Another allocation/contribution/deduction question

This is sort of a follow up question to a recent post on funding deadlines.

- Client has a calendar year 401(k) plan with a SH match, no profit sharing contribution in recent years.

- Client initially wanted to do SH only for 2017.  2017 corporate return was filed with the deduction for the SH match.  

- Client now wants to reconsider the profit sharing allocation for 2017, but the CPA has some concerns since they already finalized the 2017 return and would need to make the deposit today in order to deduct it for 2017.

I'm considering the available options and the first that comes to mind is to make the contribution sometime between now and 10/15, which would let me allocate and count the PS for the 2017 annual additions but take the deduction in 2018.  If I do that and max my principals out at their 2017 annual additions, I can still max them out for their 2018 annual additions and deduct both in 2018 as long as the total contribution deducted in 2018 (2017 PS and 2018 annual additions) does not exceed 25% of 2018 covered comp right?

Right. I'd not deposit anything today.  Instead, I'd wait for tomorrow, at the earliest.

Perfect.  Thanks Mike

I had IRS tell me had to deduct in prior so agree with Mike.  What a waste of time that conversation was.