La baja definitiva desactiva la tarjeta bancaria.

In administrative or customer-service Spanish, dar de baja means to cancel, to deregister, to close, or to deactivate a service/account/card, depending on context.

So la baja is the noun form: the cancellation / the deregistration / the closure.

In this sentence, la baja definitiva means something like permanent cancellation or final closure, not just a temporary pause.

Because baja is a feminine noun in this use, so it takes la.

Spanish articles must match the noun’s gender:

• la baja
• la tarjeta

Even though gender can feel arbitrary to an English speaker, this is simply the standard form you need to learn with the noun.

Definitiva means final, permanent, or definitive.

So:

• baja = cancellation / deregistration
• baja definitiva = permanent cancellation / final closure

This suggests the action is not temporary. A temporary version might be described with words like temporal or expressed differently depending on the service.

In Spanish, adjectives usually come after the noun.

So:

• baja definitiva
• tarjeta bancaria

That is the normal word order. Putting an adjective before the noun is sometimes possible, but it often changes the tone, emphasis, or style. Here, the standard and natural order is baja definitiva.

Desactiva is:

• present indicative
• third person singular
• from the verb desactivar = to deactivate

So grammatically it means:

• it deactivates

The subject is la baja definitiva, which is singular, so the verb is singular too:

• La baja definitiva desactiva...

Spanish often uses the present tense to state:

• general facts
• rules
• procedures
• instructions
• what a system does

So La baja definitiva desactiva la tarjeta bancaria can mean something like:

• Permanent cancellation deactivates the bank card
• If the account is permanently closed, the bank card is deactivated

This present tense is very common in formal notices and system messages.

The subject is La baja definitiva.

That is the thing performing the action:

• La baja definitiva = subject
• desactiva = verb
• la tarjeta bancaria = direct object

So literally, the structure is:

• The permanent cancellation
  • deactivates
    • the bank card

Because la tarjeta bancaria is a direct object referring to a thing, not a person.

Spanish uses the personal a mainly with specific people, and sometimes animals or personified beings:

• Veo a María
• Llamaron al cliente

But with things, you normally do not use a:

• desactiva la tarjeta
• cierra la cuenta
• bloquea el acceso

So desactiva la tarjeta bancaria is exactly what you would expect.

Spanish often uses the definite article where English might not.

Here, la tarjeta bancaria can refer to:

• a specific card already known from context, or
• the card associated with the service/account being discussed

In formal or administrative language, Spanish commonly includes the article:

• la cuenta
• la tarjeta
• el servicio

So even if English might say the bank card or sometimes just your bank card depending on context, Spanish naturally uses la tarjeta bancaria.

Bancaria is the feminine form of the adjective bancario, meaning bank-related or banking.

It agrees with tarjeta, which is feminine:

• tarjeta bancaria
• but documento bancario

So tarjeta bancaria means bank card or banking card. Depending on context, that could refer broadly to a card linked to a bank account.

Yes. In fact, dar de baja is extremely common in Spain.

For example:

• La baja definitiva de la cuenta desactiva la tarjeta bancaria.
• Dar de baja la cuenta desactiva la tarjeta bancaria.

Your original sentence uses the noun la baja, which is very common in notices and formal system language. Spanish often alternates between:

• the verbal expression: dar de baja
• the noun: la baja

Both are very natural.

Yes, it works very much like a common administrative expression.

In service, banking, telecom, insurance, and account-management contexts, you often see things like:

• baja temporal
• baja definitiva
• solicitar la baja
• tramitar la baja

So a learner should think of baja as an important piece of administrative vocabulary in Spain, especially for cancellation or removal from a service.

Usually not in this sentence.

The sentence distinguishes between two actions:

• la baja definitiva = the cancellation/closure
• desactiva = deactivates

So the cancellation is what causes the card to become inactive. Because of that, desactiva is better understood as deactivates, disables, or turns off, not cancels.

Yes. It sounds like the kind of sentence you might see in:

• a banking app
• terms and conditions
• a help page
• an account-closure notice
• an FAQ

It is concise, impersonal, and procedural, which is very typical of formal written Spanish in administrative contexts.