Simple rule for now
Set aside money as income arrives. Even a rough planning percentage can be more useful than waiting until the tax return is due.
Tax reserve estimate
A rough planning tool for building a tax set-aside habit in your first year. It gives a planning estimate based on your inputs, not a final tax calculation.
Estimate what you may want to set aside for tax.
A calm planning tool that helps you build a rough tax reserve based on your current figures for the tax year.
Your details
Use the total income for the selected tax year. This is a planning estimate only.
Enter your details
Add a few details to see a practical starting point.
?
Choose the year you want this estimate to apply to.
?
Use the mode that best matches the figures you have.
Reserve estimate
A rough planning estimate based on your current inputs.
?
Before expenses, for the selected tax year.
?
Add this only if it applies to you.
?
Optional. Leave as zero if you only want a simple income-based estimate.
?
Optional. Use this to compare your current set-aside with the estimate.
Your guide
Based on the details you add.
not_enough_income_data
Estimate not ready yet
Enter a rough income first to get a planning guide.
Projected net profit
£0.00
Income Tax estimate
Your guide will appear here.
Class 4 NI estimate
Your guide will appear here.
Already set aside
£0.00
Remaining reserve to consider
£0.00
Monthly set-aside
A monthly guide will appear after you enter income
What affected this result
- Tax year: 2025-26
- Total income used: £0.00
- Expenses used: £0.00
- Estimate mode: Yearly total
Next useful step
Enter your rough yearly income first. Use this as a guide, not professional tax advice.
Use this as a planning guide, not as a final tax calculation.
How to read this
This tool gives a planning guide based on the details you add. It is not a final tax calculation, an official HMRC result, or a replacement for professional advice.
What SelfYear uses
- Details you entered on this page
- Selected tax year, where relevant
- SelfYear planning assumptions
- No connection to HMRC
Inside the dashboard
- Projected annual income from entered records.
- Rough reserve estimate from shared planning logic.
- Monthly reminder to review your set-aside.