20k for 180k property means you need a 90% LTV mortgage. That will give you the worst interest rates. If you can save a 25% deposit you'll get a better interest rate. It all comes down to how comfortable you are with whatever interest rate is offered to you.
Although this is true I've found that it doesn't make a HUGE difference and the higher interest rate would only be for the introductory period of the mortgage before reverting back to the banks standard rate. Granted after that period you'll still have a lower LTV which means that you'll probably be able to negotiate another fixed rate if you were so inclined.
What me and my partner are trying to do is get onto the market borrowing much less than we could afford with the intention of making overpayments on the mortgage to decrease our LTV. This also has the benefit of being less at risk when interest rates rise as we wouldn't be in a situation where we are not able to pay the mortgage.
Last edited: