Principles are one thing, commercial reality is another...
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It depends on how the matter progresses. Often debtors will pay once they receive the demand. Court proceedings are usually required for those that don’t. Once you obtain a judgment, if the debtor does not have the means to pay you, you may need to accept payment by instalments. You are ordinarily entitled to charge interest on your debt in accordance with your trading terms or once you have a court judgment.