Generally, partnerships do not have to file a partnership information return (PIR) if they have five partners or less throughout the whole fiscal period; and no partner who is another partnership.
If you are a partner of a partnership that does not have to file a PIR, calculate the partnership's income and expenses using the same rules you would use for reporting your business and income expenses for a proprietorship.
Some rules for capital cost allowance and eligible capital expenditures on partnership-owned property are different.