You are personally liable for mistakes. That sentence is worth reading twice. As estate trustee, if you distribute assets before obtaining a clearance certificate from the CRA, the unpaid taxes come out of your pocket. If you pay one creditor ahead of another in an insolvent estate, the shortfall is yours. If you miss the 180-day deadline to file the Estate Information Return with the Ministry of Finance, fines start at $1,000 and there is no limitation on future audits.
These are not edge cases. They are the ordinary consequences of administering an estate without someone watching the deadlines, the tax filings, and the order of payments. Executors hire lawyers because the personal stakes are high and the early decisions are the ones that cannot be undone.