Solved
Since we ended up owing $3700 I'd much rather put that $$ in our Sep Ira and lessen our tax bill...
Yes, if by April 18, 2017 you make a contribution to a SEP-IRA for the 2016 tax year, you can amend your 2016 tax return to include it. An IRA contribution is (potentially) a deduction, not a tax credit, so the amount that it reduces your tax bill will be determine by your marginal tax rate on that amount of income. If your marginal tax rate is 25%, you would have to make a SEP contribution of $14,800 to eliminate your tax bill. A SEP contribution of $14,800 would require a net profit from self-employment of something like $79,625.
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