The Illinois Department of Revenue Dec. 1 issued instructions for 2020 Form IL-1040-X, Amended Individual Income Tax Return. Taxpayers should file Form IL-1040-X to change a previously filed Individual Income Tax Return due to a change that affects items used to figure their Illinois net income or credits. Beginning with returns filed on or after June 25, if an amended return claiming a credit or refund is filed within six months of the expiration of the statute of limitations, then the statute of limitations will automatically be extended an additional six months for issuing an assessment of additional tax due. .
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