Paying Back Advanced Tax Credits (Subsidies)

In the chart, it showed if your income is less than 200% fpl (one in household) you would need to pay back up to 300 dollars in advanced tax credits. Do you think this is close to 100% accurate and was it based on information in the obamacare act itself. I am keeping all your contact info. in my ins. folder for future use, when needing to find a quality affordable plan. I am self employed currently on my farm (ag industry is a high expense industry as a whole) and have a catastrophic only coverage plan (6000 + deductible).