Se a senhora tiver qualquer dúvida sobre a taxa, pode enviá-la por e-mail.

A senhora is a more formal and respectful way to say you when speaking to a woman in Brazilian Portuguese.

A few common levels are:

• você = normal, neutral you
• a senhora = formal/respectful you for a woman
• o senhor = formal/respectful you for a man

Even though it means you, it takes third-person verb forms:

• a senhora tiver
• a senhora pode

So this sentence is polite and appropriate in customer service, business, or formal communication.

Because after se when talking about a possible future situation, Portuguese normally uses the future subjunctive.

So:

• Se a senhora tiver qualquer dúvida... = If you have any questions / If you should have any questions...

This is very common in Portuguese:

• Se você precisar, avise. = If you need anything, let me know.
• Se ele vier, eu falo com ele. = If he comes, I’ll talk to him.

With the verb ter, the future subjunctive form is tiver.

So in this sentence:

• se
  • future possibility -> tiver

The verb ter means to have, and one of its future subjunctive forms is tiver.

Here is the future subjunctive of ter:

• eu tiver
• você tiver
• ele/ela tiver
• nós tivermos
• vocês tiverem
• eles/elas tiverem

This tense can look strange at first because it does not resemble ter very closely. It is related historically to the past tense form teve.

Portuguese often uses the singular where English prefers the plural.

So:

• qualquer dúvida literally = any doubt / any question
• natural English meaning = any questions

This is very common and completely normal in Portuguese. The idea is if you have any doubt at all, which in context is often best translated as if you have any questions.

You could also see:

• quaisquer dúvidas = any questions/doubts

But in everyday Brazilian Portuguese, qualquer dúvida is extremely common and natural.

Literally, dúvida means doubt, but in many contexts it is used more like:

• question
• uncertainty
• something you are unsure about

So in customer-service or instructional language, ter dúvida often means:

• to have a question
• to be unsure about something

That is why qualquer dúvida is very often translated naturally as if you have any questions.

Sobre means about / regarding, and a taxa means the fee / the rate / the charge, depending on context.

So:

• dúvida sobre a taxa = a question about the fee

The exact translation of taxa depends on the situation:

• bank fee
• service fee
• charge
• rate
• tax-like fee in some contexts

It does not always mean tax in the English sense. Very often it means fee or charge.

Portuguese often uses the present tense to express something that English might also express with can, may, or sometimes even will be able to.

So:

• pode enviá-la por e-mail = you can send it by email

Using pode here sounds natural, direct, and polite.

Poderá is the future tense of poder, and it can sound more formal, more distant, or more bureaucratic:

• poderá enviá-la por e-mail

That is possible, but pode is more common and natural in many everyday formal contexts.

Enviá-la is made of two parts:

• enviar = to send
• la = it (feminine direct object pronoun)

So enviá-la means to send it.

The hyphen appears because in Portuguese, object pronouns can attach to the end of an infinitive:

• enviar + a -> enviá-la

There is also a spelling change:

• the final r of enviar drops
• the vowel before it gets an accent: enviá-
• then the pronoun is attached: enviá-la

This is standard written Portuguese.

It refers to dúvida, because dúvida is a feminine singular noun.

So:

• a dúvida
• enviá-la = send it / send the question

That is why the pronoun is la and not lo.

Compare:

• o documento -> enviá-lo = send it
• a mensagem -> enviá-la = send it

Yes, it is natural in Portuguese.

Portuguese often says things like:

• Se tiver alguma dúvida, pode enviar por e-mail.
• Em caso de dúvida, mande uma mensagem.

In English, we might more naturally say:

• If you have any questions, you can email us.
• If you have any questions about the fee, feel free to send them by email.

So the Portuguese phrasing is normal, even if the most natural English translation may be slightly different.

Because por here expresses the means or method: by email, via email.

So:

• por e-mail = by email
• por telefone = by phone
• por mensagem = by message

Para usually means to / toward / for, so it would not work well here for the method of sending.

Yes. You could say:

• Caso a senhora tenha qualquer dúvida sobre a taxa, pode enviá-la por e-mail.

This is also correct, but it sounds a bit more formal or written.

There is also a grammar difference:

• after se in this future-type condition, Portuguese uses the future subjunctive: tiver
• after caso, Portuguese uses the present subjunctive: tenha

So both are correct, but they use different subjunctive forms.

Yes. You could say:

• Se você tiver qualquer dúvida sobre a taxa, pode enviá-la por e-mail.

That is grammatically correct and very natural, but less formal.

Notice that the verbs stay the same:

• você tiver
• você pode

That is because você, like a senhora, takes third-person singular verb forms in Brazilian Portuguese.