We’ve been downshifting for several years now, but since we’ve now hit 60, we want to take a distribution from a SEP-IRA up to the ACA subsidy limit. Still will have some self-employment income. However, it’s a strange tax year with some unusual circumstances that will make it hard to estimate exact Adjusted Gross Income ahead of time. Suppose I blow it and take out too much distribution in December? But it’s not til February, at tax time, that I figure that we’re past the ACA limit by say $500. At that time, can I make a 2018 contribution of $500 to get back under the limit and save the subsidies?