How to Calculate Your ISEE: A Simplified Guide to Finding Your Way

The ISEE — Equivalent Economic Situation Indicator — is the tool the Italian State uses to measure a household's economic capacity. It is required to access a wide range of public benefits: from nursery school fees to subsidies for household utilities, from university scholarships to grants for purchasing a first home. Understanding how it works and how to obtain it is the first step towards knowing which benefits you are entitled to.

What the ISEE Measures

The ISEE does not capture income alone. It takes into account three combined elements: the income earned by the members of the household, financial assets (current accounts, securities, deposits) and real estate assets (properties and land). These values are added together according to precise rules and then divided by a coefficient that depends on the composition of the household — the so-called equivalence parameter, which increases with the number of people and accounts for particular situations such as the presence of family members with disabilities or dependent children.

How It Is Calculated: The Basic Formula

In general terms, the calculation follows this scheme:

• The total income of all household members is added up, drawn mainly from their tax returns.
• A share of financial assets is added (net of an allowance, that is, an exempt threshold), valued on the basis of the average balances of current accounts and other financial instruments.
• A share of real estate assets is added, calculated on the value of the properties (generally through the revalued cadastral income), net of the outstanding mortgage on the first home and of a further allowance.
• The resulting total is divided by the equivalence parameter corresponding to the composition of the household.

The result is a figure in euros: the lower it is, the wider the range of benefits you can access. The specific thresholds vary from benefit to benefit and change over time: it is always advisable to check them directly with the granting body or on the INPS website.

How to Submit the Single Substitute Declaration (DSU)

The ISEE is obtained by submitting the DSU — Single Substitute Declaration — which gathers all the household's data. As a rule, it can be completed and submitted:

• Online on your own, through the INPS portal using SPID, CIE or CNS credentials.
• Through a CAF (Tax Assistance Centre), which provides free assistance with the paperwork.
• Through a patronato welfare assistance office or, in some municipalities, directly at the social services desk.

Once submitted, INPS processes the declaration and issues the ISEE certificate, which shows the calculated value and remains valid until 31 December of the year in which it was submitted. Those whose income situation changes during the year can, in some cases, request a current ISEE, updated with more recent data.

The ISEE and Buying a Home: When It Becomes Relevant

In the real estate context, the ISEE comes into play above all for accessing public grants for the purchase of a first home, subsidised mortgages arranged with banks or regional bodies, and public housing programmes. In Umbria, as in the rest of Italy, municipalities and the Region periodically make funds or benefits available for specific categories — young couples, large families, buyers of properties in historic town centres — which require the submission of the ISEE certificate. It is worth checking with your municipality of residence whether such schemes are open: they often go unnoticed.

What to have on hand before submitting the DSU

• Tax codes (codici fiscali) of all members of the household.
• Income tax returns or Certificazione Unica forms for the household members who earn income.
• Bank statements or the average annual balance of current accounts and investments.
• Cadastral data for any properties owned (cadastral survey report) and, if applicable, the outstanding balance of the mortgage on the primary residence.
• Any certifications of invalidity or disability, which may affect the equivalence coefficient.

Every family situation has its own particularities — households with shared children but separated parents, de facto cohabitation, inherited properties — which can significantly affect the calculation. To avoid missing out on benefits you are entitled to, or to assess your situation before a purchase, our advice is to contact a CAF (tax assistance centre), an accountant, or the municipal offices directly. If you are considering a property purchase in the Todi area or in Umbria and want to understand which benefits may apply to your case, we are happy to guide you and, if necessary, refer you to the right professionals.