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You need an actuary (preferably), or a TPA that then outsources/contracts with an actuary (clunkier). This firm would provide required plan document and required annual actuarial valuations. There would also be an annual government filing that they would do but depending on the circumstances might be very simple such that you could also do yourself. You would be trustee, so wherever you went to custody the assets wouldn't matter much, so choosing the least expensive reputable financial firm makes sense. Going to such a firm for everything, in my opinion, would be a mistake Note that as an S-corp, only your W-2 pay counts as wages for pension purposes, so lowballing your pay to avoid FICA and Medicare taxes also lowers your potential pension. If you have employees there are lots more rules to follow (hence, go to a qualified actuary or TPA who does a LOT of these plans). If you are the only employee it's a little simpler, but if you already have another plan like a profit sharing 401(k) or a SEP then you have some deduction rules to navigate and issues if using SEP -5305 document.