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1. Dear Customer, there is no such thing as a Minimum earnings test or Primary earnings test to gain a Permanent Residence card if you are an EU NATIONAL, such as a German citizen. You don't need to show proof of your earnings in order to apply. A Permanent Residence card must be held for one year to prove you have been "visa free" for a period of one year before you apply for UK citizenship. HOwever, there is no separate test to get the Permanent Residence card. It merely evidences your status. Additionally, there is no minimum earnings test if you are applying for UK citizenship. EU nationals do not have a minimum earnings test applied to them in either instance. So, you are worrying unduly.
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