A foreign-owned firm needs to defend exactly which share of its income sits under the 20% tax rate and which under Zakat. The question is the same for a large group and for a smaller foreign investor.

The ownership split matters more than almost anything else in a Saudi tax position. In a joint venture that is 60% Saudi-owned and 40% foreign-owned, a blended rate does not apply. A Zakat base is calculated on the Saudi-owned portion and a separate corporate income tax liability on the foreign-owned portion, using different rules for each. The same financial statements can therefore produce two quite different calculations depending on how the ownership percentages are applied.

Who pays corporate income tax

Foreign ownership in a company, a branch of a foreign company operating in Saudi Arabia, and a non-resident with a taxable presence in the Kingdom fall under corporate income tax for the relevant portion instead of Zakat. This can include foreign engineering and contracting firms that set up a branch to bid on infrastructure or industrial projects, and international trading companies operating through a local entity.

Withholding tax as the other half of the picture

Payments to non-resident parties, such as management fees, royalties, technical services and interest, generally trigger withholding tax obligations at rates that vary by payment type. This is an area ZATCA examines when companies pay foreign parents or contractors for cross-border services.

Permanent establishment risk for foreign companies

A foreign company doing enough business locally, including through a project site or a long-term services contract, can create a taxable presence even without formally registering a branch. That brings corporate income tax exposure the company may not have planned for, so it is worth assessing before a long-term project commitment and not after.

Transfer pricing on related-party payments

Where a Saudi entity pays a foreign parent or affiliate for management fees, technical support or shared services, ZATCA expects that pricing to be justified on an arm's length basis. Documentation is best prepared before the return is filed and not assembled after a query. This is a distinct exercise from the tax calculation, covered under transfer pricing documentation.

A hypothetical example

Consider a foreign engineering firm that wins a local contract and sets up a project office instead of a formal branch to keep things simple, assuming its tax exposure is limited to what it invoices directly. Whether its sustained presence creates a permanent establishment is a question to settle before signing the contract.

Why timing matters before signing a contract

Once a project is underway, restructuring to manage tax exposure is far more limited than planning ahead. Reviewing the likely tax treatment of a Saudi engagement as part of the contract negotiation lets you address exposure while options remain open.