Framtalsfresturinn er á föstudag.

Framtalsfresturinn is a compound word with a suffixed definite article:

• framtal = a tax return, income declaration
• frestur = deadline, extension period, time limit
• -inn / -urinn = the

So framtalsfresturinn means the tax-return deadline or the deadline for filing a tax return.

A useful thing to notice is that Icelandic often builds long compound nouns where English would use several separate words.

Because Icelandic very often combines ideas into one noun instead of using a whole phrase.

Here, English might say:

• the tax return deadline
• the deadline for the tax return

But Icelandic packages that into one compound noun:

• framtalsfrestur = tax return deadline
• framtalsfresturinn = the tax return deadline

This is extremely common in Icelandic, so learning to spot the parts of compounds is very helpful.

In Icelandic, the definite article is usually added to the end of the noun as a suffix.

So instead of a separate word like English the, Icelandic often does this:

• frestur = deadline
• fresturinn = the deadline

In your sentence:

• framtalsfrestur = tax return deadline
• framtalsfresturinn = the tax return deadline

This is one of the first big differences English speakers notice in Icelandic grammar.

Because Icelandic often uses the bare weekday name after á when meaning on Friday / on Monday / on Tuesday, etc.

So:

• á föstudag = on Friday

If you say á föstudaginn, that usually sounds more like:

• on the Friday
• this Friday / that Friday, depending on context

So in a simple statement about when something happens, á föstudag is the normal choice.

It is in the accusative singular because of the preposition á in this time expression.

Here:

• nominative: föstudagur = Friday
• accusative: föstudag = Friday

So:

• á föstudag = on Friday

The preposition á can take different cases depending on meaning, so it is important to learn common expressions as fixed patterns. With days of the week in expressions like this, you commonly get á + accusative.

Yes, pretty much.

• er = is
• á föstudag = on Friday

So the structure is very close to English:

• Framtalsfresturinn er á föstudag.
• The tax return deadline is on Friday.

That makes this sentence relatively straightforward once you understand the noun and the weekday form.

Because Icelandic normally does not use a separate definite article before the noun the way English does.

English:

• the deadline

Icelandic:

• fresturinn

The the meaning is already built into the ending -urinn, so adding a separate article would be unnecessary.

In Icelandic, days of the week are normally not capitalized, unless they begin a sentence.

So:

• mánudagur = Monday
• þriðjudagur = Tuesday
• föstudagur = Friday

This is different from English, where weekday names are always capitalized.

A rough pronunciation guide for an English speaker is:

• Framtalsfresturinn ≈ FRAHM-tahls-fres-tur-rin
• er ≈ ehr
• á ≈ ow (longer vowel)
• föstudag ≈ FER-stu-thahg or FUR-stu-thahg depending on accent and how narrowly you want to represent it

A few helpful notes:

• ö does not sound like English o. It is closer to the vowel in French peur or German hören.
• á is a long vowel, roughly like ow in English now, but steadier.
• ll in framtals- is pronounced differently from English ll, but in a simple learner approximation, you can treat it as an l sound.
• The r in Icelandic is typically a trilled or tapped r.

It is basically the normal pattern:

• Framtalsfresturinn = subject
• er = verb
• á föstudag = time phrase

So the sentence follows a simple pattern similar to English:

• The deadline is on Friday.

Icelandic word order can become more flexible in other contexts, but this sentence is a very standard, neutral structure.

In natural English, both The deadline is Friday and The deadline is on Friday are possible.

In Icelandic, the sentence specifically uses:

• á föstudag = on Friday

So the Icelandic structure matches the version with on. Even if English sometimes omits on, Icelandic normally keeps the preposition in this kind of expression.

The dictionary form is:

• föstudagur = Friday

But in the sentence you see:

• föstudag

That happens because Icelandic nouns change form depending on case. After á in this time expression, föstudagur becomes föstudag.

So when you look up words, you usually want the nominative singular form, which for this noun is föstudagur.