Not paying your bills at all is the absolute worst thing you can do for your credit score.
When you fail to make payments the credit provider classifies it as a default. This will appear on your credit report and it will remain there for the following five years.
Defaulting on your payments will not be taken lightly by credit providers and it could lead to your credit applications being rejected in the future.
Make Payments On Time - Every Time
Therefore, it is absolutely essential that you make your payments by the date they are due. Failing to do so is the absolute worst thing you can do to your credit score.