"Я купил кресло, но ещё не знаю, куда буду его ставить."

Translation: I bought an armchair, but I don't know where I am going to put it yet.

[KalenGi]

This is also correct: "I bought an armchair but I do not know where to put it yet"

[GranvilleS6]

I bought an armchair but still don't know where to put it.

[KalenGi]

Sounds even more natural that the suggested translation.

[Mutusen]

I don't understand why the imperfective is used in this sentence. Why not "куда его поставлю"?

[deactivated user]

«Куда его поставлю» is correct too. Sorry, I don't know why imperfective is used either, but it does sound natural!

[Peter594672]

My guess is that it's like [in annoyingly soothing female robot voice] ...installation in progress, please stand by... 25%... 50%... installation in progress, please stand by... 75%... installation complete; enjoy your armchair.

Sounds ridiculous with an armchair, but if it was something bulky and heavy enough to require several people to carry it and fragile enough for a mistake to be possibly fatal, then the putting becomes a separate important process, which is reflected in the language.

Just a wild guess.

Anyway, I looked in here to see if there is a discussed reason for I've bought an armchair but I don't know yet where to put it not being accepted. I see that there isn't.

[Zuzanetka]

I bought an armchair should be accepted
but I don't know yet should be accepted
where to put it. should be accepted

[Colin107047]

Perhaps, with куда the meaning is " where I am going to be putting it" . Perfective means" where (?где) I will have finally put it"