I'll pay.
PAH-go EE-oh — two short words. 'Io' = two syllables: 'ee-oh'. Stress on 'io' for emphasis.
Use when you want to treat the whole group or insist on paying. The 'io' (I) at the end adds emphasis — 'I will pay' (as opposed to someone else).
'Pago' is the first person singular of 'pagare' (to pay). 'Io' as subject pronoun is technically redundant in Italian (the verb ending already implies 'I') — adding it creates emphasis: 'I will pay' (not you).
Offro io.
It's my treat.
'Offro' from 'offrire' (to offer) — very natural Italian for treating someone.
Questa volta pago io.
This time I'll pay.
Implies a reciprocal arrangement — 'you'll pay next time'.
Ci penso io.
I'll take care of it.
Very Italian phrase — 'ci penso' (I'll think about it/handle it).
Italian social dining often involves a 'battaglia del conto' (bill battle) — a friendly argument over who gets to pay. This reflects Italian generosity culture, where treating others is an expression of affection and status. Refusing to let someone pay can require several insistent rounds.