Starting a Business Tax Questions: What You Owe From Day One
You formed an LLC, started freelancing, or opened a business. Now the tax questions start arriving: Do I need an EIN? When do estimated payments start? What can I deduct? Should I stay a sole proprietor or make an S-corp election? These are questions with real answers, and getting them wrong in year one creates problems that take years to fix.
Signs You May Be in This Situation
How Common Business Structures Are Taxed
The legal structure you choose affects how income flows to your personal return and what forms you file. Here is how the most common structures work from a federal tax standpoint.
All business income and expenses go on Schedule C of your Form 1040. Net profit is subject to income tax plus the 15.3% self-employment tax. No separate business return is required. The simplest structure, but all profit is taxed whether or not you take it out.
Taxed identically to a sole proprietorship by default: Schedule C, self-employment tax on net profit. The LLC is a Virginia state-law legal entity, not a separate tax category. It does not change your federal tax unless you elect S-corp or C-corp treatment. See IRS Publication 3402.
Requires a separate Form 1120-S and payroll for owner-employees. Income splits between a reasonable salary (subject to payroll taxes) and pass-through distributions (not subject to SE tax). Can reduce SE tax significantly at higher income levels. Adds cost and complexity. Requires IRS Form 2553 to elect.
Requires a separate Form 1065 (Partnership Return) and Schedule K-1 for each partner. Partners pay self-employment tax on their share of active business income. Adds complexity and a separate filing obligation. Partners must make their own estimated payments based on their K-1 income.
Why New Business Owners Get Into Tax Trouble
Most tax problems for new businesses are not complicated. They come from a small number of things that nobody told the owner at the start.
- No withholding means no safety net. Business income arrives in full, with no taxes removed. The owner spends the money, and the tax bill arrives in April. Without quarterly estimated payments, a large balance due plus an underpayment penalty under IRC Section 6654 is the typical result.
- Start-up costs have specific rules. Expenses incurred before the business opens are not immediately deductible as regular business expenses. Under IRC Section 195, up to $5,000 in start-up costs can be deducted in the first year of operation. The rest must be amortized over 180 months. Many new owners either deduct them all at once or don't deduct them at all.
- Mixing personal and business money creates problems. When business and personal transactions run through the same account, distinguishing deductible business expenses from personal spending becomes difficult at tax time and impossible to defend under audit. The IRS expects a clear separation.
- The wrong structure decision is hard to undo cleanly. Electing S-corp treatment too early, or staying a sole proprietor for too long, both have tax consequences. The right choice depends on actual net income, not what you expect the income to be. Choosing before the numbers support it adds cost without the corresponding benefit.
What Can Go Wrong in Year One
Risks for New Business Owners
- Large unexpected tax bill in April because no estimated payments were made during the year
- Underpayment penalty under IRC Section 6654 even if you pay the full amount owed by the filing deadline
- Start-up costs deducted incorrectly, either all at once (not allowed) or not at all (missed deduction)
- Business and personal finances mixed, making it impossible to substantiate deductions under audit
- Missing Virginia Business, Professional, and Occupational License (BPOL) registration in your locality
- S-corp election made before income supports it, adding payroll cost and complexity with no tax benefit
- Failure to file Form 1065 for a multi-member LLC, which triggers a separate IRS penalty per partner per month
Getting the Tax Side Right From the Start
An EIN is free from IRS.gov and takes minutes online. A separate business account is not legally required for a sole proprietor, but it is practically essential for clean records and clear deduction documentation.
A common rule of thumb for new sole proprietors and single-member LLCs: set aside 25 to 30% of every business payment received. The actual amount varies based on your total income, deductions, and filing status. LMN Tax can help you calculate a more precise number based on your situation.
Use IRS Form 1040-ES to calculate and pay quarterly estimates. If you skip the first quarter and catch up later, the penalty is calculated on the shortfall for each period individually, not just the total owed at year end. See IRS Publication 505.
Even a simple spreadsheet tracking income and categorized expenses is enough to start. The goal is a clear record of what came in, what went out, and which expenses are business-related. Clean books make tax prep faster and deductions defensible.
Most businesses operating in Virginia must register with the Virginia State Corporation Commission. Many localities in Northern Virginia also require a local business license. Check requirements at scc.virginia.gov and with your county or city business licensing office.
Structure decisions are best made based on actual net income, not projections. Once you have a full year of business income, LMN Tax can review whether your current structure is still the right one or whether a change would reduce your tax liability.
Business Tax Preparation and Advisory for New Business Owners
LMN Tax works with new business owners from their first year of operations. That includes preparing Schedule C returns and business entity returns, reviewing structure decisions, setting up estimated payment schedules, and helping with bookkeeping for clients who need it.
New Business Tax Questions
- Do I need an EIN when I start a business?
- A sole proprietor with no employees can use their SSN for federal tax purposes, but an EIN is generally recommended. It is required if you have employees, operate as a partnership or corporation, or have certain retirement plans. Apply for free at IRS.gov.
- What is the difference between a sole proprietorship and an LLC for tax purposes?
- Both are taxed identically by default: Schedule C, self-employment tax on net profit. The LLC is a state legal structure, not a federal tax category. It does not change your federal taxes unless you make an election. A multi-member LLC is taxed as a partnership by default and requires Form 1065.
- When do I have to start paying quarterly estimated taxes?
- When you expect to owe at least $1,000 in federal income tax after withholding and credits. Start in the first quarter you expect to reach that threshold. Due dates are April 15, June 15, September 15, and January 15. Missing payments can trigger a penalty under IRC Section 6654.
- What business expenses can I deduct when I start a business?
- Once operating, you can deduct ordinary and necessary business expenses on Schedule C: mileage, home office, equipment, software, advertising, insurance, professional fees, and supplies. Start-up costs before opening are handled separately: up to $5,000 deductible in year one, the rest amortized over 180 months under IRC Section 195.
- Do I need to register my business in Virginia?
- Most businesses in Virginia must register with the Virginia State Corporation Commission. LLCs and corporations must be formed through the SCC. Many Northern Virginia localities also require a Business, Professional, and Occupational License (BPOL). Requirements vary by business type and location.
- Should I make an S-corp election for my LLC?
- An S-corp election (Form 2553) can reduce SE tax by splitting income between a salary and distributions. The salary is subject to payroll taxes; distributions are not. It generally makes sense only when net profit is high enough that the savings outweigh the added payroll cost and complexity. LMN Tax can review your numbers and give you a direct answer.
- What records should I keep when I run my own business?
- Keep bank statements, receipts for all expenses, mileage logs, invoices, and payroll records. The general rule is to retain records for at least three years from the filing date, or two years from when you paid the tax, whichever is later. Employment tax records: at least four years.
Source: IRS EIN Application; IRS Publication 1635
Source: IRS Publication 3402 (Taxation of Limited Liability Companies)
Source: IRS Publication 505; IRS Form 1040-ES; IRC Section 6654
Source: IRS Publication 535; IRC Section 195; IRC Section 280A (home office)
Source: Virginia State Corporation Commission (scc.virginia.gov)
Source: IRS Form 2553; IRS Publication 3402
Source: IRS Publication 583 (Starting a Business and Keeping Records)
Starting or Running a Business in Northern Virginia?
LMN Tax works with new and growing small businesses. Get the tax side set up correctly from the start instead of untangling problems after the first year is over.
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