Incluyeron las ganancias patrimoniales como si fueran pérdidas patrimoniales.

Incluyeron is the preterite of incluir, in the 3rd person plural.

So grammatically it means they included. The preterite presents the action as a completed event in the past.

• incluyeron = they included
• incluían = they were including / they used to include

Here, the sentence is talking about a finished act of classification or reporting.

Spanish often omits subject pronouns because the verb ending already shows who the subject is.

• Incluyeron already tells you it is they or, in some contexts, you all
• So ellos incluyeron is usually unnecessary unless the speaker wants emphasis or contrast

With no extra context, an English-speaking learner will normally understand incluyeron here as they included.

In Spain, ganancias patrimoniales is a common tax/legal expression. It refers to capital gains or gains made on assets.

Likewise:

• pérdidas patrimoniales = capital losses

The adjective patrimonial here is not about heritage in a cultural sense. In this context, it relates to assets, property, or estate. So this is specialized financial/tax vocabulary.

In Spanish, adjectives often come after the noun, especially in neutral, factual, or technical language.

So:

• ganancias patrimoniales
• pérdidas patrimoniales

And patrimoniales is plural because it agrees with the plural nouns:

• ganancia patrimonial = singular
• ganancias patrimoniales = plural
• pérdida patrimonial = singular
• pérdidas patrimoniales = plural

This is just normal adjective agreement in Spanish.

This is a very natural question.

In las ganancias patrimoniales, the phrase is the direct object of incluyeron. Spanish often uses the definite article with nouns referring to categories, items, or classes being discussed.

But in como si fueran pérdidas patrimoniales, pérdidas patrimoniales is functioning as a predicate noun after fueran. In this kind of structure, Spanish often omits the article when talking about classification or type.

So the idea is:

• they included the capital gains
• as if they were capital losses

If you added las before pérdidas patrimoniales, it would sound more like you were referring to some specific, already identified capital losses, not just the category.

Como si means as if.

That is different from plain como, which can mean things like:

• as
• like
• in the role of

Here the sentence is not saying they included them as capital losses in a straightforward way. It is saying they treated them as if they were capital losses. That wording suggests the classification was incorrect, unreal, or contrary to the true situation.

So como si is exactly the right structure for as if.

Because como si normally requires the subjunctive, not the indicative.

So Spanish says:

• como si fueran not
• como si eran

After como si, Spanish usually uses the imperfect subjunctive to express an unreal or hypothetical comparison.

That is why you get:

• Lo habla como si fuera experto = He speaks as if he were an expert
• Incluyeron las ganancias patrimoniales como si fueran pérdidas patrimoniales

Even if the main verb is in the present, Spanish still commonly uses the imperfect subjunctive after como si:

• Lo trata como si fuera su hijo

So fueran is not there because the sentence is past. It is there because como si triggers that mood and tense pattern.

Fueran refers back to las ganancias patrimoniales.

The meaning is:

• they included the capital gains
• as if the gains were capital losses

It is plural because ganancias is plural.

Compare:

• la ganancia patrimonial ... como si fuera una pérdida patrimonial
• las ganancias patrimoniales ... como si fueran pérdidas patrimoniales

So the verb agrees with ganancias, not with the people doing the action.

Yes. Fueran and fuesen are both valid imperfect subjunctive forms of ser.

So both are grammatical:

• como si fueran pérdidas patrimoniales
• como si fuesen pérdidas patrimoniales

There is no important difference in meaning here. In modern usage, -ra forms like fueran are often more common, but fuesen is also completely correct.

Because the sentence treats the action as a completed event.

• incluyeron = they included them
• incluían = they were including them / they used to include them

If the speaker wanted to describe a repeated practice, a background situation, or an ongoing process, incluían might be used.

But here the sentence sounds like it is describing a specific completed action, such as a particular filing, report, or accounting decision.

Yes, very strongly.

The structure como si fueran suggests that the gains were treated as though they were losses, which implies they were not actually losses.

So the sentence does not sound neutral. It suggests a mistaken, misleading, or improper classification. In a tax or accounting context, that implication can be especially important.