Write a buffer rule card
- Step 1Pick one real surprise cost as your first target
- Step 2Write one example that counts and one that does not
- Step 3Decide what a refill would look like if you use the buffer
To start an emergency fund, pick a first target small enough to reach within a few months, set aside a small fixed amount on the same day each time money comes in, and write down beforehand what the money is for. When you use it, refill it before you start saving for anything else. The size matters less at first than the habit and the rules.
This guide is about organising the habit. It does not cover which account, product or provider to keep the money with. For that, use independent information that applies where you live.
What a small buffer is for
A buffer sits between an unplanned cost and the rest of your month. A repair, a replacement phone charger, a prescription, an urgent trip to see family: these are the moments when, without a buffer, a surprise spills into rent, food or bills.
A small buffer will not cover every possible problem, and it is not meant to. Its job is to make the ordinary surprises less disruptive. A larger safety net can come later, once the small one exists and the habit holds.
Choose a first target from your own history
Generic targets are easy to find and hard to relate to. A more useful starting point is your own past year.
Set a first target in one sitting
- List the surprises.
Write down unplanned costs from the last year that you remember: repairs, replacements, unexpected appointments, a deposit you did not see coming.
- Find the common size.
Most lists have a "typical" surprise. Circle the amount that comes up most, or the middle one.
- Make that your first target.
One typical surprise is enough for a first buffer.
- Pick a rough date.
Divide the target by what you could set aside each time money arrives. That gives you a realistic finish date, not a promise.
- Write the target and date somewhere you will see them.
A note on your phone is fine.
| If your list shows... | A first target could be... |
|---|---|
| Many small surprises | The cost of one typical small surprise |
| One or two large ones | A part of the large one, as a first stage |
| Nothing you remember | A small round amount you choose, reviewed after three months |
| Costs that repeat every year | Not a buffer target: plan those as known bills instead |
That last row matters. A car service, an annual subscription or a yearly fee is not a surprise if it happens every year. Put those in your calendar as bills, so the buffer stays free for real emergencies.
Make setting aside feel automatic
Willpower is a poor savings plan. The aim is to decide once, then let the routine carry it.
- Use the day money arrives. Set aside your amount on payday, or on the day any income comes in. Money set aside first is not waiting to be spent.
- Keep the amount small and fixed. A small amount you never miss beats a large one you skip. You can raise it later.
- Keep it apart from everyday money. Whatever you choose, make the buffer a little harder to spend by accident than your everyday money.
- If your bank lets you schedule a regular move between your own accounts, that can make the step automatic. If not, a recurring reminder on payday does the same job.
If your income changes from week to week, use a rule rather than a fixed amount: "Each time money comes in, I set aside a small part before anything else. In a low week, I set aside less rather than nothing."
Write a rule card: what counts as an emergency
Most advice skips this, and it is why buffers quietly disappear. Decide now, while nothing is urgent, what the money is for. Copy this card and fill it in.
My buffer rule card
- This money is for costs that are necessary, unexpected and urgent. All three.
- Examples that count for me: ________________
- Examples that do not count: ________________ (sales, holidays, gifts, planned bills)
- Before I use it, I will: wait one hour, or ask myself "would this still be urgent tomorrow?"
- After I use it, I will refill it by setting aside ________ each time money arrives.
If a cost is necessary but not urgent, it can usually wait for its own small plan. If it is urgent but not necessary, it probably belongs in ordinary spending.
Example: Sam's first buffer
An illustrative example (Sam is made up): Sam listed last year's surprises and found three of similar size: a phone screen repair, a replacement work shoe and a last-minute train ticket to a family event. One of those became the first target.
Sam decided to set aside a small fixed amount every payday, before paying anything else, and wrote a rule card with two examples that counted (repairs needed for work, urgent family travel) and two that did not (sales, birthday presents).
Four months in, a laptop charger broke. Sam used part of the buffer, then set the next goal: refill to the same target, with the same payday amount. The buffer took a dent, but nothing else in the month had to move.
When you need the buffer before it is full
This is the situation people worry about most, and it is normal. A half-built buffer that pays for a repair has done its job.
- Use it. That is what it is for. Keeping the total intact was never the goal; covering the surprise was.
- Record what you used and why. One line is enough. It helps you check later whether the rule card is working.
- Restart from what is left. The target stays the same. You are refilling, not starting over.
- If the cost is bigger than the buffer, cover what you can and look at the rest separately. If you are struggling to cover essential costs or falling behind on bills, a free, independent money or debt advice service in your country can help you look at your options.
Refill after you use it
Refilling is the step that keeps a buffer alive. Treat it as the next goal rather than a punishment.
- Keep the same amount each time money arrives, unless you can comfortably add a little for a while.
- Refill before starting any new savings goal, so the cushion is back first.
- If the buffer is used often for the same kind of cost, that cost may be regular. Move it out of "emergencies" and plan it as a known bill or part of your monthly spending.
How Armored Kitten helps
Armored Kitten is built around one manageable step at a time, and a buffer is mostly that: one small amount, set aside on one familiar day, then the same again next time.
In the Money workspace of the Mini App you can Create a savings goal with a name, a target, an amount already saved and a deadline date. Each goal shows a progress bar with what you have saved, the target and the deadline. When you set money aside, use Add savings to record the amount, and the progress updates. Once the saved amount reaches the target, the goal stops taking additions and leaves the list of active goals.
A savings goal is a record of what you tell it. Armored Kitten does not hold, move or set aside money for you. Adding savings to a goal updates the goal only: it does not create an income or expense entry in your records.
A goal can only go up: there is no step for taking money back out of it, or for deleting it. When you use the buffer, record the actual cost as an expense in the usual way. To track the refill, create a new goal, for example "Refill buffer", with the amount you used as the target. The old goal keeps showing its old total.
For costs that turn out to be regular, Add a bill or subscription lets you record a bill with a due date that happens once or repeats weekly, monthly, quarterly or yearly, so it stops competing with the buffer. Optional private reminders for bills due today are off until you turn them on. If Money is on and you have no savings goal yet, the companion may ask about one now and then, at most four times, and each message has an Opt out button.
Money tracking sits inside the optional Plus subscription, and a free trial for new adult accounts comes first. There is no setup form: once your account has access, Money switches itself on, and you only pick your currency if it is not the US dollar. Turning tracking off keeps your goals and entries; deleting your Money data removes them permanently. Open Money in the Mini App to create your first goal.
If a yearly fee or renewal keeps catching you out, the life-admin checklist is a good place to list those dates so they stop arriving as surprises.
Questions people often ask
How big should my emergency fund be eventually? That depends on your situation. Larger targets are often described in terms of months of essential costs. Reach a small first target before deciding whether a larger one fits you.
Should I build a buffer while I owe money? That depends on what you owe, to whom and on what terms. A free, independent money or debt advice service can help you weigh it for your circumstances.
What if I can only set aside a very small amount? Start there. The routine matters more than the size at first, and a small amount still builds a cushion over time.
What if I keep using it for things that are not emergencies? Reread your rule card and add the thing you used it for to the "does not count" list. If the same need keeps coming up, plan it as part of your regular spending instead.