The first year of self-employment surprises almost everyone in the same way: you make good money, you set some aside, and the tax bill is still bigger than you planned for.
That's usually not because you did something wrong. It's because self-employment income is taxed differently than the W-2 income most people build their instincts around, and nobody's withholding anything on your behalf.
Here's what actually applies.
Self-employment tax is the part people miss
When you're employed, Social Security and Medicare taxes are split. You pay 7.65% and your employer pays the other 7.65%, which you never see on your pay stub.
When you're self-employed, you're both. That means 15.3% on your net self-employment earnings, on top of ordinary income tax. Once net earnings reach $400 for the year, it applies from the first dollar of profit. There's no standard deduction shielding it the way there is for income tax.
Two things soften it. You get to deduct half of the self-employment tax when calculating your adjusted gross income, and the Social Security portion only applies up to an annual wage base, after which only the Medicare portion continues.
But the planning implication is simple: budgeting for "my tax bracket" alone underestimates the bill. How much of each dollar of profit goes to tax depends on income, deductions, and state, which is why a real projection is more reliable than a rule of thumb.
Quarterly estimated payments aren't optional
Because nobody withholds for you, the IRS expects payments throughout the year. Federal estimated payments are generally due in mid-April, mid-June, mid-September, and mid-January of the following year. Georgia has its own estimated payment schedule as well.
Skip them and you can owe an underpayment penalty even if you pay the full balance by the filing deadline. The penalty is calculated as interest on each quarter's shortfall for the time it was outstanding. It's not catastrophic, but it's avoidable. We go deeper on how the penalty actually gets triggered in why quarterly estimated taxes catch people off guard.
There are safe harbor rules that protect you from the penalty if you pay in at least a certain percentage of either the current year's or the prior year's tax, with the threshold depending on your income level. For volatile income, the prior-year safe harbor has the advantage of being a known number before the year starts.
One practical note: if you also have a W-2 job, or your spouse does, increasing withholding there can substitute for estimated payments. Withholding is treated as paid evenly throughout the year regardless of when it actually happened, which is why a late-year withholding increase can cover a shortfall from earlier quarters.
What Schedule C actually asks for
Schedule C reports your business income and expenses. In structure it's simple: revenue in, expenses out, profit to your 1040. In practice, the quality of the return depends entirely on the quality of your records.
The categories that matter most for most self-employed filers:
Vehicle expenses. You can use the standard mileage rate or actual expenses, but you need contemporaneous records either way, a mileage log, not a January reconstruction. Commuting to a regular workplace doesn't count; travel between work locations does.
Home office. The space must be used regularly and exclusively for business. "Exclusively" is doing real work in that sentence, the dining table doesn't qualify. There's a simplified method based on square footage and a regular method that allocates actual home expenses. The regular method is often larger but requires more substantiation.
Health insurance. If you're self-employed and not eligible for subsidized coverage through your own or a spouse's employer, premiums are generally deductible above the line, up to the business's net profit, which means you get the benefit without itemizing.
Retirement contributions. This is often the largest deduction available to a self-employed filer. A SEP-IRA or solo 401(k) lets you shelter substantially more than a standard IRA, and the solo 401(k) in particular allows both an employee deferral and an employer contribution, which can add up to a very large deduction for a profitable one-person business.
Equipment and assets. Larger purchases may need to be depreciated, though several provisions allow immediate expensing in many cases. The choice isn't automatic, and taking the full deduction now isn't always the right answer if your income is climbing.
Professional services, software, supplies, advertising, and travel. All deductible when ordinary and necessary for the business. Meals have their own limitations, and entertainment is generally not deductible at all.
For a full rundown of what to have on hand when we sit down to prepare the actual return, see our document checklist for individual tax preparation.
The qualified business income deduction
Self-employed individuals may be able to deduct a percentage of qualified business income on top of their ordinary business deductions. It's a meaningful benefit, but it's limited at higher income levels, and for certain service businesses, including many consulting, health, legal, and financial fields, it phases out entirely.
The interaction between this deduction, your retirement contributions, and your entity structure is one of the genuinely complicated areas of self-employed tax planning. Actions that lower your taxable income can move you back under a phase-out threshold, which means a retirement contribution can be worth considerably more than its face value.
When to think about an S corporation
At a certain profit level, continuing as a sole proprietor means paying self-employment tax on all of your net earnings, subject to the Social Security wage base. Electing S corporation treatment lets you pay yourself a reasonable salary, subject to payroll taxes, and take remaining profit as a distribution that isn't.
The savings can be real. So can the costs: payroll processing, a separate business return, additional compliance, and the requirement that the salary actually be reasonable for the work performed. Setting it too low is a well-known audit issue, and we've written more on how reasonable S-corp compensation actually gets set.
There isn't a universal profit number where this flips. It depends on your income, your state, your benefits situation, and how much administrative overhead you're willing to carry. It's worth running the actual numbers before deciding, in either direction. If you want the fuller picture on when the math starts working in your favor, see the point where an S-corp actually starts saving you money.
Georgia specifics
Georgia taxes your self-employment income at the state level as well, with its own estimated payment requirements. Depending on where you operate, you may also have local business licensing or occupational tax obligations that have nothing to do with income tax but catch people by surprise. Cherokee County is a good example of how this plays out locally: see the license new business owners in Cherokee County always forget.
If you work with clients in other states, sourcing rules may pull some of that income into other jurisdictions, something that matters more as a practice grows.
The habit that makes all of this easier
Most of it comes down to a separate bank account for the business, with business income in, business expenses out, and transfers to the owner as needed.
It isn't a legal requirement for a sole proprietor, but it converts tax time from an archaeology project into a download. It also makes your deductions defensible, because the substantiation is built in rather than reconstructed.
If you want a second set of eyes
We work with freelancers, contractors, and owner-operated businesses across Georgia and beyond, both on the return itself and on the questions that come before it, like whether your structure still fits. That's part of what individual tax preparation with our firm actually covers.
This post is general information, not specific tax, accounting, or legal advice. Your situation may differ, so talk to us before acting on anything here.