What to write in a birthday card.

Their name, the wish, one sentence that could only be about this person, and a sign-off. That is the whole card, and the third element is the only one that requires you.

Look at what usually gets written in the blank half: "Happy birthday! Hope you have a great day!" The card already said that on the front, in a nicer typeface. Repeating it is not a failure of effort so much as a failure of instruction. Nobody is ever told what the inside is actually for.

It is for the detail. Something they did this year, something they always do, something you noticed. "Congratulations on finally leaving that job" is a better birthday card than four lines of well-wishing, because it proves someone was paying attention. That is what a birthday card is actually delivering: evidence of attention.

If you cannot think of a personal line, three prompts usually shake one loose: what did they do this year, what do they always say, and what are they hoping for next. Any one of those produces a sentence in under a minute.

Four parts, and only one of them takes any thought. Working in order stops the two usual outcomes: a card that repeats the printed verse, and a card that rambles because it never found a point.

Greeting. Use the name and the form you actually use out loud. A card to your mother that opens "Dear Mrs. Reid" is a joke; a card to a colleague that opens with a nickname can be one too, in the wrong direction.

The wish. Say it once. It is a formality and formalities are best done quickly. Where people go wrong is spending three of their four sentences on variations of it: happy birthday, have a wonderful day, hope it is a great one. That is the same sentence three times.

The personal line. This is the card. One concrete thing: an achievement, an ongoing joke, a hard year survived, a habit you find funny or admirable. Specific beats warm. "You are such a kind person" is warm and forgettable; "thank you for driving four hours in February for something that took twenty minutes" is the same compliment with proof attached.

Close. A sign-off that matches the relationship and your name. From a couple or a family, list the names people would expect to see.

The same words do very different work depending on the distance between you. Find your row, then swap the brackets for what is true.

The last row is deliberately plain. When you do not know someone well, a short, unfussy card is the correct card, and the temptation to compensate with warmth you have not earned is the thing to resist.

Milestone cards fail in a predictable way: the number takes over and the card becomes a joke about age with a name written under it. Mark the number once, then write something better. What follows is what each decade tends to want.

The pattern down the table is worth noticing. The younger the milestone, the more the card looks forward. The older it is, the more valuable it becomes to say something plainly that has gone unsaid. That is not a rule about age, it is a rule about what people at each stage have enough of already.

A joke in a birthday card is a good instinct and a narrow target. The reliable rule: point it at yourself, at the situation, or at something they joke about first. Point it at their age, their body, their relationship status or their career and it lands as a small unkindness with a smile drawn on it.

One structural tip: put the joke first and the sincere line last. Cards that end on the joke read as if you were avoiding saying something real, which is often exactly what happened. Cards that end on one honest sentence get kept.

For when the card has to be written on the way there. Each of these is finished; adding a name and one detail makes it yours.

A card attached to a gift has a different job from a card sent alone. It should say why this object, not what the object is. The recipient can see what it is.

"So you stop losing the good one" tells them something. "A pen!" does not. One clause about the reason turns an item into a decision someone made about them, and that reason is the part people remember years later, usually more clearly than the gift itself.

If the gift is engraved, the card is also where the engraving gets explained if it needs explaining. A date, a set of initials, a short phrase with a history. Do not assume the meaning is obvious; write the one line that makes it land, then let the object do the rest.

And if you are giving something practical, resist apologizing for it in the card. "Sorry it is boring" is a strange thing to hand somebody along with a present you chose on purpose. Say what it is for and leave it there.

Strip all of that out and what remains is a name, a wish, one true observation and a signature. It takes a minute, and it is the version they put on the shelf rather than in the recycling on Sunday.