Voluntary Swiss old Age Pensuion and Canadian Clawback -

QUESTION: Hello Mr. Ingram,

We are Swiss/Canadian citizens living since 15 years in Canada.
When we immigrated, we opted to keep paying the expensive voluntary social security to Switzerland in case of a return.
We were told these payments can't be deducted from income taxes in Canada.
Now we worry that possibly due to our Swiss social security pension after 65 of about $15000 each, our OAS and CPP entitlements could be reduced. If so, how can we prevent this?

thanks for your advise
Best regards
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Article 18

Pensions and Annuities

1. Pensions and annuities arising in a Contracting State (SWITZERLAND) and paid to a resident of the other Contracting State (CANADA) may be taxed in the State (SWITZERLAND) in which they arise, and according to the law of that State. However, in the case of periodic pension or annuity payments (except lump-sum payments arising on the surrender, cancellation, redemption, sale or other alienation of an annuity, and payments of any kind under an annuity contract the cost of which was deductible, in whole or in part, in computing the income of any person who acquired the contract), the tax so charged shall not exceed 15 per cent of the gross amount of the payment. For the purposes of this Article, the term "pension" does not include payments under the social security legislation in a Contracting State.

2. Notwithstanding anything in this Convention:

(a) pensions paid by, or out of funds created by, Switzerland or a political subdivision or a local authority thereof to any individual in respect of services rendered to Switzerland or subdivision or local authority thereof in the discharge of functions of a governmental nature shall be taxable only in Switzerland; 

(b) war pensions and allowances (including pensions and allowances paid to war veterans or paid as a consequence of war) arising in Canada and paid to a resident of Switzerland shall be excluded from the bases used for the computation of Swiss tax, to the extent they would be exempt from Canadian tax if received by a resident of Canada; 

(c) pensions and allowances received from Switzerland under the legislation concerning Military Insurance shall be exempt from Canadian tax so long as they are exempt from Swiss tax; 

(d) alimony and other similar payments arising in a Contracting State and paid to a resident of the other Contracting State who is subject to tax therein in respect thereof, shall be taxable only in that other State.