File C Corporation Taxes Online with Accurate, Automated Form 1120 E-Filing
From book income to taxable income — X.TAX handles the reconciliations and the 21% calculation so your Form 1120 is right the first time.
RECONCILIATION
Where your books and the IRS finally agree
Book income and taxable income are never the same number. We handle every adjustment in between.
Automatic Schedule M-1 and M-3 reconciliation
Common add-backs applied for you — depreciation, meals, penalties, accruals
Every book-to-tax difference traceable line by line
A clean, audit-ready trail from your financials to your return
Reconciled automatically
book income mapped to taxable income without manual entry
M-1 and M-3 handled
every adjustment tracked and categorized
Nothing missed
common add-backs and deductions applied as you go
Audit-ready trail
every difference documented and traceable
Why C-Corps choose X.TAX
Built to simplify corporate filing while keeping costs predictable.
Reconciliation Done For You
Book-to-tax differences flow into Schedules M-1 and M-3 automatically, no manual mapping.
Estimated Payments, Tracked
We reconcile your quarterly payments against tax due so there are no surprises.
Built for the Corporate Return
Every 1120 schedule handled natively — M-1, M-3, balance sheet, and the dividends-received deduction.
How it works
From financials to filed – In four steps
From first click to IRS acceptance - no manual data entry, no guesswork.
01
Add Your Financials, Your Way
Enter manually, upload your files, or connect your accounting software.
Secure Setup
Import Data
02
Add Corporate Details
Organize income, deductions, capital accounts, and tax adjustments.
Shareholder Details
Capital Accounts
03
Review Summary
Verify partner allocations, payments, ownership, and K-1 details.
Schedule Review
Tax Summary
04
E-File with IRS
Submit your 1120 and any estimated-payment vouchers.
IRS Authorized
Secure Filing
Ready to File Your Return?
Get started in minutes and only pay when you're ready to file.
pricing
Priced per return, not per headache
Flat per-return pricing that doesn't grow with your complexity — see your estimate before you commit.
IRS-authorized e-filing included
Automatic Schedule M-1 and M-3 reconciliation
Transparent, flat-rate pricing
Expert review and audit protection at add-on cost
State filing support available
Average savings
Save an average of $2,241 per filing compared to traditional CPA preparation and filing costs.
Estimate Your Filing Cost
No payment until you're ready to file
faq
Frequently asked questions
What records do I need for Form 1120?
When is a C corporation Form 1120 due?
Can X.TAX help me e-file Form 1120?
How do I report corporate dividends and distributions?
Can I extend my C corporation return?
What if I need to correct Form 1120 after filing?
Still have questions?
IRS Authorized e-File Provider
Let's Get Your C-Corp Filed
Book income reconciled, corporate tax calculated, e-filed with the IRS — all in one workflow.
No payment until you file
IRS-authorized e-file
One Flat Price
