La autoliquidación de la tasa contiene la tasa municipal.

Autoliquidación is a formal administrative/tax term in Spain. It usually means a self-assessment: a form or procedure where the person calculates the amount they owe themselves and then submits or pays it.

So here it does not mean a general liquidation in the everyday English sense. It is more like:

• self-assessment
• self-calculated tax/fee declaration
• sometimes, depending on context, payment form or assessment form

It is a specialised bureaucratic word, and learners often will not meet it in everyday conversation.

In many contexts, tasa can mean rate, but in Spanish administrative language, tasa often means a fee or charge paid to a public authority.

So in this sentence, tasa is probably not rate. It is much more likely to mean:

• fee
• municipal fee
• official charge

This is very common in Spain in government or council paperwork.

This is a very useful question, especially in Spain.

• tasa = a fee/charge connected to a public service or administrative act
• impuesto = a tax in the broader sense

Very roughly:

• tasa: you pay it because of a specific service, document, permit, or use of a public service
• impuesto: a general tax, not always linked to a direct service

So tasa municipal usually means a municipal fee charged by the local council, not necessarily a general tax.

Spanish often uses definite articles more than English does.

Here we have:

• La autoliquidación = the self-assessment / the form
• de la tasa = of the fee / for the fee
• la tasa municipal = the municipal fee

In English, we might sometimes drop an article, but Spanish often keeps it. That is normal.

Also, the article helps specify that we are talking about a particular administrative item, not just the concept in general.

Because tasa is a feminine noun.

• de + el = del
• de + la = de la

So:

• del impuesto is correct because impuesto is masculine
• de la tasa is correct because tasa is feminine

That is why you get de la tasa, not del tasa.

Not really possession in the usual sense.

In la autoliquidación de la tasa, the phrase de la tasa identifies what kind of self-assessment it is. It means something like:

• the self-assessment for the fee
• the self-assessment of the fee
• the fee self-assessment form

So de here links the two nouns and tells you what the self-assessment relates to.

Because in Spanish, adjectives usually come after the noun.

So:

• tasa municipal = municipal fee
• impuesto local = local tax
• norma administrativa = administrative rule

This is the normal word order in Spanish. English usually puts the adjective before the noun, but Spanish usually puts it after.

It actually does agree in number, but its masculine and feminine singular forms look the same.

Compare:

• municipal = masculine singular
• municipal = feminine singular
• municipales = plural

So:

• el impuesto municipal
• la tasa municipal
• las tasas municipales

That is why it stays municipal with tasa.

Contiene literally means contains, from the verb contener.

But in administrative or formal contexts, English may sometimes sound more natural with:

• includes
• covers
• contains

So although contains is a direct translation, a more natural English version in official paperwork might sometimes be includes.

Learners should know both ideas:

• literal meaning: contains
• context-friendly meaning: includes

It is understandable, but it sounds quite bureaucratic and a little repetitive because tasa appears twice.

That is not unusual in official language. Administrative Spanish often repeats key legal terms for precision.

A more natural everyday-style sentence might use different wording, but official documents often prefer exact terminology over elegance.

So yes, it is possible Spanish, but it sounds like paperwork rather than normal conversation.

Because the noun is feminine: la autoliquidación.

Many nouns ending in -ción are feminine in Spanish, for example:

• la declaración
• la administración
• la liquidación
• la autoliquidación

This is a very useful pattern to remember.

Yes, very much so.

In Spain, combinations like these are often set phrases used in forms, websites, and legal or municipal procedures. A learner should treat autoliquidación as part of the specialised vocabulary of public administration.

So instead of analysing it only word by word, it helps to recognise the whole chunk:

• autoliquidación de la tasa

as something like:

• fee self-assessment
• self-assessment form for the fee

Usually not, unless they are specifically talking about paperwork, taxes, or a town hall procedure.

In normal conversation, people might simplify or paraphrase it. But in official contexts such as:

• council websites
• tax forms
• payment instructions
• legal notices

this kind of language is very common.

So it is useful to learn, but you should recognise it as formal administrative Spanish, not casual everyday speech.