Professional Services & Consultants Bookkeeping in Illinois

Whether professional services & consultants services are taxable in Illinois is the question that catches people out — states differ enormously, and several have been broadening what counts. Retailers’ Occupation Tax sourcing rules differ for in-state versus remote sellers, and Chicago layers several of its own taxes on top. We code service revenue separately from any product revenue so the treatment is explicit rather than assumed.

Economic nexus in Illinois is $100,000 in sales or 200 transactions. For professional services & consultants, that threshold is the one to watch, because it is reached by selling into the state — no office, no staff, no physical presence required. Once you cross it you are expected to register with the Illinois Department of Revenue and begin collecting. We track your Illinois sales against it and tell you before you cross, not after.

Registering to do business in Illinois runs through the Illinois Secretary of State, with tax accounts through the Illinois Department of Revenue and employer accounts through the Illinois Department of Employment Security. Illinois treats these as wholly independent, so being in good standing with one says nothing about the others — and the sales tax account is the one that accrues a real balance while you are not looking.

The Illinois statewide base rate is 6.25%. Local rates stack on top and are generally sourced to the delivery address, so the effective rate varies within the state. Getting sourcing right is what keeps the liability account matching what you actually collected.