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Tax Exempt Certificates for OpenCart 2.3, 3.x and 4.x — sales tax exemption certificates with shop approval
Certificates in the account Certificates in the account (2) Certificate review Certificate review (2)
OpenCart

Tax Exempt Certificates for OpenCart 2.3, 3.x and 4.x — sales tax exemption certificates with shop approval

The buyer uploads a certificate, the shop reviews it, and tax goes away only on an approved, valid document for the delivery state. Encrypted file storage and expiry reminders. Not tax advice. Lifetime Pro licence.

Download fromOpenCart
Pro · lifetime licence Staging copies are included. The more sites, the cheaper each one
Compatibility
OpenCart 4.0.2.x and 4.1.x (tested on 4.0.2.3 and 4.1.0.3), 3.0.x (tested on 3.0.5.0), 2.3.0.2 · PHP 7.0+ · admin language: English
Version
v1.0.1 (OpenCart 4)
v1.0.0 (OpenCart 3.x)
v1.0.0 (OpenCart 2.3)
Licence
a site + a staging copy, lifetime
Trial
7 days, no card, one per site
Updated
01.11.2026
Or all 396 Pro modules with All Access — 4 990 ₴ / year ≈ €98

What Free has,
and what Pro adds

The free version works with no time limit. Pro adds the rest of the features in the table.

Feature Free Pro
Certificate upload by the buyer ✔ ✔
Shop review and expiry date ✔ ✔
Tax comes off only with an approved, valid certificate for the delivery state ✔ ✔
Encrypted file storage ✔ ✔
A record on the order ✔ ✔
E-mails about decisions and new certificates ✔ ✔
A note in the cart, at checkout and in the account ✔ ✔
Action log ✔ ✔
E-mail reminders before and after expiry — ✔
One certificate for several states — ✔
Add a certificate as a manager — ✔
CSV of certificates and exempt orders — ✔

What it looks like

Certificates in the account
Certificates in the account (2)
Buyer account: a certificate waiting for review.
Certificate review

Key points

What the buyer sees

In the account the buyer uploads a certificate with type, state and expiry. Cart and checkout show the state: waiting for review, applied, or not valid for this state.

What the admin gets

The admin sees the queue, opens the file, sets the expiry and approves or rejects.

How much it costs

The base version is free. Pro costs 1 290 UAH, a one-time payment for a lifetime licence.

The trial starts when you ask

A fresh install is the free version, nothing switches on by itself. The “Try Pro for 7 days” button → e-mail → the key right in the window and by e-mail.

One key — a site and a staging copy

Moving the site? Unlink the licence on the old domain and activate it on the new one yourself. A staging copy (staging., dev.) works with the same key and does not take a site slot. For studios — keys for 5 or 25 sites, or unlimited.

Technical requirements

  • OpenCart 4.0.2.x and 4.1.x, 3.0.x or 2.3.0.2 · PHP 7.0+.
  • OpenCart taxes and US zones set up.

Version history

v1.0.1 OC 4.x Current 01.11.2026

Before updating to this version, note the settings and the licence key, or replace the files over FTP without uninstalling: later updates keep them.

v1.0.0 First release November 2026

For OpenCart 4.x, 3.x and 2.3: upload, review, tax removal, encrypted storage.

Frequently bought with Tax Exempt Certificates

All Access Need more? All modules (396) under one licence, new ones are added automatically. 4 990 ₴≈ €98 Learn more →

Full module description

Tax Exempt Certificates keeps sales tax exemption certificates in OpenCart. The buyer uploads a document, the shop reviews it, and tax goes away only when the certificate is approved, valid and covers the delivery state.

This is not tax advice. The plugin stores documents and applies your decisions. It does not check permits with any state.

What the buyer sees

In the account the buyer uploads a certificate with type, state and expiry. Cart and checkout show the state: waiting for review, applied, or not valid for this state.

What the admin gets

The admin sees the queue, opens the file, sets the expiry and approves or rejects. A certificate approved for several states in Pro keeps working after Pro ends.

How it works, step by step

  1. The buyer uploads a certificate.
  2. The shop gets an e-mail and reviews the document.
  3. The buyer gets the decision.
  4. At cart and checkout the module checks status, expiry and delivery state.
  5. When a certificate expires, tax returns.

Under the hood

  • Files are stored encrypted.
  • The module does not check permits with states.

How to install

  1. Extensions → Installer: upload the archive for your version and keep the file name.
  2. OpenCart 2.3: the Installer copies files only with FTP enabled. Without FTP copy the contents of upload/ to the shop root by hand.
  3. OpenCart 2.3 and 3.x: Extensions → Modifications → Refresh.
  4. Extensions → Modules → Tax Exempt Certificates → install button → Edit.
  5. Test as a buyer: upload a file, approve it and walk through checkout.
  6. For Pro: paste the key or start the 7-day trial.

Questions
about the module

Didn't find the answer? Message us on Telegram and we'll reply within a business day.

@catcode_support Setup, compatibility, activation
Does the plugin check a certificate with the state?

No. You decide, and the plugin only applies the decision.

What if a certificate expires?

Tax returns at the next recalculation.

Is there one for WooCommerce?

Yes, it is a separate plugin.

Not quite what you are looking for?

We build custom modules for WordPress, WooCommerce, OpenCart and Shopify. Tell us about the task and we'll prepare an estimate.

Order a custom module