Texas Sales Tax Filing Guide — 2026

Most states assign a filing cadence when you register, based on your expected tax liability: monthly for high-volume sellers ($50K+ tax liability/year), quarterly for mid-volume, and annually for low-volume. Texas may reassign your frequency if your liability changes materially.

Even if you had zero taxable sales in Texas during a period, you must file a zero return. Missing filings trigger penalties regardless of tax owed. Most automated tax services will file zero returns for you by default.

Texas's filing due dates are typically the 20th of the month following the period end (with variations). Late filing penalties are usually 5%/month up to 25%; late payment adds interest. Register for the state's auto-pay or use a service that remits on your behalf to avoid late fees.

• Skipping a zero return in a slow month — most penalty exposure comes from missed filings, not unpaid tax.
• Waiting until due date to file; Texas's portal can time out on volume days. File at least 48 hours early.
• Not keeping exemption certificates on file — if you're audited and can't produce a valid certificate for a tax-exempt sale, that sale becomes taxable and you owe the uncollected tax.

Texas sales tax nexus and SaaS taxability: economic nexus applies to remote sellers with $500,000 or more in total Texas revenue during the preceding twelve calendar months. After crossing that safe harbor, Texas requires a permit and sales/use tax collection no later than the first day of the fourth month after the threshold-crossing month. Texas treats data processing as a taxable service and the Comptroller says data processing providers include software-as-a-service sellers and application service providers; 20% of a data-processing charge is exempt, so SaaS treated as data processing is generally taxed on 80% of the invoice amount. Marketplace-only sellers whose marketplace provider certifies Texas collection generally do not need a Texas tax permit, but sellers must keep marketplace-sales records for at least four years.

Read the full Texas overview for thresholds, filing frequency, marketplace facilitator rules, and registration links. Use the nexus calculator to check whether you have crossed the threshold. For background on the post-Wayfair economic nexus framework, see the pillar guide.

• Texas · Thresholds
  Economic and transaction nexus thresholds
• Texas · E-commerce
  General e-commerce sales tax rules
• Texas · Marketplace Facilitator
  Marketplace facilitator law for the state