St. Charles CPAs for Small Business and Contractors
St. Charles County has grown into one of the most active small business markets in greater St. Louis. Trades and contractors, retail and restaurants along Main Street, professional services up and down Highway 70, and a steady mix of young families and retirees. The CPA work has to match that range.
Thompson Flaherty is an Illinois and Missouri-licensed CPA firm. We work with St. Charles County small business owners and families who want a year-round CPA relationship. To start that conversation, get in touch with our team.
St. Charles County Areas We Serve
St. Charles, St. Peters, O’Fallon, Cottleville, Weldon Spring, Wentzville, and the rural areas in between. Most engagements are virtual, but we will meet in person when the situation calls for it.
What a St. Charles CPA Costs
Pricing in St. Charles County is consistent with the broader St. Louis metro. Tax return only (S-corp or LLC) runs roughly $1,200 to $3,000. Monthly bookkeeping is typically $400 to $1,500 a month. A year-round CPA engagement with bookkeeping, strategy, and quarterly check-ins lands most clients between $1,200 and $3,000 a month, all-in. We quote real numbers after a 30-minute intro call.
Missouri Tax Issues St. Charles Owners Run Into Most
Missouri’s individual income tax rates change from year to year, and for most St. Charles contractors and trades businesses the rate is not where the money is anyway. The bigger issues are sales and use tax compliance on materials, the Missouri Pass-Through Entity Tax election when the federal SALT cap is in play, and worker classification between W-2 and 1099, which Missouri enforces seriously and which gets expensive when it is wrong.
If any of your crews work inside St. Louis city limits, the city earnings tax applies to them and withholding is your obligation. We explain who it reaches in our breakdown of the St. Louis earnings tax. We work current Missouri Department of Revenue and Department of Labor rules into every engagement.
When Should a St. Charles Business Switch to an S-Corp?
When net business profit is comfortably above a reasonable W-2 salary for the work, the S-corp election starts saving self-employment tax. For most St. Charles single-owner businesses that point arrives once profit is consistently well clear of what you would have to pay yourself as a reasonable salary, but the threshold is genuinely situational. It moves with the industry, the owner’s other income, and Missouri-side considerations like the PTE election, so it is worth modelling rather than assuming. We walk through it on our business tax planning page.
Industries We Work With in St. Charles
Trades and contractors, independent restaurants and retail, healthcare and dental practices, professional services, and small manufacturing. Generalist firm by design, which means you work with one CPA who knows the whole picture.
How to Start
Schedule a 30-minute intro call through our contact page. No cost, no pressure, and we will tell you honestly whether Thompson Flaherty is the right fit.
Related St. Louis Pages
- St. Louis CPA services, the main page for the firm’s work across the metro.
- St. Louis tax accountant, for tax preparation and year-round planning.
- St. Louis bookkeeping, for monthly bookkeeping and financial statements.
- University City CPAs, including the Delmar Loop.
- Clayton tax accountants, for professionals and executives.
Frequently Asked Questions About St. Charles CPAs
Do you have an office in St. Charles County?
No. We are based in Edwardsville and serve St. Charles, St. Peters, O’Fallon and the surrounding area. Most of the relationship runs virtually, and we meet in person when the situation calls for it.
What does a St. Charles CPA cost?
A tax return on its own, S-corp or LLC, runs roughly $1,200 to $3,000. Monthly bookkeeping is typically $400 to $1,500 a month. A year-round engagement with bookkeeping, strategy and quarterly check-ins lands most clients between $1,200 and $3,000 a month.
Do you work with contractors and trades businesses?
Yes, they are a large share of the St. Charles County client base. The recurring issues are sales and use tax on materials, worker classification between W-2 and 1099, and job-level profitability that the books are rarely set up to show.
When does an S-corp election make sense?
Once profit is consistently well clear of what you would have to pay yourself as a reasonable salary. The exact point is situational, so it is worth modelling against your industry and other income rather than assuming a threshold.