Why a bank letter cannot travel alone
A reference letter from your bank is a private paper. A branch manager writes it on headed paper and signs it. No public office made it, and state desks compare signatures only against samples they hold. So the letter, on its own, gives them nothing to check.
That is why the chain has an extra first link, and why anyone asking how to legalize a Bank Reference Letter hears about a notary before they hear about a state office. A notary certifies that the manager signed in front of him. Only then does the letter carry a signature the state can trace.
What the letter should say
Ask the branch to name the holder exactly as the passport spells it, in full, with no short forms. The letter should say what the bank can confirm about the relationship, carry a handwritten signature, and bear the branch stamp. A printed signature block is the single most common reason a file stalls.
What the letter must confirm is set by the office reading it, not by the bank. Some want proof only that an account exists. Others want a figure or a range. Ask them in writing, show that reply to your branch, and let the branch choose wording it can stand behind.
Which Italian desk signs it
Once a notary has certified the manager's signature, your letter counts as a notarial paper. That sends it to the Procura della Repubblica, the prosecutor's office at the court, which keeps notaries' sample signatures. Papers from a town hall or a state office go to the Prefettura instead. So to legalize a Bank Reference Letter in Bari, you want the court address rather than the Prefettura's.
The consulate, the cost and the wait
The embassy legalization of a Bank Reference Letter in Bari is finished at the destination country's embassy or consulate in Italy. Whether that stamp is wanted at all depends on the country reading the letter, so put the question to the receiving authority first and keep their written reply with the file.
Money splits neatly. A €16 tax stamp, the marca da bollo from a tobacconist, covers the Italian side, while the consulate charges a fee it sets itself. Consular legalization of a Bank Reference Letter in Italy usually runs 10–15 business days, dropping to 3–5 business days on a faster slot.
Where these letters are read
Visa and residence files ask for one. So do tender bids, a lease deposit, a credit line for a foreign branch, and many property purchases. An embassy attestation of a Bank Reference Letter in Bari is often filed beside payslips or a tax return, so ask which papers travel together.
Most rejections come from four small things. One is a printed signature rather than an inked one. Another is a missing branch stamp. The third is the holder's name in short form. The fourth is a letter older than the reading office allows, so check the date too.