Solo 401(k)s allow employee deferrals plus employer profit sharing, enabling higher totals at modest income levels and Roth options in some plans. SEPs offer simplicity but lack employee deferrals. Consider deadlines, custodial fees, and paperwork, then automate contributions so saving becomes default rather than an exhausting, end‑of‑year scramble.
Deduct self‑employed health insurance premiums when eligible, and if enrolled in a qualifying high‑deductible plan, funnel pre‑tax dollars into an HSA. Treat it like a stealth retirement vehicle by paying cash now and reimbursing later. Keep EOBs, receipts, and a tracking sheet to preserve audit‑proof flexibility.
If you elect S corporation treatment, payroll enables larger, earlier Solo 401(k) contributions through deferrals. Set a documented, reasonable salary, then automate deposits to the plan each pay period. This regular cadence smooths cash flow, boosts discipline, and better captures seasonal spikes compared with procrastinated, lump‑sum transfers.