Net Rental has to meet or exceed the Mortgage Payment, normally at a Stress Rate, by a certain percentage. This could be tested monthly, quarterly or annually. For example; if we assume the Stress Rate is 6.5%, and the Rental Covenant is 125%, and the Annual Loan Payment at 6.5% is £ 100,000, then Net Rental would need to meet or exceed £ 125,000 annually.