HMRC Penalties & Investigations
What You Must Know in 2025
Whether you are a limited company, landlord, or self-employed person, receiving a call from HMRC regarding a tax investigation can be a worrying experience. In 2025, with new digital systems and stricter penalties in place, HMRC has become quicker and more precise in identifying mistakes and non-compliance.
At Taxaccolega Accountants, we’ve compiled a brief, up-to-date guide to the penalties HMRC can issue and how you can avoid HMRC penalties in the UK.
At Taxaccolega, we regularly deal with VAT registered businesses in Croydon, London, and across the UK who only realise something is wrong when HMRC sends a compliance letter. This guide exists to prevent that situation.
Table of Contents
- Why Might HMRC Investigate You?
- What Penalties Can HMRC Charge You?
- 1. Errors on Your Tax Return
- 2. Failure to Notify HMRC About Changes
- 3. Penalties for Late Filing (Self-Assessment, VAT, Corporation Tax)
- Why Self-Assessment, VAT, Corporation Tax penalties happen (UK)?
- HMRC Self-Assessment Penalties (2025)
- HMRC penalty for VAT return (under new digital rules)
- 4. Late Payment Penalties (NEW for 2025)
- 5. Serious Tax Avoidance
- How to Protect Yourself from Penalties in 2025
- What You Need to Do:
- What You SHOULD NOT Do:
- Help with HMRC fines and penalties Real 2025 Changes You Need to Know
- Real 2025 Changes You Need to Know
- Do You Need Help? Allow Taxaccolega to Assist
- Our Services:
- Final Word
Why Might HMRC Investigate You?
● Discrepancies in your self-assessment or VAT returns
● Unexplained falls in reported income
● Third-party anonymous tips or red flags
● Unreported earnings from digital platforms (eBay, Etsy, Vinted)
● Incomplete or missing records
What Penalties Can HMRC Charge You?
1: Errors on Your Tax Return
● Careless mistake: 0–30% of tax due
● Deliberate mistake (not hidden): 20–70%
● Deliberate and hidden: 30–100%
2: Failure to Notify HMRC About Changes
Examples:
● Your business hits the VAT threshold
● You sell a second property and owe Capital Gains Tax
● You move income offshore
● Penalties are 10% to 100% depending on whether it was an innocent mistake or intentional.
3: Penalties for Late Filing (Self-Assessment, VAT, Corporation Tax)
Why Self-Assessment, VAT, Corporation Tax penalties happen (UK)?
It happens when a business or individual fails to meet tax obligations such as filing tax returns late, paying amounts late, or submitting incorrect information.
HMRC Self-Assessment Penalties (2025)
● Your business hits the VAT threshold
● You sell a second property and owe Capital Gains Tax
● You move income offshore
● Penalties are 10% to 100% depending on whether it was an innocent mistake or intentional.
HMRC penalty for VAT return (under new digital rules)
● Your business hits the VAT threshold
● You sell a second property and owe Capital Gains Tax
● You move income offshore
● Penalties are 10% to 100% depending on whether it was an innocent mistake or intentional.
4: Late Payment Penalties (NEW for 2025)
● After 15 days: HMRC may charge 3% late penalty if no Time to Pay arrangement
● After 30 days: 3% penalty
● Plus, daily interest: Base rate + 4% (currently ~8.25%)
5: Serious Tax Avoidance
If HMRC suspects fraud or deliberate evasion, you could face:
● Criminal investigation
● Asset seizure
● Unlimited fines
● A maximum sentence of seven years in prison
How to Protect Yourself from Penalties in 2025
What You Need to Do:
● Practise cloud accounting software like Xero or QuickBooks
● Maintain digital copies of receipts and bank statements
● Voluntarily disclose any past tax mistakes
● Keep yourself updated on Making Tax Digital (MTD) deadlines
● Consult an accountant one a quarter to review your tax position
● Register for HMRC services (e.g., VAT, Self Assessment) as soon as you become eligible
What You SHOULD NOT Do:
● File tax returns late
● Estimate income without supporting documents
● Rely on outdated tax rules
● Assume “side hustle” income is exempt from tax
● Use offshore accounts or undeclared crypto wallets to avoid tax
What You SHOULD NOT Do:
Whether you are a limited company, landlord, or self-employed person, receiving a call from HMRC regarding a tax investigation can be a worrying experience. In 2025, with new digital systems and stricter penalties in place, HMRC has become quicker and more precise in identifying mistakes and non-compliance.
Note: HMRC interest charges cannot usually be appealed — they are automatic.
There must be reasonable excuse to cancel or reduce the penalty
● Like serious illness
● Fire flood or theft
● Family grief
● HMRC online service failure
Real 2025 Changes You Need to Know
● Late payment penalties now apply after just 15 days
● Interest rates for late tax have risen to over 25%
● Making Tax Digital rollout continues — MTD for ITSA applies to those earning over £50k from April 2026. Lower thresholds will follow by 2028.
● HMRC now tracks online seller income (eBay, Vinted, Amazon, Airbnb) more closely
● Consult an accountant one a quarter to review your tax position
● Register for HMRC services (e.g., VAT, Self Assessment) as soon as you become eligible
Do You Need Help? Allow Taxaccolega to Assist
Based in Croydon, London, we are a group of skilled, tech-savvy accountants that assist people and companies all over the UK in maintaining efficiency, compliance, and stress-free operations.
Our Services:
● Self-Assessment & Corporation Tax returns
● Defence and representation in HMRC enquiries
● VAT registration & filings
● Digital recordkeeping solutions (Xero, MTD setups)
● Guidance on cryptocurrency assets and offshore income
Final Word
HMRC is getting stricter and smarter every year. Getting the right advice early, staying organised, and being honest are the best ways to protect yourself in 2025. Choose a trustworthy accountant who prioritises your financial well-being to avoid needless worry and expensive fines.
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CALL NOWTake the stress out of UK taxes and accounting today — speak with a top-rated Taxaccolega chartered accountant for personalised advice tailored to your business or personal needs.
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