Use these official IRS and state resources to download common forms, estimate your withholding, and run quick tax calculations. All links open in a new tab.
IRS Forms & Calculators
Common Federal Tax Forms
Form W-4 (2025)
Used by employees to set federal tax withholding with their employer.
Form W-9
Used by businesses to request the taxpayer identification number (TIN) of contractors or vendors.
Form 1040 and Instructions
Standard individual income tax return and instructions.
Form 8829
Used to calculate the business use of home deduction for self-employed taxpayers.
Form 4562
Used to claim depreciation and Section 179 deductions for business assets.
Form 1041
Used to file fiduciary income tax returns for estates and trusts.
Form 1120-S
Used by S Corporations to report income, deductions, and shareholder information.
Form 1065
Used by partnerships to report income, deductions, and allocations to partners.
Form 4868
Used by individuals to request an automatic 6-month extension to file their return.
Form 7004
Used by businesses to request an extension of time to file their return.
Tip: Always download forms directly from the official IRS or state websites to ensure you’re using the latest version.
IRS Calculators & Estimators
IRS Withholding Estimator
Helps employees adjust W-4 withholding to avoid large refunds or balances due.
Self-Employment Tax Calculator
Estimate self-employment tax based on your net income.
Earned Income Tax Credit Assistant
Determines eligibility for the Earned Income Tax Credit (EITC).
IRS Interactive Tax Assistant
Answers common tax questions and helps determine if income, expenses, or credits apply to you.
IRS Tax Brackets and Rates
View the latest marginal tax rates for individuals and businesses.
State Forms & Calculators
Oregon Department of Revenue Forms & Publications
Oregon DOR Forms Page – Access Oregon income tax forms, CAT forms, and payment vouchers.
Washington Department of Revenue Tax Rate Lookup
Washington DOR Lookup Tool – Find B&O and sales tax rates by city or zip code.