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

What the New York Form ST-100 (2019) Is For

New York Form ST-100 (2019) is the quarterly sales and use tax return that registered vendors use to report taxable sales, nontaxable sales, and purchases subject to use tax in New York State. The form summarizes business activity for a three-month filing period and calculates the total state and local sales tax due.

This sales and use tax return also requires jurisdiction-level reporting because local tax rates vary by county, city, and special district. Vendors use the form to remit collected tax, apply approved credits, and meet New York sales tax filing requirements.

When You’d Use New York Form ST-100

Businesses use New York Form ST-100 (2019) when they are assigned a quarterly filing status for sales tax purposes. Most newly registered vendors start as quarterly filers, unless they qualify for annual filing or are required to file monthly due to their sales volume.

The form is also used when filing a late quarterly sales tax return or submitting a final return after closing or selling a business. Vendors must file even when no taxable sales occurred during the quarter to avoid penalties.

Key Rules or Details for 2019

For 2019, quarterly sales tax returns were due within 20 days after the end of each filing period. Filing deadlines applied regardless of whether tax was owed, and failure to file triggered penalties, even for returns with no tax due.

Most vendors were required to file electronically using the New York Sales Tax Web File System. Vendors who filed and paid on time could claim a vendor collection credit equal to five percent of the tax due, subject to the quarterly maximum.

Step-by-Step (High Level)

Step 1: Prepare records

Gather quarterly sales and purchase records, including invoices, exemption certificates, and returned merchandise support. Accurate records are crucial because reported amounts can be compared to third-party payment data.

Step 2: Report sales and purchases

Review gross sales and separate taxable transactions from exempt or nontaxable sales. These totals drive the remaining calculations on the return.

Step 3: Allocate by jurisdiction

Report taxable sales and purchases subject to use tax by jurisdiction based on where the item was delivered or used. Do not allocate based only on the business location.

Step 4: Calculate tax due

Apply the correct jurisdiction tax rate to each taxable amount using the jurisdiction codes and rates required for Form ST-100 (2019). Confirm the rates used match the filing period.

Step 5: Apply credits, then submit and pay

Apply approved credits only when prior approval and supporting documentation exist. Finalize the total due after any credits, penalties, or interest, then file (electronically or by mail if permitted) and submit payment by the deadline.

Common Mistakes and How to Avoid Them

  • Using the wrong form for the assigned filing frequency: Use Form ST-100 for quarterly filing, and use the correct New York sales tax form assigned for monthly or annual filing.

  • Reporting sales under the wrong jurisdiction: Report sales based on the delivery location or place of use, and support the jurisdiction with shipping and service records.

  • Making calculation errors on a paper return: File online to validate entries and rely on automatic calculations to reduce math and carryover mistakes.

  • Claiming credits without approval or support: Submit the required credit application and attach supporting documentation before claiming credits on the return.

  • Missing filing deadlines even when no tax is owed: File a return for every assigned quarter by the due date, including zero-activity periods, to avoid automatic penalties.

What Happens After You File

The Department of Taxation and Finance processes the return and puts the payment into the vendor's account after it is filed. People who file electronically get an immediate confirmation of acceptance.

To confirm accuracy, reported numbers may be compared to data from third parties. The Department may request additional information if disparities are identified.

Returns remain subject to audit for several years. Vendors must retain records that support all reported sales, purchases, and exemptions.

FAQs

Who was required to file New York Form ST-100 (2019)?

Any business registered to collect New York sales tax and assigned a quarterly filing status was required to file this return, even if there were no taxable sales during the quarter.

What were the 2019 quarterly filing deadlines?

Quarterly returns were due 20 days after the end of each filing period, typically in May, August, November, and March.

Could vendors file New York sales tax online in 2019?

Yes, most businesses were required to file New York sales tax online using the state’s electronic filing system.

What happens if a quarterly sales tax return is filed late?

Late filing results in penalties and renders the vendor ineligible for the vendor collection credit. Interest continues to accrue until payment is made.

How are amended sales tax filings handled?

Errors discovered after filing are corrected through a separate credit or refund application. Approved credits may be applied to a future return.

Is filing required if there were no sales?

Yes, vendors must file a no-tax-due quarterly sales tax return to remain compliant and avoid penalties.

Can filing frequency change after 2019?

Yes, filing frequency can change based on sales volume, but changes apply prospectively after notification from the Department.

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