Ons gaan die betalingspertyd na.

Not in this sentence.

Here gaan ... na belongs together as the separable verb nagaan, which means to check, to examine, to review, or to verify.

So:

• Ons gaan die betalingspertyd na. = We check / review the payment period/deadline.

This is not the future construction gaan + infinitive.

Compare:

• Ons gaan die betalingspertyd na.
  = We check the payment period.
• Ons gaan die betalingspertyd nagaan.
  = We are going to check the payment period.

That difference is very important.

Because nagaan is a separable verb.

In a normal main clause, the verb splits into:

• the conjugated part: gaan
• the particle: na

So:

• nagaan → gaan ... na

That is why na comes at the end.

This is similar to separable verbs in Dutch and somewhat like phrasal verbs in English, although the grammar is different.

No.

Although na can mean after as a preposition in other contexts, here it is not functioning independently. It is just the second part of the separable verb nagaan.

So in this sentence, you should understand:

• gaan ... na = check / review

not

• gaan = go
• na = after

Trying to translate the parts separately will be misleading here.

Ons can mean both we and us, depending on its role in the sentence.

Here it is the subject, so it means we:

• Ons gaan die betalingspertyd na. = We check the payment period.

As an object, ons can mean us:

• Hy sien ons. = He sees us.

Afrikaans uses the same form for both.

No. Afrikaans is much simpler here.

Die is the normal definite article meaning the, and it does not change for:

• gender
• case
• usually number in the way English learners might expect from languages like German

So:

• die man = the man
• die vrou = the woman
• die kinders = the children

In your sentence:

• die betalingspertyd = the payment period/deadline

It is a compound noun, which is very common in Afrikaans.

It can be broken down into parts like:

• betaling = payment
• betalings- = payment-related / of payment
• pertyd = term / period / deadline-related element

Together, betalingspertyd refers to the payment term, payment period, or possibly payment deadline, depending on context.

A key thing to remember: Afrikaans often writes compounds as one word, where English may use two words or a hyphen.

Afrikaans verbs are much simpler than English verbs.

In the present tense, the verb usually stays the same regardless of the subject:

• Ek gaan
• Jy gaan
• Hy/Sy gaan
• Ons gaan
• Julle gaan
• Hulle gaan

So gaan does not change here just because the subject is ons.

That is one of the easier parts of Afrikaans grammar.

The sentence follows the normal Afrikaans main clause pattern:

• Subject: Ons
• Finite verb: gaan
• Object: die betalingspertyd
• Separable particle: na

So the pattern is:

• Ons | gaan | die betalingspertyd | na

This is typical for separable verbs in main clauses.

When the verb is not split, it appears as nagaan in one piece.

For example:

• Ek dink dat ons die betalingspertyd nagaan.
  = I think that we are checking the payment period.

• Ons wil die betalingspertyd nagaan.
  = We want to check the payment period.

So:

• main clause: Ons gaan die betalingspertyd na.
• joined form: nagaan

This is a very useful pattern to learn, because many Afrikaans separable verbs work like this.

Yes, that is a very common learner confusion.

A beginner might first read:

• Ons gaan ... as We are going ...

But once you see the final na, you should recognize the separable verb:

• nagaan

So the sentence is not about movement. It is about checking/reviewing something.

A good habit is to look at the whole sentence, especially the end, before deciding what the verb means.