A inadimplência está alta este mês.

Because inadimplência is a feminine singular noun, and in Portuguese it is very common to use the definite article with abstract nouns when speaking about them in a general or known context.

So a inadimplência means something like delinquency / non-payment rates / default levels as a concept relevant to the situation.

In English, we often leave the article out with abstract nouns, but Portuguese uses articles more often.

Inadimplência is a fairly formal financial term. It refers to failure to pay what is owed, especially bills, loans, installments, rent, or other financial obligations.

Depending on context, it can mean:

• default
• non-payment
• delinquency
• late-payment levels

It is common in banking, business, real estate, and news about the economy.

It uses está because the sentence is describing a current condition or situation, not a permanent characteristic.

• estar = to be, in a temporary or changeable state
• ser = to be, in an essential, defining, or more permanent sense

Here, the idea is that the non-payment rate is high this month, so it is treated as a current state:

• A inadimplência está alta este mês.

If you used é, it would sound less natural in this context.

Because alta agrees with inadimplência, which is a feminine noun.

In Portuguese, adjectives usually match the noun in gender and number:

• inadimplência = feminine singular
• so the adjective must also be feminine singular: alta

If the noun were masculine, you would normally use alto.

Yes. Alta literally means high, but in this kind of sentence it means at a high level.

Portuguese often uses alto/alta with things like:

• preço alto = high price
• temperatura alta = high temperature
• taxa alta = high rate
• inadimplência alta = high default / delinquency rate

So it is not about physical height here. It means the level is high.

Este mês means this month.

In Brazilian Portuguese, este and esse are often used less strictly in everyday speech than traditional grammar suggests. In formal grammar:

• este is closer to the speaker or present moment
• esse is a little more removed

Because the sentence refers to the current month, este mês fits very well.

In everyday Brazilian speech, many people would also say esse mês, and it may sound very natural depending on region and style.

Yes. That is completely natural.

Portuguese allows flexible word order, especially when you move a time expression to the front for emphasis:

• A inadimplência está alta este mês.
• Este mês, a inadimplência está alta.
• Esse mês, a inadimplência está alta.

All of these are possible. The meaning stays basically the same.

Yes, it sounds somewhat formal or technical because of the word inadimplência.

You are likely to hear it in:

• financial reports
• business meetings
• banking contexts
• news about the economy
• real estate or credit discussions

In more everyday speech, people might use simpler expressions such as:

• Tem muita gente atrasando pagamento este mês.
• O número de atrasos está alto este mês.
• Tem muito cliente inadimplente este mês.

It is usually more general and abstract. It refers to the phenomenon or rate of non-payment, not usually to one specific person.

For one person, Portuguese more often uses:

• inadimplente = a person who has not paid
• cliente inadimplente = delinquent customer / customer in default

So:

• A inadimplência está alta = the non-payment/default level is high
• Há muitos inadimplentes = there are many people in default

Normally, no. That sounds unnatural in standard Portuguese.

With a noun like inadimplência, Portuguese usually wants the article:

• A inadimplência está alta este mês.

Leaving it out might appear in headlines or very condensed styles, but in normal speech and writing, the article is expected.

In Brazilian Portuguese, it is approximately:

ee-nah-jeem-PLEN-see-ah

A more careful breakdown:

• i = like ee
• na
• dim often sounds closer to jeem in Brazilian pronunciation because di before i often becomes a jee sound
• plên
• cia sounds like see-ah

The stress falls on plên:

• ina-dim-PLÊN-cia

Yes. Elevada is possible and often sounds a bit more formal or written.

For example:

• A inadimplência está elevada este mês.

Both are correct:

• alta = very common, natural
• elevada = slightly more formal, technical, or report-like

To make it a question, you can keep the same word order and use intonation or a question mark:

• A inadimplência está alta este mês?

To make it negative, add não before the verb:

• A inadimplência não está alta este mês.

This is very common in Portuguese:

• statement: está
• negative: não está
• question: same structure, just with question intonation or punctuation