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Is there a good rule of thumb for how much I should have set aside as emergency cash?
We aim to keep 6 months of expenses. The rationale is that its enough time to recover from most serious illnesses (that you can recover from) or a redundancy or pay for a large unexpected problem not covered by the insurance (e.g. the boiler dying). It also gives us enough time to reorganise finances if needed. For example we could get out of contracts (like mobile phones, sky TV), sell the car, and maybe even find a cheaper house if needed in that time. It will take a good chunk of time to build up that amount and it's worth considering how many commitments you have (kids, wife, mortgage, car...) as the fewer you have the less you need. If you have fewer commitments you can be comfortable with much less contingency. When I lived in rented accomodation and didn't run a car or have many possessions, I just maintained enough cash to cover my bills for about 6 weeks, this would give me enough time to find another job, and if I didn't get one I could always crash round a friend's house.