hanbaitesuuryou ga takai.

It is read:

はんばいてすうりょう が たかい。

Breakdown:

• 販売 = はんばい
• 手数料 = てすうりょう
• 高い = たかい

A learner might notice that 手数 can sometimes be read in other ways in other words, but in 手数料, the standard reading is てすうりょう.

販売手数料 is a noun.

It is a compound noun made from:

• 販売 = sale / selling
• 手数料 = fee / commission / handling charge

Together, it refers to a sales commission or selling fee, depending on context.

が marks 販売手数料 as the thing being described by 高い.

So structurally, the sentence is:

• 販売手数料 = the sales commission
• が = subject marker
• 高い = is high / expensive

In simple adjective sentences like this, が often marks the thing that has the property.

Yes, 販売手数料は高い is also natural.

The difference is mostly about focus:

• 販売手数料が高い
  Focuses on the sales commission as the thing that is high.
• 販売手数料は高い
  Sets the sales commission as the topic and says, as for that, it is high.

Very roughly:

• が can sound more like identifying or emphasizing the subject.
• は can sound more like making a statement about a known topic, or contrasting it with something else.

In many everyday situations, both are possible.

高い can mean both:

• high in height or level
• expensive / costly

With prices, fees, rates, and commissions, 高い often means high in amount, which in English may also feel like expensive.

So in this sentence, it does not mean physically tall. It means the commission/fee amount is high.

In Japanese, the main predicate usually comes at the end of the sentence.

Here, 高い is the predicate. It tells you the key information about 販売手数料.

This is very normal Japanese word order:

• [noun] が [adjective]
• 販売手数料 が 高い

Yes. 販売手数料が高い。 is a complete casual/plain sentence.

Japanese sentences often end with:

• a verb
• an い-adjective
• a noun + だ / です
• a な-adjective
  • だ / です

Since 高い is an い-adjective, it can end the sentence by itself in plain style.

If you want to make it more polite:

• 販売手数料が高いです。

高いです is correct and very common.

What is true is that you do not say:

• 高いだ ✘

But you can say:

• 高い。 plain
• 高いです。 polite

So for this sentence:

• 販売手数料が高い。 plain
• 販売手数料が高いです。 polite

Use the negative form of 高い:

• 販売手数料が高くない。 = plain negative
• 販売手数料が高くないです。 = polite-ish conversational negative
• 販売手数料が高くありません。 = more formal polite negative

The key change is:

• 高い → 高くない

Use the past form of 高い:

• 販売手数料が高かった。 = plain past
• 販売手数料が高かったです。 = polite conversational
• In some contexts, people may prefer more formal phrasing depending on the situation.

The pattern is:

• 高い → 高かった

It is normally treated as one noun phrase.

So in this sentence:

• 販売手数料 is one unit
• が attaches to that whole noun phrase
• 高い describes that whole noun phrase

You would not normally separate 販売 and 手数料 here unless you were intentionally rephrasing the sentence.

Because 高い is an adjective, not a transitive verb.

This sentence is just describing a property:

• The sales commission is high.

There is no action being done to something, so no direct object is needed.

Yes, it easily can, depending on tone and context.

A short sentence like 販売手数料が高い。 can sound like:

• a neutral observation
• a business assessment
• a complaint that the fee is too high

Japanese often leaves emotional force to context, tone, and situation rather than changing the grammar much.

Yes, but it sounds a bit context-based and somewhat business-like because 販売手数料 is a formal term.

It would sound natural in contexts like:

• business discussions
• online selling
• contracts
• platform fees
• finance/accounting talk

In casual conversation, people might choose a simpler expression if the situation allows it, but grammatically this sentence is perfectly natural.

The pattern is:

[noun] が [い-adjective]

In this sentence:

• 販売手数料 = noun
• が = subject marker
• 高い = い-adjective

This is one of the most basic Japanese sentence patterns for describing something.

Other examples of the same pattern:

• 値段が高い。
• 家賃が安い。
• 音が大きい。

So this sentence follows a very common and useful structure.