If you are using a cuenta corriente there is no way to avoid the tax. It applies to all debits and credits made in a cuenta corriente (put in a very simple way, the law is actually quite complicated and several other transactions are also subject to the tax, like electronic transfers, etc). However, cajas de ahorro (savings accounts) are exempt from the tax, so depending on what your needs are, if you use a caja de ahorro you can avoid the tax.