# 5 Sales Tax Ecommerce Mistakes To Avoid During Black Friday & Cyber Monday Sales

Canonical: https://trykintsugi.com/blog/bfcm-ecommerce-sales-tax-mistakes
Published: 2025-10-24

Avoid common BFCM sales tax mistakes involving bundles, nexus, shipping, digital products, and exemption certificates.

Black Friday and Cyber Monday can turn a sales dashboard into a compliance challenge. Flash deals, new customers, and orders crossing state lines create conditions where ecommerce and SaaS businesses can misapply tax rules.

## 1. Misclassifying promotions or bundled products

Discounts, bundles, and “buy one, get one” promotions can receive different tax treatment by state. A bundle containing taxable software and a separately exempt service may need proportional allocation in one state and be taxed as a single transaction in another.

Taxing the pre-discount price when a state requires tax on the final price can also cause over- or under-collection. Configure the tax engine for each promotion and run test transactions before the holiday rush.

## 2. Missing newly triggered nexus

A surge can push sales or transaction counts over a state’s economic nexus threshold. If the business does not monitor sales by state in real time, it may miss the need to register, collect, and remit.

After BFCM, review orders by state. If a threshold was crossed without collection, determine the exposure, register where required, correct the shortfall, and remit before penalties grow.

## 3. Forgetting tax on shipping

Shipping rules vary widely. Some states tax shipping when the underlying product is taxable; others apply different rules when shipping is separately stated or the cart contains mixed products. “Free shipping” does not automatically mean there is no tax consequence.

Review shipping rules in high-volume states and test taxable, nontaxable, mixed, and free-shipping scenarios before launch.

## 4. Overlooking SaaS or digital-product taxability

States treat digital downloads, streaming, software, and SaaS differently. Some tax digital products as tangible personal property, while others exempt them or apply tax only in specific circumstances.

Map the taxability of every digital product, subscription, and bundle by state. Use current product tax codes and destination rules, then audit holiday orders for missed collection.

## 5. Failing to manage exemption certificates

Peak sales periods can cause teams to accept an exemption certificate without storing, validating, or tracking its expiration. During an audit, missing documentation can turn a legitimate exempt sale into an uncollected tax liability.

Capture certificates at checkout when possible, alert teams about missing or expiring documents, and store records in an audit-ready system rather than scattered spreadsheets.

## How Kintsugi helps

Kintsugi helps businesses prepare for BFCM by applying state-specific rules to discounts and bundles, monitoring nexus, calculating shipping tax, classifying digital products, and managing exemption certificates.

Ecommerce and SaaS businesses can test promotions in advance, monitor exposure during the rush, and review transaction records afterward. Automation keeps seasonal growth from becoming a year-round compliance problem.