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Form library · 12 guides

IRS forms, explained.

Every IRS form has a purpose, a deadline, and a trap. These are the forms tax-resolution clients face most — written by attorneys who file them every week.

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Form 433-D

Installment Agreement

The form the IRS sends to formalize an installment agreement (monthly payment plan) on back taxes.

For: Any taxpayer — individual…Read
Form 433-A

Collection Information Statement for Wage Earners and Self-Employed

Detailed financial disclosure the IRS uses to decide what you can pay — required for most large installment agreements and Offers in Compromise.

For: Wage earners…Read
Form 433-F

Collection Information Statement (Short Form)

Shorter financial disclosure used by the IRS Automated Collection System for moderate balances.

For: Taxpayers in ACS collections — usually…Read
Form 656

Offer in Compromise

The form used to formally propose settling your IRS tax debt for less than the full amount owed.

For: Taxpayers with significant federal tax…Read
Form 9465

Installment Agreement Request

The form used to formally request an IRS payment plan when you can't pay your tax in full.

For: Taxpayers who cannot pay their federal…Read
Form 3921

Exercise of an Incentive Stock Option (ISO)

Reports the exercise of incentive stock options — drives Alternative Minimum Tax (AMT) calculation.

For: Employees who exercised incentive stoc…Read
Form 1040-X

Amended U.S. Individual Income Tax Return

Used to correct errors on a previously filed Form 1040 — claim missed deductions, fix income, or respond to an IRS adjustment.

For: Any individual taxpayer whose previous…Read
Form 2848

Power of Attorney and Declaration of Representative

Authorizes a licensed attorney, CPA, or enrolled agent to represent you before the IRS — speak, sign, and negotiate on your behalf.

For: Any taxpayer who wants a licensed repr…Read
Form 8821

Tax Information Authorization

Authorizes a third party (lender, accountant, attorney) to receive and inspect your IRS tax information — without representation rights.

For: Taxpayers applying for mortgages…Read
Form 4868

Application for Automatic Extension of Time to File

Buys you six extra months to FILE your individual return — but does not extend the time to PAY what you owe.

For: Any individual taxpayer who needs more…Read
Form W-4

Employee's Withholding Certificate

Tells your employer how much federal income tax to withhold from each paycheck — the single biggest lever for avoiding underpayment penalties.

For: Every W-2 employee — at hire…Read
Form 1099-NEC

Nonemployee Compensation

Reports payments of $600 or more to independent contractors — and is the IRS's primary tool for catching unreported 1099 income.

For: Any trade or business (including sole …Read

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