The answer
There is no universal percentage. Build separate amounts for immediate work, vacancy and turnover, routine repairs, insurance deductibles, and known capital items such as roof, heating, hot-water, exterior, drainage, appliances, or condo obligations. The reserve should follow the property's actual condition, systems, tenancy, and financing risk.
Calgary-specific context
A newer condo with deductible and assessment exposure, a 1970s suited bungalow, and a fourplex with shared systems require different reserve plans even at the same purchase price.
What to do next
Price the inspection and document findings into a dated reserve schedule before using all available cash for the down payment.
Verify before relying
Official sources for this topic
These sources explain the rules and records relevant to this topic. Check the current requirements for your property.
Check the current information at the linked source. Ask the appropriate professional how it applies to your property.
Important
Real estate rules, market conditions, property records, taxes, financing terms, bylaws, and physical conditions can change. Verify time-sensitive and property-specific facts with current official sources and the appropriate qualified professional before acting.
RELATED GUIDES / Suites & fourplexes
Check rental income and whether the use is permitted.
Separate advertised rent from signed leases and lawful use. Verify suite records, occupancy, insurance, financing, expenses and tenancy obligations; test a vacancy and repair scenario before relying on projected cash flow.
Affiliated network resources provide context. Confirm rules, approvals and property records with the responsible authority.