If you are self-employed, a company director, or earn untaxed income, you probably already know about the self-assessment tax return deadline. But what often surprises people across Kent is that filing your return is only the first step. Paying your bill on time is just as important.
Every January, we hear from business owners in Maidstone, Ashford, Canterbury and beyond who thought they were ahead of the game because they filed early. But when the payment deadline slips past, they are suddenly hit with interest, penalties, or unexpected stress.
Here’s everything you need to know, without the BS, to make sure you are ready for the 31st of January.
The Self-Assessment Payment Deadline: What You Need to Know
The 31st of January 2026 is the official deadline for both filing your self-assessment return and paying your tax bill. What many forget is that the payment includes:
- The tax owed for the 2024 to 2025 tax year
- Your first payment on account towards the 2025 to 2026 tax year (if applicable)
Even if your return was filed in October, your bill must be paid by the end of January to avoid interest charges.
What Happens If You Miss the Payment Deadline?
It is not just a matter of ticking a box. The consequences of missing the payment deadline can stack up quickly:
- Interest starts accruing from the 1st of February
- Late payment penalties may apply if the delay continues
- Your cash flow could suffer if you have not budgeted for the full amount
Worse still, many people are caught out by payments on account, which are advance payments towards next year’s tax. If you are unsure about whether these apply to you, speak to your accountant or use the resources available on Brisan’s Self-Assessment Support page.
What If You Cannot Afford to Pay?
If your tax bill is higher than expected and you know you will struggle to pay it, do not ignore the problem. You have options, but they depend on acting early.
HMRC offers a Time to Pay service, which lets you set up a payment plan over several months. However, you must apply before the deadline and show that you are doing your best to pay what you can. The longer you wait, the harder it becomes to arrange a flexible solution.
If you already work with an accountant, ask them to help set this up. If not, or if communication has not been great, it might be worth exploring a more reliable option. Our team at Brisan Accountancy works with business owners across Kent who want a clear view of their finances, not last-minute panic.
How to Prepare Now and Avoid the Stress
To avoid a nasty surprise in January, use this simple checklist:
- Review your tax return and confirm the amount due
- Set funds aside now if you haven’t already
- Ask your accountant to explain payments on account clearly
- Apply for a Time to Pay plan before the deadline if needed
- Use reliable cloud software like Xero or QuickBooks to stay on top of your numbers
And if your current accountant goes quiet when it matters most, it might be time to consider switching. Brisan supports limited companies, sole traders, and businesses in construction and trades who want ongoing clarity, not last-minute stress.
Final Thoughts
The 31st of January comes around fast every year. By making a plan now, you can avoid fines, reduce stress, and start 2026 on stronger financial footing.
If you are looking for clear advice, regular updates, and an accountant who stays in touch (especially when deadlines loom), the team at Brisan is here to help.
