What's the reason for you to leave/for you leaving

[joham]

What's the reason for you to leave the company?
What's the reason for your/you leaving the company?

Are both sentences good English?

Could I ask native speakers to help me please? Thank you in advance.

[svartnik]

What's the reason for you to leave the company?
What's the reason for your/you leaving the company?

Are both sentences good English?

Could I ask native speakers to help me please? Thank you in advance.

According to Swan's Practical English Usage, both are possible in the second sentence.
Forget the first sentence. 'for' is a preposition and it cannot take infinitives as their complements.

[bhaisahab]

What's the reason for you to leave the company?
What's the reason for your/you leaving the company?

Are both sentences good English?

Could I ask native speakers to help me please? Thank you in advance.

The first sentence is not good English, the second is fine with either 'you' or 'your'.

[svartnik]

However,
It is difficult for me to do this is possible, because 'me' is not the subject of the verb in the infinitive clause, but the prepositional complement of 'for'. The infinitive 'to do this' is the extraposed true subject.

[svartnik]

The first sentence is not good English, the second is fine with either 'you' or 'your'.

Thanks for your confirmation.

[joham]

The first sentence is not good English, the second is fine with either 'you' or 'your'.

Thank you, bhaisahab and svartnik. Another question:

Are these sentences good English?

The reason of (our/us) closing it is that we are able to filter the emergencies first.
I'm sorry for the reason of (for?) the increase in business. (Does repeated 'for' sound odd?)
(These two sentences are taken from the Corpus of American English.)
Thank you again.

[svartnik]

Thank you, bhaisahab and svartnik. Another question:

Are these sentences good English?

The reason of (our/us) closing it is that we are able to filter the emergencies first.
I'm sorry for the reason of (for?) the increase in business. (Does repeated 'for' sound odd?)
(These two sentences are taken from the Corpus of American English.)
Thank you again.

- with of, I would use our but not us
- no, it is not odd to me

[Pedroski]

*What's the reason for you to leave the company?
What's the reason for your/you leaving the company?

They're both rubbish!

Why not write why? Why are you leaving the company?

Or otherwise say: For what reason are you leaving the company.?

With every extra word you are exponentially increasing the possibilities for mistakes and misinterpretation!

[bhaisahab]

*What's the reason for you to leave the company?
What's the reason for your/you leaving the company?

They're both rubbish!

Why not write why? Why are you leaving the company?

Or otherwise say: For what reason are you leaving the company.?

With every extra word you are exponentially increasing the possibilities for mistakes and misinterpretation!

'What's the reason for your leaving the company?' Is perfectly correct and, I would say, fairly likely to be used. Why do you think it is rubbish?