Using check cashing services:
Using a check cashing service is for all purposes similar to selling a loan to a third party, and follows all the restrictions relevant to it. The difference between cashing a check by a bank and by a check cashing service is that by a bank, the money is not cleared into your account until the money leaves the check writer’s account. It is hence similar to one who is owed money asking an individual to bring him the money from the person who owes him. However by a check cashing service, the client receives cash on the spot of the transaction, and in exchange for this cash payment he signs over the collection of the check to the check cashing Service Company. Thus, in essence he has sold his check, or his loan document, to the company. Now, as the income for their business, the check cashing service charges a fixed percentage rate towards the check, and hence on every check they make a certain amount of money. For example, on a $1000 check, a service fee of 3% will give the client $970, while the company will eventually collect $1000. This enters one into the Halachic question regarding Ribis. The following is the ruling. These laws must be followed both by the client and by the service owner, if they are Jewish.
A. Gentile check cashing service:
A Jew may use any gentile owned check cashing service, irrelevant of fees, liability and the like.
B. Jewish check cashing service-gentile client:
A Jewish owned check cashing service may charge a gentile client whatever rate he desires for exchange of cashing his check, irrelevant of liability and the like. Furthermore, it is even a positive command to take a surcharge for the exchange.
C. Jewish check cashing service-Jewish client:
Non-postdated check: Some of today’s Poskim rule that Ribis does not apply to a non-postdated check, as it is viewed as cash payment. Majority of today’s Poskim however rule that it is considered like a loan document and hence follows the same laws as a post-dated check, as explained next.
Postdated check [and non-postdated check according to most Poskim]: A Jewish client may not cash a check by a Jewish owned check cashing service unless the Jew does not accept liability for the check’s payment, or the Jew is charged a fixed fee that covers only the expenses of the service [i.e. Sechar Tircha]. Being that all check cashing services make the check holder retain liability to repay the money in the event that the check is not respected, irrelevant of reason, therefore the only option that remains is the second option, which is for the check cash service to charge a fixed fee for their service. Accordingly, it is forbidden for the client to be charged a greater rate for a postdated check, as this reveals that the extra fee is in exchange for the delay of payment. Thus, in summary, a check cashing service may charge only a fixed rate for all checks that they cash, irrelevant of the due date of the check.
Heter Iska: In addition to all the above it is proper for the check cashing service to have a Heter Iska for all of his transactions in order to prevent any issues of Ribis that may come up. [Some check cashing services charge more money for post-dated checks based on a Shetar Heter Iska. One should contact a Rav regarding if such a Shetar should be relied upon.]
Exchange fees: So long as the company has a fixed exchange fee for all checks, whether postdated or non-postdated, and it covers only the expenses of the service [Sechar Tircha], it is valid, and is not considered Ribis.
May one write a postdated check for himself and exchange it by a Jewish owned check-cashing service for less money?
One may only do so if there is a fixed fee or percentage rate being taken for the check [as Sechar Tircha] and this rate would be the same even if the check was not postdated. If however the check cashing services charges a greater fee or percentage for the postdated check, it is forbidden to exchange it by them due to Ribis.
 The reason: As the laws of interest do not apply to transactions between gentiles and a Jew. [See Admur Ribis 70 and 75]
 The reason: As the laws of interest do not apply to transactions between gentiles and a Jew. [Admur Ribis 75]
 Admur ibid
The reason: This is similar to the collection of an actual debt from the gentile in which the surcharge collection is interest, and hence fulfills the positive Biblical command to take interest from a gentile.
 See Mishpitei Ribis p. 342
 Bris Pinchas 17/11-16
 Bris Pinchas 17/16
 Bris Pinchas 17/16
 Bris Pinchas 17/11