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Learn about the types of federal business taxes.

Find out if you need an employer identification number (EIN). Get one online, free from the IRS. Don¡¯t pay for an EIN.

Through its Joint Statistical Research Program (JSRP), Statistics of Income (SOI) seeks to enable the use of tax microdata by qualified researchers outside the federal government.

We're auditing your tax return and need documentation to verify the income and withholding you reported. This may affect your eligibility for the Earned Income Credit (EIC), dependents, and other refundable credits you claimed. We¡¯re holding your refund pending the results of the audit.

Calculate, pay or remove the underpayment of estimated tax by corporations penalty when you don¡¯t pay estimated tax accurately or on time.

We have important information about your child¡¯s Adoption Taxpayer Identification Number (ATIN). Your child¡¯s ATIN expired.

We have important information about your child's adoption taxpayer identification number (ATIN). We approved your request for a one-year extension.

Do you earn income as a rideshare driver, rental host or online seller? Find forms, keep records, deduct expenses and file taxes for gig work.

Important information about your child's adoption taxpayer identification number (ATIN). We assigned your child an ATIN.

We have important information about your child¡¯s adoption taxpayer identification number (ATIN). The extension for your child¡¯s ATIN expires in 3 months.