Spain-property.com 
Medlem af  FIABCI, int. Real Estate Federation
Always seek professional advice.
The following information is only supplied as a general guide. In Spain, as in any Country, always seek professional advice before entering into any contract.
Costs in general
Buying a property in Spain involves a large amount of paperwork, with this comes a number of costs. As a guide line you should add 10% to the declared purchase price of the property to cover this. Costs are as follows:
Transfer Tax
This is the one which will hit your pocket the hardest, 6% is payable on a resale property, 7% IVA (VAT) and 1-1/2% Stamp Duty is payable on a new property and 16% is payable on the purchase of land. If you buy a new property and intend to have a pool or garage built, try and have it included with the sale of the property, as if you build later, you will attract tax at the higher rate of 16%
Notary Charges
These are set on a fixed scale by law and you should expect to pay around 50,000 pesetas as a minimum. this can rise quite dramatically if other factors are included, as loan and mortgage.
Solicitors Fees
Probably the best investment you will make, buying without a Solicitors advice could cost you dearly. Expect to pay around 100,000 pesetas on a property purchase of between 10 - 20 million pesetas
Registration
Having a property deeds inscribed in to your name at the Registrar. Expect to pay between 20,000 and 50,000 pesetas
Who Pays What
Spanish Laws state that unless stipulated in the Contract, Taxes and fees are split between the buyer and seller as follows:

Buyer Pays

  • The transfer tax or IVA

  • Registration fees

  • Notary Costs

Seller Pays

  • Plus Valia tax, which is calculated on the increase in value of the land since the last sale

  • Notary fees in drawing up the new deeds

  • The estate agents fees

These rules are not followed rigidly and it is often the buyer who ends up footing the bill for most of them, In Spain, all debts on a property, stay with the property when it is sold, another good reason to employ a solicitor to discover if any nasties are hidden away with a property.
More informations
The paperwork in Spain is a complex thing and only the people who write the laws and Solicitors have a true understanding. Therefore always take contact to a lawyer and and a notary office before you sign any documents.