Sinking Funds: How to Stop Irregular Bills Wrecking Your Budget

Most of us budget well for the bills that land every month, like rent, council tax and broadband. It is the irregular ones that catch us out: the car MOT, the annual insurance renewal, the vet bill, Christmas. They are not really surprises, because we know they are coming. We just do not know exactly when our bank balance will be ready.

A sinking fund is a simple fix. It is money you set aside in small amounts each month for a known future cost, so that when the bill arrives, the cash is already waiting.

How a sinking fund works

Take a cost you know is coming, work out roughly how much it will be, and divide it by the number of months until it is due. That monthly figure is what you save.

For example, if your car insurance is about £600 a year, putting aside £50 a month means you will have the full amount when it renews, with no scramble and no credit card.

Which costs suit a sinking fund?

Think about anything that is irregular but predictable. Common ones include:

• Annual car costs such as MOT, tax, servicing and insurance
• Home insurance and contents cover
• Christmas, birthdays and other celebrations
• Holidays and weekends away
• Annual subscriptions and TV licence, if you pay yearly
• Vet fees or a pet insurance excess
• Replacing a phone, laptop or washing machine

Sinking fund or emergency fund?

They do different jobs. An emergency fund is for the genuinely unexpected, such as a sudden job loss or a boiler breaking down. A sinking fund is for things you can see coming. Keeping them separate stops you dipping into your emergency cash for Christmas presents, and helps you see clearly what each pot is for.

How to set one up

1. List your irregular costs by looking back over the last 12 months of bank statements.
2. Estimate each amount and add a little extra for price rises.
3. Divide by 12 (or by the months remaining) to get a monthly figure.
4. Open a separate pot or account for each, or one account with clear labels. Many banks let you create named savings pots for free.
5. Automate it with a standing order on payday so you never have to remember.

Making it stick

Start small. You do not need to fund every category on day one. Pick the one or two that cause you the most stress and build from there. If a bill turns out to be more than expected, adjust the monthly amount rather than giving up. And if you finish the year with money left in a pot, you have earned a nice little bonus, or a head start on next year.

The real benefit is peace of mind. Bills stop feeling like emergencies and start feeling like ordinary, planned parts of life.

This article is for general information only and is not financial advice. Your circumstances are unique, so consider speaking to a qualified adviser if you are unsure.