Learn Italian: Se offriamo una garanzia, il rischio diminuisce. - If we offer a guarantee, the risk decreases.

In Italian, when talking about real or highly likely conditions (the first conditional), you can use the present tense for both the 'if' part and the result part. This is very common for stating general facts or immediate consequences. It works just like saying 'If we offer a guarantee, the risk decreases' in English.

I see diminuisce comes from the verb diminuire. Why does it have 'isc' in the middle?

Diminuire (to decrease) is one of the many regular -ire verbs that insert -isc- before the ending in the present tense (except for the 'we' and 'you all' forms). Since il rischio is an 'it' (third person singular), it takes the -isc- form, making it diminuisce instead of just 'diminue'.

Could I include the word noi before offriamo?

Yes, you could say Se noi offriamo, but it is completely optional and usually left out. Italian verbs already show who is doing the action through their endings (the -iamo in offriamo always means 'we'). You would only add noi here if you wanted to emphasize that we are the ones offering it, rather than someone else.

Is it possible to use the future tense for the result in this sentence?