International pension options for US senior citizens

There are a number of international pension options available for US senior citizens. Tax-deferred savings and investment structures are widespread throughout the world. Governments want to encourage people to accumulate private resources to meet their retirement needs rather than solely relying on state-run pension schemes.
Among the foreign pension programmes that Americans who are overseas frequently meet are:
System of Swiss Pillar Pensions
Registered Retirement Savings Plans (RRSPs) in Canada
Hong Kong's Occupational Retirement Schemes Ordinance (ORSO) and Mandatory Provident Fund (MPF)
The Central Provident Fund (CPF) of Singapore
Superannuation in Australia
Caisses de Retraite in French
Employer-Sponsored Pension Schemes and Self-Invested Personal Pensions (SIPPs) in the United Kingdom
Regrettably, contemporary pension plans and the rise of a mobile workforce were both established long before the U.S. system of citizen-based taxes was created. However, certain U.S. income tax treaties permit overseas pension plans to be regarded as eligible for U.S. taxation. The tax agreement between the U.S. and the UK is one such example. 
The United States and the United Kingdom have a tax treaty that covers all aspects of pensions, including laws regarding contributions, earnings, and payments, in contrast to many other tax treaties the United States has with other nations.
For U.S. tax reasons, an American living in London, for instance, may deduct payments made to their UK pension plan. Such specialized tax treaty provisions are uncommon outside of the United Kingdom, and the majority of overseas pension schemes are not subject to preferential tax treatment. For instance, the United States and several popular expat locations including France, the Netherlands, Hong Kong, and Singapore lack tax treaties controlling pension contributions. 
American expats who participate in foreign pension systems often cannot deduct their contributions from their U.S. gross income in the absence of a comprehensive tax treaty and must take additional steps to appropriately record their pension assets.
Utilizing foreign pensions as part of a comprehensive retirement plan
The lack of tax-qualified status and treaty protection for overseas pension plans should not automatically deter people from considering participation in such plans. In order to maintain compliance with U.S. tax rules and to ensure that investments made within pension plans receive the most advantageous tax treatment, a number of tactics can be used. It is essential to ensure uniformity in the tax treatment throughout different filing years, regardless of the reporting method selected. Different reporting techniques used from year to year run the possibility of double taxation.