الدفعة المستحقة في فاتورة المرافق.

Not really. It is a noun phrase, not a full sentence.

It works well as:

• a label on a bill
• a heading
• part of a longer sentence

For example, a full sentence could be:

• يجب سداد الدفعة المستحقة في فاتورة المرافق = the due payment on the utility bill must be paid.

So by itself, it is more like the due payment on the utility bill than a complete statement.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• الدفعة = the payment / installment
• المستحقة = due / payable / owed

Together:

• الدفعة المستحقة = the due payment

This is the normal Arabic word order for noun + adjective.

Because it describes الدفعة, and دفعة is a feminine singular noun.

Arabic adjectives must agree with the noun they describe in:

• gender
• number
• definiteness
• case

So since الدفعة is:

• feminine
• singular
• definite

the adjective must match it:

• المستحقة

If the noun were masculine, you would expect مستحق instead.

Because the noun is definite, and the adjective must match it in definiteness.

So:

• دفعة مستحقة = a due payment
• الدفعة المستحقة = the due payment

In Arabic, when an adjective describes a definite noun, the adjective also takes الـ.

In this context, دفعة most likely means:

• payment
• installment

The word can have other meanings in other contexts, such as:

• a batch
• a push
• a group admitted at one time

But in billing and finance language, دفعة usually refers to a payment amount, often one that is due as part of a bill or plan.

Here مستحقة is functioning as an adjective, meaning something like:

• due
• payable
• owed

It comes from the verb استحقّ, which is related to being deserved or due.

So in this phrase, المستحقة describes the payment as one that is now owed or due.

This is an iḍāfa construction, often called a genitive construction or noun-of-noun structure.

Literally, it is:

• فاتورة = bill / invoice
• المرافق = the utilities / facilities / services

So:

• فاتورة المرافق = the utility bill or more literally the bill of the utilities

A key rule of iḍāfa:

• the first noun usually does not take الـ
• the second noun can be definite
• if the second noun is definite, the whole phrase becomes definite

That is why it is فاتورة المرافق, not الفاتورة المرافق.

Literally, المرافق is the plural of مرفق.

Depending on context, it can mean:

• facilities
• utilities
• public services

In a billing context, it usually refers to utilities, such as:

• water
• electricity
• gas
• similar household services

So in this phrase, فاتورة المرافق is best understood as utility bill.

في literally means in, but in many contexts it can also correspond to English on or within, especially with documents, lists, and records.

So:

• في فاتورة المرافق means something like on the utility bill or in the utility bill

The idea is that the payment is listed in, shown on, or contained within the bill.

This is a normal Arabic usage, even though English would often prefer on rather than in.

Because ة (tāʾ marbūṭa) is often pronounced as -t when the word is grammatically connected to what follows.

So:

• by itself: فاتورة = fātūra
• in iḍāfa: فاتورة المرافق = fātūrat al-marāfiq

This is very common in Arabic:

• pause form: -a
• connected form: -at / -t

A practical pause-form pronunciation is:

ad-dafʿa al-mustaḥaqqa fī fātūrat al-marāfiq

A couple of useful notes:

• الدفعة is pronounced ad-dafʿa, not al-dafʿa, because د is a sun letter, so the l of الـ assimilates.
• فاتورة المرافق is pronounced fātūrat al-marāfiq because the ة becomes t in the iḍāfa connection.

If fully vocalized inside a sentence, the final short vowels could change depending on grammar, but in normal printed Arabic they are usually not written.