Glossary/Tax Concepts/Flat Tax
Tax Concepts

Flat Tax

Flat Tax is a tax system that applies a single uniform rate to all taxable income, without progressive brackets and often with limited deductions.

What Flat Tax is

A flat tax applies a single statutory rate to all taxable income above a basic allowance. It contrasts with progressive systems, where the marginal rate rises with income. Flat-tax systems can apply to corporate income, personal income, or both.

Estonia (20%, but applied to distributed profits only), Romania (10% personal, 16% corporate), Bulgaria (10%), Hungary (15% personal), and Russia historically (13%) are well-known examples.

Variants

  • Pure flat tax: one rate, broad base, limited deductions
  • Distributed-profits flat tax: Estonia's model - corporate tax is paid only when profits are distributed, encouraging reinvestment
  • Flat regimes for non-domiciled or new residents: Italy's EUR 100,000-200,000 lump sum, Greece's alternative regime, Switzerland's cantonal lump-sum tax

Trade-offs

Proponents argue flat taxes simplify compliance, reduce distortions, and attract capital and talent. Critics highlight reduced progressivity and revenue concerns.

From a founder's perspective, jurisdictions with attractive flat-tax regimes (Estonia for retained earnings, Italy and Greece for high-net-worth relocation) are popular structuring tools, particularly when combined with strong treaty networks and EU access.

When you will meet Flat Tax

You will hear about flat taxes when comparing personal-residency options for founders relocating across the EU, when considering Estonia for an operating or holding entity (especially during high-growth retained-earnings phases), or when evaluating low-rate jurisdictions like Bulgaria or Romania for a back-office or shared-service company.

Where this comes up in our guides

Flat Tax FAQ

No. Estonia applies a 20% corporate tax, but only on distributed profits. Retained and reinvested profits are not taxed at the corporate level until distribution.
At a glance
Category
Tax Concepts
Confirm current figures with the official registry or a qualified adviser before relying on them.
Related terms
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Sources
  1. 1Tax Foundation - Flat Tax Overview
  2. 2Estonian Tax and Customs Board - Corporate Income Tax
Definition reviewed March 2026.
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