Most small-business tax problems aren't exotic — they're the same handful of mistakes repeating across hundreds of owners. Catching them early usually saves five figures per year; catching them in year three usually costs five figures to unwind. The list below is the operating essentials, ordered roughly in the order they matter as a business grows.
Pick the right entity — and revisit it every year or two
Entity choice determines how profits are taxed, what the owner pays in self-employment tax, whether payroll is required, and what liability shield is in place. Most owners choose once and never revisit. That's a mistake: the optimal entity often shifts as revenue, headcount, and profit margin change.
| Form | Federal tax on profits | Owner payroll? | When it makes sense |
|---|---|---|---|
| Sole proprietorship | On owner's individual return | No | Very early stage; side income; pre-revenue. |
| Single-member LLC (default) | Same as sole prop | No | Same as sole prop but with state liability shield. |
| S-corporation election | Pass-through to owners | Yes — owners paid a reasonable salary | Profitable owner operation; $30–60k+ typical savings vs. sole prop. |
| Partnership / multi-member LLC | Pass-through to partners | Only for non-owner employees | Multiple founders with flexible profit allocation. |
| C-corporation | 21% flat corporate rate | Yes for working owners | Plans for outside capital; planned exit for capital-gains treatment. |
Reasonable compensation
S-corp owner-employees must take a 'reasonable salary' for services rendered. The IRS benchmarks salary against role, hours, prior compensation, and industry data. Too low a salary — and the savings on distributions can be disallowed in audit; too high a salary — and you've given up the S-corp's structural advantage.
Quarterly estimates — and why missing them is expensive
Federal, NC, and GA all expect quarterly payments from anyone with non-wage income. Safe-harbor rule of thumb: pay 100% of last year's total tax liability (110% if last year's AGI exceeded $150,000) to avoid underpayment penalties even if this year is larger. Deadlines:
| Quarter | Period covered | Estimated-tax due |
|---|---|---|
| Q1 | January 1 – March 31 | April 15 |
| Q2 | April 1 – May 31 | June 15 |
| Q3 | June 1 – August 31 | September 15 |
| Q4 | September 1 – December 31 | January 15 (next year) |
Most owners underwithhold because they wait until the year-end will-force and then make a single large Q4 payment. Penalties accrue daily. The right rhythm is a small monthly accrual in the business checking account and a quarterly true-up.
Owner payroll mechanics (S-corp focus)
Running payroll on yourself is the most underused tax-saving opportunity available to profitable small businesses. The mechanics are not complicated but must be done consistently: set up the payroll service the day the S-corp election becomes effective; pay yourself a defensible salary on a regular cycle; file the appropriate federal and state payroll forms quarterly (Form 941 in most states); reconcile and remit payroll taxes by their deadlines; and document your reasonable-compensation review annually.
1099-NEC and contractor reporting
Issue Form 1099-NEC to any non-corporate contractor you paid $600 or more for services in a calendar year. Required by January 31 of the next year. Penalties for late or missing 1099s start at $60 per form and scale up. The penalty structure for missing or incorrect TINs is steeper than for late issuance, so always confirm contractor TINs well before payment. Note: payments via credit card, PayPal, or other third-party settlement organizations are reported on Form 1099-K by the processor — but that does not eliminate your 1099-NEC obligation.
Common deductions and how to claim them cleanly
- Home office: exclusive and regular use, formula = (office sq ft / total sq ft) × indirect expenses. Recapture on sale of home is possible (Section 121 exclusion may be reduced).
- Vehicle: standard mileage (67 cents/mile 2024) or actual expenses. Always keep a contemporaneous log; round-trip commutes don't count.
- Section 179: front-load equipment, software, qualifying vehicle costs. 2024 limit $1,160,000 with phase-out above $2,890,000 of qualifying purchases.
- Bonus depreciation: 60% in 2024, 40% in 2025, 20% in 2026, 0% in 2027 absent legislation. Good for large purchases with long depreciable lives.
- QBI deduction (Section 199A): up to 20% — but phaseouts and W-2 wage / UBIA tests apply. Plan headcount carefully.
- Self-employed health insurance: deducted above the line; do not include in medical itemized deductions.
- Self-employed retirement plans (SEP, Solo 401(k), Cash Balance): can shelter tens of thousands of dollars per owner.
- Start-up costs: $5,000 deductible in year of launch (phased out above $50,000), balance amortized over 180 months.
Sales tax and economic nexus
If your business sells taxable goods or services and you have nexus in a state (physical presence, employees, inventory, or in many states economic-nexus thresholds), you're required to register, file, and remit sales tax. Both NC and GA have economic-nexus thresholds based on number of transactions or dollar volume of sales into the state. Multi-state retailers must register in each state where thresholds are met. Marketplace-facilitator laws (Amazon, eBay, Etsy, etc.) shift collection to the marketplace for many sellers but do not eliminate filing obligations.
When to actually talk to a tax advisor
- Year one of any new business: at least one conversation to set up entity, payroll, and bookkeeping correctly.
- Every year your profitability crosses $50k, $150k, $250k, or $500k: revisit entity choice.
- Before any major asset purchase (>$25k equipment, real estate, vehicles).
- Before hiring your first employee (or first office-based contractor).
- Before any planned sale, partial sale, or outside-investor round.
- Before any change in state-nexus footprint.
I formed an LLC and never elected S-corp status. Can I elect this year?+
Yes — but the election is generally effective for the next tax year. Late-election relief exists if you act within a window; otherwise there's a lost-year cost of paying self-employment tax on what would have been distributions. Plain-Form-2553 elections are usually straightforward; partnership-with-corporation elections are more complex and worth a quick consultation.
Can I take the home office deduction if I do most of my work at the office?+
No. The home office deduction requires exclusive and regular use of a portion of the home for business. A laptop on a kitchen table doesn't qualify. A dedicated room that gets regular business use does — provided it isn't a personal guest room or dual-use space.
I took the standard mileage rate in year one and actual expenses in year two. Is that allowed?+
Yes, but only if you switch at the beginning of a year. Once you use actual expenses for a vehicle, you can't switch to standard mileage on that vehicle in a later year without recapture rules. Decide the method at the start.
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