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The T2 section for SBD and the AT1 Schedule 1 will both auto-populate if the corporation type is Canadian-controlled private corporation (CCPC) on the Info tab
Schedule 3 is used to report dividends received or paid; have a look at line 450 for example.
TurboTax does not adjust retained earnings from entries made on schedule 3. The balance sheet and income statement must be completed before starting the tax return
Hope this helps
