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A rainy day fund is money that is set aside for unexpected costs, like car repairs or a broken boiler.
How much you save will depend on your circumstances but you should aim to have three months' worth of essential outgoings in your account. This will give you a financial buffer to fall back on if you need it.
Use our calculator to find out how much you should save in your rainy day fund.
Please use the calculator as an estimate. It does not include interest you would earn over time.