Corporate Tax Filing.
Done Right.
Every Year.
Navigating corporate tax requirements shouldn't be a burden. We specialize in federal and state tax filing for all business structures — ensuring you stay compliant, meet every IRS deadline, and pay only what you legally owe.
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Which Return Does
Your Business Need?
Every entity type has its own forms, rules, and deadlines. We handle all of them — with full accuracy and zero missed deductions.
C-Corporation
Specialized tax preparation for C-Corps — ensuring compliance with federal and state regulations, strategic planning to minimize double taxation on distributions, and full utilization of corporate deductions.
- Federal Form 1120 preparation & filing
- State corporate income tax returns
- Dividend and distribution planning
- Corporate deduction optimization
- Accumulated earnings analysis
- Quarterly estimated tax payments
S-Corporation
Strategic filing for S-Corp pass-through entities — ensuring shareholders report income and credits correctly, with reasonable compensation analysis and maximum self-employment tax savings built in.
- Federal Form 1120-S preparation & filing
- K-1 preparation for all shareholders
- Reasonable salary / compensation analysis
- State S-Corp returns (all 50 states)
- Shareholder basis tracking
- Built-in gains tax analysis
Partnership / LLC
Comprehensive reporting for multi-member LLCs and partnerships — including K-1 distributions, guaranteed payments, and correct allocation of income, deductions, and credits to every partner.
- Federal Form 1065 preparation & filing
- K-1 preparation for every partner
- Guaranteed payments analysis
- Partnership basis and at-risk calculations
- State partnership returns
- Section 754 elections (if applicable)
What Happens When
Business Taxes Go Wrong
Corporate tax errors are expensive — and the IRS has more resources than ever to find them.
Common Business Tax Mistakes
- Wrong entity type filed — IRS reclassification triggers back taxes and penalties
- K-1s prepared incorrectly — shareholders face unexpected personal tax bills
- Missed deductions — overpaying by thousands every year
- Late filing — automatic penalties of 5% per month, up to 25%
- Unreasonable S-Corp salary — IRS audit red flag, self-employment tax reassessed
- Multi-state nexus ignored — surprise state liabilities discovered years later
With WELFO Business Tax Filing
- Correct entity filing every time — no reclassification surprises
- K-1s prepared accurately — every shareholder gets the right numbers
- Every available deduction captured — nothing left on the table
- Filed on time, every time — extensions managed proactively
- Reasonable compensation documented and defensible to the IRS
- Multi-state compliance reviewed — no hidden liabilities waiting to surface
Everything Included in
Business Tax Filing
Beyond the core return — all the additional services that keep your business fully compliant.
Multi-Year Tax Filings
Behind on business taxes? We file overdue returns for multiple prior years simultaneously — with penalty abatement requests where applicable to reduce what you owe.
State & Franchise Tax
State-level income taxes and franchise taxes in all 50 states — including nexus analysis for multi-state operations so nothing gets missed.
Quarterly Estimated Taxes
Accurate quarterly estimated tax calculations and scheduling — so your business avoids underpayment penalties and you're never surprised by a large year-end bill.
Tax Extension Filing
Need more time? We file Form 7004 before the deadline — buying you up to 6 additional months without incurring late-filing penalties.
K-1 Preparation
Accurate Schedule K-1 for every partner and shareholder — so each person's personal tax return reflects the correct pass-through income, deductions, and credits.
IRS Audit Support
If your return is selected for examination, we represent you directly before the IRS — with full Enrolled Agent authority to respond, negotiate, and resolve on your behalf.
We had three years of unfiled S-Corp returns and were terrified of the IRS. WELFO filed everything, got the penalties substantially reduced, and set up a payment plan. The penalty savings alone more than covered their fee several times over.
Your Business Return,
Start to Finish*
Seven stages, from the first upload to accepted filings. Progress is visible in your client portal.
* Illustration of one typical scenario. Stages, order and timing vary with your situation and with IRS and state processing.
How Profit Reaches
Your Personal Return*
For S-Corps and partnerships, the business pays no income tax itself. Profit passes to each owner, and the same CPA prepares both returns.
* Illustration with example ownership split. Allocation follows your operating or partnership agreement.
Business Tax
Filing Deadlines
Missing a business tax deadline triggers automatic penalties. We file on time — or request an extension proactively if more time is needed.
| Entity | Form | Due Date | Extended |
|---|---|---|---|
| S-Corporation | 1120-S | March 15 | Sept 15 |
| Partnership | 1065 | March 15 | Sept 15 |
| C-Corporation | 1120 | April 15 | Oct 15 |
| Single-Member LLC | Sch. C | April 15 | Oct 15 |
* Dates shown for calendar-year entities. Fiscal-year businesses have different due dates.
What Late Filing
Actually Costs
5% of unpaid taxes per month, up to 25% of the total. Applies from the first day past the deadline.
0.5% per month on unpaid taxes, up to 25%. Accrues even if an extension was filed — extensions extend the deadline, not the payment.
$245 per partner/shareholder per month for late Forms 1065 and 1120-S — even if no tax is owed.
IRS interest compounds daily on any unpaid balance from the original due date until paid in full.
Why Businesses
Choose WELFO
| What you get | DIY / Tax Software | Large Accounting Firm | WELFO |
|---|---|---|---|
| Licensed CPA prepares your return | No professional review | Sometimes (junior staff) | ✓ |
| Enrolled Agent — IRS representation | ✕ | Varies | ✓ |
| Flat-fee pricing upfront | Software cost + your time | Hourly billing | ✓ |
| 24-hour response guarantee | — | Days or weeks | ✓ |
| K-1s + personal returns — same CPA | ✕ | Usually separate | ✓ |
| Multi-year catch-up filing | Complex / error-prone | (but expensive) | ✓ |
| Bilingual English & Russian | — | Rarely | ✓ |
| All 50 states covered | Partial | ✕ | ✓ |
Business Tax Questions,
Answered Honestly
File Your Business Taxes
With a Real CPA
Accurate returns, maximum deductions, zero missed deadlines. Get a flat-fee quote today.
All entity types · All 50 states · Flat-fee · English & Russian