04/06/2026
There is a big benefit to completing your Self Assessment tax return early.
It is not just about avoiding the January rush. It also helps you understand whether your payments on account are likely to be correct.
The 2025/26 tax year ended on 5 April 2026, so you do not need to wait until January 2027 to know what your tax position looks like.
If you make payments on account, your second payment is usually due by 31 July. But because payments on account are normally based on last year’s tax bill, they may not match your current income.
If your income has gone down, you may be paying more than necessary unless the payments are reviewed.
If your income has gone up, you may need to plan ahead for a balancing payment in January.
Either way, early preparation gives you better information and more control.
Leaving everything until January can make tax feel more stressful than it needs to be. Reviewing the numbers earlier allows time to budget, adjust, and make informed decisions.
GMS Accountants can help review your Self Assessment position before the deadline becomes urgent.
https://gms-accountants.co.uk/blog/what-are-payments-on-account/