VAT Declaration

Declarations, reliably and lightly.

Accurate and continuous support for VAT declarations associated with cross-border EC and overseas sales. We transform complicated practices into reliable operations.

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VAT declarations are a test of the accuracy of ongoing operations.

For overseas sales, it is essential not only to register but also to deal with VAT declarations on an ongoing basis. It is necessary to maintain an accurate declaration system while dealing with the differences in systems and deadlines in each country.

This is the best choice for people like you.

Companies that are already registered for VAT and need assistance with tax returns

Companies that are experiencing an increased declaration burden due to increased cross-border EC sales

Companies that wish to manage multiple country tax returns together

Companies wishing to reduce the burden on internal personnel

Companies wishing to prevent declaration errors and delays

Service Strengths

Experience in more than 170 countries


We have experience in VAT and sales tax registration in more than 170 countries around the world, including Europe, the UK, Asia, and the United States. Our network of local partners are well versed in the tax systems of each country, allowing you to complete registration without hesitation.

Strong in continuous operation


Not a one-off, but monthly/quarterly continuous reporting leads to stable operation.

Understanding EC Data


Assistance includes organizing sales data from Amazon, Shopify, etc.

Service Details

Our VAT declaration support services include confirmation of registration information for each country, organization of sales, returns, and delivery-related data for the applicable period, confirmation of necessary vouchers, preparation and submission of the declaration, and management of the payment schedule. In cross-border e-commerce, the information required for tax reporting, such as platform data, company website sales, returns, and inventory movements, can easily be scattered, making the accuracy of practical operations critical. We organize the flow from data collection to declaration operation, and build a system that continuously rotates. If necessary, we can also consult with you on registration reviews and extensions to support other countries.

Frequently Asked Questions

Category Title

Q.

Can I request just one country?

A.

Yes, even from one country.

Q.

Do you support the reporting of Amazon sales?

A.

Yes, we are willing to We can handle the liquidation including platform sales.

Q.

Can you also manage my filing deadlines?

A.

Possible. We can also assist with scheduling if needed.

Q.

Can I still consult with you even if I have undeclared past tax returns?

A.

After confirming the situation, we will inform you of our response policy.

Q.

Can we also discuss payment methods?

A.

Yes, we can provide consultation on the payment practices and necessary procedures. We can consult with you on payment practices and necessary procedures.

Flow up to the start of service

  • 01

    Contact us
    Please feel free to contact us first.
    Our dedicated staff will listen to your company's situation.

  • 02

    Check current status
    Check country of registration, frequency of filing, and sales status.

  • 03

    Document Preparation Required Materials

    Organize sales data and vouchers.

  • 04

    Declaration Preparation
    We will compile your declaration in accordance with the requirements of each country.

  • 05

    Submission and Payment Assistance
    Advances deadline management and submission practices.

Why choose OPTi?

OPTi Corporation is a specialized international indirect tax firm, providing VAT, sales tax, and GST registration and filing services in more than 170 countries around the world.
We have extensive experience in Europe, the UK, and Asia, and support a wide range of clients from major corporations to cross-border e-commerce businesses.
With our global network of local partners and the latest tax system knowledge, we can certainly support your global business from a tax perspective.

Start with OPTI

For cross-border e-commerce tax matters, contact Opti

We provide cost-effective and efficient solutions for complex international indirect taxes (VAT, sales tax, GST).