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Upon whom is the prohibition?
- The Rabbis forbad receiving wages for (permissible) work done on Shabbat. 
- The primary prohibition applies to the one receiving the wages; however, it’s also forbidden to pay these wages (for permissible work) because one transgresses “Lifnei Iver”. 
What is included?
- It’s forbidden to receive payment for any service or rental over Shabbat (such as renting one's house for a specific number of days), however, if one purchases something on Shabbat (in cases where it’s permissible) one must pay the amount owed after Shabbat. 
- One may not receive payment for renting out a room for Shabbat specifically, rather one should stipulate that the rental should begin a little before Shabbat or a little after Shabbat and certainly for a few days amongst them Shabbat. 
- One may rent out a car even if the rental is paid per day and includes Shabbat because the rental is paid for every 24 hour day from morning to morning and automatically in the payment for Shabbat is also a few hours after Shabbat. 
Permissible way to receive payment
- It is permissible to receive payment for work done over a period of time such as a month, week, or year even if Shabbat is included.  According to Ashkenazim, this is only true if each side sees it as an agreement which is intended to last, however, if it’s seen as a temporary agreement and the either side could retract and only pay wages for each day, it’s not permissible to receive wages for the Shabbat. 
Chazzan, Bal Koreh, Mashgiach
- A chazzan, bal koreh, or mashgiach who are only working on Shabbat can receive wages, but it’s better that it’s mixed with payment for some work done on a weekday. 
Renting to a non-Jew
- Sephardim may rent to a non-Jew an object on Friday which will be used for a Melacha Deoritta (biblically forbidden activity on Shabbat) as long as the non-Jew has time to remove it from the Jew’s house. Ashkenazim should not rent such an object except on Thursday or earlier in the week. 
Paying for services
- One can pay (after Shabbat) for going into a mikveh on shabbat, or staying at a hotel on Shabbat. 
- One can pay for a ticket to the zoo before Shabbat for a visit on Shabbat (this is only in terms of wages on Shabbat, but in terms of kedushat Shabbat it’s preferable to sanctify Shabbat with Torah and mitzvoth). 
- One can switch a rotation of a guard or cleaning duty to work on Shabbat instead of a weekday. 
Interest over Shabbat
- S”A 306:4, Shemirat Shabbat KeHilchata 28:54
- Mishna Brurah 306:21, Shemirat Shabbat KeHilchata 28:54
- Mishna Brurah 306:19, Shemirat Shabbat KeHilchata 28:57
- Shemirat Shabbat KeHilchata 28:71
- Shemirat Shabbat KeHilchata 28:67
- S”A 306:4, Shemirat Shabbat KeHilchata 28:64 (in the footnote he explains that the gezerah is only because one may could to write down the transaction and the Rabbis didn’t extend it to a case where one receives wages over a period of time because one will not come to write about the transaction of Shabbat specifically).
- Rama 306:4, Mishna Brurah 306:20, Shemirat Shabbat KeHilchata 28:64
- Sh”t Bear Moshe 5:103
- Sh”t Teshuvot Vehanhagot 1:214, Sh”t Bear Moshe 5:102, Shemirat Shabbat Kehilchata 28:67 (based on Mishna Brurah 306:24), Menuchat Ahava 10:28, Kaf Hachaim 306:36.
- Sh”t Yabia Omer O”C 5:25 says that since S”A 585:5 says one won’t see any bracha in the money it implies that it’s not forbidden, however S”A 306:5 is strict about this so perhaps S"A retracted from his stringent position. Yalkut Yosef (Shabbat vol 2, pg 121) writes that the minhag is to be lenient to hire Chazanim just for Shabbat as long as one doesn’t speak about the amount on Shabbat. Nonetheless one doesn’t see Bracha from that money and so one should use that money for buying sefarim or the like. Sh”t Tzitz Eliezer 7:28(7), Sh”T Shevet Hakehati 2:103 say if the chazzan or Rabbi spends time prepares for that Shabbat on the weekday it’s certainly permitted. Sh”t Shaarei Ezra allows a Mohel to accept payment as it’s a dvar mitzvah but preferably he should visit the baby before or after Shabbat so the payment is mixed with permissible payment.
- Menuchat Ahava (vol 1, chap 19 #4) based on S”A and Rama 246:1
- Sh”t Nodeh Beyehuda O”C 26, Sh”T Mishnat Halachot 10:65 since the work to prepare the mikveh before Shabbat and cleaning it after Shabbat is enough so that the payment is considered mixed with permitted payment. Concerning the hotel, so rule Sh”t HaElef Lecha Shlomo 125 since it’s payment for the stay mixed with payment for cleaning the room before and after Shabbat.
- Shemirat Shabbat Kehilchata 28:65
- Shemirat Shabbat Kehilchata 28:55 the work he’s doing isn’t for a wage but just to exempt himself from working another day.
- Shabbat Kehilchata 20:8. [The Mishna Brurah 306:19 writes that one may not take interest from a non-Jew for money lent for Shabbat unless one doesn’t specify a number of days but only a number of weeks.] see Bayit Hayehudi 5:22(11) and BeYitzchak Yikra on Mishna Brurah 306:19