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es cosa mía

it's my business

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phrase Rare #43,489
it's my business Depending on context, it can also mean that something is my responsibility or my job to handle.
SP: No te preocupes por la cena; es cosa mía.
EN: Don’t worry about dinner; I’ll take care of it.

Ya sé que no es cosa mía pero come bien.

I know it's none of my business, but he eats well.

— Audición (2000)

Esta no es cosa mía ni del director.

This is neither my fault nor the director’s.

— El cuaderno de Tomy (2020)

Es cosa mía.

It's my thing.

— Anaconda (2025)

Eso es cosa mía.

That's my thing.

El champagne es cosa mía.

Champagne is my thing.

— La dolce vita (1960)

Esto es cosa mía.

This is my thing.