Setiap awal bulan, warga di komplek kami membayar iuran kebersihan kepada ketua RT.

It means at the beginning of every month or every early part of the month.

• setiap = every / each
• awal bulan = the beginning of the month

So this phrase refers to a recurring time period. It does not necessarily mean only the first day of the month; it can mean the start of the month in a broader sense.

Indonesian often uses time expressions without a preposition.

So instead of saying something like at every beginning of the month, Indonesian naturally says:

• Setiap awal bulan
• Setiap hari
• Minggu depan
• Tahun lalu

This is normal Indonesian grammar. Time expressions can simply appear at the start of the sentence without a separate word for at.

Here, warga is understood as plural: the residents.

Indonesian often does not mark plural explicitly if the meaning is already clear from context. So:

• warga can mean resident or residents
• in this sentence, because it talks about a general repeated action done by the people in the complex, it is naturally read as residents

If someone really wanted to make it more explicitly plural, they could say para warga, but that is not necessary here.

Not exactly.

• warga = resident, member of a community, citizen
• orang = person / people

In this sentence, warga is better because it refers to people as members of a neighborhood/community, not just random people. So warga fits the context of a housing complex and local neighborhood administration.

It describes which residents we are talking about: the residents in our housing complex.

So the structure is:

• warga = residents
• di komplek kami = in our complex

Together: warga di komplek kami = the residents in our housing complex

The word di marks location, so this phrase tells you where those residents are.

Because kami means we/us/our, excluding the listener, while kita includes the listener.

So:

• komplek kami = our complex but not including you
• komplek kita = our complex including you

If the speaker is talking to someone who does not live there, kami is the natural choice. If the speaker is talking to a fellow resident, kita could be possible.

Yes, both are used.

• kompleks is the more standard spelling
• komplek is very common in everyday Indonesian

In casual speech and writing, komplek is extremely common when referring to a housing complex. In more formal writing, kompleks may be preferred.

Membayar is the standard active verb form.

• bayar = base form / informal form / can also sound like a command depending on context
• membayar = to pay, paying

Because this is a normal declarative sentence in standard Indonesian, membayar is the natural choice.

This is part of the common meN- verb pattern in Indonesian:

• baca → membaca
• beli → membeli
• bayar → membayar

It is a noun phrase made of:

• iuran = contribution, dues, fee
• kebersihan = cleanliness, sanitation

So iuran kebersihan means something like cleaning dues, sanitation fee, or cleanliness contribution.

The word kebersihan comes from:

• bersih = clean
• ke- -an = a noun-forming pattern

So kebersihan literally means cleanliness.

Because kepada is commonly used for the recipient of an action when that recipient is a person.

Here:

• membayar iuran = pay dues
• kepada ketua RT = to the RT head

This is more natural than ke, because ke usually marks movement toward a place or direction.
So:

• ke sekolah = to school
• kepada guru = to the teacher

In this sentence, the money is being paid to a person, so kepada is appropriate.

RT stands for Rukun Tetangga.

It is a very local neighborhood-level community unit in Indonesia. A ketua RT is the head or leader of that neighborhood unit.

So ketua RT is not a mayor or village chief; it is a much more local community role, usually someone responsible for neighborhood administration and coordination.

Because Indonesian does not use articles like English a and the.

So Indonesian often leaves nouns without an article, and the meaning is understood from context.

For example:

• warga = residents / the residents
• ketua RT = the RT head

English needs articles, but Indonesian usually does not.

Yes, that is possible.

• warga di komplek kami = residents in our complex
• warga komplek kami = residents of our complex

Both are understandable and natural. The version with di makes the location relationship more explicit, while the version without di sounds slightly more compact.

So the original sentence is perfectly normal, but it is not the only possible wording.