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Reviewed by: William McLee
Reviewed date:
January 16, 2026

What New York Form ST-809 (2020) Is For

New York Form ST-809 (2020) is used by businesses classified as part-quarterly filers to report monthly sales and use tax to the New York State Department of Taxation and Finance. This form applies to companies that exceed $300,000 in taxable sales during any quarter and are required to file more frequently than quarterly. It allows high-volume filers to report gross sales, taxable sales, exempt transactions, and use tax owed for a specific month, supporting more accurate NY sales tax reporting.

When You’d Use New York Form ST-809 (2020)

You are required to file this form when specific monthly or classification conditions apply:

  • Monthly filing status requirement: Businesses that exceed $300,000 in combined taxable sales and purchases subject to use tax during any calendar quarter must begin part-quarterly sales tax filing in the following quarter.

  • Motor fuel or diesel distributors: Any business that sells 100,000 gallons or more of motor fuel or diesel fuel in a quarter must file a monthly report, regardless of the dollar amount of sales.

  • No-tax-due returns: Even if you had no taxable sales during the reporting month, you are still required to file a return to comply with state sales tax filing laws.

  • Amended returns: You must file an amended Form ST-809 if you identify an error in a previously submitted return or if you need to claim a refund using Form AU-11.

  • Late returns: If you fail to file by the 20th of the following month, you must still file and will be subject to penalties and interest charges.

Key Rules or Details for 2020

Several rules and technical requirements apply specifically to the 2020 version of this form:

  • Filing threshold and classification: If your business exceeds $300,000 in taxable sales during a single quarter, you must file monthly starting the next quarter; if your sales remain below the threshold for four consecutive quarters, you may request reclassification to quarterly status.

  • Short method eligibility: You may use the short method to estimate tax due only if you have filed returns for all four quarters immediately before the current month.

  • Local tax rate variation: Because local jurisdictions impose different sales tax rates, you must track sales by locality even when filing monthly and apply the correct rate to each transaction.

  • E-file mandate: You are required to use the Sales Tax Web File system to file electronically if you have internet access, use a computer to prepare returns, or are subject to the corporation tax e-file mandate.

  • Motor fuel treatment: Prepaid sales tax on motor fuel or diesel fuel must be reported on Form FT-945/1045, while credits for such prepaid taxes can be claimed on New York Form ST-809 (2020).

Step-by-Step (High Level)

The following process outlines how to correctly complete and submit New York Form ST-809 (2020):

  1. Gather business records: Collect all monthly sales documentation, including gross sales, taxable sales, exempt sales, out-of-state purchases, and exemption certificates, as these are necessary to calculate your liability and maintain compliance.

  2. Choose calculation method: Decide whether to use the long process, which requires actual figures for the current month, or the short procedure, which estimates one-third of the prior year’s quarterly liability adjusted for local rate changes.

  3. Complete the correct section: Fill out Step 1 if using the long method by entering gross sales, taxable sales, and purchases subject to use tax; complete Step 2 if using the short method by referencing the prior-year quarter.

  4. Calculate penalties and interest if applicable: If your return is late or underpaid, calculate the penalty and interest using the department’s online calculator or assistance line and enter the result on the return.

  5. Submit payment and file your return: Determine the total amount due and submit your return electronically via the Sales Tax Web File system. If you qualify for a paper filing, mail it with payment to the address provided on the form.

Common Mistakes and How to Avoid Them

These are the most frequent errors filers make when submitting New York Form ST-809 (2020) and how to prevent them:

  • Including sales tax in gross sales figures: Report only the sale price before tax in your gross and taxable sales entries; never include the sales tax collected, as it should be calculated separately.

  • Submitting incomplete forms: Always submit all pages of the return and any required schedules, even if they are blank, to ensure complete processing and avoid rejection or delay.

  • Misreporting motor fuel tax: Do not include prepaid motor fuel or diesel fuel taxes on ST-809; instead, report them on Form FT-945/1045 and claim credits on ST-809 only for eligible retail use or business consumption.

  • Misusing the short method: Adjust the prior-year quarter’s tax amount based on local sales tax rate changes before dividing by three to avoid underpayment or overpayment.

  • Forgetting no-tax-due returns: You must still file a return even if no taxable sales occurred during the month; failure to do so results in the same minimum penalty as filing late with tax due.

  • Missing credit documentation: When claiming credits not linked to a specific locality, include supporting documents such as invoices, receipts, and a written explanation of how the credit was calculated.

What Happens After You File

After submitting New York Form ST-809 (2020), the New York State Department of Taxation and Finance processes your return and payment. If you used the Web File system and authorized electronic withdrawal, funds will be deducted within a few business days. If you paid by check, processing may take longer. You will receive confirmation of electronic filing, which should be saved along with your monthly records. 

FAQs

Do I need to file New York Form ST-809 (2020) every month?

Yes, as a monthly filer, you must file New York Form ST-809 (2020) for the first two months of every quarter, even if you had no taxable sales during the reporting period.

Can I return to quarterly filing after becoming a part-quarterly filer?

Yes, if your taxable sales remain below $300,000 for four consecutive quarters, you may request to switch from part-quarterly sales tax filing back to quarterly filing status.

What if I filed on time but made an error on my return?

You can file an amended New York Form ST-809 (2020) to correct any reporting error and, if applicable, submit Form AU-11 to claim a refund for overpaid tax.

Is state sales tax filing still required if I had no taxable activity?

Yes, New York State requires all monthly filers to submit a return even when there is no tax due, or else you may face a minimum penalty for failure to file.

How does New York sales tax reporting work if I sell in multiple counties?

You must apply the correct combined state and local rate to each sale and maintain detailed records by jurisdiction for accurate New York sales tax reporting and for completing the quarterly ST-810.

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