First-Year Business Tax Checklist: Business Setup, IRS Requirements & Your First Tax Filing Guide
Rick Patel
on
Starting a business is exciting. The tax side of it, less so.
You are building a product, chasing customers, hiring your first person, and somewhere in the background, the IRS is quietly building a list of things you owe.
Miss one and penalties hit before you file your first return.
Most first-year founders learn this the hard way: they pick an entity because a friend said "just do an LLC," they forget 1099s, they skip quarterly estimated taxes, and by April they are staring down a tax bill they never planned for.
The SBA counts 36.2 million small businesses in the country, and a big chunk are in year one, figuring this out in real time.
If you launched a business this year and the tax side is stressing you out, you are not alone. First-year setup is where most mistakes get baked in and where the biggest savings get left on the table.
Virtue Advisors works with new founders from entity pick through the first year-end filing, so paperwork, deadlines, and deductions get handled before they become problems.
Whether you are a solo consultant, a two-person startup, or a foreign founder, our team walks you through business tax preparation that is compliant and cheaper than winging it.
This guide covers what a first-year owner needs to check off, from entity selection and EIN through quarterly payments, deductions, and the exact forms hitting your calendar in 2026 and 2027.
Key Takeaways
- Your entity choice (sole prop, LLC, S-Corp, C-Corp) determines your forms, your tax rate, and how much self-employment tax you owe. Fix this in year one, not year three.
- Get your EIN directly from the IRS. It is free, takes minutes online, and you need it for banking, hiring, and every tax filing.
- Section 195 lets you deduct up to $5,000 of startup costs and $5,000 of organizational costs in year one. Track them from day one.
- Quarterly estimated taxes are due April 15, June 15, September 15, and January 15 if you expect to owe $1,000 or more in federal tax.
- Calendar-year Form 1120-S and Form 1065 are due March 16, 2026. Form 1120 and Form 1040 with Schedule C are due April 15, 2026.
- US-formed entities are exempt from BOI reporting to FinCEN as of March 26, 2025. Foreign entities registered in the US still file.
- Separate bank accounts, clean bookkeeping, and issued 1099-NECs by January 31 are the boring habits that save the biggest money at filing time.
Step 1: Pick the Right Business Entity Before You Do Anything Else
Your entity choice drives every other tax decision. Change it later and you may trigger new EINs, new tax elections, and retroactive paperwork. Get it right in year one.
The five common structures, and how the IRS taxes each:
| Entity | Default Tax Treatment | Federal Return | Owner-Level Filing |
|---|---|---|---|
| Sole Proprietorship | Individual income | Schedule C on Form 1040 | Same as personal return |
| Single-Member LLC | Disregarded entity | Schedule C on Form 1040 | Same as personal return |
| Partnership / Multi-Member LLC | Pass-through | Form 1065 + K-1s | Members report on Form 1040 |
| S-Corporation | Pass-through | Form 1120-S + K-1s | Shareholders report on Form 1040 |
| C-Corporation | Separate taxpayer, 21% | Form 1120 | Dividends taxed on owner's Form 1040 |
Per IRS Publication 583, your form of business determines which return you file and which taxes apply.
Two questions decide most first-year picks.
- First: do you plan to raise venture capital or issue stock? If yes, a Delaware C-Corp is almost always the answer.
- Second: will annual profit comfortably exceed $80,000 to $100,000? If yes, an S-Corp election on your LLC can cut self-employment tax by splitting pay between salary and distributions.
For most solo consultants and service businesses in year one, a single-member LLC keeps things simple: one return, one Schedule C, full liability protection.
Step 2: Register Your Business at the State Level
Register your entity with the Secretary of State in your formation state.
LLCs file Articles of Organization. Corporations file Articles of Incorporation. Fees range from $50 to $500 depending on the state, and processing takes a few days to two weeks.
Quick state notes:
- Delaware is popular for corporations expecting outside investment. Investor-friendly law, but you pay annual franchise tax.
- Wyoming and Nevada offer privacy and no state income tax.
- Texas and Florida are business-friendly with no state income tax.
- Your home state is often the cheapest option if your operation runs there. Forming elsewhere means qualifying as a foreign entity at home anyway, doubling compliance.
If you are an international founder, entity selection and state registration are the two decisions most likely to go sideways without help. Virtue Advisors' US Entity Setup Service handles state filings, EIN, registered agent, and banking coordination.
Step 3: Get Your Federal EIN
Your Employer Identification Number is your business's Social Security number.
You need it to open a business bank account, hire employees, file taxes, and issue 1099s. Even if you stay solo, get one.
Apply directly on the IRS EIN page. The online application is free and you get the EIN immediately if the responsible party has an SSN or ITIN. Foreign founders without an SSN or ITIN apply by fax or mail, which takes one to three weeks.
Two rules that trip first-year owners: form your legal entity first, then apply for the EIN (out of order and you redo it); and you can only apply for one EIN per responsible party per day.</p.
Step 4: Separate Your Business Finances Immediately
Open a business bank account and business credit card as soon as your entity is registered and EIN is in hand. Run 100% of income and expenses through that account.
Mixing personal and business money is the fastest way to lose your liability protection. Courts call it "piercing the corporate veil," meaning your personal assets become fair game if the business is sued. It also makes bookkeeping painful, since you spend hours untangling which Amazon charge was groceries and which was office supplies.
Pay yourself by transferring from the business account to your personal account, not by using the business card for personal purchases.
Step 5: Understand Which Federal Taxes You Owe
Depending on your entity and activity, some or all of these federal taxes apply in year one:
- Income tax on business profits (rate depends on entity)
- Self-employment tax at 15.3% for sole proprietors, single-member LLC owners, and partners
- taxes (Social Security, Medicare, federal unemployment) if you have W-2 employees
- Excise taxes if you sell specific products (fuel, tobacco, alcohol, indoor tanning)
- Estimated quarterly taxes if you expect to owe $1,000 or more
Self-employment tax catches almost every first-year sole prop and single-member LLC owner off guard. On $100,000 of net profit, you owe roughly $14,130 in SE tax before you calculate income tax.
That is why founders who reach consistent six-figure profit often elect S-Corp status: paying yourself a reasonable salary plus distributions cuts the SE tax bill materially.
If you sell across state lines or online, add sales tax to that list. Post-Wayfair (2018), economic nexus rules mean you can owe sales tax in states where you have no physical presence.
Our state and local tax compliance team maps where you have nexus and registers you where you owe. For effective rates by entity, see our small business tax rates guide.
Not sure which entity or tax structure fits your business?
Step 6: Track Startup Costs From Day One (Section 195)
The federal tax system is pay-as-you-go. If you expect to owe $1,000 or more when you file, the IRS wants you to send in estimated payments four times a year. Miss them, and you owe an underpayment penalty on top of the tax.
The 2026 quarterly deadlines for individual estimated tax:
| Quarter | Income Period | Deadline |
|---|---|---|
| Q1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Q2 | Apr 1 – May 31, 2026 | June 15, 2026 |
| Q3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
Sole proprietors, single-member LLC owners, partners, and S-Corp shareholders use Form 1040-ES. C-Corps use Form 1120-W.
Year one has no prior tax bill to safe-harbor against, so the simplest approach is to estimate profit conservatively, multiply by your combined federal and state rate, divide by four, and send it in each quarter. True up at filing.
Step 10: Know Your First-Year Filing Deadlines
The IRS 2026 tax calendar sets the calendar-year deadlines a first-year owner needs to know:
- March 16, 2026 (March 15 is a Sunday): Form 1120-S (S-Corps), Form 1065 (partnerships and multi-member LLCs), Schedule K-1s to owners
- April 15, 2026: Form 1120 (C-Corps), Form 1040 with Schedule C (sole props and single-member LLCs)
- January 31: W-2s to employees, 1099-NECs to contractors, Form 940 (annual FUTA)
- April 30, July 31, October 31, January 31: Form 941 (quarterly payroll)
If you cannot file by the deadline, request an extension with Form 7004 (business returns) or Form 4868 (individuals). Extensions give you more time to file, not more time to pay. If you owe, pay by the original deadline or accrue penalties and interest.
Step 11: Maximize First-Year Deductions and Credits
Year one is deduction-heavy: you are spending to build and generating little income. Every dollar you deduct correctly reduces the tax you owe.
The deductions first-year owners most often miss:
- Section 195 startup and organizational costs (up to $5,000 each)
- Home office (simplified: $5 per sq ft up to 300 sq ft, or actual expenses)
- Business mileage at the standard IRS rate (check current-year rate on IRS.gov)
- Equipment and software under Section 179 or bonus depreciation
- Business insurance and self-employed health insurance premiums
- Retirement contributions (SEP-IRA, Solo 401(k), SIMPLE IRA)
- Meals at 50%, with business purpose documented
- Professional services (CPA, attorney, consultant fees)
The Qualified Business Income (QBI) deduction lets eligible pass-through owners deduct up to 20% of qualified business income. Under the One Big Beautiful Bill Act, QBI is now permanent, with a $400 minimum deduction for businesses with at least $1,000 of active income starting in 2026.
Specified service trades (health, law, accounting, consulting) have income-based phase-outs, so check with a CPA.
Behind on bookkeeping or dreading your first payroll run?
Step 9: Pay Quarterly Estimated Taxes (or Face Penalties)
The federal tax system is pay-as-you-go. If you expect to owe $1,000 or more when you file, the IRS wants you to send in estimated payments four times a year. Miss them, and you owe an underpayment penalty on top of the tax.
The 2026 quarterly deadlines for individual estimated tax:
| Quarter | Income Period | Deadline |
|---|---|---|
| Q1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Q2 | Apr 1 – May 31, 2026 | June 15, 2026 |
| Q3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
Sole proprietors, single-member LLC owners, partners, and S-Corp shareholders use Form 1040-ES. C-Corps use Form 1120-W.
Year one has no prior tax bill to safe-harbor against, so the simplest approach is to estimate profit conservatively, multiply by your combined federal and state rate, divide by four, and send it in each quarter. True up at filing.
Step 10: Know Your First-Year Filing Deadlines
The IRS 2026 tax calendar sets the calendar-year deadlines a first-year owner needs to know:
- March 16, 2026 (March 15 is a Sunday): Form 1120-S (S-Corps), Form 1065 (partnerships and multi-member LLCs), Schedule K-1s to owners
- April 15, 2026: Form 1120 (C-Corps), Form 1040 with Schedule C (sole props and single-member LLCs)
- January 31: W-2s to employees, 1099-NECs to contractors, Form 940 (annual FUTA)
- April 30, July 31, October 31, January 31: Form 941 (quarterly payroll)
If you cannot file by the deadline, request an extension with Form 7004 (business returns) or Form 4868 (individuals). Extensions give you more time to file, not more time to pay. If you owe, pay by the original deadline or accrue penalties and interest.
Step 11: Maximize First-Year Deductions and Credits
Year one is deduction-heavy: you are spending to build and generating little income. Every dollar you deduct correctly reduces the tax you owe.
The deductions first-year owners most often miss:
- Section 195 startup and organizational costs (up to $5,000 each)
- Home office (simplified: $5 per sq ft up to 300 sq ft, or actual expenses)
- Business mileage at the standard IRS rate (check current-year rate on IRS.gov)
- Equipment and software under Section 179 or bonus depreciation
- Business insurance and self-employed health insurance premiums
- Retirement contributions (SEP-IRA, Solo 401(k), SIMPLE IRA)
- Meals at 50%, with business purpose documented
- Professional services (CPA, attorney, consultant fees)
The Qualified Business Income (QBI) deduction lets eligible pass-through owners deduct up to 20% of qualified business income. Under the One Big Beautiful Bill Act, QBI is now permanent, with a $400 minimum deduction for businesses with at least $1,000 of active income starting in 2026.
Specified service trades (health, law, accounting, consulting) have income-based phase-outs, so check with a CPA.
Want to know which deductions actually apply to your business?
Step 12: State, Local, and Compliance Housekeeping
Federal is only half the picture. Depending on where you formed and operate, you may owe:
- State income tax on business profits
- State franchise or LLC tax (California charges a minimum $800 franchise tax regardless of income)
- State and local sales tax where you have nexus
- Local business license fees, property tax, and state unemployment if applicable
Federal and state rules diverge in ways that catch new owners off guard. A single-member LLC might owe nothing federally but still owe a state minimum tax. Our federal vs state tax filing guide breaks down how the two systems interact.
BOI reporting update: Per FinCEN's March 26, 2025 interim final rule, all US-formed entities and US persons are now exempt from Beneficial Ownership Information reporting under the Corporate Transparency Act.
Only foreign entities registered to do business in the US still file. If someone quotes old CTA guidance about filing BOI as a US LLC, the rule changed. You do not need to file.
Step 13: Avoid the First-Year Tax Mistakes That Sink New Owners
The most common (and expensive) first-year mistakes:
- Picking the wrong entity and paying thousands more in SE tax than needed
- Mixing personal and business money and losing liability protection
- Skipping quarterly estimated taxes and paying underpayment penalties on top of the tax
- Missing 1099-NEC deadlines and paying per-form penalties
- Forgetting Section 195 startup costs and losing a $10,000 combined deduction
- Waiting until March to start bookkeeping and paying your CPA 3x normal fees to clean up
- Ignoring state nexus when you sell online, and getting a nasty letter two years later
- Filing late without an extension and eating the 5% per month failure-to-file penalty (capped at 25%)
Every one is preventable with a system in place before year-end. That is the case for a good first-year CPA relationship: not tax return production, but planning that stops mistakes before they hit the return.
Where Virtue Advisors Fits In
Virtue Advisors is a US-based CPA and advisory firm working with first-year founders across the country from our Alpharetta, Georgia office.
Our team combines 100+ years of experience across tax, accounting, and advisory, and builds first-year setups that stay compliant as the business grows. Entity setup, EIN and state registration, bookkeeping, payroll, quarterly tax planning, and your first business tax return reviewed by a CPA: we handle it end-to-end.
If you would rather focus on building than debugging tax paperwork, reach out through our contact page or book a discovery call with founder Kevin Patel, CPA.
Ready to hand off your first-year tax setup to a CPA?
Frequently Asked Questions
