"planning on taking" is a valid phrase in written English.
Generally, it is used to express when you are intending on doing something. Example: I'm planning on taking a vacation in the fall.
Plenty of people do not, but if one or both partners are planning on taking a new surname on marriage, you need to let everyone know.
If you're planning on taking the plunge in purchasing one of the new devices and are thereby unloading your old iPhone, Gazelle has a deal for you.
An indoor place is more suitable than an outdoor one, but if you're planning on taking more outdoor shots, then that's a fine place to set it.
If you're planning on taking a trip in the wilderness make sure that you have one of these.
"Are you planning on taking a bus?
After that, she is planning on taking a vacation.
Paton: I'm not planning on taking over the world at all, but these businesses will scale.
NYT: Are you planning on taking over the world or just saving a couple of newspapers?
I was planning on taking my time, but then I had a child.
I wasn't planning on taking the subway anymore, at least during peak hours.
I wasn't planning on taking photographs of Belfast, but I felt like I needed to.
