Self Assessment Payments on Account | Paisley & Glasgow | Marsal Accountants
Self Assessment Payments on Account in Paisley, Glasgow & Central Scotland
Payments on account are advance instalments toward next year’s Self Assessment bill, usually due 31 January and 31 July, based on your previous year’s liability. Missing either date triggers interest — even if your final bill turns out lower after you file.
Marsal Accountants is based in Paisley and helps sole traders, landlords, and mixed-income clients across Glasgow and Central Scotland plan these payments and stay on top of deadlines.
What are payments on account?
Payments on account are advance instalments toward your next tax year’s income tax (and Class 4 National Insurance where applicable). HMRC bases them on your previous year’s liability.
You typically get two instalments:
| Instalment | Due date (usual) | Amount |
|---|---|---|
| First | 31 January (same year as filing deadline) | 50% of prior year liability |
| Second | 31 July | 50% of prior year liability |
A balancing payment may still be due by 31 January after the tax year ends if your actual liability differs.
Who has to pay?
You may need payments on account if your last Self Assessment bill was above HMRC’s threshold (check current guidance on GOV.UK).
Common situations we see locally:
- Sole traders with growing profit
- Landlords with rental income on top of employment
- CIS subcontractors with limited deduction at source
- Company directors taking dividends who also have other untaxed income
If most tax is already collected through PAYE, you may have little or nothing to pay on account — but mixed income often triggers instalments.
How to reduce surprises before 31 July
- Estimate this year’s profit from up-to-date records — not last year’s figure alone
- Claim reliefs and allowable expenses you can support with evidence
- Apply to reduce payments on account (Form SA303) if you expect lower liability — but only if your estimate is reasonable; underpaying can mean interest
- Set aside cash in a separate account so July and January deadlines do not clash with business cash flow
Good bookkeeping through the year makes every step easier — especially with Making Tax Digital expanding for many Self Assessment taxpayers.
Scottish income tax reminder
Employees and many pensioners use Scottish tax bands when their tax code starts with S. Self Assessment still reconciles your full liability, including property and self-employment income. Getting records wrong affects both instalments and your balancing payment.
Common mistakes
- Assuming “no bill yet” means nothing is due — payments on account are separate from filing
- Missing 31 July while waiting to complete the tax return
- No separate tax reserve — using the same account for business and personal spending
- Ignoring Class 2 / Class 4 NI when budgeting instalments
How Marsal Accountants can help
- Self Assessment preparation and filing
- Payment planning for July and January deadlines
- Bookkeeping and records that support MTD-ready workflows
- Advice for landlords and property accounts
Contact us for a free consultation, or explore our Self Assessment tax returns service.
