My employer hired me on part-time contract and will not give T4 for my income. How should I report it?

My employer hired me on parttime contract and asked me to pay my taxes myself. 

They won't provide me T4. 

Every month I send invoice for amount (A hours x hourly rate) and receive payment by cheque. 

My question is if I just mention it as other income/occasional income in turbo tax will it be okay. 

That section in turbo tax do not have field for entering my company name. Sometimes I heard i can report it as T2215 showing it as my business expense. What would be the most appropriate option to report my income in turbotax? I work in ontario.