Introduction
If you’re self-employed or earning rental income, the start of a new tax year can bring uncertainty. You may be wondering what HMRC expects, what records you need, or how to avoid penalties later.
The good news is that early preparation makes everything easier, from Self Assessment filing to managing payments on account, if you want support getting organised before the 2025-26 tax year gathers pace.
This guide walks you through a practical, calm checklist so you know exactly what to do and when.
Understanding the 2025-26 tax year
The UK tax year runs from 6 April 2025 to 5 April 2026.
During this period, HMRC expects you to:
- Record all taxable income
- Keep evidence of expenses
- Maintain accurate digital or manual records
- Prepare for your Self Assessment return
If you’re registered for Self Assessment, your Unique Taxpayer Reference (UTR) links all activity to your HMRC account, so accuracy matters from day one.
New tax year checklist: How Self-employed & landlords can prepare early
Preparing early reduces stress and prevents last-minute errors.
1. Review all income sources
Make a full list of income streams.
Self-employed income may include:
- Freelance or contract work
- CIS subcontractor payments
- Online trading
- Consultancy or side work
Landlord income may include:
- Residential rent
- Holiday lets
- Commercial leases
- Service charges or maintenance contributions
Even small or irregular payments must be declared to HMRC.
2. Organise your records
Poor record-keeping is one of the most common reasons for filing mistakes and penalties.
You should keep:
- Sales invoices
- Purchase receipts
- Bank statements
- Mortgage interest statements
- Letting agent statements
- Repair and maintenance bills
3. Separate personal and business finances
Mixing finances creates confusion and increases the risk of errors during Self Assessment.
Practical steps:
- Use a dedicated business bank account
- Pay property expenses from one account
- Avoid using personal cards for business costs
Clear separation makes bookkeeping and HMRC enquiries far easier to manage.
4. Check allowable expenses
Claiming legitimate expenses reduces your taxable profit.
Self-employed allowable costs:
- Office supplies and software
- Travel for business
- Marketing and advertising
- Professional fees
Landlord allowable costs:
- Repairs and maintenance
- Insurance
- Letting agent fees
- Safety certificates
- Replacement furnishings
Many taxpayers either overclaim or underclaim. Reviewing expense rules can help you stay accurate.
5. Prepare for Making Tax Digital (MTD)
HMRC’s Making Tax Digital program continues to expand.
You may need to:
- Keep digital records
- Use MTD-compatible software
- Submit quarterly updates
Preparing now avoids rushed system changes later in the tax year.
6. Budget for payments on account
If your last Self Assessment bill exceeded £1,000, you’ll likely make payments on account.
This means paying tax in advance toward the next bill.
To avoid cash-flow stress:
- Set aside a percentage of each payment received
- Review last year’s liability
- Adjust savings if income rises
What HMRC expects from you
HMRC’s expectations are straightforward but strict:
- Accurate reporting
- Timely filing
- Evidence for claims
- Prompt payment
Failure in any of these areas can trigger:
- Late filing penalties
- Late payment interest
- Compliance checks
- Debt collection action
This is why preparation early in the tax year matters.
Common mistakes to avoid
Many self-employed taxpayers and landlords run into the same issues each year:
- Missing expense claims
- Poor record keeping
- Forgetting payments on account
- Mixing personal and business spending
- Ignoring HMRC letters
A small oversight can escalate into penalties quickly but most are preventable with early action.
Practical steps to take now
To stay ahead for 2025-26:
- Set up a record-keeping system
- Digitise receipts where possible
- Review last year’s tax return
- Estimate this year’s income
- Start a tax savings fund
- Check MTD readiness
What happens next?
As the tax year progresses, your responsibilities build:
- Ongoing bookkeeping
- Quarterly reviews (if under MTD)
- Expense tracking
- Income reconciliation
By the time the filing deadline approaches, organised taxpayers find the process straightforward while unprepared ones face stress and rushed submissions.
How Tax2u can help
Preparing for a new tax year doesn’t mean handling everything alone.
Tax2u supports self-employed individuals and landlords with:
- Self Assessment filing
- Reducing penalties
- HMRC appeals
- Payment plan arrangements
- Ongoing tax support
Whether you’re newly self-employed or managing multiple rental properties, expert guidance keeps you compliant and confident.
to get ready for the 2025-26 tax year with clarity, structure, and peace of mind.
Final thought
The earlier you prepare, the easier the tax year becomes. We will help you from organising your records to submitting your return accurately and on time, our experts make the process simple and stress-free.