Small Business Accounting Services in St. Louis, Missouri

Licensed CPAs Providing Full-Service Accounting for St. Louis Small Businesses, available for Every Filing Level and Every Deadline, Year-Round.

Operating a small business in St. Louis means managing financial obligations across three separate taxing authorities, including the IRS at the federal level, the Missouri Department of Revenue for state income tax and sales tax, and the City of St. Louis Collector of Revenue for the 1% business earnings tax and 0.5% payroll expense tax. On top of that, St. Louis employers manage Missouri unemployment insurance through the Division of Employment Security and, for businesses on the Illinois side of the bi-state metro, a completely separate set of state compliance requirements.

Most St. Louis small business owners are running their operations, managing employees, and serving clients, and trying to stay current with compliance deadlines, but it is more normally more complicated for them. The result is missed deductions, late filings, and compliance gaps.

World Tax and Accounting provides comprehensive small business accounting and professional accounting services for businesses throughout St. Louis City. Our team handles every financial function from monthly bookkeeping to St. Louis city earnings tax returns, under one engagement, with one licensed team.

Accounting Services for St. Louis Small Businesses

Monthly Bookkeeping and Reconciliation

Accurate, current books are the foundation of every other financial and compliance function. Our bookkeeping for startups and established businesses includes:

• Transaction recording for all income and expenses
• Monthly bank and credit card account reconciliation
• Accounts payable and receivable management
• Payroll journal entries and expense categorization
• Monthly profit and loss, balance sheet, and cash flow statements delivered on schedule

Payroll Processing and St. Louis Payroll Compliance

Payroll compliance in St. Louis operates at three levels simultaneously:

Federal:

• Payroll tax deposits through EFTPS, semi-weekly or monthly based on payroll size
• Quarterly Form 941 filings
• Annual Form 940 federal unemployment return
• W-2 and 1099-NEC preparation and filing by January 31

Missouri State:

• Missouri employer income tax withholding registration through the MyTax Missouri portal
• Missouri withholding tax remittances on an assigned schedule
• Missouri Division of Employment Security (DES) unemployment insurance, new employers start at a 2.376% rate on the first $9,500 of each employee’s wages per year
• Missouri new hire reporting within 20 days of each new hire

St. Louis City:

• St. Louis city earnings tax withholding, 1% of wages for employees who live or work within city limits
• Form E-9 registration with the City of St. Louis Collector of Revenue before first payroll
• 0.5% payroll expense tax, paid by the employer on all wages paid to employees working within city limits, filed separately from the earnings tax withholding

Missouri Sales Tax Compliance

Missouri imposes a state sales tax rate of 4.225%, relatively low at the state level, but local additions bring the combined rate in St. Louis City to approximately 9.68% in 2026. 

St. Louis businesses that sell taxable goods or services must:

• Register with the Missouri Department of Revenue through the MyTax Missouri portal before making first taxable sales
• Collect sales tax at the correct combined rate for each transaction location
• File returns on the DOR-assigned schedule, monthly, quarterly, or annual based on sales volume
• Remit all collected tax by the filing deadline

Our accounting services include Missouri sales tax registration, return preparation, and filing.

Business Tax Return Preparation

We prepare and file all required federal and Missouri business tax returns:

• Schedule C: Federal sole proprietor returns with full deduction review
• Form 1065 / Missouri MO-1065: Federal and state partnership returns
• Form 1120-S / Missouri MO-1120-S: S-Corp returns; Missouri S-Corps pay a flat 4.0% corporate income tax at the entity level before pass-through to owners
• Form 1120: C-Corp returns; Missouri C-Corps pay a flat 4.0% corporate income tax rate
• St. Louis City Business Earnings Tax return: All businesses located in St. Louis City, and non-resident businesses performing work within city limits, must file and pay a 1% business earnings tax, administered separately by the City Collector of Revenue

S-Corp Election Analysis and Filing

For St. Louis small business owners earning above the threshold where self-employment tax savings exceed filing costs, an S-Corp election can reduce federal self-employment tax significantly. Form 2553 must be filed by March 15 of the election year.

Our team evaluates S-Corp eligibility for every applicable client, prepares the Form 2553 election filing when the switch makes financial sense, and manages the ongoing Missouri and federal compliance the structure requires.

Financial Statement Preparation

We produce GAAP-compliant monthly financial statements, including income statements, balance sheets, and cash flow statements, that reflect your St. Louis business’s true financial position. Required for:

• SBA and commercial loan applications
• Investor presentations and private equity due diligence
• Government contract bids and vendor qualification
• Informed management decisions throughout the year

Quarterly Estimated Tax Payments

St. Louis business owners and self-employed professionals must make quarterly federal and Missouri estimated tax payments. Underpayment or missed payments result in IRS and Missouri DOR underpayment penalties. Our team calculates accurate quarterly estimates based on real year-to-date income and expense data.

Common Accounting Problems Our St. Louis Team Resolves

Books several months behind: One of the most common situations for new clients. We restore records and reconcile all accounts from the point they went off-track. Catch-up bookkeeping is a standard part of our onboarding for businesses coming from self-management or incomplete prior service.

City earnings tax account not registered: Many St. Louis small business owners have never registered Form E-9 with the City Collector of Revenue, accumulating city earnings tax liability from the date business activity began. We register the account, file all outstanding returns, and establish proper withholding going forward.

Missouri sales tax not registered: St. Louis businesses that began making taxable sales without registering with the Missouri DOR accumulate unregistered liability that the DOR can assess from the first transaction. We handle registration, back filing, and pursue penalty abatement through Missouri’s voluntary disclosure program where applicable.

1099 and W-2 errors: Incorrect or missing 1099-NEC forms for contractors, misclassified workers, or W-2 errors create IRS CP2100 notices and potential penalties. Our professional accounting services team reviews contractor classification, prepares all year-end forms correctly, and files them on time.

Our Process for Small Business Accounting

1 – Free Consultation and Compliance Review: A 30-minute call with a licensed CPA. We review your current accounting situation, identify any Missouri, city, or federal compliance gaps, and give you a clear picture of what full-service small business accounting looks like for your specific business.

2 – Onboarding and Records Setup: We set up or migrate your accounting software, establish your chart of accounts correctly for your industry and St. Louis tax environment, and bring any backlogged records current. 

3 – Monthly Accounting and All Filings Managed: Our accounting services run continuously throughout the year, including bookkeeping, payroll processing, reconciliations, and monthly financial statement delivery. Every required filing, including federal returns, Missouri state returns, city earnings tax return, sales tax, payroll tax, estimated payments, W-2s, and 1099-NEC forms, is prepared.

4 – Year-Round Tax Planning and Advisory: Our professional accounting services include proactive advisory throughout the year, including reviewing your financial performance, identifying deduction opportunities before year-end, evaluating S-Corp election timing, and managing your Missouri and federal tax position continuously rather than reactively.

5 – Scalable as Your Business Grows Whether you are a St. Louis sole proprietor with straightforward books or a multi-entity operation with complex compliance requirements across the bi-state metro, our small business accounting services scale to match your needs.

Why St. Louis Small Businesses Choose World Tax and Accounting

Managing all three tax levels with one team: Our small business tax accountant team handles federal, Missouri state, and St. Louis city earnings tax filings as a coordinated, integrated service. Most seasonal preparers do not specialize in this. 

Licensed CPAs on every engagement: Your accounting services are delivered under licensed CPA oversight. Every St. Louis client’s financials are reviewed by a credentialed professional legally accountable to you.

Bookkeeping for startups and established businesses: Whether you are a startup needing investor-ready financials from day one or an established St. Louis business that has outgrown your current accounting setup, our bookkeeping for startups and ongoing small business accounting services are built for your stage.

Full-service in a roof: Bookkeeping, payroll, Missouri and city tax compliance, IRS representation, tax resolution, and fractional CFO services are all provided internally at World Tax and Accounting. 

Transparent flat-fee pricing: Every engagement is quoted in writing before work begins, no hourly billing surprises, no escalating fees as your business grows.

Our Other Services in St. Louis, Missouri