Pension Splitting generally only affects the income tax returns of both spouses at the time of filing, but other programs based on individual income levels outside of the tax return could be affected depending on your situation. Here's some more information regarding Pension Splitting.
https://turbotax.intuit.ca/tips/pension-income-splitting-how-it-works-advantages-and-conditions-5545
https://turbotax.community.intuit.ca/replies/2647668
