taikin no mae ni dakokusuru koto ni natte imasu.

Normally, it would be written without spaces:

退勤の前に打刻することになっています。

Japanese is usually not spaced word-by-word the way beginner textbooks sometimes show it.

• 退勤 = たいきん
• 打刻する = だこくする

So the full sentence is read:

たいきんのまえに だこくすることになっています。

A natural pitch and pause would be something like:

退勤の前に｜打刻することになっています。

Because 退勤 is being treated as a noun here.

• 退勤 = leaving work / clocking out / going off duty
• 前 = before

When one noun modifies another noun in Japanese, の is often used:

• 退勤の前 = before leaving work

This is the same basic pattern as:

• 会議の前 = before the meeting
• 昼休みの前 = before lunch break

So の connects 退勤 and 前.

前 means before, but に marks the time point at which the main action happens relative to that reference point.

So:

• 退勤の前に = before leaving work
• literally, something like at the point before leaving work

This is a very common pattern:

• 食べる前に = before eating
• 寝る前に = before sleeping
• 会議の前に = before the meeting

Yes. 退勤する前に is also natural.

The difference is about how 退勤 is being treated:

• 退勤の前に: 退勤 is treated as a noun
• 退勤する前に: 退勤する is treated as a verb phrase

Because 退勤 is a verbal noun (a noun that can also combine with する), both patterns can work.

In workplace writing, 退勤の前に sounds concise and formal, which fits this kind of sentence well.

You may also see very compact forms like:

• 退勤前に = before leaving work

especially on notices or company instructions.

打刻する means to record a time stamp, usually for attendance.

In a workplace context, it often means:

• clocking in
• clocking out
• registering your work time with a time card, machine, app, or system

So it is more specific than just pressing a button. It refers to officially recording the time.

Examples:

• 出勤時に打刻する = clock in when arriving at work
• 退勤時に打刻する = clock out when leaving work

〜ことになっています means that it has been مقرر/decided/established as a rule or arrangement. In natural English, it often corresponds to:

• you are supposed to ...
• it is the rule that ...
• it has been arranged that ...

So 打刻することになっています does not just mean someone decided right now. It means there is an existing rule, policy, or standard practice in place.

This pattern is very common for:

• company rules
• school rules
• schedules
• official arrangements

For example:

• 会議は3時から始まることになっています。
  = The meeting is scheduled to start at 3.
• ここでは靴を脱ぐことになっています。
  = The rule here is that you take off your shoes.

Because 〜ことになっている describes a current established state.

Compare:

• 〜ことになる = it gets decided / it will be decided / it comes to be that...
• 〜ことになっている = it has been decided and that decision is now in effect

So:

• 打刻することになります could sound like it will be decided that you should clock in/out or it turns out that...
• 打刻することになっています means that is the rule right now

The 〜ている form often shows a continuing state resulting from some prior change. Here, the rule was set previously, and it is still valid.

This is a very important distinction.

〜ことになっている

An external rule, arrangement, or understood system.

• 退勤の前に打刻することになっています。
  = It is the rule that you clock out before leaving work.

This sounds like a company policy or established procedure.

〜ことにしている

A personal habit, decision, or self-imposed rule.

• 毎朝、日本語を30分勉強することにしています。
  = I make it a rule to study Japanese for 30 minutes every morning.

So in your sentence, ことになっています is used because this sounds like a workplace rule, not a personal choice.

Here, こと turns the action 打刻する into a noun-like idea.

• 打刻する = to clock in/out
• 打刻すること = the act of clocking in/out

This lets the whole action become the thing that is decided/rule-based.

So:

• 打刻することになっています
  = the act of clocking in/out has been established as the rule

This is a very common grammar pattern:

• ここで写真を撮らないことになっています。
  = It is a rule not to take pictures here.
• 毎週報告書を出すことになっています。
  = We are supposed to submit a report every week.

Japanese often leaves the subject unstated when it is obvious from context.

In a workplace notice or instruction like this, the implied subject is usually:

• employees
• staff
• you

So the sentence does not need あなたは or 社員は unless the speaker wants to make it explicit.

That omission is very normal in Japanese.

Yes. It is in polite style because it ends with います.

• 打刻することになっています。 = polite
• 打刻することになっている。 = plain style

This kind of polite form is common in:

• workplace explanations
• manuals
• company notices
• customer-facing instructions

It sounds formal and appropriate for a rule or policy.

Not exactly.

• 帰る = to go home / to leave and return home
• 退勤 = to leave work / finish work / go off duty

A person can 退勤 without necessarily going straight home. The word is specifically about the end of work duties.

That is why 退勤 fits better in a company rule about attendance records.

Yes, in this sentence it is about recording your time before leaving work, so in practice it means clocking out.

That comes from the phrase:

• 退勤の前に = before leaving work

Even though 打刻する by itself can refer to recording time more generally, the context here makes it clear that this is the end-of-work time record.