Bordroya göre bu ay fazla mesai yaptım.

Bordroya göre means according to the payroll / payslip / wage statement.

The word göre is a postposition in Turkish, and it usually requires the noun before it to take the dative ending.

• bordro = payroll, payslip
• bordroya = to/according to the payroll
• göre = according to

So:

• bordroya göre = according to the payroll

This is very common in Turkish:

• bana göre = according to me / in my opinion
• hava durumuna göre = according to the weather forecast
• kurallara göre = according to the rules

Because bordro ends in a vowel, the dative ending appears as -ya:

• bordro + ya → bordroya

It can mean either, depending on context.

In this sentence, bordro most naturally refers to a pay statement, payslip, or salary record—some official record showing work hours or pay.

So Bordroya göre... means something like:

• According to the payslip...
• According to the payroll record...

A native English translation might vary depending on the situation, but the Turkish structure stays the same.

Bu ay is the normal way to say this month when it is used as a time expression.

Turkish often uses bare time words without a case ending:

• bugün = today
• yarın = tomorrow
• bu hafta = this week
• bu ay = this month
• geçen yıl = last year

So:

• Bu ay fazla mesai yaptım. = I worked overtime this month.

Using bu ayda would usually sound unnatural here. The locative -da/-de is not normally needed for this kind of simple time expression.

Yes, fazla mesai is a very common expression meaning overtime.

Literally:

• fazla = extra, too much, excessive
• mesai = work hours / working time / duty time

Together, fazla mesai means extra working time, that is, overtime.

You will often hear:

• fazla mesai yapmak = to do/work overtime
• fazla mesai ücreti = overtime pay
• fazla mesaiye kalmak = to stay for overtime

So in this sentence, fazla mesai yaptım means I worked/did overtime.

Turkish often uses the expression mesai yapmak for to work overtime.

So even though yapmak literally means to do/make, the whole phrase:

• fazla mesai yapmak

means:

• to work overtime

This is a natural Turkish collocation. English and Turkish do not always package actions the same way.

Compare:

• spor yapmak = to do sports / exercise
• alışveriş yapmak = to do shopping
• mesai yapmak = to work / put in work hours
• fazla mesai yapmak = to work overtime

So yaptım here is completely natural.

Yaptım breaks down as:

• yap- = do, make
• -tı- = past tense
• -m = first person singular, I

So:

• yap-tı-m = I did

Because of sound changes, it becomes yaptım, not yaptım with a separate extra sound. This is just the normal form.

In the full sentence:

• fazla mesai yaptım = I did/worked overtime

Because Turkish usually does not need subject pronouns when the verb ending already shows the person.

Here, -m in yaptım already means I.

So:

• fazla mesai yaptım = I worked overtime

You could add ben for emphasis or contrast:

• Ben fazla mesai yaptım. = I worked overtime.

But in a neutral sentence, leaving out ben is more natural.

The sentence is:

• Bordroya göre bu ay fazla mesai yaptım.

A natural breakdown is:

• Bordroya göre = according to the payroll
• bu ay = this month
• fazla mesai = overtime
• yaptım = I did/worked

Turkish often puts the verb at the end, so that part is normal.

A rough word-for-word order would be:

• According to the payroll, this month overtime I-did.

In natural English:

• According to the payroll, I worked overtime this month.

Yes. Turkish word order is flexible, especially with time expressions and introductory phrases.

For example, all of these are possible, depending on emphasis:

• Bordroya göre bu ay fazla mesai yaptım.
• Bu ay bordroya göre fazla mesai yaptım.
• Bu ay fazla mesai yaptım, bordroya göre.
  (less neutral in many contexts)

The original sentence likely puts bordroya göre first to frame the statement as being based on the payroll record.

So the focus is something like:

• According to the payroll...

Not necessarily, but it does show that the statement is being based on a source of information.

So the nuance is:

• According to the payroll, I worked overtime this month.

This may suggest:

• the speaker is checking the record,
• the speaker is reporting what the payslip says,
• or the speaker is relying on official documentation.

It does not automatically mean doubt, but it can create a slightly more detached or document-based tone than simply saying:

• Bu ay fazla mesai yaptım. = I worked overtime this month.

Not exactly.

• Bu ay fazla çalıştım = I worked a lot this month / I worked more than usual this month
• Bu ay fazla mesai yaptım = I worked overtime this month

The first sentence is broader. It just means you worked a lot.

The second specifically refers to overtime, usually beyond normal scheduled work hours.

So if you mean official or actual overtime, fazla mesai yaptım is better.

Sometimes, yes, depending on context.

The Turkish simple past often corresponds to English:

• I did
• sometimes I have done

But in this sentence, the most natural English translation is:

• I worked overtime this month
• or I did overtime this month

Because of the time expression bu ay, English usually prefers a simple past-style translation in this context.

No. Mesai by itself refers more generally to working time, duty hours, or work shift/hours.

Examples:

• Mesai saatleri = working hours
• Mesai bitince = when work ends / after working hours
• Fazla mesai = overtime

So it is fazla mesai specifically that means overtime.

It is mostly neutral.

• bordro is a workplace/payroll word
• fazla mesai is a standard expression
• the grammar is ordinary and natural

So this sentence would fit well in everyday workplace conversation, a discussion about salary, or a comment about a payslip.

It is not slang, and it is not especially formal either.