French phrase
Quels impôts dois-je déclarer sur ~ ?
Meaning
What taxes must I declare on ___?
When to use it
Asks which taxes apply to a particular source of income. The tone is somewhat formal and seeks clarification.
Example dialogue
Quels impôts dois-je déclarer sur les loyers que je perçois ?
What taxes must I declare on the rental income I receive?
Il faut déclarer les revenus fonciers.
Rental income has to be declared.