MPF are taxable if you withdraw them after you entered Canada and considered a resident for tax purposes
https://taxpage.com/articles-and-tips/transferring-foreign-pension-to-rrsp-a-canadian-tax-lawyer-analysis/
The Requirements for Claiming the Foreign-Pension Tax Rollover under Paragraph 60(j)
The Requirements for Claiming the Foreign-Pension Tax Rollover under Paragraph 60(j)
To qualify for the RRSP tax rollover under paragraph 60(j), a taxpayer must meet six requirements:
First, the foreign-pension benefit must constitute “a superannuation or pension benefit payable out of or under a pension plan that is not a registered pension plan.” A superannuation or pension benefit “includes any amount received out of or under a superannuation or pension fund or plan,” and it “includes any payment made to a beneficiary under the fund or plan […] in accordance with the terms of the fund or plan [or] resulting from the termination of the fund or plan” (see the definition of “superannuation or pension benefit” in subsection 248(1) of the Income Tax Act). According to the CRA, a foreign pension plan constitutes a “superannuation or pension fund” only if (a) the plan requires contributions from an employer or former employer (i.e., the contributions do not come solely from the employee) and (b) those contributions serve to provide an employee with an annuity or other periodic payment on or after retirement (see: CRA Technical Interpretation 2012-0468271E5, “UK Pension Transfer to Canada, March 12, 2013. CRA Interpretation Bulletin 2000-0019865, “United Kingdom Pension, transfer to registered retirement savings plan,” July 6, 2000.). In addition, the pension benefit must come from a plan that “is not a registered pension plan.” A “registered pension plan” refers to a pension plan that has been registered in Canada under section 147.1 of the Income Tax Act.
The second requirement under paragraph 60(j) is that the foreign-pension benefit cannot be “part of a series of periodic payments”—i.e., it must be a lump-sum payment. A pension benefit will satisfy the lump-sum-payment requirement to the extent that it represents a settlement of future entitlements under the foreign plan. But if a portion of the lump-sum payment doesn’t represent a settlement of future entitlements—a payment for periodic pension in arrears, for instance—that portion is not deductible under paragraph 60(j) (see: CRA Technical Interpretation 2012-0468271E5, “UK Pension Transfer to Canada, March 12, 2013.).
The third requirement is that the foreign-pension benefit must be “attributable to services rendered by the taxpayer [or by the taxpayer’s spouse, common-law partner, former spouse, or former common-law partner] in a period throughout which that person was not resident in Canada.” Three rules bear on an individual’s status as a tax resident in Canada. First, an individual may be a Canadian tax resident under common law. Second, even if the individual is not a common-law resident, the individual may be deemed to be a Canadian tax resident under paragraph 250(1)(a) of Canada’s Income Tax Act. Third, an individual may be deemed a non-resident in Canada under subsection 250(5) of the Income Tax Act. Tax residence is distinct from residence for immigration purposes: