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How are the interest rate and monthly payments calculated?
We use the same method used by other financial institutions to calculate the fixed periodic payments.
The periodic payments are determined so that, for a given interest rate, the future periodic payments are equivalent to receiving back the investment today. Goparity uses the 30/360 day-count method, which considers a 30-days month and a 360-days year.
To determine your periodic payment, we use the following formula:
Where:
P = periodic payment
I = amount invested stipulated on the mutual agreement at the time of issuance
r = periodic interest rate, i.e., 
Nominal interest rate = project’s interest rate
n = total number of payments that include interest and reimbursement of the amount owed
Please note this formula only works if the periodic payment includes interest and part of the reimbursement of the amount owed.
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4º Esq
1070-289 Lisboa
Portugal
© 2025 Goparity
GOPARITY (www.goparity.com) is a platform of crowdfunding by loans (crowdlending) managed and owned by Power Parity, SA, a public limited company, with number 514373822, and registered office at Rua Filipe Folque, 2, 1st floor, 1050-110 Lisbon (Portugal), licensed by the regulatory and supervisory body CMVM (Portuguese Securities Market Commission), under Regulation (EU) 2020/1503 (European Crowdfunding Regulation).
The payment services available through the platform are provided by MangoPay SA, a registered electronic money institution based in Luxembourg and supervised by the CSFF (Commission de Surveillance du Secteur Financier), registered with Banco Portugal (the Portuguese regulator) under no. 7830.
Investments in crowdlending carry a risk of a partial or total loss of the funds invested. The return on your investment depends on the project's success developed through the campaign in which you invest. Your investment is not covered by the deposit guarantee schemes established by Directive 2014/49/EU nor by the investor compensation schemes established by Directive 97/9/EU. Please consider all risks before investing and carefully read the Key Investment Information Sheet (KIIS) provided to you before investing.