I haven't had to take anything out of savings yet, but sometimes I overspend in one area, and underspend in another and it balances out. I'm still tweaking my budgets. This past couple of months I've had my parents' dog while they've been on holiday (still another month to go! ) And he's cost me £75 so far and it looks like I will need to take him to the vet tomorrow, so extra costs. My parents will reimburse me as they were keen that I shouldn't have to pay for him as he's not my dog, but that won't happen until they get back. For now it's coming out of my buffer fund.