January is a cash cliff: Christmas wages, the VAT quarter and the 31 January tax bill on one page
December wages, the VAT quarter and the 31 January Self Assessment bill can land within weeks of each other. Put them on one page now, and let AI build the sheet.
January is a cash cliff: Christmas wages, the VAT quarter and the 31 January tax bill on one page
By Jason Sibley
January can bring several payments close together. Each may be expected; their combined cost can still catch you out.
This piece is general information, not tax or financial advice. Check your figures and dates with your accountant or HMRC.
Why January bunches up
Many owners pay early or add extras at Christmas. Write down your pay dates and amounts to see what leaves before the new year.
GOV.UK says you usually file a VAT Return every 3 months. The online filing and payment deadline is usually one calendar month and 7 days after that accounting period ends. A quarter ending around year end puts payment alongside other bills. Check your VAT account. Payment must reach HMRC by the deadline, including weekends and bank holidays. Allow time for it to arrive; email reminders are available through your business tax account.
Each payment on account is half your previous year's tax bill, due by midnight on 31 January and 31 July. Any balancing payment is also due by 31 January. You can be paying off last year and starting next year at once.
You don't need payments on account if your last bill was less than £1,000, or 80% or more of your tax was deducted at source, through PAYE for example. First-time filers pay the full bill plus the first payment on account in January.
What the official survey found
The Department for Business and Trade (DBT) published its Longitudinal Small Business Survey 2025 on 15 October 2026.
Among SME employers seeking working capital or cashflow finance in the last 12 months who didn't get all of it, Table 97 shows:
- 48% paid suppliers late or later than planned
- 30% paid staff late
- 40% used an existing agreed overdraft
- 38% used existing credit cards
The unweighted base is 280 (sample size). Treat these as signals, not a forecast for your business.
The report also says 47% of SME employers gave customers trade credit; 63% of those said late payment was a problem. Our note on getting paid without the awkward chase may help.
One page, three lines
One page can show weekly money in and out. Use three lines, with a running balance underneath.
On the money in line, record expected receipts based on invoices sent and payment terms. Under wages and other bills, record pay runs, rent, suppliers, card payments and other dated costs. Put VAT and Self Assessment on the tax line, in the weeks they must reach HMRC.
Take tax dates and figures from your HMRC accounts or accountant. Mark unknown numbers as gaps rather than guessing.
Payments on account, in plain terms
January's first payment on account comes on top of any balancing payment.
In HMRC's example, a £3,000 tax bill means payments on account of £1,500 each and a first January total of £4,500. It's an illustration, not your figure.
You can ask HMRC to reduce payments on account, online or by post, if you expect a lower bill. If it turns out higher, you'll pay interest on the difference. Talk to your accountant first. Check your online account under View statements.
Let AI build the sheet
AI can lay out the table using your figures. Replace the brackets below with your details:
I run a small UK business and want a one-page cash sheet for January. Use only my figures and dates. Do not invent amounts, dates, deadlines or tax rules. For missing information, write "GAP: owner to fill in" and carry on.
My buffer: the lowest bank balance I'm comfortable with is £[amount].
Opening bank balance on [date]: £[amount]
Expected receipts (date, who from, amount, how sure I am):
[paste here]
Wages and staff costs (date, amount):
[paste here]
VAT (date from my HMRC VAT account, amount or best estimate):
[paste here]
Self Assessment (balancing payment and first payment on account, amounts from HMRC or my accountant):
[paste here]
Other bills (date and amount, with a description):
[paste here]
Please:
- Make a weekly table from mid-December to mid-February.
- Include columns: week starting, money in, wages, VAT, Self Assessment, other bills, closing balance.
- Flag weeks where the closing balance falls below my buffer.
- List every gap and assumption for checking.
- Do not give tax advice. Tell me to check dates and amounts with my accountant or HMRC.
Check the table against bank statements and HMRC accounts before relying on it. Our weekly cashflow sheet guide explains how to keep it updated.
If the sheet shows a gap
Spotting a gap in late October gives you choices that may be gone by 30 January.
Speak to your accountant about your tax position. If the shortfall involves HMRC, ask early about your options, before the deadline.
Chase invoices before Christmas. Consider fixing your terms before Christmas if customers are paying slower. For costs ahead of the 28 October Budget, see our cost sheet note.
Use this checklist:
- [ ] Record Christmas pay run dates and amounts
- [ ] Find your VAT payment date
- [ ] Check your Self Assessment balancing payment and first payment on account
- [ ] Set your minimum comfortable bank balance
- [ ] Build the sheet from mid-December to mid-February
- [ ] Mark guesses as gaps and check them
- [ ] Call your accountant if any week dips below your buffer
- [ ] Chase overdue invoices before Christmas
A last word
At My AI Apprentice we run AI sessions for small businesses, including sitting down with your own figures and building a cash sheet like this. No pressure either way.