On 13 March 2008, the Portuguese tax authorities issued notice (oficio circulado) No. 20129, stating that 48 double taxation treaties (DTTs) concluded by Portugal are currently in force, as follows:
| Treaty partner | Legal reference | Date of entry into force | Dividends rate (%) | Interest rate (%) | Royalties rate (%) |
| Algeria | Parliament Resolution (PR) 22/06 of 2… |
