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system
is my financial plan for buying a house logically sound
user
as a rental, this is not an ideal set of numbers. you manage to show a $255 'gain' but $275 is from payment to principal. so, from the start, you're out $20/wk.  this ignores the $170k down payment, which has an opportunity cost, however you calculate it. you can assign the same rate as the mortgage, and it's nearly $10k/yr. or the rate you feel your choice of stock market or alternate investment would rise. either way, you can't ignore this money.  your mortgage rate isn't fixed. a 1% rise and it would jump to $1663 ($842/week) ideally, a rental property is cash positive without counting principal paydown or even the tax refund. it's a risky proposition to buy and count on everything going right. i didn't mean to scare you off with "1%" but you should research the costs of repair and maintenance. last year my heat/ac system needed replacement. us$10k. this year, it's time to paint, and replace rotting trim, $7000.  in the us we have property tax that can range from 1-2% of the house value. if you don't have this tax, that's great, just please confirm this.
assistant