The 2018 ON Budget included up to $750 a year on household maintenance costs — such as snow-shoveling — for seniors 75 & older. How is this captured in Turbotax

That was the *proposed* budget. The $750 for seniors maintenance cost didn’t make it into the bill that actually passed. https://www.taxtips.ca/ontax/ontario-budget-2018.htm

You can see what tax credits, benefits and government pensions available for seniors in Ontario here: https://www.ontario.ca/page/seniors-manage-your-finances