Newbie me again, I've got an extra $200/month coming my way...

[Helen Fradette]

So a window opened and I have an extra $200/month that I had not accounted for coming in each month and I'm deciding what to do with it.  I can either put it in my employee retirement account which is not maxed out yet - (btw do I have to personally make sure I don't over fund this each year or is there some kind of monitoring going on?) -  or I can pay an extra $200 to the principal of my home mortgage or put it in my Tax Advantage account.  The mortgage calculator has me saving $5000 in interest over the life of my loan... 13 years left; vs $200/month invested at 10% return for 13 years is around $3120.  So it would be better to pay it towards my home mortgage, right?- Provided that I'm going to live in this home until it is paid off?  If I'm going to sell it in the next 5-7 years, does that make a difference? I don't know what I'm going to do with it yet.