final income tax return; final declaration; final report
personal statement; verbal or informal, unsubstantiated assertion
under-reporting (e.g. income on a tax return)
return system; tax payment by self-assessment; declaration system
blue return; blue-paper income-tax return; type of income tax return filing which allows for special income deductions
undeclared income; unreported earnings; unreported income
(filing) revised (income tax) return
self-assessed tax payment
white return; white-paper income-tax return; type of income tax return filing which does not require maintaining accounting books
additional tax charged for not filing one's return on time