Turkish International Ship Registry (TUGS): 2026 Tax Guide

For an international shipowner, the choice of flag is never merely administrative. It shapes your tax exposure, your financing costs, the way you crew the vessel, and how easily the ship can be bought, mortgaged, or sold. The Turkish International Ship Registry (TUGS) has quietly become one of the most tax-efficient flags in the Eastern Mediterranean, granting a full exemption from corporate and income tax on shipping earnings under Law No. 4490. If you are an owner, financier, or operator deciding where to register a vessel in 2026, this guide explains how the Turkish International Ship Registry works, who qualifies, what it costs, and how our Istanbul maritime lawyers run the process from the first eligibility check to the registration of the ship mortgage.

Key Takeaways: What You Need to Know

• Two registries, one flag. Turkey maintains the National Ship Registry (Milli Gemi Sicili) and the Turkish International Ship Registry (TUGS); both grant the right to fly the Turkish flag, but only TUGS carries the tax advantages of Law No. 4490.

• Tax-free shipping income. Earnings from operating and from selling a TUGS-registered ship or yacht are exempt from Turkish income and corporate tax under Article 12 of Law No. 4490.

• Cheaper crewing. Wages paid to seafarers on TUGS vessels are exempt from income tax, with no nationality requirement for the crew.

• Low-friction transactions. Sale, mortgage, charter, and ship-finance contracts for TUGS vessels are exempt from stamp duty, official fees, and the banking and insurance transactions tax (BSMV).

• Open to foreign owners. A foreign-owned vessel can fly the Turkish flag through the TUGS bareboat (demise) charter route, without transferring ownership.

What Is the Turkish International Ship Registry (TUGS)?

The Turkish International Ship Registry was created by Law No. 4490, which entered into force in 1999, to give Turkey a competitive "second registry" alongside its traditional national registry. The aim was straightforward: keep Turkish-controlled tonnage under the Turkish flag, and attract foreign tonnage, by removing the tax burden that pushes owners toward open registries. TUGS is administered by the Directorate General of Maritime Affairs (Denizcilik Genel Müdürlüğü) under the Ministry of Transport and Infrastructure, and is operated through the principal port registries, including Istanbul.

Under Article 940 of the Turkish Commercial Code (TCC), a ship owned by Turkish nationals carries the Turkish flag, and the flag is evidenced by entry in a Turkish ship registry. TUGS sits on top of that framework as a special-law regime: the ship enjoys full Turkish nationality and flag-state protection, while the owner accesses fiscal incentives that the ordinary registry does not offer. In practice, this makes the Turkish flag behave less like a flag of convenience and more like the national "international registries" used by Norway, Denmark, and Germany.

TUGS vs the National Ship Registry (Milli Gemi Sicili)

The distinction matters because it drives both tax treatment and operational scope. The National Ship Registry is the default register for Turkish-flagged commercial vessels and remains relevant for purely domestic operators. TUGS is the register of choice for owners trading internationally who want the Law No. 4490 tax package. Both registers permit cabotage — the carriage of goods and passengers between Turkish ports — which is reserved to the Turkish flag under the Cabotage Law No. 815 of 1926.

The Tax Benefits of Registering a Ship in Turkey (Law No. 4490)

The commercial heart of TUGS is Article 12 of Law No. 4490, which bundles three exemptions that, taken together, can transform a vessel's economics.

Corporate and Income Tax Exemption

Income derived from operating a TUGS-registered ship or yacht — and, critically, income from its sale or transfer — is exempt from Turkish income and corporate tax, as well as from the funds levied on those taxes. For a profitable vessel, this turns the Turkish flag into a near-zero-tax operating base. The exemption on sale proceeds is just as important for asset-play owners: a vessel bought, operated, and later sold under TUGS can be disposed of without a Turkish corporate-tax charge on the gain.

Seafarer Wage Tax Exemption

Wages paid to the masters, officers, and ratings serving on TUGS vessels are exempt from income tax. There is no nationality condition, so an owner can crew the ship with the most cost-effective mix of nationalities without losing the exemption. Across a full crew over a year, this is a material saving that flows straight to the operating margin.

Stamp Duty and Transaction Exemptions

Article 12 also removes the transactional friction that makes ship deals expensive elsewhere. Purchase, sale, mortgage, registration, credit, and charter (freight) contracts relating to a TUGS vessel are exempt from stamp duty, official fees, and the banking and insurance transactions tax (BSMV). For financiers this is decisive: a ship mortgage securing acquisition finance can be registered without the stamp-duty cost that would otherwise attach to the secured amount, which is why ship-finance lenders are comfortable taking Turkish-flag security.

Practical Scenario. Suppose a European group operates a 25,000 GT bulk carrier in international trade. By incorporating a Turkish company, transferring the vessel to it, and registering the ship in TUGS, the group's operating profit on that vessel falls outside Turkish corporate tax, the crew's wages are exempt from income tax, and the mortgage securing the bank's acquisition loan is registered free of stamp duty. When the vessel is sold three years later, the gain is not subject to Turkish corporate tax. The exact outcome depends on the group's wider structure and tax residence elsewhere, but the Turkish-flag layer itself is tax-neutral.