The agreement is the standard for the effective exchange of information within the meaning of the OECD`s initiative on harmful tax practices. This agreement, published in April 2002, is not a binding instrument, but includes two models of bilateral agreements. A number of bilateral agreements were based on this agreement.  A claim for reimbursement must be made to the national tax administration of the place of residence of the deduction. One of the most important aspects of a tax treaty is the withholding policy of the treaty, since it determines the amount of taxes collected on income (interest and dividends) on a non-resident`s securities. For example, if a tax agreement between country A and country B establishes that their bilateral withholding tax on dividends is 10%, Country A will tax dividends paid in Country B at a rate of 10%. and vice versa. As a withholding agent, you should consult the actual provisions of the tax treaty that apply to the person you must pay to if you have reason to question the documents you have received. Many countries have tax treaties with other countries (also known as double taxation agreements or DBAs) to avoid or mitigate double taxation.
Such contracts may include a number of taxes, including income taxes, inheritance tax, VAT or other taxes.  In addition to bilateral treaties, multilateral treaties also exist. For example, European Union (EU) countries are parties to a multilateral agreement on VAT under the auspices of the EU, while a joint mutual assistance treaty between the Council of Europe and the Organisation for Economic Co-operation and Development (OECD) is open to all countries. Tax treaties tend to reduce taxes in one contracting country for residents of the other contracting country in order to reduce double taxation of the same income. The federal Department of Finance strives to make available the necessary forms so that the taxpayer can be exempt from withholding tax, in accordance with the respective TDTs and the DTT. This additional service, however, depends on the fact that the foreign tax authorities themselves make their forms available to the Austrian Federal Ministry of Finance. All available forms can be downloaded. Amounts that are subject to the chapter 3 withholding tax (usually fixed and determinable income, annual or periodic income) may be exempt from tax under a contract or reduced rate. There are no separate forms for contractual relief at source and the repayment of the Turkish withholding tax.
The refund of the Turkish withholding tax must be questioned by the relevant tax office. Form mod. 21 (PDF, 264 KB) – RFI (right to a full or partial exemption from Portuguese withholding tax) Iceland has several tax agreements with other countries.