Surat izin itu belum sah kalau belum ada stempel dari kantor fakultas.

Surat izin means permission letter or leave letter.

In Indonesian, it is very common to put two nouns together like this:

• surat = letter
• izin = permission

So surat izin literally means letter of permission, but in natural English we usually say permission letter or sometimes excuse letter, depending on context.

This noun + noun pattern is very common in Indonesian:

• kartu mahasiswa = student card
• rumah sakit = hospital
• kantor pos = post office

Here itu means that, but in sentences like this it often works more naturally as the or that specific one.

So:

• surat izin = a permission letter / permission letter
• surat izin itu = that permission letter / the permission letter

In Indonesian, itu often comes after the noun:

• buku itu = that book
• orang itu = that person
• surat izin itu = that permission letter

In this sentence, it points to a specific letter already known in the situation.

Belum means not yet, while tidak means not.

That difference is very important here:

• belum sah = not valid yet
• tidak sah = not valid / invalid

The sentence is saying the letter is not valid yet because something is still missing. That suggests it can become valid later.

Compare:

• Surat izin itu belum sah. = The permission letter is not valid yet.
• Surat izin itu tidak sah. = The permission letter is invalid.

So belum is the natural choice because the situation can still be completed.

Because the sentence expresses two separate not yet ideas:

• Surat izin itu belum sah = The letter is not valid yet
• kalau belum ada stempel... = if there is not yet a stamp...

So the full logic is:

The permission letter is not yet valid if there is not yet a stamp from the faculty office.

This repetition is normal in Indonesian. It sounds natural because each belum belongs to a different part of the sentence.

Sah means valid, officially valid, or legally/formally recognized, depending on context.

In this sentence, sah means the letter is officially acceptable.

Examples:

• pernikahan yang sah = a legal/valid marriage
• dokumen ini sah = this document is valid
• belum sah = not valid yet

So this is not just about whether the letter exists; it is about whether it is formally accepted.

Because Indonesian often does not use a separate verb equivalent to to be in simple sentences.

So:

• Surat izin itu belum sah literally looks like permission letter that not-yet valid
• but naturally it means That permission letter is not valid yet

This is normal in Indonesian:

• Dia guru. = He/She is a teacher.
• Rumahnya besar. = His/Her house is big.
• Dokumen itu sah. = That document is valid.

English needs is/are, but Indonesian usually does not.

Ada means there is / there are / exists / present.

So:

• ada stempel = there is a stamp / a stamp is present
• belum ada stempel = there is not yet a stamp

This is why the second part means the letter is not valid if the stamp is still missing.

Examples:

• Ada orang di luar. = There is someone outside.
• Belum ada jawaban. = There is no answer yet.
• Tidak ada masalah. = There is no problem.

It means a stamp from the faculty office.

Breaking it down:

• stempel = stamp
• dari = from
• kantor fakultas = faculty office

So this refers to an official stamp issued or provided by the faculty office.

Here dari shows source:

• surat dari dosen = a letter from the lecturer
• izin dari orang tua = permission from parents
• stempel dari kantor fakultas = stamp from the faculty office

Kantor fakultas is a normal Indonesian noun phrase meaning faculty office.

Indonesian often links nouns directly without needing of:

• kantor fakultas = faculty office
• buku pelajaran = textbook
• ruang kelas = classroom

Using kantor dari fakultas would sound less natural here. It is grammatically possible in some contexts, but it is not the usual way to name an office.

So kantor fakultas is the natural compact form.

Kalau usually means if. It introduces the condition.

So:

• Surat izin itu belum sah kalau belum ada stempel... = The permission letter is not valid yet if there is not yet a stamp...

In smoother English, we would usually say:

• The permission letter is not valid until it has a stamp from the faculty office.

So even though Indonesian uses kalau here, the most natural English translation may use if or until, depending on style.

Yes, jika could replace kalau, and the meaning would stay basically the same.

• kalau = if, more common in everyday speech
• jika = if, slightly more formal or written

So:

• Surat izin itu belum sah kalau belum ada stempel... = natural everyday Indonesian
• Surat izin itu belum sah jika belum ada stempel... = also correct, a bit more formal

It is saying the letter is temporarily not valid yet.

That comes mainly from belum:

• belum sah = not valid yet
• belum ada stempel = there is not yet a stamp

This strongly suggests that once the stamp is added, the letter becomes valid.

So the sentence is not rejecting the letter completely; it is saying a required formality has not been completed yet.

A very literal breakdown would be:

• Surat izin itu = that permission letter
• belum sah = not yet valid
• kalau = if
• belum ada = there is not yet
• stempel = a stamp
• dari kantor fakultas = from the faculty office

So a literal translation would be:

That permission letter is not yet valid if there is not yet a stamp from the faculty office.

But in more natural English, we would probably say:

The permission letter is not valid yet unless it has a stamp from the faculty office. or The permission letter is not valid until it has a stamp from the faculty office.