The Miranda actor said that he is looking to concentrate on spending time with his family following the birth of third child Marnie.
Wife Tamzin Outhwaite gave birth to their second child in August, having already raised 4-year-old Florence. He is also a father to 7-year-old Nora from a previous relationship.
"Marnie is great. She has just started smiling," he told The Sun.
"We are very happy and enjoying every minute. For the time being I'm not sure what I am doing next year.
"But I am looking forward to putting all my energy into being a dad and filming Miranda."
Ellis explained that his latest role in BBC One's The Secret of Crickley Hall left him feeling drained, as it sees him playing a father whose son goes missing.
"At the heart of the piece is this family going through a very tragic time, so it was something that I really fancied doing," he said.
"But I didn't realise how much it would affect me. Because I was constantly playing out a scenario that was a real-life nightmare for any parent, I came home from filming with a really heavy heart."
Tom Ellis will appear in Miranda on BBC One later this year.
The Secret of Crickley Hall premieres on Sunday, November 18 on BBC One.