Last reviewed: 2025-10-17
Use Tax Form 943a: as a stand alone tax form calculator to quickly calculate specific amounts for your 2026 tax return. Alternatively you can use one of our Combined Federal and State Tax Estimator to quickly calculate your salary, tax and take home pay.
What this does: Form 943a records your liability by pay date (federal income tax withheld plus both shares of Social Security and Medicare). If you are, or became, a semiweekly schedule depositor, you must attach this with Form 943 or 943-X.
How to use: Enter the liability for each day wages were paid. The calculator totals each month (A–L) automatically. Show liabilities here—not deposits.
Tips: Leave days with no liability blank. Use whole dollars or cents; monthly totals round to two decimals. If your monthly liability never reached the semiweekly threshold and you stayed monthly all year, Form 943a is generally not required.
| You must complete this form if you are required to deposit on a semiweekly schedule or if your tax liability during any month was $100,000 or more. Show tax liability here, not deposits. (The IRS gets deposit data from electronic funds transfers.) DO NOT change your tax liability by adjustments reported on any Forms 943-X. | |||||||||||
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Check before filing: Ensure monthly totals (A–L) equal the annual liability reported on Form 943 (after adjustments). Keep this schedule with your records.
Last reviewed: 2025-10-17: If you believe this form requires an update, please contact us.
References: See the latest IRS Instructions for Form 943-A and About Form 943-A for who must file and examples.
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