Self Assessment Without the January Panic: A Practical Survival Guide!
For many people, Self Assessment has become associated with one thing: 31st January.
But completing a tax return should not really be about racing against a deadline.
Done properly, your Self Assessment should give you time to understand what you earned, make sure you have claimed appropriate expenses, know what tax you owe and—most importantly—plan for how you are going to pay it.
At Scipio Accounting Services, I believe that good accounting should remove uncertainty rather than create it.
Step 1: Know whether you need to file
Self Assessment is used by HMRC to collect tax that has not already been dealt with automatically through PAYE or another system.
That might include income from:
Self-employment
Property
Investments
Certain pension income
Capital gains
Other untaxed sources
If HMRC has issued you with a notice to file, that should not simply be ignored because you believe there is no tax to pay.
For the 2025/26 tax year, someone who needs to notify HMRC that they require Self Assessment will normally need to do so by 5 October 2026.
Paper returns are normally due by 31 October 2026, while online returns and the tax payment are normally due by 31 January 2027.
Step 2: Get the information together
This is often where the stress starts.
Depending on your circumstances, you may need:
Employment income and P60/P45 information
Pension income
Self-employed income
Business expenses
Property income and expenses
Bank interest
Dividend income
Pension contributions
Gift Aid donations
Details of disposals that could create Capital Gains Tax
Previous payments on account
Do not assume you need a perfectly organised folder containing every receipt before speaking to your accountant.
Bank statements, accounting software and other records can often help build the picture.
The important thing is to start the conversation.
Step 3: Do it earlier than January
There is a huge difference between the filing deadline and the date you should actually prepare your return.
You can submit a return after the tax year finishes. Filing earlier does not normally mean paying the tax earlier—it means knowing what you owe earlier.
That gives you time to budget.
I would much rather tell a client in July that they have £4,000 to pay the following January than tell them the same thing on 29 January.
HMRC itself encourages taxpayers to file earlier so they have more time to prepare for their tax bill.
Step 4: Understand payments on account
This catches many first-time Self Assessment clients by surprise.
Depending on your circumstances, your January payment can include:
The balance of tax for the previous tax year, plus
The first payment on account towards the following year.
A second payment on account can then become due on 31 July.
That does not necessarily mean HMRC is charging you twice. Part of the payment is effectively an advance towards the next year's liability.
The Scipio approach
My job is not simply to submit a return and tell you what to pay.
It is to explain:
Where the numbers came from
Why the tax is due
When it must be paid
What you might expect next year
Whether there are legitimate planning opportunities we should consider
Tax is considerably less intimidating when somebody takes the time to explain it in plain English.
Good Self Assessment should end with clarity, not simply a submission receipt.
If your tax return is approaching and you are unsure where to start, get in touch. It is almost always easier to deal with the problem early than wait until January.
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