The method
Last revised Mar. 7, 2026, at the annual re‑set.
This is the whole system. It is not original, it is not clever, and it took us about four months to stop fighting it. We are writing it down mostly so that the monthly issues do not have to keep explaining themselves.
Why twelve
Because we tried twenty‑six and could not keep them in our heads. The first version of this budget had an envelope for coffee, an envelope for books, and an envelope for the hardware store, and by the third week of any month neither of us could tell you what was in any of them without opening the spreadsheet. Twelve is the number where we can both recite the list from memory, and being able to recite the list is what makes the system work in the aisle rather than at the desk.
Categories that could not survive the cut got folded upward. Coffee is groceries. Books are personal. The hardware store is household unless it is for the car, in which case it is the car.
It is not actually cash
Nobody in this house has carried an envelope of twenties since 2019. The envelopes are twelve rows in a spreadsheet and a shared note on both phones with the current balance of each. Every card charge gets typed into the note within a day, usually the same evening, and the spreadsheet is reconciled against the bank on the first Sunday of the month.
What we kept from the cash version is the only part that matters: an envelope can be empty. A category with a budget you can exceed is not a budget, it is a note to yourself.
Refill day
The envelopes refill on the 1st, in full, regardless of what happened in the previous month. They are not a rolling balance and an underspend does not carry forward. This is the rule people argue with us about most, and the reason for it is that carrying forward turns a good month into permission, and by the third good month the envelope has quietly become $80 larger than the number we agreed to.
The exception is the sinking funds, which are the opposite: they exist precisely to carry forward, and they have their own page.
When an envelope runs dry
It stops. Groceries running out on the 26th means five days of eating what is in the freezer, and we have done that twice. The alternative is to move money between envelopes mid‑month, which is allowed exactly once per month, has to be agreed out loud by both of us, and gets written down in the issue. In practice we use the allowance about four times a year and feel bad about two of those.
The buffer, and what it is not
The buffer is $270 a month of deliberately unassigned money. It is not savings, it is not an emergency fund, and it does not accumulate — whatever is left of it on the last day of the month goes to the savings account with the following month's transfer. Its only job is to absorb the overshoot so that a $110 vet bill does not have to become a conversation about the retirement contribution.
The actual emergency fund is four months of expenses, sits at a credit union we do not have a card for, and is not discussed on this site because there is nothing interesting to say about a number that does not move.
What we do not track
Time, calories, mileage for its own sake, or anything belonging to the other person inside their $80. The personal envelopes are the one place where no explanation is owed and none is asked for, and removing that from the ledger did more for the survivability of this budget than any of the other eleven rows.
Re‑setting the amounts
Once a year, the first weekend in March, we take the trailing twelve months of actual spending per envelope and reset each planned amount to it, rounded to the nearest dollar and then argued about. Between resets the numbers are frozen even when they are visibly wrong, which is currently the case for utilities: the trailing twelve now averages $230 against a $210 envelope, and it will keep running over until March. We think that is still better than adjusting whenever reality disagrees with us, because in our experience the adjustments only ever go one way.