The European Commission’s Special Eurobarometer 498 (2019, n = 27,565 across all EU member states) found that while only 3.5% of respondents openly admitted to working undeclared in the prior year, re-analyses using list experiments and register data put actual participation at 10 to 20% in many member states. The documented consequences include the loss of social protection entitlements, pension rights, health coverage, and unemployment benefits — costs that emerge over years or decades rather than immediately. A 2021 academic re-analysis of the same Eurobarometer data (Williams & Oz-Yalaman) found participation is driven less by pure cost-benefit calculation than by a deficit of vertical trust in government and horizontal trust in others: 20% of participants acted for purely social-actor reasons, 19% for purely rational-economic reasons, 7% for exclusion-driven reasons, and 54% for mixed motives. On the inaction side, the European Labour Authority’s 2023 study estimated that undeclared work amounts to 11.1% of total labour input and 14.8% of private-sector gross value added in the EU (2019), creating unfair competition for fully declared workers and businesses in labour-intensive sectors such as construction, domestic services, and hospitality. No survey, however, asks compliant workers whether they regret their compliance.
The mechanism differs sharply between the two sides. Workers who chose undeclared arrangements often did so for immediate income gains, but the re-analysis suggests mixed and trust-driven motives dominate over pure rational tax evasion, and the costs become apparent only later through missing pension contributions, inability to claim unemployment benefits after job loss, and legal exposure that remains dormant until enforcement. The compliant worker’s cost is present and continuous: lower take-home pay, price competition with non-compliant operators, and the perception of being disadvantaged for following the rules. Country-level variation is enormous. In Romania and Bulgaria, envelope wages affect more than 20% of the workforce and declared workers face steeper competitive disadvantage than in Denmark or the Netherlands, where undeclared work affects fewer than 5% of workers.
Neither displayed rate measures regret directly. The 20% action-side figure is the share of undeclared-work participants with purely social-actor (trust-deficit) motives, not a survey question asking “do you regret working undeclared.” The 10% inaction-side figure is the share of EU consumers who bought goods or services they believed involved undeclared work — a proxy for the competitive market compliant workers face, not an expression of personal regret about choosing compliance. The true regret rates on both sides are unknown; both are likely to be higher than the proxies suggest because both sets of consequences are underreported — undeclared workers do not publicly discuss illegal activity, and declared workers in non-union environments rarely articulate economic disadvantage relative to less compliant neighbours. The Gilovich temporal model suggests that action regret (working undeclared) grows sharply at retirement or job loss when the pension and benefit gaps first become concrete, potentially decades after the original decision.