Cash Stuffing

Cash stuffing puts the month's variable spending into paper envelopes before you spend it. You label each envelope, stuff the cash you assigned, and pay only from that envelope. When it is empty, that category is done until next month. The envelope is the cap. The checking balance is a pile, and the pile does not know which dollars are restaurants.

Fidelity's page, dated October 9, 2025, calls cash stuffing an organization system that separates your money into envelopes for each planned expense. You set the budget first. You stuff at the beginning of the month. You pull cash from the matching envelope as you pay. The same page says the cash envelope budget is another name for the same steps. It works best for expenses that can change from month to month, such as dining out and gas, that you could pay in cash. Writing down take-home pay and the fixed bills, before you pick the amounts, is on how to make a budget.

Checked October 29, 2026. The prices in the Monarch section were read from the vendor pages linked at the end. A fact a page does not state is marked Not documented.

The steps

The order below is Fidelity's. The envelopes are not equal shares. Each one gets the amount you already assigned to that category.

1. Budget before you stuff. Fidelity's first step is the plan: daily needs and wants, debts you owe, and money you want to save. An envelope with no amount is a label. It is not a cap.
2. Label the envelopes. Fidelity's high-level examples are food, fun, transportation, repairs, and savings. A more detailed set splits food into groceries and restaurants. You choose how fine to cut it. A labeled envelope for every bill you can think of is how the first month stalls.
3. Stuff at the start of the month. Withdraw the total for the cash envelopes and put each designated amount in. Filling after the purchase is a diary. The envelope never had a chance to say no. Fidelity says you are not dividing the cash into equal piles.
4. Pay from the matching envelope. Bring that cash with you. A card payment does not make the envelope thinner. Fidelity says the visual reminder only works if the cash is the thing you spend.
5. When the envelope is empty, stop. Fidelity's check-in is the middle of the month: little cash left, and a lot of month left, means ease off. Once the envelope is empty, that is it for the category. The idea is not to borrow from another envelope, and not to go back to the ATM, until next month. The version that treats a move as the honest trade is envelope budgeting. Vanguard allows the move. This page follows Fidelity's stop.
6. Next month, change the amounts you will actually keep. Fidelity says to tweak the allotments. If utilities always have cash left and food runs out, lower utilities and raise food. Leftover utilities cash, on that page, goes to savings. It does not stay as surprise spending money.

A starter setup

Example household only. These are round numbers chosen so the arithmetic is easy to check. They are not a budget, a target for your rent, or a recommendation. Take-home pay for the month is $3,400. Rent, utilities, insurance, and the phone are paid from the account. Fidelity says many bills are online-only, and that cash stuffing is not designed for them. The page's workarounds are a running tab in marker, or stuffing the cash, paying online, and redepositing what you spent. This starter does neither. Those four bills are not paper.

$1,400 plus $150 plus $180 plus $45 is $1,775. $460 plus $130 plus $150 plus $70 plus $55 is $865. $1,775 plus $865 is $2,640. $3,400 minus $2,640 is $760. The withdrawal at the ATM or the teller window is $865, not $3,400. The $760 is Fidelity's savings idea: write the amount, and move that cash into an interest-bearing account instead of pulling it into an envelope. Cash in a drawer does not earn interest, and Fidelity lists that as a disadvantage. Lost or stolen cash may have no way back. The emergency-fund guide covers where a larger cash reserve belongs. This page does not rebuild it.

This example happens to name the whole paycheck. Fidelity's first step is to budget needs, wants, debts, and savings before you stuff. It does not say every dollar must be named until nothing is left. Naming every dollar until income minus the assignments equals zero is zero-based budgeting. You can stuff the five variable envelopes and leave cash unnamed. The unnamed pile is the failure mode below.

Restaurants start at $150. If $35 is left and a lot of the month remains, ease off while the envelope still has cash. When the envelope is at $0, a $28 dinner waits until next month. Fun still holds $70. Taking $28 from Fun, or walking back to the ATM for $28, is the exception Fidelity says not to make. $70 minus $28 would be $42, and the restaurants envelope would be $28 and then $0. The arithmetic can be made to balance. The method says not to do it.

How it differs from nearby methods

Envelope budgeting allows the move. Vanguard says that if you want to spend more, you take cash from another envelope. Fidelity's cash stuffing page says the idea is not to borrow until next month. Both are paper caps. The empty-envelope rule is the difference. The Vanguard steps, Goodbudget, and a starter that treats the move as the trade are on the envelope guide. This page does not re-rank that app.

A zero names every dollar. The $3,400 example happens to. An envelope plan can stop with cash still unnamed. Run both if you want both tests: stuff until the paycheck is named, then stop when an envelope is empty. The zero guide has the worked assignment. This page does not rebuild it.

50/30/20 is three percentages. Needs are 50 percent of take-home pay, wants are 30 percent, and savings plus debt payoff are 20 percent. Half of $3,400 is $1,700. Rent, utilities, insurance, and the phone are already $1,775. The percentage test and the envelope test answer different questions. The bucket lists are on the 50/30/20 budget rule guide.

A named future bill is a sinking fund. Fidelity lists repairs as an envelope you might label. A repair that is not due this month is not a pile of cash you need in the grocery envelope. How to divide a known annual cost across ordinary months is the sinking funds guide.

The $760 can be pay yourself first. Moving that amount before the envelopes are available to spend is a different habit, and it can sit on top of the stuffing. The transfer, and how Monarch records a savings goal, are on pay yourself first. This page does not rebuild the goal steps.

Budget vs actuals is the comparison after the month. Cash stuffing is the plan you fill first. Putting each planned line next to what left the envelope, then deciding whether to change next month's amounts, is budget vs actuals. This page does not rebuild that review.

Common failure modes

You spend, then you stuff. Fidelity's stuff step is the beginning of the month, after the budget. A purchase that waits for leftover cash is the method run backwards.

The empty envelope is ignored. The $28 dinner, paid from Fun or from a second ATM trip, is this one. Fidelity gives you the stop. A quiet borrow deletes the cap and leaves both envelopes wrong.

The bank balance is the cap. The account holds $3,400 when the paycheck lands. Rent is $1,400 of that. Restaurants are $150. A purchase that looks at $3,400 is spending the rent.

The same dollars in the envelope and on a card. You withdrew $865. If groceries are also paid on a card, and the envelope is not reduced, the $460 exists twice. Fidelity's online-bill workaround is the marker tab, or a redeposit after the online payment. Skipping both is how rent gets paid twice.

Cash with nowhere safe to keep it. Fidelity says you can lose the cash or have it stolen, possibly with no way to get it back, and that envelope cash does not earn interest. The $760 savings line is the one to move into an interest-bearing account. The $865 is the cash you are willing to carry because you will spend it this month.

Too many envelopes before the first stuffing. The starter is five cash envelopes plus a savings transfer. Fidelity says you can try the idea for one category, such as entertainment, if the full set is too much. Five is already a choice. Twenty is how the cash never gets divided.

Leftover cash treated as free. Fidelity sends leftover utilities cash to savings, and lets you change next month's allotment if you wanted the money in food instead. Spending the leftover because it is still paper is a second budget you did not write.

Monarch Money

Monarch Money is the default app if you want those stuffed amounts as category caps, with accounts connected, instead of only paper. Pen and paper still holds the envelopes. Monarch does not. A mode named cash stuffing, or a screen that holds physical envelopes: Not documented on the pages checked for this guide. What those pages do document is categories, category budgeting, Planned versus Actual versus Remaining, a way to record cash, and a way to cover an overspend. Monarch does not move money into or out of your bank. The getting started article, updated October 27, 2026, says money cannot be moved in or out of your bank accounts from within Monarch. The $865 withdrawal is one you make at the ATM or the teller window. Monarch records it after you enter it, or after the bank posts it.

Categories are the stand-in for the labels. The default categories article, updated September 29, 2026, says they function like folders or envelopes. You can rename a category, change its emoji, disable ones you do not use, and create custom categories and groups. Uncategorized cannot be disabled. Rename a default only when the new name is the same kind of spending. The article's example is a restaurant category renamed to dining out. An unrelated name, such as pet supplies on a restaurant category, should be a new category, because the internal id stays and new restaurant transactions can still land there. The default list already includes Groceries, Restaurants and Bars, Gas, and Fun Money. Household supplies may need a custom category if none of the defaults is that bill. The budget article, updated October 22, 2026, says there are about 60 category options, in three layers: type, group, and category. Income, Expenses, and Transfers are the types, and those cannot be changed. If you use category budgeting, the order on the settings page is the order in the lists.

Use category budgeting, not flex. Getting started says flex is the default: one flexible spending number, instead of a plan for every category. Category budgeting is the line-by-line approach. You can switch from the budget page settings. The article writes that path as Budget, then Settings. Flex will not give each envelope its own cap. The October 22 article says that in flex budgeting you can move money only to or from the flexible spending bucket as a whole, not between the categories inside it. Cash stuffing is one cap per envelope. That is the line-by-line type.

Planned is the amount you stuff. The same article says the first visit fills each category from the average of the last six months. That average is history. The $460 groceries line is a number you type into the text box. Recalculate default budgets replaces what you typed with a new six-month average. Clear all budget values sets them to $0. A category set to $0 is hidden at the bottom of its group. Clicking it still shows what was spent. A $0 plan is not an empty envelope you can see at a glance. You can also exclude a category from the budget. Excluded transactions stay in cash flow and spending totals. Excluding groceries hides the cap. Do not do that if the envelope is the point.

On the web, the budget page shows three columns: Planned, Actual, and Remaining. Mobile starts with the planned amount and the remaining amount. You can switch the last column between Remaining and Actual by long-pressing any of the numbers, or by pressing the column header. For the starter, type Planned as $460 groceries, $130 gas, $150 restaurants, $70 fun, and $55 household supplies. Give the account-paid bills a planned amount too. The article says you can follow an envelope or zero-based style when it is based on cash flow, where income equals expenses plus savings. $1,775 plus $865 is $2,640 of expenses. $2,640 plus $760 of savings is $3,400. That is the balance the article describes. Left to budget is the income remaining after planned expenses are subtracted from planned income. The article does not say that figure includes the savings contribution. The other-types list on the same article is one link, to a zero-based post. It does not name cash stuffing.

Actual does not move because the paper got thinner. You record the cash. The manual transactions article, updated October 21, 2026, gives two ways. The first is a manual account named something like Cash, for a running balance such as a wallet. The manual accounts article, updated October 20, 2026, says to add it from the Accounts page: Add Account, then Add manual account, pick a type such as cash, and enter the name and the current balance. After you withdraw $865, that balance can be $865. When you spend, add a manual transaction on that account, choose the category, and leave the balance toggle on. The toggle adjusts a manual account's balance by default. The category is what makes the restaurants Actual go up. One manual account per paper envelope: Not documented. The documented example is one cash account. The five caps are categories. Remaining on restaurants is the budget math. It is not a second stack of bills unless the paper envelope is also that stack.

The second way is for an ATM withdrawal that already synced. Split it into separate transactions, one per purchase, each with the right category. The article says splitting does not track a cash balance. If you want cash on hand, use the manual account. A withdrawal that stays as one line, in Cash and ATM or in Transfer, is not five envelopes. Transfer and Credit Card Payment are excluded from budgets and cash flow, so a transfer filed that way will not show in Planned or Actual. The $760 savings transfer has the same problem if it is categorized as Transfer. How a savings goal shows the contribution is the pay-yourself-first guide. This page does not rebuild it.

Monarch does not have a reconciling feature. A manual transaction is not removed if a matching transaction later syncs. Recording the $28 dinner by hand, and also leaving the card payment in the same category, counts the dinner twice. Delete or recategorize one of them in the same sitting. The article tells you that match will not clean itself up.

Remaining is the column that goes red when you pass the cap. The budget article's example is an overspent category at -$65. You click the red number, choose the category to move money from, and enter the amount. The total budget for the month stays the same. You can move money to or from any category whose amount is shown in a red or green pill. In the example, spending the $28 after restaurants is already at $150 makes Actual $178. $150 minus $178 is -$28. Moving $28 from Fun covers that red number. That is the borrow Fidelity says not to do until next month. Monarch documents the move. The stop is still the method. The full comparison of every planned line with the month's actual, including the sign difference between a gap and Remaining, is the budget vs actuals guide.

Leftover cash is a separate choice. Fidelity puts leftover utilities cash into savings. Rollovers, updated August 14, 2026, keep an expense category's remaining amount in that category next month. They cannot be applied to income. The formula is last month's rollover, plus this month's planned amount, minus this month's actual. Getting started says budgets reset each month unless you turn rollovers on, from the gear icon next to the category. A rollover does not move the leftover paper cash into a savings account. If restaurants has $35 left and rollover is off, next month's Planned is whatever you type again, not $150 plus $35. The worked month for a leftover that stays in the category, including a shortfall, is the rolling budget guide. The monthly progress report, updated May 7, 2026, is a mobile dashboard card. One page is Plan progress, and the detailed view is Actual vs Planned. That is the month you already tracked. It is not a cash envelope.

Price, read on monarch.com/pricing on October 29, 2026. There is no free plan. The pricing help, updated March 3, 2026, says Monarch only offers paid subscriptions, in US dollars, plus tax where it applies. Core is $14.99 a month, or $8.33 a month when billed $99.99 a year. Plus is $16.67 a month, billed $199.99 a year. Both plan cards say a free 7-day trial, then that price, and that a payment method is required. Cancel in settings before the trial ends. A month-to-month Plus price was not on the page. Not documented. The getting started article says you can add household members, such as a spouse, a partner, or a parent, for free. Each person has a login. Everyone shares the same accounts, transactions, and budget. You cannot hide an account from one of them. That is included with the paid subscription. It is not a free plan. Trial length, the annual price, and discounts are on Monarch Money pricing.

Monarch also publishes an MCP connector, updated October 22, 2026, for Core and Plus. Read-only is the default. Write access is separate, and you allow it. That connector is a way to ask about categories and spending you already have. It is not a cash-stuffing button, and it is not a free plan.

Where FYN fits

FYN is our product, and it is last. The envelopes on this page are something you run: a labeled amount, cash in the envelope, and a stop when it is empty. A dedicated cash-stuffing feature, or a physical-envelope feature: Not documented on the pricing page. The pricing page lists an autopilot budget on Free and on Pro, next to the home screen and a spending map. That is the budget the pricing page names. It does not say that budget stuffs cash into envelopes.

What the pricing page does list is the record of the spending that follows the stuffing. Receipt photos and emailed receipts are one monthly count, 20 a month on Free and 200 a month on Pro. Apple Pay and Google Wallet purchases are logged as you pay, on Free and on Pro. Groceries, a dinner, and the other purchases that would have come out of an envelope show up as you pay them, including a wallet purchase that never produced a photo. Ask FYN is 20 questions a month on Free and 500 on Pro. You can ask about the receipts and the purchases you have saved, then put that total next to the cash you already stuffed.

The free plan is $0. It does not expire and does not ask for a card. It includes 1 household member on Free. You can start there without linking a bank. A read-only connector lets assistants such as Claude and ChatGPT read FYN data. The free plan includes 500 MCP calls a day. Pro includes 10,000 a day. The MCP docs say a free account does not sync bank accounts, so tools that read bank data return little or no data until a bank is linked. Linking a bank is not on the free plan.

Pro is $9.99 a month. Bank sync is Pro only, through Plaid, for up to 15 accounts. That feed shows the ATM withdrawal and the card charges that never made a receipt photo. The pricing page lists unlimited household members on Pro. Everyone shares the plan's limits. The pricing FAQ says a shared member can be an owner, a member, or view-only. The household page is the longer description of those roles. Monarch also publishes an MCP connector, on Core and Plus, read-only unless you allow write. Updated October 22, 2026. FYN is not the only one. The plan table is on pricing.

FAQ

Sources

Checked October 29, 2026. These are the pages behind the guide. A line marked Not documented is a fact the linked page does not state.

• Fidelity, What is cash stuffing?, dated October 9, 2025. Label envelopes, stuff the designated amounts at the start of the month, pay from the matching envelope, and stop when it is empty. Do not borrow from another envelope or return to the ATM until next month. Leftover cash can go to savings. A savings envelope can be a written amount moved to an interest-bearing account: What is cash stuffing?.
• Take-home pay and fixed bills, before you pick the amounts: how to make a budget.
• Vanguard's envelope steps, which allow a move from another envelope. This page links it instead of repeating it: envelope budgeting.
• Assigning every dollar until income minus assignments equals zero: zero-based budgeting.
• Needs, wants, and savings as three percentages: the 50/30/20 budget rule.
• A monthly amount for a bill that does not come every month: sinking funds.
• A set amount moved to savings before you spend the rest: pay yourself first.
• Where to hold a larger cash reserve: how to build an emergency fund.
• Comparing each planned line with what you spent, after the month: budget vs actuals.
• The balance you have now, minus bills due before the next paycheck: how to calculate safe to spend.
• Creating your budget in Monarch, updated October 22, 2026. Category and flex budgeting. Planned, Actual, and Remaining on the web. A red remaining amount, like -$65. Move money to cover an overspend, and the month's total stays the same. About 60 categories. Transfer and Credit Card Payment are excluded from the budget. An envelope style is possible when income equals expenses plus savings. The other-types list links a zero-based post and does not name cash stuffing: Creating your budget.
• Default categories, updated September 29, 2026. Categories function like folders or envelopes. Custom categories, and the rename limit: Default categories.
• Getting started, updated October 27, 2026. Flex is the default. Switch from the budget page settings. Budgets reset monthly unless rollovers are on. Money cannot be moved in or out of bank accounts from within Monarch. Household members can be added for free on the same budget: Getting started.
• Manual accounts, updated October 20, 2026. Add a manual account, including a cash type, with a name and a current balance: Manual accounts.
• Creating manual transactions, updated October 21, 2026. A manual cash account named something like Cash, with the balance toggle left on, or a split ATM withdrawal. Splitting does not track cash on hand. Monarch does not reconcile a manual transaction against a later sync: Creating manual transactions.
• Rollover budgets, updated August 14, 2026. An expense category can carry its remaining amount into the next month. Income categories cannot. The formula is last month's rollover, plus planned, minus actual: Rollover budgets.
• Monthly progress report, updated May 7, 2026. A mobile dashboard card. Plan progress includes a detailed view of Actual vs Planned: Monthly progress report.
• Monarch Core and Plus prices, the 7-day trial, and the payment method. Core $14.99 a month or $99.99 a year ($8.33 a month). Plus $199.99 a year ($16.67 a month): monarch.com/pricing.
• Monarch pricing help, updated March 3, 2026. Paid subscriptions only. Prices are in US dollars, plus tax where it applies: Pricing.
• Monarch MCP connector, updated October 22, 2026. Available on Core and Plus. Read-only unless you allow write: Monarch MCP connector.
• Trial length, annual price, and discounts, in one place: Monarch Money pricing.
• FYN pricing. Free is $0 and does not ask for a card. The period is forever. Receipts are 20 a month on Free and 200 a month on Pro. Apple Pay and Google Wallet purchases are logged as you pay. Ask FYN is 20 questions a month on Free and 500 on Pro. Pro is $9.99 a month. Bank sync is Pro only, up to 15 accounts. The pricing page lists 1 household member on Free and unlimited household members on Pro: pricing.
• FYN household roles. A shared member can be an owner, a member, or view-only: household.
• FYN MCP docs. A free account does not sync bank accounts. Free includes 500 calls a day. Pro includes 10,000: MCP docs.