kouzafurikae wa benri desu.

Payment by direct debit is convenient.

Breakdown of kouzafurikae wa benri desu.

• は: topic particle
• です: to be
• 便利べんり: convenient
• 口座振替こうざふりかえ: payment by direct debit

Questions & Answers about kouzafurikae wa benri desu.

How do you read 口座振替は便利です?

It is read:

こうざふりかえ は べんり です

A more natural Japanese writing would usually be written without spaces:

口座振替は便利です。

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What does each part of the sentence mean grammatically?

Here is the breakdown:

• 口座振替 = bank account transfer / direct debit / automatic withdrawal from a bank account
• は = topic marker
• 便利 = convenient
• です = polite sentence ending / polite copula

So the structure is:

[Topic] は [description] です

which is a very common Japanese pattern.

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Why is は used here?

は marks 口座振替 as the topic of the sentence.

So the sentence is basically saying:

As for direct debit, it is convenient.

In more natural English, that becomes:

Direct debit is convenient.

Japanese often introduces what you are talking about first, then comments on it.

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Could I use が instead of は?