The cash buffer is the milestone nobody photographs

People write to the desk already holding a stocks and shares ISA and a credit card that is not cleared. The ISA is the part they want to talk about. The card is the part that sets the interest rate on their life. We ask for the cash buffer before we ask what fund they bought, because a portfolio you might have to sell next month is not a portfolio. It is a savings account with extra steps and a chance of a loss.

Essential spending is a smaller number than "what left the bank". It is rent or the mortgage payment, council tax, energy, water, the food you would still buy if you were being careful, the travel that gets you to work, childcare you cannot pause, and any insurance or debt payment that does not wait. It is not the takeaway, the streaming stack, or the weekend in Bristol. Those can pause. The first list cannot.

One month of that list, in an easy-access account, is the buffer. Three months is the starter emergency fund. Six months, or longer if the work is seasonal, is the full fund. In a town where winter work thins out, six months can be polite fiction. A guest-house winter and a school-term contract are not the same risk, and the rung should say so in pounds, not in a slogan copied from a salary job in a city.

If selling the investment would hurt, the investment was never the emergency fund.

Where the cash sits is a second question. Interest above the personal savings allowance is taxable: £1,000 if you are a basic-rate taxpayer, £500 if you are higher rate, nothing if you are additional rate, on the rules as they stand. An ISA can shelter cash, and in 2026/27 you may still put the whole £20,000 allowance into a cash ISA. From 6 April 2027 that cash limit falls to £12,000 if you are under 65. None of that changes the job of the money. The job is to be there on a Thursday when the boiler dies. A clever rate that locks the cash for a year has failed the job.

We are not romantic about jars of coins. A jar on a counter is a picture. The account with the month's rent in it is the milestone. If you want a number to write down, take last year's essential direct debits, divide by twelve, and round up. Then stop opening new brokerage tabs until that figure is actually in the account.

The next rung, for many households, is the costly debt rather than a larger cash pile. Paying 20 percent or more to carry a card while you also hold three months of cash is a choice you should make with your eyes open. Some people keep a small buffer and throw everything at the card. That can be right. What is not right is pretending the card is a personality trait instead of a rate.

Student loans that follow your payslip are not this rung. If the balance is written off at the end of the term and the repayment is a percentage of earnings above a threshold, clearing it early can be a poor trade against an ISA or a pension match. It can also be a relief you are willing to buy. Those are different sentences. We refuse to collapse them into "debt is bad".

When the buffer exists, write the date in the notebook. That is the photograph. Then go to the ladder and tick it, if you like, on this browser alone.

This essay is general information from Clinkanteyoio, 16 Sweet Briar Cres, Newquay TR7 2JP. It is not personal advice. Telephone +44 7457126650. Email [email protected].