Do you have a reserve fund?

I have calculated what I need for an "income fund" - this is the value I would enter in the Portfolio field of apps like https://ficalc.app/ - this is the money I would let generate my monthly income. But it occurs to me that this doesn't leave me anything for treats/emergencies/topping up income fund. Is it common practice to have a "reserve fund" along side the income fund? if so, what proportion of the income fund would generally be considered a safe amount?

submitted by /u/paulydee76
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