Saya hampir lupa membayar iuran kebersihan bulan ini.

Hampir means almost or nearly.

So Saya hampir lupa membayar iuran kebersihan bulan ini means the speaker almost forgot to pay the cleaning fee this month.

A useful pattern is:

• hampir + verb/adjective

Examples:

• Saya hampir jatuh. = I almost fell.
• Dia hampir terlambat. = He/She was almost late.
• Saya hampir lupa. = I almost forgot.

In your sentence, hampir modifies lupa, so the idea is almost forgot, not almost paid.

In Indonesian, lupa can be followed directly by a verb to mean forget to do something.

So:

• lupa membayar = forget to pay
• lupa membawa dompet = forget to bring a wallet
• lupa menelepon = forget to call

This is very natural Indonesian. English usually needs to: forget to pay, but Indonesian often just places the verb after lupa without any extra word.

You may also hear:

• lupa untuk membayar

That is possible, but in everyday speech lupa membayar is simpler and more common.

Membayar is the meN- form of bayar and is the standard verb form meaning to pay.

• bayar = the root word
• membayar = to pay

In formal or neutral Indonesian, membayar is the expected form in a sentence like this:

• Saya membayar iuran. = I pay / I am paying the fee.

In casual speech, people often shorten it:

• Saya hampir lupa bayar iuran kebersihan bulan ini.

That sounds natural in conversation, but membayar is more complete and standard.

Iuran means a fee, contribution, or dues that people regularly pay, often as part of a group, neighborhood, or organization.

Kebersihan means cleanliness.

So iuran kebersihan is literally cleanliness fee, but in natural English it often refers to something like:

• a neighborhood cleaning fee
• sanitation dues
• a community cleaning contribution

In Indonesia, this can refer to a regular payment for things like trash collection, neighborhood cleaning, or local maintenance related to cleanliness.

Bulan ini means this month, and putting time expressions near the end of the sentence is very common in Indonesian.

So:

• Saya hampir lupa membayar iuran kebersihan bulan ini.

is completely natural.

The sentence flows like this:

• Saya = I
• hampir lupa = almost forgot
• membayar iuran kebersihan = to pay the cleaning fee
• bulan ini = this month

You can think of bulan ini as giving the time frame for the payment.

Indonesian time expressions are fairly flexible, though. For example, you could also say:

• Bulan ini saya hampir lupa membayar iuran kebersihan.

That puts extra emphasis on this month.

Yes, you could, and it would still be understood.

However, untuk is usually not necessary here. The more natural and common version is:

• Saya hampir lupa membayar iuran kebersihan bulan ini.

Adding untuk can sound slightly more formal or more explicitly structured:

• Saya hampir lupa untuk membayar...

But in everyday Indonesian, people usually prefer the shorter version without untuk after lupa.

Yes.

• Saya is neutral and polite.
• Aku is more casual and personal.

So you could say:

• Aku hampir lupa membayar iuran kebersihan bulan ini.

That would sound natural in informal conversation.

A very casual spoken version might even be:

• Aku hampir lupa bayar iuran kebersihan bulan ini.

So the choice depends on the situation:

• use saya in formal, polite, or neutral contexts
• use aku with friends, family, or in relaxed speech

Yes, the meanings are different.

• lupa membayar = forgot to pay
• belum membayar = have not paid yet

This is an important distinction.

If you say:

• Saya lupa membayar iuran kebersihan bulan ini,
  it means you were supposed to pay, but it slipped your mind.

If you say:

• Saya belum membayar iuran kebersihan bulan ini,
  it only means the payment has not happened yet. It does not necessarily mean you forgot.

So lupa refers to memory; belum refers to something not yet completed.

That would change the meaning and sound odd in this context.

In the original sentence:

• hampir lupa = almost forgot

If you say:

• lupa hampir membayar

it would suggest something like forgot that you almost paid, or it creates a confusing structure that does not express the intended idea well.

So if you want to say I almost forgot to pay, keep hampir before lupa:

• Saya hampir lupa membayar...

That is the natural order.

It is a fairly common and understandable expression, especially in neighborhood or community contexts.

Many Indonesian neighborhoods have regular local fees, and these may be called things like:

• iuran kebersihan = cleaning/sanitation fee
• iuran sampah = trash fee
• iuran warga = residents' dues
• iuran keamanan = security fee

The exact term can vary by area, but iuran kebersihan is not strange. A native speaker would understand it as some kind of regular fee related to keeping the environment clean.

Yes, definitely. It sounds natural.

The sentence as given is clear, grammatical, and normal:

• Saya hampir lupa membayar iuran kebersihan bulan ini.

In everyday spoken Indonesian, people might make it a little more casual:

• Aku hampir lupa bayar iuran kebersihan bulan ini.
• Wah, aku hampir lupa bayar iuran kebersihan bulan ini.

So the original sentence is a good standard version, and casual speech often just drops some formality.

A useful word-by-word breakdown is:

• Saya = I
• hampir = almost
• lupa = forget / forgot
• membayar = to pay
• iuran kebersihan = cleaning fee / sanitation dues
• bulan ini = this month

A more natural English rendering would be:

• I almost forgot to pay the cleaning fee this month.

This is a good example of how Indonesian often uses a very direct structure:

• subject + almost + forget + verb + object + time

Even though the Indonesian and English structures are not identical, the sentence maps quite neatly once you know the pattern lupa + verb.