Berlusconi, 78, will not however have to serve the sentence as the case's statute of limitations expires later this year, well before any final ruling will have been reached on appeal.
"It was a good trial, passionate, but in terms of consequences the imminent expiration date takes all the pathos out of the verdict," said prosecutor Henry John Woodcock.
The case centred around bribes totalling three million euros (USD 3.3 million) that were paid, through an intermediary, to Senator Sergio De Gregorio in order to get him to leave the coalition of then premier Romano Prodi.
The senator has admitted accepting the money.
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The case marks the latest in a string of legal woes for Berlusconi.
Earlier this year, he completed a community service order for corporate tax fraud but was cleared of having sex with an under-age dancer after judges ruled he could not have known she was a minor.
In summing up the bribery case, prosecutor Vincenzo Piscitelli had told the court the three million euros paid to the senator were "a colossal economic investment made with the aim of achieving the sole goal that interested Berlusconi, who was obsessed by his desire to kick Prodi out and take his post".
The case will reach its statute of limitations in October or November at the latest, according to Italian media.