Last min. tax savings/deferment?

Last min. tax savings/deferment?
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Got an extension but have about $3K in sole. prop . business profit for 2018 that I’d like to defer/save taxes on/avoid underpayment penalties.

I going to contribute a prior year solo 401k contribiution (profit sharing since I already maxed out 18.5K for 401k at w2 job) Any other prior year suggestions :slight_smile: including overlooked deductions.?

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Is there a limit to profit sharing?