You don't use all your assets as a collateral – you loan out, say, 1%, for the needs you have. If the creditor demands a repayment for some reason – and if you're still solvent, it's not like your IOU can't be treated as money in itself – then you can get a loan on some other 1% of your now-appreciated assets, use that to repay the first loan. All without liquidating any assets and accruing any “income”. Then pass the bucket to whoever inherits your assets.