Terms for subject Labor law containing основа

Russian	English
занятый на договорной основе	entered into an employment contract (Alex_Odeychuk)
на сдельной основе	on a fee for services basis (alyonka1182)
работать на контрактной основе	work on a contract basis (Alex_Odeychuk)
работник, занятый на договорной основе	employee with an employment contract (Alex_Odeychuk)
учёт на основе метода начисления	accrual basis accounting (Yeldar Azanbayev)