Real Results for DuPage County Businesses
Every business that comes to DWK Tax & Accounting has a unique challenge. These anonymized case studies illustrate the kind of work David Korzeniowski, CPA does every day, from tax strategy to bookkeeping rescue to payroll compliance.
Construction Contractor Tax Reduction
The Problem
A residential remodeling contractor operating as a single-member LLC was paying self-employment tax on all business income. With no entity structure in place and no proactive tax planning, the owner was overpaying at tax time and had no strategy for retirement contributions or estimated payments.
The Solution
David Korzeniowski evaluated the business financials and recommended an S corporation election. He guided the owner through the election process, established reasonable compensation, set up quarterly estimated tax payments, and implemented a tax-efficient retirement contribution strategy.
The Outcome
The S corp election reduced the owner's self-employment tax burden significantly. With quarterly estimates properly calibrated, the owner avoided both overpayment and underpayment penalties. The retirement contribution strategy provided additional tax savings while building long-term wealth.
Restaurant Bookkeeping Cleanup
The Problem
A restaurant owner in DuPage County had fallen behind on bookkeeping for multiple quarters. Transactions were uncategorized, POS data wasn't reconciled with bank statements, and the owner had no clear picture of food costs, labor costs, or profitability. Tax filing deadlines were approaching with no clean financials to work from.
The Solution
David performed a comprehensive bookkeeping cleanup, reconciling bank and credit card accounts, categorizing months of transactions, integrating POS sales data, and establishing proper chart of accounts for restaurant operations. He then set up a monthly bookkeeping cadence to prevent future backlog.
The Outcome
The restaurant owner received clean, tax-ready financial statements and a clear understanding of food costs and labor ratios. With monthly bookkeeping in place, the owner can now make informed pricing and staffing decisions. Tax filing was completed accurately and on time.
Services Used
QuickBooks Rescue & Recovery
The Problem
A small professional services firm had attempted to manage QuickBooks internally. Over time, duplicate entries accumulated, bank reconciliations were broken, and the chart of accounts had become cluttered with unused and misclassified categories. The books were unreliable, and the owner had lost confidence in the financial data.
The Solution
David conducted a full QuickBooks diagnostic, removed duplicate entries, repaired broken reconciliations, streamlined the chart of accounts, and reclassified misposted transactions. He then trained the firm's staff on proper data entry workflows and set up monthly review checkpoints.
The Outcome
The firm's QuickBooks file was restored to accuracy and reliability. With a clean chart of accounts and trained staff, day-to-day bookkeeping runs smoothly. Monthly CPA review ensures small issues are caught early, before they become major problems at tax time.
Payroll Compliance Correction
The Problem
A small business with several employees had been processing payroll through a basic system that wasn't properly handling payroll tax withholdings and filings. The owner received notices from the IRS and Illinois Department of Revenue about missing or incorrect quarterly payroll tax returns, creating stress and potential penalty exposure.
The Solution
David reviewed the payroll records, identified the filing gaps, prepared and filed the missing quarterly returns, and communicated directly with the IRS and IDOR to resolve the notices. He then transitioned the business to a compliant payroll processing system with proper tax filings handled automatically.
The Outcome
The IRS and state notices were resolved without significant penalties. The business now has a payroll system that handles tax withholdings, filings, and year-end W-2s correctly and on time. The owner has peace of mind knowing payroll compliance is handled by a CPA.
Services Used
S Corporation Tax Planning for a Growing Business
The Problem
A growing consulting firm had reached a revenue level where the sole proprietor/LLC structure was no longer tax-efficient. The owner was paying self-employment tax on all profits, had no clear retirement strategy, and was unsure whether an entity change made sense given the business's growth trajectory.
The Solution
David analyzed the business's financials, projected the tax impact of an S corp election, and walked the owner through the decision. He handled the election, established reasonable compensation in line with industry standards, set up a tax-efficient retirement plan, and created a year-round tax planning calendar.
The Outcome
The S corp election produced meaningful tax savings through reduced self-employment tax. The retirement plan provided both a tax deduction and a path to long-term wealth building. With a year-round planning calendar, the owner now receives proactive strategy adjustments rather than reactive tax filing.
A CPA Partner Who Invests in Your Success
Business owners choose DWK Tax & Accounting because they get direct access to a licensed CPA who understands their industry, their goals, and their numbers, not a revolving door of staff.
Licensed Illinois CPA
David Korzeniowski is a licensed Certified Public Accountant in the State of Illinois, not a seasonal tax preparer or a software dashboard. Every return is prepared and reviewed by a CPA who is accountable for accuracy and compliance.
Small Business Experience
8+ years working with contractors, restaurants, medical practices, law firms, e-commerce, real estate investors, and consultants across DuPage County. Industry-specific knowledge means better deductions and fewer surprises.
Year-Round Support
Tax strategy doesn't stop in April. David is available throughout the year for questions, planning conversations, and proactive adjustments, not just at filing season.
Proactive Tax Strategy
We plan ahead. Entity structure, timing, retirement contributions, and quarterly estimates are reviewed continuously so you keep more of what you earn, legally and strategically.
Personalized Planning
Every business is different. Recommendations are built around your specific circumstances, goals, and growth plans, never a generic template or a one-size-fits-all checklist.
Local & Accessible
Based in Wheaton, serving DuPage County and the western suburbs. You can call, email, or meet in person. No call centers, no overseas outsourcing, no account handoffs.