start. In many cases, problems only emerge after a transaction has closed — which is exactly where the concept of a hidden defect becomes central to determining a business's liability. In sale and purchase, the parties are rarely on equal footing: consumers are often in a weaker position due to limited information about the quality and condition of what they're buying. That imbalance opens the door to violations of consumer rights, particularly where a business isn't fully transparent about a product's actual condition, or where information is deliberately withheld or misrepresented to attract buyers.

This practice can be classified as a product defect — a condition where a product fails to meet consumer expectations or doesn't function as intended, causing material or non-material loss. Product defects fall into two categories: visible defects, detectable directly through the senses, and hidden defects, which cannot be known directly and typically arise from a producer or business's negligence, error, or deliberate concealment.

Such practices can harm consumers and breach the obligation to provide accurate information in trade, as governed by Law No. 8 of 1999 on Consumer Protection (UUPK). They also violate a consumer's right to true, clear, and honest information about the condition and guarantees of goods and/or services. Hidden defects are specifically addressed in Article 8(2) and Article 9 of the UUPK, which require sellers to fully disclose the objective condition of goods and prohibit businesses from offering, promoting, or advertising goods and/or services untruthfully — as though they contained no hidden defect. Concealing a defect doesn't just cause the buyer material loss; it breaches the seller's legal duty to guarantee the integrity of what is being traded.

Under the Indonesian Civil Code, hidden defects are addressed in Articles 1504 to 1512, which generally hold that a seller is responsible for a hidden defect whether or not they were aware of it — unless the agreement states otherwise. Liability under the Civil Code includes refunding the purchase price along with costs, losses, and interest where the seller knew of the defect; where the seller did not know, they need only refund the price and reimburse the costs arising from the transaction.

In the consumer protection context, hidden defects can lead not only to civil loss but to serious legal sanctions. The UUPK provides that a business breaching the transparency obligations in Articles 8 and 9 can face criminal sanctions under Article 62 — imprisonment of up to five years or a fine of up to Rp2 billion. On liability, Article 19 of the UUPK requires a business to compensate a consumer's loss, whether through a refund, product replacement, or other compensation under applicable law. This is often described as strict liability, though in practice it isn't fully absolute — a business can still be discharged if it can prove the loss resulted from the consumer's own fault.

Notably, unlike the general rule under Articles 1365 and 1865 of the Civil Code — which require the injured party to prove fault and a causal link — the UUPK applies a reversed burden of proof. Article 28 of the UUPK states that it is the business, not the consumer, that must prove whether or not it was at fault in a compensation dispute. In other words, the consumer no longer bears the technical burden of proving a product was defective; instead, the business must show that what it sold met the applicable standard and had no issue. If it fails to do so, it is deemed legally liable and must compensate the consumer's loss.

Ultimately, hidden defect cases are a reminder that honesty in every transaction is not merely an ethical expectation but a legal obligation. Consumers should no longer be positioned as the party who always bears the loss. With protections such as the UUPK in place, consumer protection is strengthened, and businesses are expected to be more transparent and accountable.