La reducción fiscal afecta a la base liquidable.

In Spanish, the definite article is often used more than in English, especially with general or technical concepts.

So:

• La reducción fiscal = the tax reduction / tax relief
• la base liquidable = the taxable base / assessable base

Even if English might sometimes omit the, Spanish often keeps it.

Also, both nouns are feminine singular:

• reducción → feminine
• base → feminine

So they both take la.

Fiscal means related to taxes or tax-related.

So reducción fiscal is a technical or formal way to say:

• tax reduction
• tax relief
• tax deduction (depending on context, though this is not always an exact equivalent)

A learner might be tempted to connect fiscal with English fiscal year, and that is fine: the basic idea is the same—something connected with public finances or taxation.

In Spain, fiscal is very common in legal, economic, and administrative language.

Because the verb afectar normally takes the preposition a before its object:

• afectar a alguien
• afectar a algo

So:

• La reducción fiscal afecta a la base liquidable.

This is one of those cases where Spanish and English do not match exactly. In English, you say affect something, but in Spanish you usually say afectar a algo.

This a is part of the verb pattern, not the personal a.

More examples:

• La medida afecta a los trabajadores.
• El cambio afecta a la empresa.

Afecta is:

• third person singular
• present tense
• from the verb afectar

So it means:

• it affects

Here, the subject is La reducción fiscal, which is singular, so the verb must also be singular:

• La reducción fiscal afecta...

If the subject were plural, the verb would change:

• Las reducciones fiscales afectan...

It breaks down like this:

• La reducción fiscal = subject
• afecta = verb
• a la base liquidable = prepositional complement / object introduced by a

So the basic pattern is:

• [Subject] + [verb] + a + [thing affected]

Word-for-word:

• La reducción fiscal = the tax reduction
• afecta = affects
• a la base liquidable = the taxable/assessable base

This is a very normal Spanish sentence structure.

Base liquidable is a tax term. It is not everyday vocabulary.

In Spanish taxation, it usually refers to the amount used for calculating tax after certain adjustments or reductions have been applied. It is a technical concept, so the best translation depends on context.

A rough explanation is:

• base = basis, base amount
• liquidable = able to be assessed/settled for tax purposes

In many contexts, learners will see it contrasted with base imponible.

Very broadly:

• base imponible = the taxable base before some reductions
• base liquidable = the figure after applying certain reductions

The exact legal definition depends on the tax being discussed, but that is the general idea.

Because liquidable and líquida are different words.

• liquidable = capable of being settled, assessed, or calculated
• líquida = liquid / net, depending on context

In tax language, these are not interchangeable.

For example:

• base liquidable = a specific tax concept
• cuota líquida = a different tax concept

So even though they look related, you should learn base liquidable as a fixed technical expression.

No. Spanish has several possible expressions, but they are not always identical in meaning.

Possible alternatives include:

• rebaja fiscal
• alivio fiscal
• reducción de impuestos

Differences:

• reducción fiscal sounds formal and technical
• rebaja fiscal can sound a bit more general or journalistic
• alivio fiscal often suggests relief for taxpayers
• reducción de impuestos is more transparent for learners: literally reduction of taxes

In a legal or administrative context, reducción fiscal fits well.

In Spanish, most adjectives normally come after the noun, especially when they classify the noun rather than add emotion or emphasis.

So:

• reducción fiscal
• base liquidable

Here, fiscal tells you what kind of reduction it is: a tax-related one.

Putting fiscal before the noun would sound unusual in this case. The standard order is definitely:

• reducción fiscal

Yes, in many contexts you can.

• afecta = affects
• sometimes impacts

But affects is the safest and most direct equivalent.

For example:

• La reducción fiscal afecta a la base liquidable.
• The tax reduction affects the taxable base.

If you say impacts, it may sound slightly less technical in English, depending on the context.

You would make the nouns and verb plural where needed:

• Las reducciones fiscales afectan a las bases liquidables.

Changes:

• la → las
• reducción → reducciones
• fiscal → fiscales
• afecta → afectan
• base → bases
• liquidable → liquidables

This is a good example of Spanish agreement:

• articles agree with nouns
• adjectives agree with nouns
• the verb agrees with the subject

It is natural, but it sounds formal and technical, not casual.

You are likely to see this kind of sentence in:

• tax documents
• legal texts
• financial articles
• administrative explanations

In everyday conversation, a speaker might use simpler wording, depending on what they mean. But in official or tax-related Spanish, this kind of phrasing is very normal.