Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

Should I fund a move by borrowing or selling other property assets?
It depends what rate mortgage you can get for any extra loans...  If you remortgage you are likely to get a rate of 3.5-4%... depending who you go with. With deposit accounts in the UK maying around 1% (yes, you can get more by tying it up for longer but not a huge amount more) clearly you're better off not having a mortgage rather than money in the bank. Does your 8k income allow for tax? If it does, you are getting 6% return on the money tied up in the flat. If you are getting 6% after tax on the invested money, that's way better than you would get on any left over cash paid into an investment. Borrowing money on a mortgage would cost you less than 6%... so you are better off borrowing rather than selling the flat. If you are getting 6% before tax... depending on your tax rate... it probably makes very little difference. You'd need to work out how much an extra 80k mortgage would cost you, how much the 50k on deposit would earn you and how much you make after tax. There is a different route. Set up a mortgage on the rental flat. You can claim the interest payment off the flat's income... reduce your tax bill so the effective mortgage rate on the flat would be less than what you could get with a mortgage on the new house. Use the money from the flat's mortgage to finance the difference in house price. In fact from a tax view, you may be better off having a mortgage free house and maxing out the mortgage on the flat so you can write off as much as possible against your tax bill. All of the above assume ... that the flat is rented all the time. The odd dry spell on the flat could influence the sums a lot. All of the above assume that  your cash flow works whichever route you choose. As no-one on stack exchange has all of the numbers for your specific circumstances it may be worth talking to a tax accountant. They could advise you properly, knowing the numbers, which makes the best sense for you in terms of overall cost, cash flow, risk and so on.