Die laatfooi is hoog.

Afrikaans, like Dutch and German, very often forms compound nouns by writing them as a single word.

So:

• laat = late
• fooi = fee / tip, depending on context
• laatfooi = late fee

This is completely normal in Afrikaans. Writing laat fooi as two words would usually look wrong here.

Here, die is the definite article, so it means the.

A useful thing to know is that Afrikaans does not have different words for the based on gender. It just uses die.

It can also be used with singular and plural nouns:

• die boek = the book
• die boeke = the books

So in Die laatfooi is hoog, die simply means the.

Yes, very closely.

is is the present-tense form of wees = to be.

So:

• Die laatfooi is hoog = The late fee is high

It works much like English is in simple statements.

Because hoog is being used as a predicate adjective, not an adjective directly attached to the noun.

Compare:

• Die laatfooi is hoog = The late fee is high
• die hoë laatfooi = the high late fee

In the sentence you gave, hoog comes after the linking verb is, just like in English:

• The fee is high
• not The high is fee

So the structure is:

• Die laatfooi = subject
• is = linking verb
• hoog = predicate adjective

That is because adjectives in Afrikaans often change form depending on where they are used.

After is, you normally use the basic form:

• Die laatfooi is hoog

Before a noun, the adjective often takes an ending:

• die hoë laatfooi

So:

• hoog = used after the verb
• hoë = often used before a noun

This is a very common pattern in Afrikaans.

Both can relate to cost, but they are not always used in exactly the same way.

• hoog = high
• duur = expensive

For amounts, rates, fees, prices, and numbers, Afrikaans often prefers hoog:

• Die prys is hoog = The price is high
• Die laatfooi is hoog = The late fee is high

duur is more often used for something being expensive in general:

• Die boek is duur = The book is expensive

So hoog is very natural with laatfooi.

Sometimes hoog can describe height in the sense of high, but for a person being tall, Afrikaans usually uses lank.

So:

• Die muur is hoog = The wall is high
• Hy is lank = He is tall

That means hoog in your sentence is definitely about the fee being high, not tall.

A rough guide:

• laatfooi ≈ laht-foy
• hoog ≈ hohkh or hoagh

A few notes:

• aa in laat is a long vowel, something like ah
• fooi sounds roughly like foy
• the g in hoog is the throaty Afrikaans/Dutch g, not the English g in go

If you cannot yet make the guttural g, a softer h-like sound is often understood by native speakers.

No, this is a very standard Afrikaans sentence pattern:

• Die laatfooi = subject
• is = verb
• hoog = complement

So it follows the basic main-clause order:

Subject + verb + complement

Very straightforward for learners.

A useful comparison:

• Die laatfooi is hoog.
• Vandag is die laatfooi hoog.

In the second example, Vandag comes first, and the verb is still stays in the second position, which is a very important Afrikaans rule.

In other contexts, die can have other grammatical functions in Afrikaans, but in this sentence it is clearly just the article the.

Because it comes directly before the noun laatfooi, the learner should read it as:

• die laatfooi = the late fee

So there is no special hidden meaning here.