2026 年所得税计算器

FreeTaxUSA supports over 350 credits and deductions. Our free federal service includes basic, premium, and self-employed tax forms.

Maximum Refund Guarantee

We guarantee your maximum refund! If you get a larger refund or smaller tax liability with another online tax software, we'll refund your purchases. We'll also give you a service code for a free amended tax return.1

100% Calculation Accuracy Guarantee

If you pay penalties or interest to the IRS or your state of residence because of a calculation error, we'll pay you the penalties and interest. 2

Always Free Federal Guarantee

Your federal tax return and every supported federal form is 100% free. Whether you file a complex or simple federal return, we guarantee your federal return is always free.

Details

1. Maximum Refund Guarantee: If your refund is larger or your tax liability is smaller using a different tax filing method, we will refund any fees from using our service and provide you a service code for a free amended tax return. The refund (or liability) difference cannot be due to a difference in the data supplied, credits or deductions claimed, or other variation in preparation. Calculation errors in other methods and positions contrary to the law will not qualify as valid proof for larger refund amounts.
2. Accuracy Guarantee: FreeTaxUSA cannot and does not assume any liability, claim, or loss for any user generated errors. You are responsible for entering complete and accurate information into the Products and Services. FreeTaxUSA is not responsible for penalties, interest, or other amounts that result from inaccurate, incomplete, or untimely information you provide, or from your failure to follow on-screen prompts or requests for additional information. However, FreeTaxUSA does offer an Accuracy Guarantee that the tax formulas and calculations accessed via any of the Products and Services offered on the Site are accurate and will produce results consistent with federal and state standards for preparing and/or filing tax returns. In the event any of the formulas and/or calculations utilized in any of the Products and Services offered by FreeTaxUSA are incorrect, then FreeTaxUSA will reimburse you any penalties and/or interest imposed by the Internal Revenue Service and/or your state of residence to the extent that such are imposed as a result of any such erroneous formulas and/or calculations. The Accuracy Guarantee is limited to penalties and/or interests as stated in this section and to no other amount(s).

If you believe a calculation or formula error described above has occurred, you must notify FreeTaxUSA as soon as you become aware of the error, and in no event later than 45 days after the related interest or penalty is assessed. Notice must be sent via the Support Center from your authenticated account, or by email or by mail to the addresses listed below and must include reliable supporting documentation (for example, a copy of the applicable IRS or state notice and evidence of payment of the assessed penalty or interest).

Email: support@freetaxusa.com

FreeTaxUSA - Accuracy Guarantee
1255 S State St
Provo, UT 84606

FreeTaxUSA will then contact you to resolve the issue. In order to investigate your issue, FreeTaxUSA requires supporting information such as a copy of the IRS/state notice, evidence of payment of the specified penalty and/or interest, etc.