Dien het taxatierapport met het bezwaarschrift in.

Because the verb is indienen, which is a separable verb.

• indienen = to submit
• In a main clause or command, Dutch often splits separable verbs:
  • Dien ... in.

So here:

• dien = the verb part
• in = the separable prefix

This is very common in Dutch:

• aanvragen → Vraag het aan.
• opsturen → Stuur het op.
• indienen → Dien het in.

If the verb is not split, it stays together:

• U moet het taxatierapport indienen.
• ... dat u het taxatierapport indient.

Dien is the imperative form: a command or instruction.

The sentence is giving an instruction, like:

• Submit the appraisal report with the notice of objection.

In Dutch, the imperative often uses the bare stem of the verb:

• lopen → Loop!
• maken → Maak!
• indienen → Dien ... in!

There is no stated subject, but the implied subject is you.

Because in the imperative of a separable verb, the prefix is separated and moved to the end:

• infinitive: indienen
• command: Dien ... in

Also, indien is actually a separate word in formal Dutch meaning if, so learners should be careful not to confuse them.

Because Dutch forms compound nouns very freely, and they are usually written as one word.

So:

• taxatie
  • rapport → taxatierapport
• bezwaar
  • schrift → bezwaarschrift

English often writes these as separate words, but Dutch usually joins them.

A useful rule:

• the last part is the main noun
• the earlier part(s) describe it

So a taxatierapport is a kind of rapport, and a bezwaarschrift is a kind of schrift.

Because both taxatierapport and bezwaarschrift are het-words (neuter nouns).

In Dutch, every singular noun normally takes either:

• de
• het

Here:

• het taxatierapport
• het bezwaarschrift

With compound nouns, the article is determined by the final part of the compound. So:

• rapport is a het word → taxatierapport is also het
• schrift is a het word → bezwaarschrift is also het

Here met means with in the sense of together with or along with.

So the idea is:

• submit the appraisal report together with the notice of objection

It does not mean that the bezwaarschrift is an instrument or tool. It simply means the two documents are submitted together.

Because het taxatierapport is the direct object of the verb indienen, and met het bezwaarschrift is a prepositional phrase adding extra information.

So the structure is:

• Dien = submit
• het taxatierapport = the thing being submitted
• met het bezwaarschrift = together with the objection letter
• in = separable prefix

This is a very normal Dutch word order for a command.

A little, yes, but this version is the most neutral and natural.

For example, Dutch can sometimes move the prepositional phrase for emphasis, but the standard version is:

• Dien het taxatierapport met het bezwaarschrift in.

The most important thing is that in this kind of sentence, the separable prefix in stays at the end.

It sounds like a neutral written instruction, the kind you might see on a form, website, or official letter.

Dutch imperatives like this are common in instructions:

• Vul het formulier in.
• Stuur de bijlagen mee.
• Dien het taxatierapport met het bezwaarschrift in.

So it is not especially conversational; it has the tone of an official instruction.

The structure is:

• Verb: Dien
• Direct object: het taxatierapport
• Prepositional phrase: met het bezwaarschrift
• Separable prefix: in

So, in a simple breakdown:

Dien | het taxatierapport | met het bezwaarschrift | in

This pattern is very useful to recognize in Dutch, especially with separable verbs.