The refusal usually arrives in one sentence. It worked when it left us. Everything after that — the estimate on the kitchen table, the increasingly formal emails, the sense of being managed rather than answered — flows from a single disagreement about time. The buyer believes the problem was always present and merely took a while to surface. The seller believes it developed afterwards, in the buyer’s hands, and is therefore the buyer’s misfortune. What settles it is not conviction but evidence, and specifically who is required to produce it.
Burden of proof sounds like a technicality for lawyers. In consumer disputes it is closer to the whole game. The party who has to prove something and cannot will lose, even when they are probably right, so knowing which side of the line you stand on tells you more than any argument about the merits.
The clock that changes who has to explain
Consumer sales law does something unusual with the ordinary rule that a claimant proves their claim. For an initial period after delivery, it flips the presumption.
The principle works like this. If a fault appears shortly after the goods were handed over, the law assumes it was already present at that point, in the sense that the item was not as it should have been when the buyer took it. The seller may rebut that assumption, but the effort is theirs: they must show that the goods were sound at delivery and that something else — misuse, an external event, normal consumption of a wearing part — caused the failure. If they cannot, the buyer wins by default. Across the EU this reversal now typically runs for the first year after delivery, and in some member states longer.
After that window closes, the burden lands back on the buyer. Now it is the buyer who must show that the defect existed, in origin, at the time of sale. Nothing about the buyer’s underlying rights has changed — the item is still either defective or not — but the practical difficulty has changed completely, and this is why the same complaint can be routine at month four and very hard at month eighteen.
There is a second clock running alongside the first. A buyer who discovers a problem must complain to the seller within a reasonable time of noticing it. Sitting on a fault for months while continuing to use the item damages a claim on its own, because the seller can argue the damage was worsened, or that they were denied the chance to inspect and repair. The safe practice is unglamorous: raise it in writing as soon as you notice, even before you know what is wrong.
Both clocks are easiest to watch in markets where the goods are expensive and every step leaves a record. Finnish practitioner writing on käytetyn auton viat ja ostajan oikeudet traces the presumption period and the duty to complain promptly through exactly that kind of transaction, and the structure it sets out is the one that governs any consumer purchase of comparable value.
What “already there at the time of sale” actually means
The phrase misleads people, because it sounds as though the item must have been visibly broken on the day of purchase. That is not the test.
The question is whether the cause was present, not whether the symptom was. A component already worn beyond its tolerance, a fatigue crack that had begun, a corroded connection, a repair done badly years earlier, a part fitted incorrectly — each of these can sit quietly for months and then produce a failure. The failure is the moment of discovery. The defect is older than that, and the law is concerned with the defect.
This cuts both ways. A buyer cannot succeed simply because something broke; things break. They have to point to a cause with a history. And a seller cannot succeed simply by showing that the item functioned at handover; a great many latent defects function perfectly until they do not.
The counterweight is expected lifespan. Goods are not required to be immortal. Consumables and wearing parts are expected to be consumed and to wear, and a failure that arrives roughly when a component of that type would normally reach the end of its life is not a defect at all — it is the item behaving as anyone should have predicted. Where the price was already discounted for age, the expectation adjusts accordingly — a large part of why used goods produce so much argument.
The expert’s report and what it is really for
Once the burden sits with the buyer, an independent technical opinion is usually the only realistic way to discharge it.
A useful report does not say the item is faulty. That much is already agreed. It says what failed, why it failed, and — the part that decides the dispute — what that mechanism implies about timing. An assessor who can state that the observed wear pattern is inconsistent with the distance, hours or use since purchase has produced a finding a seller struggles to answer. An assessor who writes that the component is broken has produced nothing that helps.
Three things make a report carry weight: independence from both parties, an examination of the actual item rather than a paper review, and reasoning that is stated rather than asserted. Reports written by the workshop that also wants the repair contract are discounted, because their interest is visible.
The sequencing matters as much as the content. Have the item examined before it is repaired, if at all possible, and photograph any parts that are removed. Repairing first and arguing afterwards destroys the evidence and hands the seller the strongest available response: that nobody can now verify what was there. The same discipline applies wherever a defective item can be quietly restored to working order before anyone impartial has looked at it.
The paper trail nobody thinks to keep
Most claims that fail do not fail on the law. They fail because the buyer cannot reconstruct what happened.
The material that decides these matters is mundane. The advertisement as it was worded when you saw it. Messages in which the seller described the item’s condition or history. The receipt, showing what was paid and by whom. Service or maintenance records covering the period after purchase, which demonstrate that you looked after the thing. Photographs at handover. Dated notes of when the symptom first appeared and what it did. A copy of your first written complaint and the seller’s reply.
Consolidated legislation is published openly at finlex.fi for anyone who wants the underlying rules rather than a summary, but reading the statute rarely changes an outcome. Having a dated message in which the seller said the item had never had a problem changes outcomes. Evidence beats interpretation almost every time.
It is also worth knowing that consumer disputes do not have to begin in court. Complaint bodies exist to handle exactly these arguments at low cost, they are used to weighing technical reports, and many household legal expenses policies attached to home insurance will fund an expert assessment. Checking that cover before commissioning anything is a five-minute task that occasionally pays for the entire process.
How to protect a claim while it is still winnable
Complain in writing the moment something is wrong, and date it. Do not authorise repairs until the item has been examined by someone independent, and keep the removed parts. If the fault appears within the first year, say so plainly and let the seller carry the work of proving otherwise; if it appears later, assume you will need a report that addresses timing, not just condition, and budget for it before you decide whether the fight is worth having.