Separate operating income tax, payroll, sales/use tax questions and real-estate taxes. A single “tax percentage” can conceal different taxpayers and obligations. Use this educational checklist with the CPA who prepares the business returns.

Identify the taxpayer before comparing rates
An LLC is a legal structure, not a complete federal tax classification. Ask the preparer how the entity files and how income reaches its owners. The IRS business-structures overview explains why the entity choice affects returns and tax treatment.
Record the operating entity, the owner of the real estate and any related-party lease. A property-holding company and an operating company can have different books and obligations. Keep their cash movements and expenses distinct when analyzing the wash’s earnings.
Check Illinois income and replacement taxes
The IDOR rate table lists 4.95% individual income tax and 7% corporate income tax. It separately lists replacement-tax rates of 2.5% for corporations other than S corporations and 1.5% for partnerships, trusts and S corporations. These categories do not determine the final tax for your facts.
Ask about Illinois additions/subtractions, apportionment, elections and credits rather than simply adding every listed percentage. Pass-through income and an entity-level obligation are different concepts. Do not use an old federal SALT cap or a brokerage example as an election recommendation.
Keep operating tax records in separate schedules
Organize income-tax payments, payroll withholding and employer costs, taxes collected from customers, equipment purchases and the county real-estate bill in separate accounts. A tax collected on behalf of government is not necessarily operating revenue or an owner’s expense.
Have the CPA examine invoice and register treatment for wash services, retail goods and mixed packages. Confirm current state and local requirements at the site. A service-versus-product classification depends on the activity and transaction; this page does not issue a sales-tax determination.
Model equipment purchases and leases independently
Federal depreciation can change tax timing without changing what the equipment cost. Ask the CPA to classify equipment, building improvements and land, and model Illinois treatment separately. Use Publication 946 for federal background, including placed-in-service requirements and deduction limits.
Review who pays property tax under the lease and whether it is included in the rent line. Counting both gross rent and a property-tax pass-through that is already inside it overstates expenses. A future sale can also create a recapture issue even when deductions helped earlier cash flow.
What to provide for a current-year review
Send the entity returns, current books, payroll filings, equipment invoices and placed-in-service dates, sales-tax setup, lease and property-tax bill. Ask for a written explanation of which obligations are owner-level, entity-level or collected from customers. Confirm the tax year and all elections before using the model to support an acquisition offer.
Sources & evidence
- IRS: business structures
Entity and tax classification; not a recommendation for a particular owner. - Illinois Department of Revenue: income tax rates
Illinois income and replacement tax rates; individual facts and modifications still matter. - IRS: Publication 946, depreciation
Federal depreciation rules; check the tax-year edition and effective dates.
Links checked for this editorial pass on October 14, 2026. General reference material does not establish a site’s revenue, value or eligibility. Examples are illustrative where labeled.
Continue your preparation
- Taxes when you sell an Illinois car wash
- Car wash asset sale or equity sale: define the transfer
- Car wash equipment: Section 179 and bonus depreciation
Explore an earnings and cash-flow scenario, then book a call to review your questions.
Discuss your next step
Share your wash format, county and whether you’re buying or selling. Detailed business records can follow through an agreed private process.
Book a confidential consultation ↗