The flat rate lands on a share of your turnover, not on your profit
A partita IVA in the regime forfettario never computes profit. It takes the fees you actually collected during the year, multiplies them by the coefficient fixed for your ATECO activity group, and calls the result your income. Your rent, your hardware, your subcontractors and your accountant do not appear in that calculation. Nobody asks what you spent.
So the coefficient is the tax. Construction and real estate keep 86% of turnover in the base. Professional, scientific, health, education and financial services keep 78%. Trade intermediaries 62%, street trading in non-food goods 54%, food manufacturing and shop trade and hospitality 40%. Everything not named in the table falls into the residual group at 67%, and that is where software and IT sit: ATECO divisions 62 and 63 are in the residual group, not in the professional one.
Read that twice if you write code for a living. The two lines look interchangeable and differ by a sixth of your annual tax.
Whatever survives the coefficient is taxed once, at 15%, by an imposta sostitutiva that replaces IRPEF, the regional surcharge, the municipal surcharge and IRAP. Your invoices carry no VAT either.
Your tax base and your contribution base are two different numbers
One turnover, run through one coefficient, produces two figures that are never equal. Getting them the wrong way round changes what you owe INPS.
Contributions are deductible from forfettario income, but they cannot shrink the base they are themselves charged on. INPS reads the gross figure, revenue times coefficient, before any deduction. The tax then applies to that same gross figure minus the contributions you paid during the year. The return keeps the two apart in separate rows, which is the clearest proof that they are not the same number.
Take a developer collecting €60,000 in a year. The coefficient turns that into €40,200 of gross forfait income. INPS charges its rate on the whole €40,200, about €10,480. The tax base is what is left after that deduction, €29,720, and the substitute tax on it is €4,458. Total to the state around €14,938, before a single real expense has been paid out of the remaining €45,062.
Reverse the order, deduct contributions first and then charge INPS, and you would get a smaller contribution and a bill that no Italian form produces. The calculator above does it in the legal order.
Crossing EUR 85,000 costs you next year. Crossing EUR 100,000 costs you this one
Entry into the regime looks backwards: last year’s revenue at most EUR 85,000, and staff costs at most EUR 20,000 gross. The exit rules look forwards, and there are two of them.
Go past the entry limit during the year and nothing happens immediately. You finish the year inside the regime and drop out on 1 January, with time to prepare. Go past €100,000 and the regime ends on the spot and backwards: the entire year is recomputed under ordinary rules, IRPEF scale and surcharges included, and VAT falls due from the invoice that broke the limit onwards, on work you already priced and billed without it.
The distance between those two outcomes is the most expensive thing on this page. If you are close to the ceiling in the last quarter, the invoice date matters more than the invoice.
If your client is your old employer, the regime is not available at all
Not more expensive. Not available. Invoicing mainly a current employer, an employer from either of the two previous tax periods, or anyone connected with them, bars the forfettario outright.
That is the standard relocation story: resign, register a partita IVA, keep billing the same company, and pay the friendly flat rate. Any calculator that shows a rate for that arrangement is lying, including this one, because the engine cannot see who your client is. The same section of the law also bars anyone holding a stake in a partnership or control of an S.r.l. with a related activity, and anyone whose employment income last year exceeded EUR 35,000.
Non-residents are out too, unless they are resident in the EU or EEA with at least three quarters of their worldwide income arising in Italy.
The rate is cheap because everything attached to IRPEF is gone
There is no IRPEF on this income, so there is nothing for IRPEF reliefs to work on. Medical expenses, building renovations, mortgage interest and dependants all reduce a tax you are no longer paying. A household with heavy detrazioni can be better off on the ordinary regime at a turnover where the flat rate still looks unbeatable on paper.
Two smaller consequences. Clients apply no withholding to your invoices, so nothing is set aside during the year and the full tax plus contributions arrive together at the filing deadlines: the first year of a partita IVA ends with a bill roughly the size of a quarter’s income, payable at once. And staff costs above EUR 20,000 gross end the regime the following year.
INPS is three different worlds, and the tax regime does not decide which one you are in
Pick the wrong scheme in the calculator above and the answer is wrong by thousands, whatever the tax side says.
Professionals with no fund of their own pay the Gestione separata: 26.07% of the gross forfait income, up to a ceiling of €122,295. There is no minimum contribution here. The minimum-income figure quoted for this scheme, the same one the artisans below are charged on, means something else entirely: it is the income that buys a full year of pension credit, not a floor on what you owe. Earn little, pay little, accrue a fraction of a year.
Registered artisans are in a scheme that does not work as a percentage at all. INPS charges a compulsory contribution on an assumed income of €18,808 at 24%, in four instalments, in a year when the business earned that much and in a year when it earned nothing. Above that assumed income the same 24% continues up to €56,224, then 25% to the same ceiling.
Traders pay the same structure at slightly higher rates, 24.48% and 25.48%, on the identical compulsory minimum. Those extra fractions of a point fund the indemnity paid to shopkeepers who close down before reaching pension age.
For a low-turnover artisan or trader, that fixed minimum, not the flat tax, is the largest line in the year.
The start-up rate is real, and the engine cannot check that you qualify
New activities pay 5% instead of the standard rate for the tax period in which the activity starts and the four following ones: 5 tax periods in total, not five calendar years from any date you choose.
Three conditions, all required. No artistic, professional or business activity in the three years before you start. The new activity is in no way a continuation of what you previously did as an employee or as a self-employed person, which knocks out most people who registered a partita IVA to keep doing their old job. And if you took over someone else’s activity, its revenue in the previous period was within the entry limit.
The contributions do not change. The reduced rate is a tax relief, and INPS charges the same amount as it would at the full rate.
The ordinary regime is where you land, and it is not the punishment it sounds like
Ordinary means tax on what you actually earned: fees collected less real business expenses, on a cash basis, taxed on the IRPEF scale at 23% up to €28,000, 33% to €50,000, and 43% above, plus the regional and municipal surcharges of wherever you live. Contributions run at the same 26.07%, but on the profit before those contributions are subtracted.
Real costs come off in full. So do the reliefs the flat rate throws away. A freelancer with heavy expenses, a mortgage and dependants can end up paying less on the progressive scale than on a flat rate several times smaller, and that comparison is the reason both regimes sit in the same calculator.
What changed in 2026
The regime itself did not move. The Budget Law for 2026 leaves the forfettario alone: same rates, same coefficients, same thresholds, and the coefficients remain keyed to the old ATECO 2007 groups by express provision, even though Italy switched to the ATECO 2025 classification last year. If your new-style code does not appear in the table, it has to be mapped back.
What reindexed is INPS. The assumed minimum income, the point where the artisan and trader rate steps up, and the annual ceiling all carry 2026 values, and the employment-income bar stays at its raised level for this year. Comparing against a spreadsheet from 2024 will be wrong on every contribution line.
What this calculator does not model
- Professional funds. Lawyers, architects, engineers, doctors, accountants and journalists pay their own cassa, not the Gestione separata: different rates, their own minimums, often a percentage added on top of every invoice. If you are enrolled in one, the contribution line here is simply not yours.
- The contribution discounts for artisans and traders. A forfettario in those schemes can claim a 35% cut, and anyone whose first INPS registration fell in 2025 can claim a 50% cut running 36 months instead. Both must be applied for, they are alternatives to each other, and we show the full contribution. Your bill may be materially lower than shown.
- The reduced Gestione separata rate for people already covered by another compulsory scheme or drawing a pension. Everyone here is charged the full rate, so a freelancer with a day job is overstated.
- The five-year test on the start-up rate. We show the conditions and do not check them. Select the reduced rate without qualifying and the page understates your tax by two thirds.
- Copyright royalties, which enter the forfettario base after their own abatement rather than through the activity coefficient. We treat every euro as an ordinary fee.
- Payment timing. Contributions are really paid in instalments based on the previous year, with two payments on account and a balance. The annual total can be right while no individual bill matches it.
- Expense caps in the ordinary regime. Italian law halves or limits many deductions, vehicles, phones and hospitality among them. We take the expense figure you enter at face value.
Thinking about a company instead? The Italian founder route runs the same work through corporate tax and dividends, and the ordinary scale behind the comparison above lives on the Italian income tax calculator. If the country is still an open question, the Portuguese simplified regime taxes a coefficient of turnover the same way but sends the result to a progressive scale, while the Spanish autónomo deducts real expenses and charges a monthly cuota whether or not anyone paid you.