In Sweden, small and medium enterprises (SME:s) represents a majority of the total employement and number of enterprises. Even though this is the case, there is a challange for these companies to get access to the financial resources they need. For several reasons SME:s do not have the same access to the capital markets as large enterprises; therefore, banks are the the main source of SME funding. First of all, banks need a more efficient way for making decisions regarding SME lending. Second of all, it is essential that managers of SME:s knows the critical parts of their financial statements. Purpose: This thesis purpose is to analyze what factors that best determines the credit risk of a SME and further analyze how trade-credit affect these factors. Method: The study is done by the use of two statistical analysis techniques: principal component analysis and oneway-ANOVA. These two analysis techniques are used in a complementary procedure. The data applied is describing 16 financial variables from totally 939 Swedish SME:s.  Results: In the result we introduce the most crucial financial ratios (regarding probability of default) for an SME and their interrelation to trade credit. This data shows, together with the statistical analysis techniques, that there are five financial ratios that have an additional importance compared to the rest. These five financial ratios also shows some interelation to the credit period.  Conclusion: Three out of the five most important financial ratios showed statistical significance. We can conclude that the trade credit has an affect on at least two of the three financial ratios that showed statistical significance.