From the income statement to the Redditi SC return: adjustments, alignment with GAAP, error fixes and carried-forward losses

Paolo runs an SRL in Padua that builds made-to-measure furniture. The 2025 accounts approved by the members show a profit of €62,000, and he sees the tax return as paperwork to get through in the autumn. The draft from his accountant tells another story: €71,500 of business income in one section, then €57,200 of old losses wiped against it. None of the three figures matches the one he had in mind.

A return built from sections

Redditi SC is the yearly income tax return of Italian capital companies and commercial entities. The Agenzia delle Entrate reserves it for IRES taxpayers: joint-stock companies and partnerships limited by shares, SRLs, cooperatives, mutual insurers, resident commercial entities, and non-resident companies and entities with Italian income.

For someone running a small SRL, the return is not a form you fill in from the first page to the last. It is a set of sections, called quadri, each labelled with two letters and split into numbered lines. Accountants work through them in a logical order that rarely follows the printed sequence.

Three sections do most of the explaining. Section RF holds business income, which is where the accounting result turns into a taxable one. Section RN takes that income and derives the tax from it. Section RU lists the tax credits the company holds or uses during the year.

The official answers the Agenzia published on the 2026 return use exactly this vocabulary. In a FAQ dated 25 June 2026, the company's own business income appears on line RF57, and the prior-year losses being used sit in column 1 of line RN4. Knowing these references makes a draft return far easier to read.

Another FAQ, dated 30 June 2026, concerns section RU. It explains that a tax credit for investments is reported in the return for the year in which the managing body notifies the usable amount, not the year the investment was made. It shows how each item of tax data follows its own calendar.

Where it starts: the closed income statement

Article 83 of the TUIR, in its 2026 wording, sets the rule plainly. Total income is obtained by taking the profit or loss shown in the income statement for the financial year closed within the tax period, then applying the upward or downward adjustments that follow from the tax criteria.

That sentence imposes a fixed order of work. The books are closed first, then the accounts are drawn up, then the members approve them, and only after that does work on the return begin. A provisional profit produces a provisional income figure, and any change to the accounts after filing means redoing the return.

The Agenzia's page on the IRES tax base says the same thing in simpler terms. You start from the profit or loss in the accounts and, while completing the return, apply the adjustments that tax law requires for the income and expense items of the business. The accounting records themselves are left untouched.

In practice, section RF works like a bridge. On one bank stands the approved result, identical to the filed accounts. On the other stands business income for tax purposes. The adjustments span the gap and explain, one at a time, why the two numbers differ.

Upward and downward adjustments

An upward adjustment brings back into the tax base something the accounts deducted from profit but tax law refuses, either for good or for now. A downward adjustment does the opposite. It removes from profit an item the accounts recorded but tax law excludes or pushes into a different year.

Which specific adjustments apply depends on the rules for each cost and each revenue item, and this course does not list them. What matters here is how to read them. Every adjustment should trace back to one line of the income statement and to one tax rule that justifies the gap.

It helps to separate adjustments that are settled within the year from those that reverse later. A cost that is never allowed produces a permanent increase. A cost allowed only in a later year produces an increase now and a decrease afterwards. The second kind requires memory, because the future decrease has to be claimed at the right moment.

That is why the accountant keeps, alongside the return, a schedule of the differences still to reverse. Ask for it and file it. If you change accountants without it, the new adviser sees the final balance but not the history behind it, and deductions you are entitled to can quietly be lost.

• Profit or loss in the approved income statement: the starting figure, identical to the accounts
• Plus upward adjustments: items brought back into the base, permanently or temporarily
• Minus downward adjustments: items excluded, or recovered from earlier years
• Result: the company's own business income, placed on line RF57 in the Agenzia's FAQ

Alignment: when tax follows the accounting standards

Article 83 carries a second, less obvious rule about how accounts and tax relate. For certain companies, the accounting standards' criteria for qualifying, timing and classifying items apply for tax purposes too, even where they depart from the other rules in that part of the code. Tax, in short, accepts the accounting reading of many transactions.

Two groups are covered. The first prepares accounts under international accounting standards. The second, which includes many SRLs, prepares accounts under the Civil Code, with one explicit exception: micro-enterprises under article 2435-ter that have not opted to prepare ordinary or abridged accounts.

For a small SRL, the question to put to the accountant is therefore short. Does the company file micro-enterprise accounts without having opted out, or abridged or full accounts? In the first case alignment does not apply and the tax timing rules stand on their own; in the second, the accounting criteria feed straight into taxable income.

Paragraph 1-bis completes the picture. Companies applying the Civil Code, other than micro-enterprises that have not opted out, are also subject, where compatible, to the implementing provisions issued for companies using international standards. Choosing a format for the accounts, perhaps for simplicity, therefore carries tax consequences.

The course does not give the size thresholds that define a micro-enterprise. They are set by the Civil Code rather than the TUIR, and no served source for them was read when the course was written. Check them against the year's accounts, with whoever prepares them, before section RF is drafted.

Fixing an accounting error

Sometimes a cost or a revenue item is booked in the wrong year and the mistake only surfaces the following year. Paragraph 1-ter of article 83 deals with this for companies whose accounts are subject to a mandatory statutory audit. For them, correcting a non-material error counts for tax in the year the correction is made.

The relief comes with two time limits, and both must be met. The correction has to be made by the date on which the accounts for the year after the error are approved. It must also come before any access, inspection, audit or other assessment activity that the company has been formally notified of.

Two clarifications keep the rule from being read too widely. It does not cover errors the accounts themselves describe as material, and it does not apply to SRLs that have no statutory audit obligation. For those companies, correcting an error follows the general rules and needs to be discussed case by case with the adviser.

Losses from earlier years

Once the year's business income is known, the company may reduce it with tax losses from past years. Article 84 of the TUIR lets a loss be set against the income of later periods, but with a ceiling: no more than 80 per cent of each later year's taxable income.

Losses from the first three tax periods after incorporation follow a more generous rule. They can be used against the whole of the later years' taxable income, provided they relate to a new productive activity. A start-up SRL that closes its early years in loss is therefore spared the ceiling afterwards.

In the return, carried-forward losses are not deducted in section RF. As the Agenzia's FAQ shows, they appear in section RN, on line RN4. The structure is worth remembering: RF keeps the business income of the year itself, and the offset against the past only shows up at the next step.

Loss relief can also be blocked or limited when the members or the business activity change, and that needs a separate analysis. For now it is enough to know those limits exist, and that the year-by-year schedule of losses still available belongs with the papers an SRL keeps as carefully as its accounts.

From income to tax: where this course stops

From here the return applies the IRES rate to taxable income and subtracts credits, withholdings and payments on account already made. The rate itself, including the reduced rate and its conditions, is covered by another course in the catalogue. The aim here is only to make sure the base that rate is applied to is built correctly.

To check the order of magnitude of the tax on the taxable income you arrived at, the ActioFin IRES calculator starts from exactly that figure. It does not rebuild the adjustments or apply losses. You enter taxable income already adjusted and offset, and it applies the rate rules to it.

The rules quoted come from the TUIR as it applies to 2026. Legislative Decree 117/2026 repeals it from 1 January 2027 and reorganises income taxes into a new consolidated text. For returns filed in 2026 and for the 2026 tax period, the earlier wording described here is the one that counts.