Keeping your job and opening a VAT number: compatibility and the flat-rate scheme

Sara is an office worker in Turin with 28,000 € of employment income. In 2026 she registers for VAT to keep the books of a few craftsmen in the evenings, and under the flat-rate scheme her income comes to 8,000 €. She expects to owe only the substitute tax. In June 2027 she learns that the credit applied to her payslip was also too high, and pays the gap back.

Tax law does not forbid two jobs

No tax rule stops an employee from registering for VAT. Article 5 of the VAT decree defines practising a profession as habitual even when it is not exclusive: the lawmaker expressly allowed for someone to run an independent activity next to something else, a job included.

Anyone doing so earns two kinds of income in the same year. The salary remains employment income, taxed at source by the employer. The VAT-registered activity produces self-employment or business income, declared and paid by the person directly. This course follows the point where the two meet.

Tax is not the only constraint, though. An employment contract may contain exclusivity or non-compete clauses, and public-sector employees are bound by their own rules on outside work. None of the tax pages read for this course deals with those: check them separately before you register.

A second self-employed activity can also be occasional, with no VAT number, when it lacks habitual character. Someone doing one isolated job a year need not register anything. This course is for people who have chosen, or are obliged, to run the activity on a steady basis next to their job.

Registering for VAT while employed

Registration works the same for everyone. Professionals, and anyone starting an activity that needs no entry in the Companies Register, file form AA9/12 within 30 days of the start date. Someone launching a commercial or craft business uses the single business notice, Comunicazione Unica, instead.

Being an employee changes neither the form nor the deadline. It does change one question the form asks: which tax scheme you choose. Under the flat-rate scheme, a new starter declares that they presume they meet the conditions. For an employee that presumption needs checking, because two of the conditions concern the job itself.

Last year's salary

The Agency's page on the flat-rate scheme lists among the exclusions employment and similar income in the previous year above a set amount. The ordinary limit is 30,000 euros; for 2025 and 2026 the page raises it to 35,000 euros.

The comparison uses employment income, not the gross contractual salary and not the net amount on the payslip. The right figure is the one the employer reports on the Certificazione Unica as the year's employment income. Start from that document, not from an estimate.

Similar income counts too, such as income from a coordinated and continuous collaboration. Someone combining a part-time salary with a collaboration must compare the total of both with the limit. Two modest incomes can exceed it together even when neither does on its own.

There is an exception aimed at people who leave their job to go it alone. If the employment ended during the previous year, that year's salary does not count, on one condition: no pension and no income from a new job may have been received in that same year.

The table covers this ground only. Clearing it is not enough to enter the scheme: the revenue and staff-cost conditions must also be met, and none of the other exclusions may apply. The eligibility calculator checks them together, starting from the previous year's figures.

When the client is really your employer

The second exclusion affecting employees is trickier, because it has nothing to do with an amount. The flat-rate scheme is barred to anyone whose activity is carried on mainly for their current employer, for an employer of the two previous tax years, or for parties connected with them.

The rule targets one specific practice: turning an employee into a VAT-registered supplier who does the same work under lighter taxation. To stop it, the rule ignores the legal form of the relationship and looks at who pays most of the fees.

• The current employer, even if the self-employed work differs from the job
• An employer from the two previous tax years, even if that job has ended
• Companies or parties connected, directly or indirectly, with those employers
• Predominance is measured on the activity's fees, not on the number of clients

An employee who registers for VAT and bills 70 % of fees to a company controlled by their employer falls within this exclusion, even though the contract names a different client. By contrast, a few odd jobs for the employer within a broad client base are not enough to trigger it.

The page makes one exception: someone who starts out after completing the traineeship required to join a professional body. A newly qualified professional who sets up alone and keeps working with the firm that trained them does not lose the flat-rate scheme on that account.

The 5 % rate and your previous work

A new activity can benefit from 5 % over its first five years, but only if certain conditions hold. One of them weighs heavily on people coming from a job: the activity must in no way be the mere continuation of work previously done as an employee or as a self-employed person.

Picture a bookkeeper employed by a firm who, once registered, keeps the same kind of books for very similar clients: the continuation argument is an obvious risk. An administrative clerk who starts out as a photographer, on the other hand, is doing something new. The compulsory professional traineeship is again the exception.

Two further conditions complete the picture: no artistic, professional or business activity in the three previous years and, when taking over someone else's activity, that party's revenue must not have exceeded the entry limit. Anyone who has had a VAT number recently starts at 15 %.

Flat-rate income weighs on your tax credits

Flat-rate income stays out of the IRPEF brackets: it bears the substitute tax, which replaces income taxes and the regional and municipal surcharges. Many conclude that it leaves the salary untouched. The Agency's page says otherwise on one precise point.

Income taxed under the flat-rate scheme always counts whenever a rule ties entitlement to, or the size of, deductions, credits or benefits, even non-tax ones, to income requirements. The employment income tax credit is exactly such a case: its amount depends on total income.

The employer works out the credit month by month on the salary alone, since it knows nothing else. When the return adds flat-rate income to total income, the credit actually due shrinks, and whatever was over-applied on the payslip has to be repaid with the balance.

Between 15,000 and 50,000 euros of total income, every extra 1,000 euros removes roughly 86 to 92 euros of credit, and the 65-euro supplement disappears above 35,000. For an employee, the true cost of flat-rate income is therefore the substitute tax plus the lost credit.

The article 13 credit is not the only one tied to total income. For 2026, Law 207/2024 grants employees an additional credit of 1,000 euros above 20,000 and up to 32,000 euros, which falls to zero between 32,000 and 40,000. Flat-rate income counts here as well; the example above looks at article 13 alone.

Before you register: five checks

• Reread your employment contract for exclusivity, non-compete or prior-approval clauses
• Take last year's employment income from the Certificazione Unica and compare it with the applicable limit
• List your expected clients and make sure your employer, former employers of the last two years and related companies are not the main share
• Ask yourself honestly whether the new activity continues the work you did as an employee before counting on the reduced rate
• Estimate the employment credit and the additional credit you will lose, and put them in the budget next to the substitute tax

The order is deliberate. The first two checks tell you whether you can start and under which scheme; the third and fourth guard against challenges that would surface years later; the last one prevents the shock of the first return. Half an hour here beats any later correction.

The picture changes every year, because the conditions always look back to the previous year. A pay rise, a promotion or a new contract can push you over the limit and end the flat-rate scheme from the following year. Redo the check each January with the Certificazione Unica in hand.

A different tax return

With a VAT number you no longer file on form 730 alone. The Agency's page on the Redditi Persone fisiche return says it must be used by taxpayers with business or self-employment income. The salary is reported there with the other income, and the balance is paid with form F24.

Do not underestimate this change of habit. With form 730 and a withholding agent, any tax due was taken from the payslip. With Redditi PF, payment is up to the taxpayer, with deadlines of its own. The second module covers them in detail, together with advance payments.