Arrive, permesso, renew

The KIT (kit postale) is the application that converts your national visa D into the permesso di soggiorno. Community: file it within ~8 days of entering Italy - the deadline is treated as hard. Get the envelope at a Poste Italiane Sportello Amico window (one per person, limited stock - you may need to try several offices). Fill it in black ink, block letters, one letter per cell; do not seal the envelope. Community fees: marca da bollo ~16 EUR per KIT, postal fee ~30 EUR, and a permit fee of ~40 or ~80 EUR depending on the requested term. You receive a ricevuta plus a Questura appointment for fingerprinting - guard the ricevuta, it is your only proof of legal stay until the plastic card.

The Partita IVA (sole-proprietor registration) is usually opened in Italy with a commercialista (accountant); community service cost ~800-1200 EUR/year, often including invoicing and the annual return. The forfettario regime (community): income limit ~85,000 EUR/year; tax is applied not to all revenue but to a share set by a profitability coefficient for your ATECO code (~67% for many IT/service codes); the rate is community ~5% in the first years, then ~15%, no VAT. INPS social contributions are paid separately (the biggest line for many - community ~24-26% of the base, revised yearly). Do not pick the ATECO code yourself - the coefficient affects both the tax and your income proof for renewal.

For the lavoro autonomo renewal, community advice is to prove the Partita IVA activity was real and earned income for the previous year - even a small declared income beats a zero return. If a spouse and children reunify, you typically prove additional income per family member. Specific thresholds for your Questura and year are not universal - confirm them in advance.