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This document provides instructions for corporations to amend a previously filed California Corporation Franchise or Income Tax Return, claim refunds, and inform the Franchise Tax Board of changes
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How to fill out Form 100X

01
Obtain Form 100X from the official website or designated office.
02
Fill out your personal information at the top of the form, including your name, address, and tax identification number.
03
Indicate the tax year for which you are filing the amended return.
04
Complete the sections that require you to report the changes from your original return.
05
Include any necessary supporting documentation that justifies the changes you are making.
06
Review the form for accuracy and completeness.
07
Sign and date the form to certify that the information provided is true and correct.
08
Submit the completed Form 100X to the appropriate tax authority as instructed.

Who needs Form 100X?

01
Individuals or entities who need to amend their previously filed tax returns due to errors or updates.
02
Taxpayers who want to claim additional deductions or credits that were missed in the original filing.
03
Anyone who needs to correct their filing status, income, or any other relevant tax information.
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People Also Ask about

What Is CA Form 100? The California Corporation Franchise or Income Tax Return serves as a tax document for corporations functioning in California. Its purpose is to declare income, compute tax liability, and meet tax responsibilities to the state.
Form 100 California Corporation Franchise or Income Tax Return is the regular return for CA corporations. Form 100W California Corporation Franchise or Income Tax Return--Water's-Edge Filers can be filed by combined groups that meet the requirements.
Purpose. Use Form 100X to amend a previously filed Form 100, Form 100S, or Form 100W. A claim for refund of an overpayment of tax should be made by filing Form 100X.
Who is Required to File Form 100 ? Corporations organized in California or doing business in the state must file Form 100. This includes California-based corporations and out-of-state corporations conducting business within California.
General Information. Form 100S is used if a corporation has elected to be a small business corporation (S corporation). All federal S corporations subject to California laws must file Form 100S and pay the greater of the minimum franchise tax or the 1.5% income or franchise tax.
Use Form 100-ES to figure and pay estimated tax for a corporation. Estimated tax is the amount of tax the corporation expects to owe for the taxable year.

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Form 100X is an amended corporate income tax return used by corporations in California to correct errors on a previously filed Form 100, California Corporation Franchise or Income Tax Return.
Any corporation that has previously filed Form 100 and needs to make corrections or amendments to that return, such as changes in income, deductions, or credits, is required to file Form 100X.
To fill out Form 100X, a corporation needs to complete the form by providing the correct information and attaching a copy of the original Form 100, along with any supporting documents for the changes being made. It should be filed with the California Franchise Tax Board.
The purpose of Form 100X is to provide corporations with a mechanism to amend their original tax returns to ensure accurate reporting and compliance with California tax laws.
Form 100X must include the corporation's name, address, federal employer identification number, the tax year for which the amendment is being filed, the original amounts reported, the corrected amounts, and a detailed explanation of the changes being made.
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