Vi må levere søknaden innen fredag.

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Breakdown of Vi må levere søknaden innen fredag.

• måtte: must
• fredagen: the Friday
• innen: by

Questions & Answers about Vi må levere søknaden innen fredag.

Why is there no "å" before "levere" after må?

Because må is a modal verb, and Norwegian modals take a bare infinitive (no å): må levere.
Use å with non-modals: trenger å levere, prøver å levere, liker å levere.

How strong is må compared to skal, bør, and trenger å?

• må = must/need to (strong obligation/necessity).
• skal = will/is supposed to (plan/arrangement or external obligation).
• bør = should/ought to (recommendation).
• trenger å = need to (practical need; not a modal).
  Forms: må (present), måtte (past), har måttet (perfect).

What exactly does innen fredag mean? Is Friday included?

It means “by Friday,” inclusive. The deadline is no later than Friday (often end of day).
If you want “before Friday (not on Friday),” use før fredag.

Can I say før/på/til/senest fredag instead? What’s the difference?