Does Protax can link T5 box 17 to T2125?

Hi there, 

Thanks for connecting with us here. I'll be glad to assist by sharing more info so you're on the right track. 

The ability to prepare T2s is available through ProTax in QuickBooks Online Accountant. I encourage you to learn more about this using this link here. For questions regarding T2s, I recommend getting in touch with Protax support team using this link here. They'll have the proper tools and resources to assist  you. In the meantime, feel free to ask other questions. I'm here to help.