syukuzitu nanode, kyou ha kaisya ni ikanakute sumimasu.

祝日 is read しゅくじつ.

It means a public holiday / national holiday. In Japanese, it usually refers to an officially recognized holiday, not just any day off.

So 祝日なので means because it is a public holiday.

Both なので and だから can mean so / because of that, but they have different tones.

• なので sounds a bit softer and more neutral/polite
• だから sounds a bit more direct and conversational

Also, after a noun like 祝日, なので is very natural:

• 祝日なので = because it is a holiday

You could also hear:

• 祝日だから、今日は会社に行かなくて済みます。

That is also correct, just slightly different in tone.

Because なので already connects properly to a noun by itself in modern Japanese.

With a noun:

• 学生なので
• 祝日なので

Not:

• 学生だなので
• 祝日だなので

Historically, there is a connection to だ, but in actual modern grammar, you simply use noun + なので.

The は marks 今日 as the topic.

So 今日は means something like:

• as for today
• today, ...

It can also carry a slight contrastive feeling:

• today (unlike usual days)

That fits the sentence well, because going to the company is probably normal on other days, but today is different because it is a holiday.

In 会社に行く, the particle に marks the destination.

• 会社 = company / workplace
• 会社に行く = to go to the company / go to work

With verbs of movement like 行く, に often shows the place you go to.

You could also sometimes use へ:

• 会社へ行く

But に is extremely common and natural here.

This is a very common pattern:

• Verb nai-form minus い + くて + 済む
• meaning: to get by without doing ...
• or to not have to do ...

So:

1. 行く = to go
2. 行かない = not go
3. 行かなくて = negative -te form
4. 行かなくて済みます = I can get by without going / I won’t have to go

In this sentence, it means that because it is a holiday, going to work is unnecessary.

Not in this sentence.

By itself, -なくて can sometimes mean:

• not doing X, and...
• or because not doing X...

But here it is part of the fixed expression:

• 〜なくて済む

So you should understand 行かなくて済みます as one unit meaning:

• don’t have to go
• can avoid going

It is not being used as a simple because form here.

The verb 済む literally has meanings like:

• to be settled
• to be completed
• to do without
• to get by

In the pattern 〜なくて済む, the idea is:

• the situation is settled
• without needing to do that action

So:

• 行かなくて済む = things are settled without going
• more naturally: I don’t have to go

It is a very common Japanese way to express that some action became unnecessary.

Japanese non-past forms cover both:

• present
• future

So 済みます can mean:

• do not have to
• will not have to

In this sentence, because 今日 is specified, the meaning is naturally:

• Today, I won’t have to go to work

This is normal Japanese usage.

Yes, 行かないで済みます is also possible.

Both patterns are common:

• 〜ないで済む
• 〜なくて済む

Both usually mean:

• to get by without doing
• to not have to do

In many everyday cases, the difference is very small, and they are often interchangeable.

So these are both natural:

• 会社に行かなくて済みます
• 会社に行かないで済みます

A learner should mainly remember the overall meaning rather than worry too much about a subtle difference here.

Because Japanese often omits information that is obvious from context.

In English, you usually need a subject:

• I don’t have to go to work today

In Japanese, if it is clear who is speaking, 私 is often left out:

• 今日は会社に行かなくて済みます。

This sounds natural and not incomplete.

Literally, 会社 means company.

But in a sentence like 会社に行く, it often naturally corresponds to English go to work, especially when talking about one’s job.

So depending on context:

• literal: go to the company
• natural English: go to work

That is why the sentence may be translated naturally as I don’t have to go to work today.

Yes, it is polite.

The politeness comes from 済みます, which is the ます-form of 済む.

A plain version would be:

• 祝日なので、今日は会社に行かなくて済む。

That sounds less polite and more casual.

Yes. In casual speech, people might shorten or slightly rephrase it, for example:

• 祝日だから、今日は会社に行かなくて済む。
• 今日祝日だから、会社行かなくて済む。
• 祝日だから、今日会社行かなくていい。

The last one, 行かなくていい, also means don’t have to go, but it is a different grammar pattern from 行かなくて済む.

Both can mean don’t have to go, but the nuance is a little different.

• 行かなくていいです = it is okay not to go / you don’t need to go
• 行かなくて済みます = you can get by without going / you are spared from going

So 済みます often suggests a feeling that the action was avoided or turned out to be unnecessary because of some circumstance.

In this sentence, because it is a holiday, the speaker is essentially spared the need to go to work. That makes 済みます a very good fit.