ILHeader-500-2 e-file error
This error occurs when the Illinois 1065 return tax period end date falls outside the date range or the tax period exceeds 53 weeks.
Error message
ILHeader-500-2: If FormILHEADER TaxPeriodEndDt is not between 12/25/25 and 12/25/26 or FormILHEADER TaxPeriodBeginDt to FormILHEADER TaxPeriodEndDt is greater than 53 weeks, you have filed an incorrect schema version.
Solution
- Go to .
- Make sure the tax period end date falls within the date range and that the total tax period isn't greater than 53 weeks.noteIf those conditions aren't met, you'll need to either change the date or paper file per the Illinois schema requirements.
- Do a full recompute, then recreate the e-file.
