The choice among sole proprietorship, partnership, S corporation, and C corporation determines how every dollar of profit is taxed. The right answer changes as the business grows — a structure that was optimal at startup is frequently costing money five years later. Reviewing it periodically, rather than never, is the single highest-leverage planning habit.
For S corporation owners, the split between salary and distributions directly affects payroll tax. Set it too low and you invite IRS scrutiny; too high and you overpay every single year. The defensible middle requires documentation of what comparable roles pay — a one-time analysis with recurring annual savings.
Accelerating deductible expenses into a high-income year, deferring income where legitimate, and timing equipment purchases around depreciation elections are all decisions that must be made before year-end. This is exactly the planning that dies when your accountant only appears in the spring.
Many states offer pass-through entity taxes that let business owners deduct state taxes at the entity level — a legitimate workaround to federal deduction limits that can be worth five figures annually for profitable firms. These elections often have deadlines and must be actively made; silence forfeits them.
Solo 401(k)s, SEP IRAs, and defined benefit plans let profitable owners shelter substantial income while building personal wealth. The right vehicle depends on age, income, and employee count — and the contribution deadlines reward those who plan early.
Effective planning is a quarterly conversation, not an annual filing: review year-to-date numbers, project the full year, act while acting is still possible. If your current arrangement doesn't include that rhythm, you are preparing taxes — not planning them.
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