Having rollover is a defining aspect of envelope budgeting. I put aside $150/mo for house repairs. I may have multiple repairs a year, or go almost 2 years without repairs. Rollover makes it easy to make sense of this madness. Multiply this by M for M other categories where spending is not regular.

> But you can also change the dates of charges, so you can move stuff to next month or the previous month if there was room left over which I find convenient for spreading out big purchases.

I do not want to alter the actual record of charges - that would cause lots of other problems. And I don't want to manually babysit this. I want to be able to get a balance of my account with all the money set aside subtracted out (regardless of whether it was spent or not).

Envelope budgeting is an incredibly simple algorithm, and I find it quite disheartening that most open source financial software does not support it. YNAB has shown how helpful it is to many, many people. I think Ledger and hledger are the only open source applications I know where one can do this.