Tjónamatið byrjar á morgun.

Because Icelandic usually adds the definite article to the end of the noun, instead of using a separate word like English the.

• tjónamat = damage assessment
• tjónamatið = the damage assessment

The ending -ið is the neuter singular definite article here.

It is a compound noun:

• tjón = damage, loss
• mat = assessment, evaluation, estimate

So tjónamat literally means something like damage evaluation/assessment.

Then -ið is added to make it definite:

• tjónamat = damage assessment
• tjónamatið = the damage assessment

That is one of the basic patterns of Icelandic grammar. The definite article is often a suffix, not a separate word.

So instead of:

• English: the damage assessment

you get:

• Icelandic: tjónamatið

This is very common in Icelandic. For example:

• hús = house
• húsið = the house

It is in the nominative singular, because it is the subject of the sentence—the thing that is starting.

In Tjónamatið byrjar á morgun, the structure is:

• Tjónamatið = subject
• byrjar = verb
• á morgun = time expression

Byrja is the infinitive, meaning to start / to begin.

Byrjar is the 3rd person singular present tense form, used because the subject tjónamatið is singular:

• að byrja = to start
• ég byrja = I start
• þú byrjar = you start
• hann/hún/það byrjar = he/she/it starts

Since tjónamatið is grammatically singular, byrjar is the correct form.

Because Icelandic, like English, often uses the present tense for scheduled or expected future events.

So Tjónamatið byrjar á morgun literally uses present tense, but it naturally means that the event starts tomorrow.

This is similar to English sentences like:

• The meeting starts tomorrow.
• School begins next week.

Á morgun is the normal Icelandic expression for tomorrow.

Literally, á often means on, but in this phrase you should learn it as a fixed time expression:

• á morgun = tomorrow

So even though á has its own meaning in other contexts, here the whole phrase works as one expression.

No, they are different:

• á morgun = tomorrow
• í morgun = this morning / in the morning today

That difference is very important.

For example:

• Hann kemur á morgun. = He is coming tomorrow.
• Hann kom í morgun. = He came this morning.

Yes. Icelandic allows some flexibility, but the finite verb usually stays in the second position in main clauses.

So these are both natural:

• Tjónamatið byrjar á morgun.
• Á morgun byrjar tjónamatið.

In the second version, á morgun is moved to the front for emphasis, but byrjar still stays in second position.

In Icelandic compounds, the grammatical gender usually comes from the last part of the compound.

Here the last part is mat, which is a neuter noun. Therefore tjónamat is also neuter.

That is why the definite form is tjónamatið with the neuter article ending.

Yes. That is also correct.

• byrjar = starts / begins
• hefst = begins / commences

Hefst can sound a little more formal or official in some contexts, so it would fit well in news or administrative language.

So both are possible:

• Tjónamatið byrjar á morgun.
• Tjónamatið hefst á morgun.

A rough guide is:

TYOH-na-mah-tith BYR-yar au MOR-kun

A few helpful notes:

• tj is not pronounced like English j. It is more like a ty sound.
• ð at the end of -ið is a soft sound, like th in this.
• byrjar has a y sound that does not match normal English i or u exactly.

You do not need perfect pronunciation right away, but it helps to notice that Icelandic spelling is fairly regular once you learn the sound system.