The only closing costs that I can think of that are currently deductible is accrued interest paid and prepaid property taxes...but this shouldn't be a reason to push up or push back closing.

I’m asking because of this excerpt from the California Landlord Law Book: Do not include in a three-day notice any rent that accrued prior to your having properly noti ed the tenant in writing of your new ownership interest andother required information.

Jay Hinrichs , I see people talk about paying above UPB, occasionally, but I have to assume they mean just the Principle Balance, without the other 20-40% in accruing interest, fees, costs, insurance, taxes, etc.

Instead with the HELOC, the funds just sat there accruing no interest until we were ready to close on the place we ended up buying.

Interest accrued on a HELOC and fixed rate mortgage is calculated the same and is based on the outstanding balance and interest rate.

Depending on your state, you need to know the date the deposit was received to accurately calculate accrued interest.

So, having never been a homeowner before, I'm wondering aside from the down payment, what are the other costs accrued in the home buying process?

The ~$145k in interest payments ($475k-$330k) is accrued over a 30 year period, and is not created on day 1 of your mortgage schedule.Note that you will still have a hefty interest accrual over a 5 year period.

Others will be a balloon after X months, in which case you'll have to pay it off along with the accrued interest.

You dont want them to accrue interest and late fees etc...