Reiseregningen er klar.

It is a compound noun, which is very common in Norwegian:

• reise = travel, trip
• regning = bill, account, invoice

So reiseregning literally looks like travel bill/account, but in real use it often means a travel expense claim or travel reimbursement form/report, depending on context.

With the ending -en, reiseregningen means the travel expense claim/account.

In Norwegian, compound nouns are normally written as one word.

So:

• reiseregning = a travel expense claim
• reise regning would look wrong to most readers

This is different from English, where similar expressions are often written as two words, like travel expenses or expense report. In Norwegian, combining nouns into one word is standard.

The ending -en is the definite article attached to the noun. It means the.

So:

• en reiseregning = a travel expense claim
• reiseregningen = the travel expense claim

This is a very important feature of Norwegian: instead of putting the in front of the noun, Norwegian often adds the definiteness to the end of the noun.

Reiseregningen er klar is a normal statement:

• Reiseregningen = the subject
• er = is
• klar = ready / finished / available

If you say Er reiseregningen klar?, that becomes a yes/no question:

• Is the travel expense claim ready?

So the version with the noun first is a statement, and the version with the verb first is a question.

Here, klar means something like:

• ready
• finished
• prepared
• available for the next step

In this sentence, it usually means the travel claim has been completed or is ready to be processed, submitted, checked, or paid.

So klar is not only about physical readiness. It can also mean that paperwork or a task is complete enough to move forward.

Often yes, but there can be a slight difference in feel.

• ferdig = finished, completed
• klar = ready

In many real situations, both could work:

• Reiseregningen er ferdig.
• Reiseregningen er klar.

A rough difference is:

• ferdig focuses more on the work being completed
• klar focuses more on being ready for use, submission, or the next step

In everyday speech, the difference is often small, and context matters.

Reiseregning is typically a feminine noun: ei reiseregning.

However, in Bokmål, many feminine nouns can also be treated as masculine, so you may also see:

• en reiseregning

In the definite singular, you may therefore encounter both:

• reiseregningen
• reiseregninga

Both are acceptable in Bokmål, depending on style and dialect preference.

In your sentence, reiseregningen uses the common-gender/masculine-style definite ending -en.

Yes. That is a perfectly normal Bokmål variant if you use feminine forms.

Compare:

• reiseregningen = the travel expense claim
• reiseregninga = the travel expense claim

The difference is mainly grammatical style, not meaning.

Very roughly:

• -en often feels more neutral or widespread in formal Bokmål
• -a often reflects feminine gender more clearly and may feel more natural in many dialects

So Reiseregninga er klar and Reiseregningen er klar mean the same thing.

Because Norwegian usually marks definiteness by adding it to the noun itself.

So instead of:

• the travel expense claim

Norwegian uses:

• reiseregningen

This is one of the first big differences English speakers notice. The the is built into the noun.

However, if you add certain modifiers, you can get double definiteness, for example:

• den nye reiseregningen = the new travel expense claim

There, Norwegian uses both:

• a separate definite word: den
• and a definite noun ending: -en

Because it agrees with a singular common-gender noun, and klar is the correct form for that.

Compare:

• Reiseregningen er klar. = singular common gender
• Huset er klart. = singular neuter
• Regningene er klare. = plural

So the adjective changes depending on what it describes.

Here, since reiseregningen is singular and not neuter, klar is the expected form.

A helpful approximate pronunciation is:

RYE-se-rek-ning-en

A few notes:

• reise sounds roughly like RYE-seh
• g in regning is not pronounced as a hard English g
• regning sounds roughly like RENG-ning or REING-ning, depending on accent and carefulness
• the stress is usually strongest near the start of the word

The exact pronunciation varies somewhat by dialect, but that approximation will help you get close.

It is common in work, business, administration, and public-sector contexts.

You are especially likely to see it when talking about:

• employee reimbursement
• business trips
• submitting expenses
• accounting paperwork

So it may not be a word you use every day in casual conversation, but it is very common in office and administrative Norwegian.

You would normally say:

• En reiseregning er klar.

That changes the noun from definite to indefinite:

• reiseregningen = the travel expense claim
• en reiseregning = a travel expense claim

So the sentence pattern stays the same, but the noun changes form depending on whether you mean a or the.