What Exactly is a "Payment on Account"?
Navigating the UK tax system can feel like trying to solve a puzzle where the pieces keep changing shape. If you’ve just looked at your HMRC dashboard and seen a "Payment on Account" (PoA) charge for 2026, you might be wondering why you’re being asked to pay for next year before this one is even over.
Here is everything you need to know about how Payments on Account work in 2026, the key deadlines, and how to manage the "Making Tax Digital" shift.
What Exactly is a "Payment on Account"?
Think of a Payment on Account as a "down payment" on your next tax bill. HMRC essentially assumes you will earn roughly the same amount this year as you did last year. To prevent you from getting hit with one massive bill every January, they split your predicted tax into two advance instalments.
The 2026 Deadlines
In the 2026 calendar year, you are dealing with two different tax years. Here is the schedule:
Date, What is Due? Which Tax Year?
31 January 2026 Balancing Payment (any leftover tax)2024/25 31 January 2026 1st Payment on Account (50% of last year's bill)2025/26
31 July 2026 2nd Payment on Account (Remaining 50%)2025/26
31 January 2027 Final Balancing Payment2025/26
Do These Rules Apply to You? (When Am I required to make payments on account)
HMRC doesn't make everyone pay in advance. You are only pulled into the Payment on Account system if:
Your last Self Assessment tax bill was £1,000 or more.
You paid less than 80% of your tax at source (e.g., through PAYE on a side job).
Note: If you owe £999, you just pay it in one go on 31 January. If you owe £1,001, you’ll suddenly be asked for that £1,001 plus an extra £500.50 as your first Payment on Account. This "double whammy" often surprises people in their second year of self-employment.
The "Big Change": Making Tax Digital (MTD) 2026
From 6 April 2026, the way you report income is changing. If you are a sole trader or landlord with a qualifying income over £50,000, you must now comply with Making Tax Digital for Income Tax.
What stays the same: The Payment on Account deadlines (January and July) are not disappearing.
What changes: You will now send quarterly updates via software rather than just one big annual return.
Why it matters: These quarterly updates will give you a much more accurate "running total" of what you owe, making those July and January payments less of a guessing game.
Can You Lower the Amount?
If you know your income has dropped (perhaps you lost a big contract or took a sabbatical), you don't have to pay the full estimated amount. You can "Claim to Reduce Payments on Account" through your HMRC online portal.
A word of caution: If you reduce your payments and it turns out you actually earned more than you thought, HMRC will charge you interest on the difference from the date it was originally due.
Tips for 2026 Tax Planning
The 11-Character Reference: When paying, always use your Unique Taxpayer Reference (UTR) followed by the letter 'K' to ensure the money reaches your account instantly.
Separate Your Savings: Set aside 25-30% of every invoice into a dedicated tax pot. In a "Payment on Account" year, you are essentially paying 150% of your tax bill in January.
Check the Interest Rates: As of 2026, late payment interest rates are significantly higher than they were a few years ago. Missing the 31 January or 31 July deadlines can become expensive very quickly.
Are you transitioning into the £50,000+ bracket this year, or are you still reporting under the traditional Self Assessment rules?
