Tax Filing Services for Small Businesses — Filed Right, On Time
Stop worrying about deadlines, extensions, and IRS penalties. Twelix handles your complete tax filing — federal, state, and quarterly estimated taxes.
What's Included in Tax Filing
Every US business tax deadline in one place
Missing a single filing deadline can cost thousands. Here is every date your business needs to know.
Q4 estimated tax payment (prior year)
Penalty: 0.5% per month on underpayment
Q1 estimated tax payment
Penalty: 0.5% per month on underpayment
Q2 estimated tax payment
Penalty: 0.5% per month on underpayment
Q3 estimated tax payment
Penalty: 0.5% per month on underpayment
Missing a Tax Deadline Is Not Just Stressful — It Is Expensive
IRS late-filing penalties start at 5% per month. Add interest, state penalties, and the cost of amending returns, and a missed deadline can cost thousands.
Missed Deadlines
Forgetting quarterly or annual filing dates leads to automatic penalties.
IRS Notices
Incorrect filings trigger notices, audits, and collection actions.
Multi-State Complexity
Operating in multiple states means multiple filing requirements.
Extension Confusion
Filing an extension does not extend payment deadlines. Many miss this.
What Are Tax Filing Services?
Tax filing services cover the complete preparation and electronic submission of your business tax returns to the IRS and state tax agencies. Twelix handles everything from data gathering to final submission, ensuring accuracy and compliance.
What You Get
Why businesses switch to Twelix
Most clients come to us after outgrowing DIY bookkeeping, losing confidence in their numbers, or realizing their current setup can’t keep up. Here’s what changes when Twelix takes over:
How It Works
A structured, repeatable process that takes the guesswork out of onboarding and monthly bookkeeping.
Tax Review
We review your books and prior returns for completeness.
Preparation
Returns prepared with every deduction and credit applied.
Your Approval
You review and approve before anything is submitted.
E-File & Confirm
We e-file and provide confirmation receipts for your records.
DIY software finds 4 of 12 deductions
Tax software catches the obvious ones. A bookkeeper who understands your business finds the rest.
| Deduction | DIY Software | Twelix |
|---|---|---|
| Home Office Deduction | ||
| Vehicle Mileage / Actual Expenses | ||
| Office Supplies & Software | ||
| Section 179 Equipment Depreciation | ||
| Qualified Business Income (QBI) Deduction | ||
| Health Insurance Deduction (Self-Employed) | ||
| Retirement Plan Contributions (SEP/SIMPLE) |
IRS late-filing penalties: 5% of unpaid taxes per month, up to 25%.
Transparent, Flat-Rate Pricing
No hourly billing. No hidden fees. One flat rate based on your transaction volume. See our plans or get a custom quote.
Quarterly estimated taxes demystified
Most small business owners overpay, underpay, or forget entirely. Here is what you actually need to know.
Estimated taxes are based on your expected annual income, deductions, and credits. Most businesses use the safe-harbor method: pay at least 100% of last year's tax liability (or 110% if AGI exceeds $150K) split into 4 equal payments. Twelix calculates the optimal amount each quarter so you don't overpay or underpay.
Q1 is due April 15, Q2 is due June 15, Q3 is due September 15, and Q4 is due January 15 of the following year. If the date falls on a weekend or holiday, the deadline shifts to the next business day. Twelix sets calendar reminders and prepares payment vouchers ahead of each deadline.
The IRS charges an underpayment penalty of approximately 8% annually (current rate) on the shortfall, calculated from the due date to when you actually pay. State penalties vary. Even if you file on time in April, you still owe underpayment penalties for missed quarterly installments.
If you expect to owe $1,000 or more in federal taxes for the year (after withholding and credits), you're generally required to make estimated payments. This applies to most self-employed individuals, S-corp shareholders, partners, and businesses with significant non-wage income.
Frequently Asked Questions
We file federal and state returns for sole proprietors, LLCs, S-corps, C-corps, and partnerships.
Yes. We calculate and file quarterly estimated tax payments to help you avoid underpayment penalties.
We handle multi-year filings. We will get you current, one year at a time, with minimal stress.
Flat-rate pricing based on entity type and complexity. No hourly billing. Contact us for a custom quote.
Absolutely. We file in all 50 states. If you operate across state lines, we ensure compliance everywhere.