What's the difference between agency and FIE in Estonia?
An agency or umbrella structure withholds exactly like a permanent employee: flat 22% income tax above the EUR 8,400 basic exemption, plus 1.6% employee unemployment insurance, after the agency's fee comes off the top. A FIE (füüsilisest isikust ettevõtja, sole proprietor) pays the same 22% income tax on profit above the basic exemption, but also pays the 33% social tax (sotsiaalmaks) directly, normally an employer-only cost for a regular employee, never deducted from their net pay. For a FIE there's no separate employer, so this cost falls on the same person. On a EUR 350/day rate over 218 billable days, agency retains about 75.2% of contract revenue as net take-home, while FIE retains about 46.0%.