What the settlement is
(required − served) × monthly ÷ divisor − leave × monthly ÷ divisor
Competitors often run that on CTC. CTC includes PF, gratuity accrual, and insurance the company never recovers. Type Basic or gross — whichever the clause names. If the letter is silent, ask HR which number they put in the F&F worksheet before you accept their debit.
Leave is the usual offset. Some handbooks only allow privilege leave, not sick leave. Type the days they will actually encash. A negative net means they owe you; that credit is still salary in the year you receive it.