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How to plan for once-a-year bills: a simple 12-month budget for UK households

By Khorne Projects · · about 6 minutes' read

A monthly budget is a great start. But some of the bills that cause the most stress don't come every month. They turn up once or twice a year: the car tax, the MOT, the TV Licence, Christmas, a birthday-heavy month. If they catch you out, it isn't a sign you're bad with money. It's just that a one-month view can't see them coming.

This guide shows you how to stretch your budget across a whole year, so those costs become small, boring monthly amounts instead of nasty surprises. If you haven't done a monthly budget yet, start with our guide to a simple monthly budget in the UK. Then come back here.

Step 1: List everything that doesn't come every month

Get your last 12 months of bank statements, or scroll back through your banking app, and note every payment that isn't monthly. MoneyHelper suggests writing down the dates as well as the amounts, and including expensive times of year like celebrations and holidays.

Common ones in UK households include:

A few UK figures to help, checked on GOV.UK:

Step 2: Put a date and an amount next to each one

For each cost, write down roughly when it's due and how much it was last time. Last year's statements are the most honest guide. MoneyHelper suggests adding about 10% extra in case prices go up, and using real amounts rather than guesses.

You'll often spot a "lumpy" time of year. For many households that's the stretch where car insurance, the MOT and Christmas land close together. Seeing it on paper months ahead is half the battle.

Step 3: Turn the year into a monthly amount

Add up the yearly costs and divide by 12. That's how much to move aside each month. If you're paid weekly or fortnightly, divide by the number of paydays instead.

If a bill is due sooner than 12 months away, work out how many paydays you have before it's due and divide by that. MoneyHelper is honest that the first year can feel expensive, because you're catching up. The following year, the amounts are usually smaller and steadier.

MoneyHelper calls these pots sinking funds and suggests keeping to five or fewer. For example, have one "Car" pot rather than separate ones for tax, MOT and insurance. Their free Savings calculator can work out how much to put aside regularly to hit a target by a date.

Step 4: Check whether paying monthly costs more

Some yearly bills can be spread monthly, and sometimes that costs extra. Vehicle tax is a clear example. GOV.UK says there's a 5% surcharge if you pay by monthly or six-monthly Direct Debit, and no surcharge if you pay yearly. For a car on the £200 standard rate, 12 monthly Direct Debits add up to £210.

If you've built up the money in a pot, paying yearly can be cheaper. For insurance and other bills, it's worth asking your provider what the total cost is each way before you choose.

Council Tax works the other way round. It's usually split into 10 monthly payments, which leaves two months a year without a bill. Some people move that amount into a pot anyway, so it's there for leaner months. If you're struggling to pay, contact your council straight away. GOV.UK says it can help, for example by spreading payments over 12 months instead of 10.

Step 5: If you have side income, plan for the tax bill too

If you send a Self Assessment tax return, tax owed for the 2025 to 2026 tax year must be paid by 31 January 2027. If you make "payments on account", there's a second payment deadline of 31 July. HMRC lets you estimate your bill before you send your return, so you can budget for it. Treat it like any other yearly cost and put a little aside each month.

Step 6: Keep the pots separate, and automate them

MoneyHelper suggests an easy-access savings account, or a bank with "saving pots", and a standing order that goes out just after payday. That way the money moves before you have a chance to spend it. If you find yourself dipping in at the end of the month, keeping the pots at a different bank can make them less tempting.

A sinking fund isn't the same as an emergency fund. Sinking funds are for costs you know are coming. An emergency fund is for the ones you don't, like a broken boiler or a drop in income. If you're starting from scratch, MoneyHelper suggests building the emergency fund first. One month's worth of expenses is a good place to begin.

Then check in once a month

A 12-month plan only works if you glance at it. Once a month, compare what you planned with what you actually spent, and move anything left over in a pot on to next year. You don't need to track every coffee. You just need to know which line went over, and why.

Tools: free and paid

You don't need to buy anything to do this. A notebook works. MoneyHelper's free Budget planner lets you enter a cost "per year" and turns it into a monthly average. Our free UK Monthly Money Snapshot covers a single month.

If you'd like the whole year laid out for you, we made the UK Household Budget Planner (£3.50). You set a planned amount for each category, log what you actually spend each month, and see yearly totals and the planned-versus-actual difference. UK bills such as Council Tax, the TV Licence, energy, water and broadband are already filled in. Spending over plan turns red. It works in Excel, Google Sheets and LibreOffice. But the habit matters far more than the tool.

See the Budget Planner (£3.50)

Useful official links

This is general information, not financial, tax or benefits advice. Rules can change, so check the linked official pages for your own circumstances. Written by Khorne Projects with AI assistance, and checked against the official sources above on 29 October 2026.

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