1.The rule: own it fast, then move on
The instinct is to lead with the reason. Resist it. A long explanation makes the other person manage your guilt on top of their own disappointment, and it quietly asks them to say "no no, it’s fine". Name it in one line, skip the defence, then spend the rest of the message on them. These openers all do the job in under fifteen words:
- Happy belated birthday. No excuse. I just missed it and I’m annoyed at myself.
- I’m late and I know it. Happy birthday, properly, a few days on.
- Belated happy birthday. I’d love to tell you something dramatic happened. Nothing did. I forgot.
- This is late, so it comes with more words than it would have on the day.
- Happy birthday for Tuesday. Consider this the extended version, since I owe you one.



