Recolho o imposto a fim de que tudo funcione.

Recolho is the 1st person singular present indicative of recolher.

So:

• eu recolho = I collect / I gather / I take in

In this sentence, it means I collect the tax. Depending on context, recolher imposto can also be used in administrative or financial language for remitting/paying in a tax to the government, so it has a somewhat official tone.

Portuguese often omits subject pronouns when the verb ending already makes the subject clear.

• Recolho already tells you the subject is I
• So Eu recolho o imposto... is also correct, but eu is not necessary

Adding eu can give extra emphasis or contrast:

• Eu recolho o imposto, não ele.
  = I collect the tax, not him.

Portuguese uses the definite article much more often than English.

So:

• o imposto = literally the tax

Even when English prefers a more general noun like tax, Portuguese often still uses o.

This is very normal and does not always mean one very specific tax in the way English the tax might suggest.

A fim de que means so that, in order that, or for the purpose that.

It introduces a purpose clause:

• Recolho o imposto a fim de que tudo funcione.
• I collect the tax so that everything works.

This expression is correct, but it sounds fairly formal.

It is understood and correct, but it sounds more formal, careful, or bureaucratic than everyday speech.

In conversation, Brazilians would often say:

• para que tudo funcione

So a more common everyday version would be:

• Recolho o imposto para que tudo funcione.

Both mean essentially the same thing here.

Because a fim de que triggers the subjunctive.

After expressions of purpose such as:

• para que
• a fim de que

Portuguese normally uses the present subjunctive.

So:

• funciona = present indicative
• funcione = present subjunctive

Here, funcione is correct because the clause expresses a goal or intended result:

• ...a fim de que tudo funcione
• ...so that everything may work / so that everything works

Funcione is the 3rd person singular present subjunctive of funcionar.

Conjugation:

• que eu funcione
• que você/ele/ela funcione
• que nós funcionemos
• que vocês/eles/elas funcionem

In the sentence, the subject is tudo, which takes 3rd person singular, so:

• tudo funcione

Because tudo means everything, and grammatically it behaves as singular.

So you say:

• Tudo funciona
• Tudo funcione
• Tudo estava bem

Not:

• Tudo funcionam

Broadly yes, but because of the subjunctive, the idea is slightly closer to:

• so that everything will work
• so that everything may function properly
• so that things run smoothly

It expresses an intended outcome, not just a plain statement of fact.

Not directly in this structure.

You can say:

• a fim de que tudo funcione
• para que tudo funcione

But just para tudo funcione is not correct.

If the subject of the second verb is the same and you want an infinitive structure, then para can be used differently. But here the sentence is built with que + subjunctive, so the natural alternatives are:

• a fim de que tudo funcione
• para que tudo funcione

Yes. Portuguese allows some flexibility in word order.

For example:

• A fim de que tudo funcione, recolho o imposto.

This is grammatical and puts more emphasis on the purpose first.

The original order is also perfectly fine.

Yes, fairly formal.

What makes it sound formal:

• a fim de que instead of the more common para que
• the topic itself: imposto
• the verb recolher in an administrative sense

A less formal version might be:

• Eu recolho o imposto para que tudo funcione.

That still sounds fairly serious, but less official.

Yes, depending on context.

In Brazilian Portuguese, recolher imposto can be used in official/financial language to mean:

• to collect tax
• to remit/pay in tax
• sometimes effectively to pay tax to the government

So context matters a lot. The grammar is the same, but the real-world role of the subject changes the interpretation.

This is a very common doubt.

• a fim de = in order to / for the purpose of
• afim = usually an adjective meaning related, similar, or in informal Brazilian Portuguese sometimes interested

Examples:

• Estudo a fim de passar.
  = I study in order to pass.

• Matemática e física são áreas afins.
  = Math and physics are related fields.

So in your sentence, it must be a fim de que, not afim de que.

It is the present indicative, and in Portuguese that can cover several ideas depending on context:

• I collect
• I do collect
• I am collecting

In this sentence, the most natural reading is usually habitual/general:

• I collect the tax so that everything works

But context could make it more immediate.

It can refer to many things, not just machines.

Funcionar can mean:

• to work
• to function
• to operate
• to run properly

It can be used for:

• machines
• services
• systems
• plans
• institutions
• arrangements

So tudo funcione can naturally mean everything functions properly or everything runs smoothly.

Yes, but it is a slightly different structure.

• Recolho o imposto para que tudo funcione.
• Recolho o imposto para tudo funcionar.

The first one, with para que + subjunctive, is the more standard and explicit form.

The second, para + infinitive, can also appear in Portuguese, especially when the meaning is clear, but para que tudo funcione sounds more polished and standard in a sentence like this.

You can sometimes omit the article in Portuguese, but here recolho o imposto is the more natural phrasing.

Using o makes it sound more complete and idiomatic, especially in a formal or institutional sentence.

So:

• recolho o imposto = more natural here
• recolho imposto = possible in some contexts, but less natural in this sentence

A person could say it, but it sounds a bit institutional, political, or administrative rather than casual.

It sounds like something from:

• a speech
• a government explanation
• a formal text
• a civic discussion

In normal conversation, someone might choose a simpler version like:

• Pago imposto para que tudo funcione.
• Recolho o imposto para que tudo funcione.

The exact naturalness depends on who the speaker is and what role they have.