I owe you one means 'thanks, I'll return the favour'. You thank someone for a favour and promise to do one back: You covered my shift at such short notice. I owe you one. The one is one favour in return. It's casual: people say it to friends and colleagues.
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Thanks for + noun / -ing. I owe you one.
- You covered my shift at such short notice. I owe you one.
- I owe you one for finding my keys before the train left.
- Thanks for staying to help with the chairs; I owe you one.
What changed
First versionThanks for checking the timetable; I'm owing you one.
RevisionThanks for checking the timetable; I owe you one.
The thanks is about right now, so the continuous form can seem natural: I'm owing you one. But owe is a state verb, like know or need, and it isn't normally used in the -ing form. Drop am and -ing, and the thanks sounds natural.
I owe you ten pounds is a real money debt. I owe you an apology means 'I should apologise to you'. I owe you one is a light 'I'll do you a favour back'. In a formal email, write I really appreciate your help instead.
Your turn
You helped me finish before the deadline. I ___ you one.
Show the answer
owe — Owe means 'have a debt', and that's what I owe you one needs. Own means 'have, possess': the words look alike, but the meaning is completely different.
A classmate lent you their notes before an exam. Thank them in one sentence with I owe you one.
Thanks for the notes before the exam — I owe you one.
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