Pension income on the income summary includes amounts from lines 113, 114, 115, and 116 of your return.

This would include:

• Old Age Security Pension (T4A(OAS))
• Canada Pension Plan benefits (T4A(P))
• Other pensions or superannuation (Box 16 or 24 from T4A, Box 16 or 20 from T4RIF, box 19 of T5, box 31 of T3 - some of these depend on your age and reason the amount is received)
• Elected split-pension amount, if your spouse is transferring some of their pension to you via pension splitting

You can check lines 113-116 by going to Review > Bottom Line (Tax Summaries), then clicking the Detailed Tax Summary link.