Confirmo el deducible en la sucursal de devolución.

Because confirmo is the first-person singular present tense form of confirmar.

• yo confirmo = I confirm
• tú confirmas = you confirm
• él/ella confirma = he/she confirms

Spanish often leaves out the subject pronoun, so Confirmo... already means I confirm... without needing yo.

Spanish commonly drops subject pronouns when the verb ending already makes the subject clear.

So:

• Confirmo el deducible... = I confirm the deductible...
• Yo confirmo el deducible... = also correct, but more explicit

Including yo can add emphasis, contrast, or clarity, but in normal speech it is often omitted.

Deducible usually means deductible, especially in insurance or car-rental contexts.

The article el is used because Spanish usually includes the definite article where English may or may not use the. So:

• el deducible = the deductible

Even if English might sometimes just say deductible, Spanish often prefers el deducible as a noun phrase.

Yes, especially in fields like:

• insurance
• car rentals
• damage coverage
• claims

In those contexts, deducible is the normal term for deductible.
A learner may notice that the adjective deducible can also mean deducible in the sense of able to be deduced, but in this sentence the financial meaning is the relevant one.

Here en means something like at or in, depending on the context.

So:

• en la sucursal = at the branch/location/office

Spanish uses en for many location ideas where English might choose in, at, or sometimes on, depending on the situation.

Sucursal usually means branch, branch office, or location of a company.

Depending on context, you might translate it as:

• branch
• office
• store location
• agency location

So la sucursal de devolución likely means the return branch/location, especially in a rental or customer-service setting.

Spanish often uses de + noun to describe the function or purpose of something.

So:

• sucursal de devolución = literally branch of return
• more naturally in English: return branch or return location

This structure is very common in Spanish. Compare:

• tarjeta de crédito = credit card
• centro de atención = service center
• política de cancelación = cancellation policy

Devolución usually means return, give-back, or sometimes refund, depending on context.

In this sentence, because it modifies sucursal, it most likely refers to the place where something is returned:

• sucursal de devolución = return branch/location

If the context were money, devolución could also mean refund.

It is understandable, but whether it sounds fully natural depends on the situation.

A native speaker might also say something like:

• Confirmo el deducible en la sucursal de devolución.
• Confirmo el deducible en la oficina de devolución.
• Confirmo el deducible en la sucursal donde se hace la devolución.

The original sentence is grammatically fine, but sucursal de devolución can sound a bit specialized or business-like. In some real-world contexts, speakers might prefer oficina de devolución or simply lugar de devolución.

Because la sucursal is not a person. The so-called personal a is mainly used before specific human direct objects.

Examples:

• Veo la sucursal. = no personal a
• Veo a Juan. = personal a because Juan is a person

Also, in your sentence, la sucursal is part of a prepositional phrase with en, not a direct object.

Yes, depending on context, confirmo can also sound like:

• I am confirming
• I do confirm
• I confirm it

Spanish present tense is flexible. It can express:

1. simple present

   • I confirm

2. ongoing present, depending on context

   • I’m confirming

3. sometimes an emphatic present

   • I do confirm

In a business or service context, Confirmo... often sounds like a formal statement: I confirm...

Only the verb would change to match the subject:

• Confirmo el deducible... = I confirm...
• Confirmas el deducible... = You confirm...
• Confirma el deducible... = He/She confirms... or You (formal) confirm...
• Confirmamos el deducible... = We confirm...

This is a key feature of Spanish: the verb ending tells you who is doing the action.