What happens if my platform's native tax settings and Kintsugi disagree?

Kintsugi remains the system of record for filing on every plan. For the specific reconciliation behavior on your platform, see that integration on help.trykintsugi.com.

Does Kintsugi handle usage-based and subscription billing?

Yes. The calculation engine handles subscriptions, usage-based pricing, credit notes, tax-only corrections, and tax-inclusive pricing, not just single flat-rate sales.

What if we charged the wrong tax on an invoice?

Fix the original invoice if you still can. If it's already paid or closed, issue a tax-only invoice or credit note for the difference and mark it tax-only in Kintsugi. Your liability moves by that amount in the period of the correction, and your gross sales, transaction counts, and exposure tracking stay as they were.

Can I calculate tax through an API instead of a connected platform?

Yes. Kintsugi's API and SDKs let you call real-time calculation directly from your own checkout, billing, or invoicing flow.

Does Kintsugi calculate use tax too, or just sales tax?

Both. Alongside sales tax, VAT, and GST on what you sell, Kintsugi calculates use tax on what you buy from out-of-state or under-taxed vendors.

Tax calculation with the right rate, every time

Once you're registered, Kintsugi calculates the sales tax, VAT, or GST owed on every transaction: the right rate, the right jurisdiction, and the right product. If you haven't registered yet, start with Registrations.

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Trusted by 7,000+ businesses

Factors to consider

Four inputs behind every tax calculation

Kintsugi combines the transaction’s address, the product’s tax code, where you have exposure, and where you’re registered to calculate the right tax. The same engine handles sales tax, VAT, and GST. On business sales between EU countries, it decides between reverse charge and local VAT from your customer’s VAT ID, where the sale ships from, and where you’re established.

AI Assisted

Not everything is taxable

Kintsugi Intelligence automatically helps you tag your products and services with the correct tax codes, since taxability rules (and rates) vary by category, not just by location. Review and approve classifications one at a time, in bulk, or from the mobile app before they apply to a live calculation. For a large catalog, export it to a workbook, edit categories and approvals, and import it back. Nothing changes until you confirm, and a later sync from your store or billing system won't overwrite a product you've edited or approved.

Modern Selling

For modern billing

Kintsugi's calculation logic is built to handle modern billing, not just a single flat-rate sale.

Subscriptions
Recurring invoices are calculated on the same engine as one-time sales, renewal after renewal.
Usage-based pricing
Metered and consumption billing recalculates as usage totals change, not just at checkout.
Credit notes
Refunds don't count as new sales. Tax-only corrections change your liability, not your sales totals.
Tax-inclusive pricing
Mark a VAT- or GST-inclusive price and Kintsugi backs the tax out instead of adding it on top.

On Every Sale

Real-time on invoices, reconciled where it's platform-native

Kintsugi is the system of record for filing, no matter which platform calculated the number. On invoices, Kintsugi's own engine can calculate the tax in real time, so it provides the number from the start.

Use Tax

Tax calculation runs both ways

Kintsugi also calculates use tax, the liability created when you buy from an out-of-state or under-taxed vendor. Purchases are kept separate from sales totals, and Kintsugi nets the tax owed against whatever the vendor already charged, so you're never shown a negative liability.
Full depth on Use Tax.

Guaranteed

Backed by a real guarantee

“If a calculation we made or a filing error of ours leads to penalties or interest, we pay it.”

That's the Kintsugi Guarantee, and it applies to the calculations this page describes, not just filings.

Your Stack

Calculate tax at checkout, from your stack

Building your own checkout, billing, or invoicing flow instead of using a connected platform? Kintsugi's API and SDKs let you call real-time calculation directly from Stripe, Shopify, Chargebee, or a custom stack, and embed it in days, not weeks.
Full depth on Developers.