Tds payment

tds is deducted and deposited-account credited in the books or paid which ever is earlier. as u have received the bill in dec, u will account it for in dec while passing tds entries simultaneously & then will deposit the tds by 7th jan 

TDS should be deducted, either on credit or payment whichever is earlier. i.e if you book invoice first - tax should deduct tds

or

if you make payment first : tax should be deducted at this point 

Thank you