I'll pay only my share.
PAH-go SO-lo lah MYA PAR-teh. 'parte' = PAR-teh, two syllables, stress on first.
Use when you want to pay only for what you personally consumed, not share equally with the group. More specific than 'paghiamo separatamente'.
'Solo la mia parte' = only my share. This expression implies you want to pay exactly what you ate/drank, not an equal split. You may need to specify what you ordered to the waiter.
Quanto devo?
How much do I owe?
Simple direct question about your individual amount.
Vorrei pagare solo quello che ho ordinato.
I'd like to pay only what I ordered.
More specific explanation.
Cosa ho preso in tutto?
What did I have altogether?
Asking for your individual total to be itemized.
Splitting bills individually in Italy can slow down the checkout process. Italian waiters are generally accommodating but may appreciate if one person at the table coordinates the split to save time during busy service hours.