Rådgiveren kontrollerer inntektsmeldingen og beregningsgrunnlaget.

Because rådgiveren is the definite singular form of rådgiver.

• rådgiver = advisor / adviser
• rådgiveren = the advisor

In Norwegian, the definite article is often added to the end of the noun instead of being a separate word. For many common-gender nouns, that ending is -en.

So:

• en rådgiver = an advisor
• rådgiveren = the advisor

Norwegian usually puts the idea of the onto the noun itself.

So instead of writing a separate word before the noun, Norwegian often uses a suffix:

• rådgiveren = the advisor
• inntektsmeldingen = the income report / income notification
• beregningsgrunnlaget = the calculation basis

This is very normal in Norwegian. English says the advisor, but Norwegian often says the equivalent of advisor-the.

Kontrollerer is the present tense form of the verb å kontrollere.

• å kontrollere = to check / to verify / to inspect
• kontrollerer = checks / is checking

A very important difference from English is that Norwegian verbs do not change according to the subject in the present tense.

So you get:

• jeg kontrollerer = I check
• du kontrollerer = you check
• han kontrollerer = he checks
• vi kontrollerer = we check

The verb form stays the same.

Not usually in the English sense of to control as in to rule or to be in charge of.

In many contexts, å kontrollere means:

• to check
• to verify
• to inspect
• to review

So in this sentence, kontrollerer most likely means checks or verifies, not controls.

This is a useful false-friend warning for English speakers.

It is a compound noun in the definite singular.

You can break it down like this:

• inntekt = income
• melding = message / report / notification
• inntektsmelding = income notification / income report
• inntektsmeldingen = the income notification / the income report

The final part of the compound, melding, is the main noun, so it determines the gender and the ending. Since melding is a common-gender noun, the definite singular ending is -en.

Because beregningsgrunnlag is a neuter noun, not a common-gender noun.

Breakdown:

• beregning = calculation
• grunnlag = basis / foundation
• beregningsgrunnlag = basis for calculation / calculation basis
• beregningsgrunnlaget = the basis for calculation

In Norwegian, the definite singular ending depends on the noun’s gender:

• common gender often takes -en
• neuter often takes -et

So:

• meldingen because melding is common gender
• grunnlaget because grunnlag is neuter

That s is a linking element often used in Norwegian compound nouns.

So:

• inntekt + melding becomes inntektsmelding
• beregning + grunnlag becomes beregningsgrunnlag

This s does not necessarily mean possession. It is often just a normal way of joining the parts of a compound.

Unfortunately, there is not always a simple rule that tells you when the linking -s- must appear, so learners often need to get used to common patterns and learn compounds as vocabulary items.

They are both singular.

Even though the words are long, the endings show that they are singular definite forms:

• inntektsmeldingen = singular definite
• beregningsgrunnlaget = singular definite

If they were plural, they would look different.

For example:

• inntektsmeldinger = income reports
• inntektsmeldingene = the income reports

So in your sentence, the advisor is checking one income report and one calculation basis.

The word order is the normal order for a simple main clause:

• Rådgiveren = subject
• kontrollerer = verb
• inntektsmeldingen og beregningsgrunnlaget = objects

So the pattern is basically:

Subject + Verb + Object

That said, Norwegian main clauses follow the V2 rule, which means the finite verb normally comes in the second position.

In this sentence, the subject comes first, so the verb naturally comes next. If you moved another element to the front, the verb would still stay second:

• I dag kontrollerer rådgiveren inntektsmeldingen og beregningsgrunnlaget.

Yes.

The sentence has one verb, kontrollerer, and two coordinated objects:

• inntektsmeldingen
• beregningsgrunnlaget

They are linked by og = and.

So the structure means:

• The advisor checks the income report
• and checks the calculation basis

Norwegian does not need to repeat the verb here, just like English usually does not.

Because the sentence refers to specific items, not just any income report or any calculation basis.

So Norwegian uses definite forms:

• inntektsmeldingen = the income report
• beregningsgrunnlaget = the calculation basis

If the meaning were more general or indefinite, you would use indefinite forms instead:

• en inntektsmelding = an income report
• et beregningsgrunnlag = a calculation basis

So a more indefinite version would be:

• En rådgiver kontrollerer en inntektsmelding og et beregningsgrunnlag.

That would mean something more like An advisor checks an income report and a calculation basis.

In Norwegian compounds, the last part of the compound decides the gender.

So:

• inntektsmelding ends with melding, which is common gender

  • therefore: en inntektsmelding
  • definite: inntektsmeldingen

• beregningsgrunnlag ends with grunnlag, which is neuter

  • therefore: et beregningsgrunnlag
  • definite: beregningsgrunnlaget

This is a very useful rule for learners: when you see a compound noun, look at the final element.

Possibly, depending on context.

Rådgiver often means:

• advisor
• adviser
• consultant

But in bureaucratic or public-administration contexts, it can sometimes refer to someone whose role overlaps with caseworker, officer, or advisor.

So the exact English word depends on the setting. Grammatically, though, rådgiveren is simply the advisor/adviser.