This is the genuine official Mod. 209 form for filing a permesso di soggiorno by post. Hover (or tap) a number on the form to see what goes in that field. The comments are ours, in Russian and English; the form itself is official. A guide from practice, not legal advice - verify against the live form and the istruzioni.
Your motive (permesso type)
File the KIT shortly after entering on a Visa D (the law says ~8 days; verify on portaleimmigrazione.it). Fill it in black pen, block capitals, one letter per box.

Al Signor Questore di
The city (comune) where you will give fingerprints, plus the 2-letter province code next to it (TO, MI, RM).
Marca da bollo 16,00
The post clerk sticks the 16 EUR duty stamp here. Buy it at a tabaccheria beforehand, but do NOT stick it yourself.
COGNOME
Surname in Latin BLOCK capitals, exactly as in the passport - one letter per box.
NOME
Given name in Latin, exactly as in the passport.
PROVINCIA / COMUNE DI DOMICILIO
Province (code) and comune where you live - duplicate from the header.
CHIEDE IL rilascio / rinnovo
Tick what you ask for: rilascio - first issue, rinnovo - renewal, aggiornamento - update of data.
CODICE TIPOLOGIA
Two-digit motive code (Tabella 2) - depends on your motive. Check it in the istruzioni.
NUMERO PERMESSO POSSEDUTO
Only for a renewal (rinnovo): your current permesso number. Leave blank for a first application.
DATA DI SCADENZA
Expiry date of the current permesso (renewal only), dd/mm/yyyy.
MODULI / NUMERO FOGLI
How many modules (01 or 02) and total A4 sheets - fill this LAST, once everything is assembled.
DATA / FIRMA
Date and signature BY HAND on the printed form. Keep the signature inside the box.

CODICE FISCALE
Italian tax code (16 chars), if you already have one. Leave blank if not.
STATO CIVILE
Marital status as a code: e.g. A - single, B - married (see the istruzioni).
SESSO
Sex: M - male, F - female.
CODICE STATO DI NASCITA
Three-letter country-of-birth code (Tabella 3), e.g. RUS.
CODICE CITTADINANZA
Three-letter citizenship code (Tabella 3).
CITTA’ DI NASCITA
City of birth in Latin, as in the passport.
PASSAPORTO / NUMERO
Tick "passaporto" and enter your passport number and its expiry date.
DATA DI INGRESSO
Entry date from the stamp or, without one (a D visa does not have to be stamped), from the boarding pass. It starts the 8 working days for filing the KIT (art. 5(2) TU).
FRONTIERA
Border crossing of entry: the airport or the name on the stamp, or without a stamp the arrival airport from the boarding pass.
NUMERO / TIPO VISTO
Visa number (small print on the visa) and its type (D for a long-stay visa).

PROVINCIA / COMUNE (recapito)
Province and comune of your address in Italy - notifications go here.
INDIRIZZO
Street of residence. With a Booking/Airbnb stay, use the address from the confirmation.
CIVICO / SCALA / INTERNO / CAP
House number, stairwell (scala), flat (interno) and postal code (CAP, 5 digits).
TELEFONO CELLULARE
Italian mobile - the fingerprint-appointment SMS comes here. Make sure the number works.

ATTIVITA’ LAVORATIVA
Type of work: for the self-employed and freelancers - lavoro autonomo.
MANSIONE
A short description of your activity (e.g. CONSULENZA IT).
DENOMINAZIONE / P. IVA
Activity name and Partita IVA / tax code, if already opened.
MATRICOLA INPS
INPS number, if you have one (social-security contributions).
These are the main pages. Pages 4-8 of Module 1 are for family members, filled the same way. Print the blank form and copy your data onto it by hand.
Learn more: kit postale and permesso in the knowledge base ->
The KIT (kit permesso, kit postale) is the paper Mod. 209 application in a Poste Italiane envelope with which you ask to convert your national visa D into a permesso di soggiorno - the plastic residence card. The same form is filed for renewals. The tool above walks the real form field by field for your motive; it is a community-experience guide, not legal advice - before filing, check the instructions inside the envelope and official sources. The full process from envelope to plastic is described in kit permesso: how to file the KIT.
The envelope is free at a Poste Italiane office - go to the Sportello Amico counter and ask for the kit permesso (also known as the kit giallo). The community notes envelopes can be scarce, handed out one per person and in person only; central offices in big cities are often "out", so a residential district or suburb office is the smarter bet. Each family member from roughly age 14 needs their own KIT; younger children are written into their parents' forms. The clock matters most: per the community you have about 8 days after entering on a visa D, the deadline is treated as strict, and filling the form takes hours - so pick the envelope up on day one. Verify the procedure on poste.it and questure.poliziadistato.it.
The envelope holds two modules. Modulo 1 is the main one, with personal data and the motive (a typology code from Tabella 2) - everyone fills it; family members joining and children often need only it. Modulo 2 covers work and income: lavoro autonomo fills the autonomo, Partita IVA and income sections, nomade digitale declares income the same way, while residenza elettiva usually skips Modulo 2 - means are proven with separate documents. Write strictly in black pen, block letters, one character per box; leave the envelope unsealed - the operator checks it. You will need a codice fiscale, an Italian phone number and an address with its CAP - the address determines your questura; the first registration steps are covered in codice fiscale and residenza.
The form travels with a marca da bollo of about 16 euro (the revenue stamp is sold at a tabaccheria - the sign with a T), copies of all passport pages including the entry stamp, and a copy of the visa D annotation; families add certificates with an apostille and sworn translation (how to legalize them - in the document legalization guide). To assemble the full set for your motive and questura, use the document-pack builder. At the counter the operator checks your passport, takes the fees (about 30 euro postal fee plus the permesso fee, per the community) and hands over the ricevuta - two receipts with the assicurata and istanza numbers and a sheet with the fingerprints date. Guard it: until the card is issued it is your only proof of legal stay, and whether you can travel on it is unpacked in travelling on the ricevuta.
Per the community: the filled modules (Modulo 1; families often need only that one), the payment slip, a marca da bollo of about 16 euro, copies of all passport pages including the entry stamp, a copy of the visa D annotation, and for families - marriage and birth certificates with an apostille and sworn translation. The exact list depends on the motive and questura - check the instructions in the envelope and questure.poliziadistato.it; not legal advice.
The envelope itself is free at the post office, but the community reports fees: a marca da bollo of about 16 euro per KIT (bought at a tabaccheria), a postal fee of about 30 euro when handing in the envelope, and the permesso fee - often cited as roughly 40 or 80-100 euro depending on the requested term. Figures change - verify current ones on poste.it and official sites; not legal advice.
Before handing it in it is simple: the envelope stays unsealed and the post operator checks your data against the passport before accepting, so chats advise pencilling everything first and only then tracing in black pen. A mistake noticed after filing is usually raised at the fingerprints appointment, per the community. The country-of-birth code field is especially treacherous: for those born in the USSR a wrong code can stall the card for months, and fixing it goes through the comune and the Agenzia delle Entrate. Check every field before sending.
Right at the counter: the Sportello Amico operator checks your passport against the form, takes the fees and hands over the ricevuta on the spot - two Poste receipts with the assicurata and istanza numbers, plus a sheet with the questura address and fingerprints date. Nothing arrives by mail later. Guard it: until the card is ready the ricevuta proves your legal stay, and per the community the original even allows trips to non-Schengen countries with return through an Italian border crossing.
Per the community you have about 8 days after entering on a visa D, and the deadline is treated as strict: miss it and the application may not be accepted, leaving the legality of your stay hanging. The community describes no official grace period, so the advice is to pick up the envelope on day one. How a delay is treated in your case cannot be predicted - verify the procedure on questure.poliziadistato.it and portaleimmigrazione.it; not legal advice.
My permesso has expired, and therefore the review of my husband's application has been postponed until my renewal. We submitted our fingerprints and are now waiting for the result.
The kit giallo states that the reasons for the residence permit include family circumstances. If the postal employee refuses, it may be a mistake. I had a case where one accepted the documents, and another did not.
Rephrased from open chats of Russian-speaking expats in Italy, with names and identifying details removed. This is lived experience, not legal advice: check rules and figures on the official sites.
Short answers from community experience are on the FAQ page.