El franqueo ya está pagado.

Here, franqueo means postage or the postage fee for mailing something.

It does not mean the physical stamp itself. It refers to the mailing charge or the fact that the mailing cost has been covered.

No.

• franqueo = postage, mailing fee, postage payment
• sello = stamp

So a letter may have its franqueo paid by using a sello, a printed label, a meter mark, or some other prepaid system.

Spanish often uses the definite article where English might not.

So El franqueo ya está pagado literally includes the postage, even though English might prefer something shorter like postage paid.

In Spanish, el franqueo sounds natural because it refers to the postage for that specific item.

Ya means already.

It adds the idea that the payment has been completed by now. It emphasizes the current status:

• El franqueo está pagado = The postage is paid
• El franqueo ya está pagado = The postage is already paid

Without ya, the sentence is still correct, just a little less emphatic.

Because estar + past participle is commonly used to describe a resulting state.

Here, the idea is that the postage is now in the state of being paid.

• está pagado = it is paid, it has been taken care of
• es pagado would sound more like a passive construction and is not the natural choice here

So está pagado is the normal way to express the status.

It comes from the verb pagar, and technically it is the past participle.

But in this sentence, it functions like an adjective after estar. It describes the condition of franqueo:

• pagado = paid

So it is verbal in origin, but adjectival in function here.

Because it agrees with franqueo, which is masculine singular.

In Spanish, participles used this way agree in gender and number with the noun they describe.

Compare:

• El franqueo está pagado
• La cuenta está pagada
• Los gastos están pagados
• Las facturas están pagadas

Yes.

You can say:

• El franqueo está pagado
• El franqueo ya está pagado
• El franqueo está ya pagado
• Ya está pagado el franqueo

The original version sounds very natural and neutral. The other versions are possible, but some may sound more emphatic or stylistically marked depending on context.

Yes. It sounds like something you might see on:

• envelopes
• packages
• postal labels
• administrative or mailing notices

It is somewhat formal and postal-specific. In everyday conversation, a person might more often say something like Ya pagué el envío if they mean they already paid for shipping.

Yes, but the focus changes.

• está pagado focuses on the current state: the postage is now paid
• fue pagado focuses on the past action: the postage was paid
• ha sido pagado also focuses on the action, often in a more formal tone

For a label, notice, or status statement, está pagado is usually the most natural choice.

Not exactly.

• franqueo = postage, mailing fee, postal payment
• envío = shipment, delivery, shipping, the act of sending something

So franqueo is more specifically about the postal charge, while envío is broader and often more common in everyday speech, especially for online orders or package shipping.