Building on the $20,000 number above, remember that your emergency fund doesn't have to all be immediately available. In other words, you could put $10k into a hysa, and the remaining $10k in a CD paying a bit more. In a real emergency, if you needed more than the $10k in savings, you could cash out the CD. You'd lose a bit of interest, but your principle is still there. It could be a 'laddered' emergency fund as it's not likely you'd need the FULL amount all at once.
To the OP - if you don't know what your pension amount will be, and you don't know what you spend now, how do you have any idea of whether your pensions will support your spending in retirement? I don't agree that you will just adjust your spending to match what you're bringing in, especially if what you bring in (your pension income) won't cover your basic expenses. You HAVE to have some idea of what your spending floor is, and what your pensions will cover. If you need a minimum of $4k/month to meet your obligations today, and your pensions will be $3500, you need to feel confident that you've saved enough to cover the remaining $500 every month for the remainder of your life. And as to not being able to predict what you'll need...you need to TRY. You can roll the dice and 'hope' you'll be good, or you can do the best to plan, including setting aside money for unexpected expenses, and have a bit more confidence that you'll be able to have a comfortable retirement. There is nothing like having a cushion to fall back on in a difficult situation. In our family, we've always said that savings gives you options....
To the OP - if you don't know what your pension amount will be, and you don't know what you spend now, how do you have any idea of whether your pensions will support your spending in retirement? I don't agree that you will just adjust your spending to match what you're bringing in, especially if what you bring in (your pension income) won't cover your basic expenses. You HAVE to have some idea of what your spending floor is, and what your pensions will cover. If you need a minimum of $4k/month to meet your obligations today, and your pensions will be $3500, you need to feel confident that you've saved enough to cover the remaining $500 every month for the remainder of your life. And as to not being able to predict what you'll need...you need to TRY. You can roll the dice and 'hope' you'll be good, or you can do the best to plan, including setting aside money for unexpected expenses, and have a bit more confidence that you'll be able to have a comfortable retirement. There is nothing like having a cushion to fall back on in a difficult situation. In our family, we've always said that savings gives you options....