Is SaaS taxable in Kentucky? A developer's guide to the state's flat 6% rate and HB 8

Kentucky SaaS sales tax at a glance

Product Taxability Rules

State Registration & Collection Triggers

Which types of software does Kentucky tax?

Kentucky taxes software based on what it is, not how the customer receives it.

Bundles and mixed invoices are where implementations break. Apply taxability per line item, not per order: a custom-development charge billed on its own line stays exempt even on an invoice that also includes a taxable SaaS subscription.

Under Kentucky law, unseparated bundled transactions containing taxable and exempt products/services are entirely taxable.

How do you charge the correct sales tax rate for SaaS in Kentucky?

Multiply by a flat 6% and you have the rate. Kentucky has no local sales taxes, so unlike a state with address-level variance, rate math here is simple. The real complexity is classification: custom development, digital property, and bundled charges don't all follow the same rule as a standard SaaS subscription, and getting that wrong is where implementations break.

Option 1: Use the Ziptax Sales Tax API

You send the buyer's Kentucky address at checkout, and the API returns the applicable rate and the product-level taxability determination together, so you don't have to maintain your own lookup table for which line items are taxed as prewritten-computer-software-access services versus custom development, digital property, or a bundled charge.

To calculate a live rate and taxability determination against a Kentucky address, use the v60 endpoint:

Bash

curl -G https://api.zip-tax.com/request/v60 \
    -H "X-API-KEY: <apiKey>" \
    -d key=your-api-key \
    --data-urlencode "address=400 W Market St, Louisville, KY, 40202"

To verify complete payload structures, explore the REST API documentation.

Three things to do with that response:

1. Apply the returned rate directly: for Kentucky it will consistently resolve to the flat 6% state rate, since there's no local sales tax to add on top.
2. Match the response's product classification rather than assuming every software line item is taxed the same way; review Taxability Information Codes (TICs) to see how SaaS, custom development, and digital property are each flagged.
3. Store the effective date on the transaction, because Kentucky's own SaaS rule has an effective date, January 1, 2023, that matters if you ever need to reconstruct how an older invoice should have been taxed.

If your contract lets a customer resell access to your product, Kentucky allows that resale leg to go untaxed when the reseller presents a valid resale certificate; manage exemption certificates rather than tracking them in a spreadsheet.

What an API will not tell you: your company's physical presence or economic registration status in Kentucky. Tracking whether you have crossed a nexus threshold and must legally register remains on your side of the integration.

To automate threshold tracking, tax filings, and remittance, you can use Ziptax Merchant Tools to connect TaxCloud automated compliance for your own business or for sub-merchants building on your platform; set up merchant management once you're ready to onboard additional states or sub-merchants.

Option 2: Build and maintain it yourself

A real choice if you already hold classification data for other reasons. Kentucky removes the hardest part of most states' build-it-yourself problem—address-level rate resolution—but still leaves you four things to handle:

1. Product and service classification. A SaaS subscription, a custom-development charge, a digital audio or e-book sale, and a bundled hardware-plus-software package can all appear on the same invoice, and each follows a different statutory rule.
2. Threshold accumulation on the right basis. $100,000 in gross receipts delivered into Kentucky, counted on a current-or-previous calendar year basis, and combining direct sales with anything sold through a marketplace facilitator.
3. A resale path for B2B. Separately stated custom programming and consulting stay exempt when billed apart from any taxable software charge, and the service itself can be purchased for resale when a reseller presents a valid certificate.
4. Effective dates. Kentucky's SaaS taxability began January 1, 2023. A system built or reused from before that date needs to reflect the change.

Four things to watch out for:

1. Don't assume "no local tax" means "no complexity." Kentucky's 2022 reform added more than a dozen newly taxable service categories, and 2026's HB 757 further expanded the base to include "data brokering services" effective August 1, 2026. A generic "software is taxable" rule will misclassify a data-service or digital-property line item that falls outside the statute's narrower definitions.
2. Digital audio-visual works are treated differently from digital audio works. Kentucky's digital property statute expressly excludes streamed video from the categories it taxes, while digital audio, digital books, and video or electronic games are taxed; a single "digital content" bucket will over-collect tax.
3. Watch the gross-receipts count, not a transaction count. Kentucky repealed its 200-transaction nexus test effective August 1, 2026; the trigger is now $100,000 in gross receipts only, so don't build threshold logic around a transaction count that no longer applies.
4. The custom-software exemption turns on the invoice. Software built to a specific customer's specifications falls outside Kentucky's "prewritten computer software" definition entirely, but keep that charge on a separate line from any licensed or subscription product. Under Kentucky's bundled transaction statutes, an unseparated bundle poisons the invoice and taxes the entire charge.

When does a SaaS business have to collect sales tax in Kentucky?

You must register and start collecting once you cross $100,000 in gross receipts into Kentucky, or once you have a physical presence there, whichever comes first.

Registration and taxability are separate questions, though, and Kentucky's answer to the registration question changed recently.

Rule 1: Monitor your registration triggers (nexus)

You must legally register to view collection requirements and nexus and file with the state the moment either of these conditions is met:

• Physical presence: an office, employees, inventory, or other property in Kentucky.
• Economic threshold: your gross receipts from tangible personal property, digital property, and services delivered to Kentucky customers exceed $100,000 in the current or previous calendar year. Kentucky repealed its separate 200-transaction count test effective August 1, 2026, so transaction volume alone no longer creates nexus. Marketplace-facilitated sales count toward this threshold alongside your direct sales.

Rule 2: Apply the correct classification once you're registered

SaaS access has been taxable since January 1, 2023, so once you have nexus, you charge the 6% rate at checkout immediately; there's no interim zero-collection stage like a state with a future effective date.

What varies line-by-line is classification, not timing. A taxable SaaS subscription, an exempt custom-development charge, and a bundled hardware-plus-software package can sit on the same invoice and need to be taxed differently.

Where Ziptax helps

Ziptax handles the infrastructure layer of sales tax calculation so your team can focus on your core product.

• Product-Level Accuracy: Resolves taxability by product classification, not a blanket "software is taxable" assumption, so a SaaS subscription, custom development, and digital property are each flagged correctly, including nuances like Kentucky's audio-taxable-but-audio-visual-excluded digital property rule.
• Engineered for Platforms: Built specifically to embed live tax calculations directly into checkout workflows, API endpoints, and marketplace billing frameworks.
• Frictionless Pricing: Designed for cost-conscious development teams who want to pay strictly for active calculation calls. View Ziptax pricing.
• The TaxCloud Runway: When your transaction volume scales, you can pair Ziptax with TaxCloud for the rest of compliance, including Kentucky, where TaxCloud's status as a Streamlined Sales Tax Certified Service Provider applies directly.

Get Kentucky SaaS tax rates from an API

Ziptax Sales Tax API rates for Kentucky, plus the rest of the US, Canada, and select other markets.

Frequently asked questions

Does Kentucky tax SaaS differently depending on how it's delivered? 

No. Kentucky's "prewritten computer software" definition doesn't turn on delivery method: remotely accessed SaaS, electronically downloaded software, and software on physical media are all taxable at the same 6% rate.

Is custom software taxable in Kentucky? 

No, if it's genuinely built to a specific customer's specifications and separately stated on the invoice. Keep custom-development and consulting charges on their own invoice line, since an unseparated bundle definitively renders the entire charge taxable under Kentucky law.

Does Kentucky have local sales taxes to account for? 

No. Kentucky is one of the few states with no local-option sales tax, so the 6% state rate is the total rate everywhere in the state. There's no address-level jurisdiction mapping needed for rate purposes, though product classification still varies by what's being sold.

Sources

1. SaaS Taxability & Imposition: KRS § 139.010 (Definitions) and KRS § 139.200 (Imposition of sales tax), as amended by 2022 Kentucky House Bill 8.
2. Digital Property Definitions & Audio-Visual Exclusion: KRS § 139.010(12) (Digital property inclusions and digital audio-visual exclusions).
3. Economic Nexus Threshold & Repeal of Transaction Prong: KRS § 139.340 (Retailer's duty to collect tax), as amended by 2026 Kentucky House Bill 757.
4. Marketplace Facilitator Compliance: 2019 Kentucky House Bill 354; Kentucky Department of Revenue, Remote Retailers and Marketplace Providers FAQs.
5. Sourcing Rules for Remote Software & Services: KRS § 139.105 (Sourcing of retail sales) and Kentucky Department of Revenue, Sourcing Guidelines.
6. Resale & Exemption Administration: KRS § 139.260 (Presumption of taxability and resale certificates).
7. Bundled Transactions & De Minimis Rules: KRS § 139.010 (Bundled transaction definitions and taxability).
8. Streamlined Sales Tax Agreement Status: Streamlined Sales Tax Governing Board (Kentucky State Details).