Embora o imposto devido diminua, a dívida continua.

Here, embora means although / even though. It introduces a contrast:

• Embora o imposto devido diminua = Although the tax owed decreases
• a dívida continua = the debt continues / remains

So the sentence contrasts two ideas: even if the amount of tax due goes down, the debt still exists.

Be careful: embora can also mean away / off in other contexts, especially in expressions like ir embora = to go away / leave. In this sentence, though, it is a conjunction meaning although.

Because after embora Portuguese normally uses the subjunctive, not the indicative.

• diminui = present indicative
• diminua = present subjunctive

Conjunctions like embora, ainda que, and mesmo que often trigger the subjunctive because they introduce something seen as concessive, hypothetical, uncertain, or not being presented as a simple factual statement.

So:

• Embora o imposto devido diminua... = correct
• Embora o imposto devido diminui... = not standard

Diminua is the present subjunctive, third person singular, of diminuir.

Basic present subjunctive forms of diminuir:

• eu diminua
• você/ele/ela diminua
• nós diminuamos
• vocês/eles/elas diminuam

In this sentence, the subject is o imposto devido, which is singular, so diminua is the correct form.

O imposto devido literally means the tax due or the tax owed.

Breakdown:

• o imposto = the tax
• devido = due / owed

Here devido is acting like an adjective describing imposto. Portuguese often places adjectives after the noun, so:

• imposto devido = tax due
• literally: tax owed

This is very common in formal, legal, financial, or administrative language.

In Portuguese, adjectives often come after the noun, much more commonly than in English.

So:

• imposto devido = tax due
• dívida ativa
• valor total
• prazo final

Sometimes adjective position can change the tone or meaning, but in this case imposto devido is the normal and natural order, especially in formal contexts.

They are related, but not the same thing.

• imposto = tax
• dívida = debt

So o imposto devido refers to the amount of tax that is owed. A dívida refers to the broader debt or outstanding obligation that still remains.

The sentence suggests that even if the tax owed becomes smaller, the debt itself still continues to exist.

Because the subjunctive is triggered by embora only in its own clause:

• Embora o imposto devido diminua → subjunctive
• a dívida continua → indicative

The main clause is being presented as a straightforward statement or fact, so Portuguese uses the indicative:

• continua = present indicative of continuar

This is a very common pattern:

• Embora ele estude muito, não passa.
• Embora esteja cansada, ela trabalha.

The subordinate clause after embora takes the subjunctive, while the main clause usually stays in the indicative.

Because Embora o imposto devido diminua is an introductory subordinate clause. In Portuguese, when a clause introduced by embora comes first, it is normally separated from the main clause by a comma.

So this structure is standard:

• Embora X, Y.

You can think of it as similar to English:

• Although X, Y.

The comma helps mark the contrast and separate the two parts clearly.

Yes. You could also say:

• A dívida continua, embora o imposto devido diminua.

This means the same thing. The difference is mainly emphasis and rhythm.

• Starting with Embora... puts the concessive idea first.
• Starting with A dívida continua... puts more emphasis on the fact that the debt remains.

Both are natural.

Yes, in many contexts you could use them, and they also usually take the subjunctive:

• Mesmo que o imposto devido diminua, a dívida continua.
• Ainda que o imposto devido diminua, a dívida continua.

These are all close to even if / although / even though, but the nuance can vary a little depending on context.

Very roughly:

• embora = very common in formal written Portuguese for although
• ainda que = somewhat formal/literary
• mesmo que = often feels closer to even if

In this sentence, embora sounds very natural and formal.

Portuguese uses definite articles more often than English.

• o imposto devido = the tax owed
• a dívida = the debt

In this sentence, the speaker is referring to specific, identifiable things, so the articles are natural and expected.

Leaving them out would usually sound unnatural here:

• Embora imposto devido diminua, dívida continua = not standard

So yes, Portuguese often keeps articles where English might sometimes omit them.

Yes, it sounds fairly formal, especially because of:

• embora
• imposto devido
• the overall financial/legal tone

This kind of sentence would fit well in:

• tax explanations
• legal writing
• administrative documents
• financial reports

In casual conversation, someone might choose simpler wording, but the sentence itself is perfectly natural in formal Brazilian Portuguese.

A rough pronunciation guide:

• Embora ≈ em-BO-ra
• o imposto devido ≈ oo im-POHS-too deh-VEE-doo
• diminua ≈ jee-mee-NOO-ah or djee-mee-NOO-ah depending on accent
• a dívida continua ≈ a JEE-vee-da con-chee-NOO-a or con-tee-NOO-a depending on accent

A few notes:

• di before a vowel can sound like jee/djee in many Brazilian accents, so dívida often begins something like JEE...
• ti before a vowel can sound like chee/tee depending on region and word environment
• The stress in dívida is on the first syllable: DÍ-vi-da
• The stress in continua is on nu: con-ti-NU-a

If you want, I can also break the whole sentence down syllable by syllable in a more learner-friendly pronunciation format.