An agency or umbrella employs you. After its monthly fee, it has to pay 33% social tax and 0.8% employer unemployment insurance on top of your salary, and both come out of the rate the client pays, so your gross salary is roughly the remaining revenue divided by 1.338. That salary then takes the flat 22% income tax above the EUR 8,400 basic exemption and 1.6% employee unemployment insurance, which is deducted before tax.
A FIE (füüsilisest isikust ettevõtja, sole proprietor) pays the social tax personally. The Estonian Tax and Customs Board (EMTA) sets the FIE social tax base at profit divided by 1.33, so the 33% rate works out to about 24.8% of profit, and that social tax is deducted before the 22% income tax. The base has a statutory minimum (EUR 10,632 for 2026), so even a FIE with modest profit owes social tax on at least that floor rather than scaling to zero.
Because both routes carry the same social tax, full-year FIE and agency take-home usually land within a percentage point or two of revenue, with the FIE slightly ahead before expenses and the agency fee widening that gap. The picture flips in a low-income year, when the FIE's minimum social tax base bites and an agency only pays social tax on what it actually pays you.
The permanent-equivalent-salary figure works backwards from your net take-home: what gross salaried pay, taxed the same flat-22%-plus-unemployment-insurance way, would produce the same net income. Useful as an anchor when comparing a FIE or agency contract against a permanent role.