Cancellation of debt a key element of most restructurings generally triggers taxable income. The German tax authorities had issued an administrative decree (the "Tax Restructuring Decree" - Sanierungserlass), however, declaring that, upon the satisfaction of certain requirements and conditioned on forfeiture of any loss carry forwards, the cancellation of debt income ("CODI") would not be taxed.

1. Can I lock the tenant out of the property until they pay?

No. If a tenant has been placed in administration then there will be a moratorium in place. This gives a company some breathing space. Rights against the company, such as forfeiture or conducting legal proceedings, can only be pursued with either the consent of the administrator or a court order. As noted last week, changing the locks is likely to forfeit the lease. Unless you intend to forfeit and obtain the necessary permission to do so, you should not change the locks.