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

What the New York Form ST-809 (2018) Is For

New York Form ST-809 (2018) is used by high-volume businesses to report and pay monthly sales and use tax to the New York State Department of Taxation and Finance. It captures taxable sales, collected tax, and any purchases subject to use tax for a single month. This sales tax return NY requires for part-quarterly filers ensures timely tax remittance while enabling the state to monitor compliance more frequently than with quarterly filings.

When You’d Use New York Form ST-809 (2018)

Businesses use New York Form ST-809 (2018) under specific high-volume circumstances or regulatory triggers:

  • High taxable sales or use tax purchases: If your total taxable sales and purchases subject to use tax reach $300,000 or more during any calendar quarter, you must begin filing monthly returns instead of filing a NY quarterly sales tax return.

  • Motor or diesel fuel distributors: If you sell 100,000 gallons or more of motor or diesel fuel in a calendar quarter, you are automatically required to file monthly using Form ST-809.

  • Mandatory status change by the state: You cannot opt in or out of monthly filing at will; the state will reclassify you as a monthly filer and notify you once the threshold is met.

  • Late or amended return situations: You must still file Form ST-809 even if you have no taxable sales or need to correct a prior month's report, and you may owe penalties or interest if filed late.

Key Rules or Details for 2018

Monthly filers need to follow several important rules for proper sales tax compliance:

  1. Dual filing requirement: Even though Form ST-809 is filed monthly, you must also submit Form ST-810 at the end of each quarter to reconcile monthly payments and report sales by locality.

  2. Calculation method restrictions: You may only use the short method if you have filed complete sales tax returns for the previous four quarters; otherwise, the long process is required.

  3. Mandatory electronic filing: If you prepare your own returns, use a computer, and have internet access, you must file electronically using the Sales Tax Web File system.

  4. Recordkeeping obligations: You are required to retain detailed sales and purchase records for a minimum of three years to support your filings and prepare for potential audits.

Step-by-Step (High Level)

Filing New York Form ST-809 (2018) involves a structured process that ensures accurate monthly reporting:

  1. Choose your calculation method: Decide between the long process (actual sales) or the short method (estimated based on last year's same-quarter tax), depending on your eligibility and filing history.

  2. Complete either the long method or the short method: For the long process, report total sales, taxable sales, use-taxable purchases, and applicable credits; for the short method, estimate one-third of the prior year’s quarterly tax and adjust for local rate changes and prepaid credits.

  3. Calculate penalty and interest if applicable: If filing late or submitting partial payment, use the online Penalty and Interest Calculator or call the Department of Taxation to compute the correct charges.

  4. Determine total tax due and payment amount: Add penalties and interest (if any) to your net tax owing, and complete the relevant boxes showing how much you are paying with the return.

  5. Sign and authorize the return: The taxpayer or an authorized officer must sign the form, include contact details, and optionally designate a third party to discuss the return with the Tax Department.

  6. File and submit payment: If you are required to file, submit electronically through your Business Online Services account; otherwise, mail the completed return and payment to the appropriate address.

Common Mistakes and How to Avoid Them

To stay compliant and avoid unnecessary penalties, businesses should be aware of these common errors and how to prevent them:

  • Including motor fuel sales in gross sales: You should not report motor or diesel fuel sales on New York Form ST-809 (2018) if those transactions are subject to prepaid tax; instead, claim the appropriate credit in the designated box to avoid overstating your taxable sales.

  • Failing to file no-tax-due returns on time: Always file Form ST-809 by the deadline, even if you made no taxable sales that month; otherwise, you will be charged a $50 minimum penalty for late filing.

  • Claiming credits without proper documentation: You must retain and submit detailed written explanations, jurisdictional data, and receipts for each credit claimed to prevent disallowance during audit or review.

  • Mixing up short method local rate adjustments: When using the short method, ensure you calculate and apply adjustments for any local tax rate changes to avoid underpayment or overpayment.

  • Forgetting the quarterly reconciliation: In addition to filing three monthly ST-809 returns each quarter, you must also file Form ST-810 to reconcile payments and report sales by locality; skipping this step results in compliance gaps and possible notices.

What Happens After You File

Once your New York Form ST-809 (2018) is filed, the Department of Taxation and Finance processes the return and applies your payment to your account. Electronic filings receive immediate confirmation, while paper submissions may take several weeks. You can view your return and payment status by logging into your Business Online Services account. If the department finds discrepancies or errors, they may contact you for clarification. 

Keep all records and return copies for at least three years in case of audit, and address any notices promptly to avoid estimated assessments or penalties.

FAQs

What’s the difference between monthly and quarterly filers in New York?

Monthly filers must submit New York Form ST-809 (2018) every month and file a quarterly Form ST-810, while quarterly filers only submit a NY quarterly sales tax return once every three months.

Can I still file using paper forms instead of e-filing?

You may file by mail only if you do not meet the electronic filing criteria required under New York’s sales tax compliance rules.

How do I decide whether to use the short method or the long method?

You may only use the short method if you filed complete returns for the past four quarters; otherwise, the long method must be used for accurate reporting.

What happens if I miss the monthly filing deadline?

Missing the due date results in automatic penalties and interest, even if no sales tax was due for that filing period.

Is monthly filing required even if my New York sales tax return shows zero tax due?

Yes, you are required to file New York Form ST-809 (2018) every month, regardless of whether you collected sales tax or not.

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