A Floor Clause, also known as ‘Clausula Suelo’ or ‘Suelo Hipotecario’, is simply a clause that has been inserted into variable rate mortgage agreements in Spain during the last 20 years that affects the interest rate payable on the mortgage.For most Spanish variables rate mortgages, the interest rate payable is calculated by reference rate to Euro Interbank Offered Rate (Euribor) . If interest reference increases, then the interest on the mortgage also increases, likewise, if EURIBOR decreases, then interest payments will fall.