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Form 1040-ES, Estimated Tax for Individuals (PDF)
Figure and pay your estimated tax on income that is not subject to withholding (for example, earnings from self-employment, interest, dividends, rents, alimony, etc.)
Related: Instructions for Form 1040-ES (PDF)
Form IT-540-ES Estimated Tax Voucher for Individuals
Figure and pay your estimated tax on income that is not subject to withholding (for example, earnings from self-employment, interest, dividends, rents, alimony, etc.)
Form W-4, Employee’s Withholding Allowance Certificate (PDF)
Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Consider completing a new Form W-4 each year and when your personal or financial situation changes.
Related: Withholding Calculator
Form W-9, Request for Taxpayer Identification Number (TIN) and Certification (PDF)
Provide your correct SSN or other TIN to the person who is required to file an information return with the IRS to report, for example, income paid to you, real estate transactions, mortgage interest you paid, acquisition or abandonment of secured property, cancellation of debt, or contributions you made to an IRA.
Related: Instructions for the Requestor of Form W-9 (PDF)
Publication 15 (Circular E), Employer’s Tax Guide (PDF)
Explains your tax responsibilities as an employer. It also includes tax tables that you need to figure the taxes to withhold from each employee.
Related: Read Pub 15 Online
Publication 17, Your Federal Income Tax (PDF)
Explains the general rules for filing a federal income tax return. It supplements the information contained in your tax form instruction booklet. It explains the tax law to make sure you pay only the tax you owe and no more.
Related: Read Pub 17 Online