The expenses and fees involved in buying a Spanish property with a mortgage are usually about 11.5% (not including your own solicitors fees if you choose to use one - which can be from about 800 euros upwards). However, in 2010 the bank are waiving the 1.5% opening fee, so your expenses will be approx 10%. For a purchase with a 90% mortgage, you will therefore need 20% of the purchase price to complete the sale, plus your own solicitors fees if applicable.
For example, if the purchase price is 100,000 euros, then you will need at least 20,000 euros in order to complete.
If the purchase price is 200,000 euros, then you will need at least 40,000 euros in order to complete.
Don´t forget that we may be able to negotiate a discount on the listed purchase price for you!