The central issue in this transaction is whether it constitutes a loan (qarḍ) with an increase, or a valid sale-based or partnership-based financing structure. In Islamic law, the ruling depends not on the label used but on the substance of the contract.

If the arrangement is truly a loan of money — meaning you are given $5,000, and you are obligated to repay $5,800 regardless of outcome — then this falls under the principle that any guaranteed increase on a loan is ribā. The Prophet ﷺ said: “Every loan that brings a benefit is ribā.” (Reported by al-Ḥārith ibn Abī Usāmah and others; accepted in meaning by the jurists). The jurists are unanimous that if a lender gives money and stipulates repayment of a higher fixed amount, that increase is prohibited, even if it is labeled a “service fee,” so long as it is tied to the loan itself and not to a separate, real service.

In your case, the amount of $800 is predetermined and directly proportional to the loan amount. The total of $5,800 is fixed from the beginning, and you are obligated to repay it regardless of how your business performs. The fact that repayment is taken as 25% of sales does not change the ruling if the total repayment is guaranteed. Structurally, this resembles a loan with a fixed increase, which is ribā, even if no APR is mentioned and no late fees are charged. Removing the word “interest” does not change the legal substance.

However, some modern financial products attempt to structure such arrangements as a “merchant cash advance” where repayment is tied to sales performance. If the repayment amount were genuinely uncertain and fluctuated with profit — meaning the financier truly shared risk and could receive less if sales declined — then it might resemble a partnership (muḍārabah) or a sale of receivables. But in your description, the $5,800 is fixed and guaranteed, and the company bears no real business risk. This makes it closer to a loan with an increase than to a profit-sharing partnership.

Allah says: “Allah has permitted trade and forbidden ribā.” (2:275). The distinction between trade and ribā lies in risk-sharing versus guaranteed return. When capital is guaranteed, and profit is fixed in advance without risk, it resembles ribā rather than trade.

Therefore, based on the information provided, the stronger opinion is that this arrangement is not permissible because it constitutes a loan of $5,000 with a guaranteed repayment of $5,800. The method of deduction and the absence of APR terminology do not change the substance of the contract.

If you are in need of capital, permissible alternatives would include seeking an interest-free loan (qarḍ ḥasan), entering into a genuine partnership where profit is shared and not fixed in advance, or using Shariah-compliant financing structures that involve actual sale or asset-based transactions rather than cash-for-cash increase.

If there are additional contractual clauses that materially change the structure — such as true risk-sharing where repayment is not guaranteed — those details would need careful review. But as described, the arrangement resembles ribā and should be avoided.