What should I do when I make a mistake with a customer?

The instinct is to establish the context first, particularly when the mistake had a reasonable cause. That instinct is wrong in sequence rather than in content. Leading with an explanation reads as defence to somebody who is currently affected, however accurate it is, and it invites a rebuttal of the explanation rather than a conversation about the fix. Lead with what happened and what you will do, and offer the reason afterward only if they want it.

Tell them before they discover it wherever possible. A mistake you disclose is a demonstration of integrity. The same mistake found by the customer is a demonstration that you either did not notice or did not say, and both are considerably worse than the original error. This holds even when there is a chance they would never have found out, because the occasions when they do are the ones that end relationships.

Be specific about what went wrong rather than expressing general regret. Naming the actual thing shows you understand it, and understanding is what reassures somebody that it will not recur. Apologies that describe an experience rather than an error, such as sorry you were inconvenienced, read as formulaic and shift the problem onto how they felt about it.

Say what you will do and when, then do it early. The remedy matters less than its certainty, and a modest fix delivered on the day promised repairs more than a generous one delivered late. This is also the point at which you should decide whether to offer something beyond the fix, and deciding under pressure produces inconsistency you will regret later.

Do not over apologise, which is the failure on the other side. Repeated apologies, excessive self criticism, and offering more than the situation warrants can make a customer uncomfortable and can suggest the error was larger than it was. One clear apology, a fix, and a return to normal professional register is what a competent business looks like.

Understand the commercial arithmetic before deciding what to offer. The cost of resolving a mistake generously is almost always smaller than the cost of a negative review, particularly for a first year business with few reviews where one critical entry carries disproportionate weight. That does not mean conceding to every demand, and it means the calculation is rarely about the immediate amount.

Fix the underlying cause rather than only the instance. Most mistakes in a small business originate in the same few places: something not written down, a step performed from memory, or an assumption both parties made differently. Addressing the gap prevents the next several, and that is where the real value of an error sits.

Then let it go. Businesses that continue referencing a resolved mistake, apologising again in subsequent conversations or discounting future work, keep the error present in the relationship long after the customer had moved on. Resolve it properly once, and then behave as though it is finished, because for them it usually is.

Tell them in whichever channel reaches them fastest rather than the one that feels most comfortable. The instinct is to write, because writing allows composition and avoids the immediate reaction. A phone call for anything significant lands better, resolves faster, and demonstrates a willingness to face the conversation that an email cannot.

Record what happened once it is resolved, briefly and without blame. Individual errors look isolated and a year of them usually reveals one or two specific gaps, almost always in communication rather than in the work itself. That record is the cheapest quality information available and almost nobody keeps it.