That would be simply illegal in Spain, I think.
I'm sure that it still happens. Throughout the 1980s there was a fairly well documented practice of allowing workers on the dole to do casual work on the side and no lose benefits in Andalucia. And I'll give my consent to any government that does not deny a man a living wage-Billy Bragg
Nowadays the underground economy is much smaller.
Preg. Senor, quiere Ud. una factura para su compra, si le doy se necesita pagar el IVA.
Resp. No, yo la tenga toda necesito.
Sure, the underground economy is smaller, because it's harder to keep track of. And I'll give my consent to any government that does not deny a man a living wage-Billy Bragg
I'm not saying it doesn't happen