There are a number of reasons why a business bank account might be frozen. It could be due to a request from HMRC for instance, or if the business is being investigated for fraud. In some cases, a bank may freeze a account if it suspects that the account holder is engaging in money laundering. Whatever the reason, a frozen bank account can be a serious setback for a business, preventing it from being able to access its own funds. In some cases, a business may be able to negotiate with the bank in order to have the account unfrozen, but it is not always possible to reach an agreement. As such, it is important for businesses to be aware of the risks associated with having a bank account.