@5ftb, I'm the retiree who is paying $58 in monthly premiums through Obamacare for me and my spouse. You are correct in that my annual household income is low. Although I chose to take my pension as a lump sum, I only draw $2,250/month ($27,000 annually). I was laid off in mid 2015 and received subsidized COBRA medical through Dec 31, 2015. So for me, it worked out conveniently. I applied for Obamacare in Nov 2015 and started my new medical plan on Jan 1, 2016. When asked on the Healthcare Marketplace application for my estimated 2016 taxable household income, I reported $27,500 to account for my 401k monthly distributions, plus anticipated bank interest. You should be aware that I can get by with $2,250/month just fine, as I paid off my home two years ago and I don't have any debts. That amount covers all my monthly expenses with not much room for extras. I haven't had to cut back on my lifestyle either. I anticipated the $2,250 amount by having tracked all my expenses for the last 3 years and grouping everything into expense categories, then averaging everything. In months where my utility bills tend to be lower than average, I keep the money in savings for the months it will be needed. For annual bills like insurance and taxes, I set aside the prorated monthly amount into savings as well. For flexibility and any emergency expenses, my wife and I maintain local bank and credit union balances that total around $135,000. We try to not touch it, but it's there if we need it.
So, that's how I manage to pay a low premium (Silver level) HMO policy through Obamacare for $58/month. We plan to maintain this plan for another 5 years until I reach 65 and can get a Medicare 65 Advantage medical policy through the Chevron Medical Plan that will keep our premiums low. If I decide to take early Social Security at 62, I'll cut back my 401k distributions by the amount of my SS benefits to keep my medical policy premiums low and max out the government subsidies. Of course, if Obamacare is repealed or revised, then I'll see what I need to do. Either way, I have a plan.