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Is 0% credit card utilization worse than 1-20% credit card utilization for any reason other than pure statistics?
Credit Scores / Rates are based on sometimes simple and sometimes quite complex Statistical Models (Generalised Linear Models, Neural Networks, Regression and Classification Trees, Mixture Models, etc).This depends on whether it is something more general like FICO or what large banks develop in-house. In any case, there are many legislation-dependent factors (Qualitative such as education, occupation security, sex, etc, payment history; or Quantitative such as age, liquidity and leverage ratios, etc).  Now, most model that are used today are propriety and closely held trade secrets. The most important reason for this is actually because of the databases that feed the models. More better quality data is what makes the real difference ... although at the cutting-edge, the mathematicians/statisticians/computer scientists that design the algorithms will make a huge difference.  Now, back to the main thing: The Credit Score/Rate is meant to be used only as an indicator for representing the Probability of Default ("How likely you are to default on your obligation towards me?" is what it means and that is largely based upon "Has company/he/she honoured his financial obligations?") of a certain consumer. In more sophisticated models, they may also use your industry sector or occupational and financial security to predict the future behaviour. However, this "Credit Score" has meaning only in relation to a "Credit Limit" ("Can you pay back my $X?"). The credit limit on the other hand is defined by your income level, debt/asset, etc).   As a credit risk analyst, whether we are dealing with large corporate loans, mortgages, personal loans, etc), the principles are the same: One thing to consider is that factors considered in determining a credit score usually do not have a simple linear relationship.  Consumer Profile types such as utilisation rate are a lot more about EFFECT than CAUSE:   The most important thing is to honour your obligations, whether you pay before or after you spend makes little difference, so long as you pay in full and prior to maturity, your rate/score will improve with time. Financial Institutions have many ways to make money of everyone. Some, such as interest rates and fees are directly charged to you and some are charged to your goods-and-services providers. That has no bearing on your score. Sometimes it even makes sense to take on customers with rock-bottom ratings, lend them lots of money, and charge them to dirt. As you may well know, the recent financial crisis - with ongoing after-shocks and tremors - was the result of such practices.