Is it obligatory to slaughter on the days of Tashriq or is it permissible to slaughter after these days?

The opinion of Hanafi, Maliki, and Hanbali scholars is that it is impermissible to slaughter an animal due to hajj tamattu' (performing ‘umrah before hajj) or qiran (performing hajj and ‘umrah simultaneously) except on the days of slaughter i.e. the day of 'Eid and the three following days. However, according to the Shafi'is, the obligatory sacrifice due to committing one of the restrictions of ihram (state of pilgrim sanctity) or omitting an integral is not restricted to a particular time. It is permissible to slaughter on day of sacrifice or on any other day.

The ruling
It is necessary to slaughter the sacrificial animal during the days of hajj (the day of 'Eid and the three following days).

And God Almighty knows best.