Learn Turkish: Harcı ödeyeceğiniz zaman vezneye gideceksiniz. - When you pay the fee, you will go to the cashier.

In Turkish, to say "when" for a specific event that hasn't happened yet, we use the future participle -(y)ecek + a possessive suffix + zaman. Literally, this means "at the time of your future paying." English often uses the present tense for future "when" clauses, but Turkish strictly marks it as a future event.

What is the exact breakdown of the word ödeyeceğiniz?

It comes from the verb ödemek (to pay). We add the buffer -y-, then the future suffix -ecek. Because it is followed by the possessive suffix -iniz ("your", matching the formal/plural "you"), the k at the end of -ecek softens to a ğ. So it breaks down as öde-y-eceğ-iniz (your future paying).

Why is the word for fee written as harcı instead of harç?

Two things are happening here. First, harç (fee/charge) takes the accusative case suffix -ı because it is the specific direct object of the verb ödemek (you are paying the fee). Second, adding a vowel suffix causes the hard consonant ç at the end of harç to soften into a c.

Is there a difference in meaning between ödeyeceğiniz zaman and ödeyince?