Section 7(1)(a) in The West Bengal Premises Tenancy Act, 1997
(a)On a [suit] [Word substituted for the word 'proceeding' by W.B. Act 12 of 2006.] being instituted by the landlord for eviction on any of the grounds referred to in section 6, the tenant shall, subject to the provisions of sub-section (2) of this section, pay to the landlord or deposit with [the Civil Judge] [Words 'or the Civil Judge' first inserted by W.B. Act 6 of 2005, then, the words within third brackets substituted for the words 'the Controller or the Civil Judge' by W.B. Act 12 of 2006.] all arrears of rent, calculated at the rate at which it was last paid and upto the end of the month previous to that in which the payment is made together with interest at the rate of ten per cent per annum.