
reinkommen
to come in
Colloquial for 'hereinkommen' (to come in); to enter a room or building.
Komm rein, die Tür ist offen!
Come in, the door is open!
to come in
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to come in
Colloquial for 'hereinkommen' (to come in); to enter a room or building.
Komm rein, die Tür ist offen!
Come in, the door is open!

to come up
Colloquial for being included or considered in something, for example in an exam or a selection.
Ich hoffe, dass dieses Thema nicht in der Prüfung reinkommt.
I hope this topic doesn't come up in the exam.

to come in
Colloquial for the arrival of money or income.
Sobald das Gehalt reinkommt, bezahle ich die Rechnung.
As soon as my salary comes in, I'll pay the bill.
The word is colloquial. The prefix 'rein-' is a short, informal form of 'herein-'. It expresses movement into a room or area.
Sollen wir schon reingehen oder noch draußen warten?
Should we go in already or wait outside a bit longer?
'Reinkommen' (to come in) is a separable verb. In a main clause, the prefix 'rein' goes at the end. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Er kam leise ins Zimmer rein.
He came quietly into the room.
The perfect tense of 'reinkommen' (to come in) is always formed with the auxiliary verb 'sein' because it describes movement or a change of state.
Bist du gestern gut nach Hause reingekommen?
Did you get home okay yesterday?
In this meaning, it is about abstract things becoming part of a selection or program. Typical contexts are exams, tests, topic lists, or competitions.
Ich habe Glück, mein schlechtestes Thema ist nicht in die Prüfung reingekommen.
I'm lucky, my worst topic didn't come up in the exam.
When it is about money, the subject of the sentence is often 'Geld' (money), 'Gehalt' (salary), or 'eine Zahlung' (a payment). It describes the moment when the money arrives in an account.
Ich kann das Auto erst kaufen, wenn das Geld von der Versicherung reinkommt.
I can only buy the car once the money from the insurance company comes in.
to arrive
For a payment, ankommen emphasizes that the money has reached the recipient. Reinkommen is colloquial and views the same process more as the money being recorded as received or coming in. Reinkommen works well in an informal message about money entering an account.

Ihre Zahlung ist heute bei uns reingekommen.
Your payment came in today.
Ihre Zahlung ist heute bei uns angekommen.
Your payment arrived today.