This software is licenced. Enter your licence key to continue. Contact hello@codegeist.co.uk to obtain a licence.
Licence Key
🔐 Licensed to:
Add Tax Year
Enter a tax year label — e.g. 2026/27. Each year stores its data separately.
Clear Year Data?
This will permanently delete all entries for this year.
Import from CSV
Import a previously exported CSV file to restore your data. This will replace all entries for the current year.
📂
Click to choose a file, or drag & drop a CSV here
📋 Generate SA100 Pre-fill PDF
This generates a reference PDF with your tax data mapped to the correct SA100 box numbers. Enter your personal details — these are only used for this PDF and are not stored.
Full Name
UTR (10 digits)
National Insurance No.
Date of Birth
Phone Number
Postcode
Tax Deducted from Employment via PAYE (from your P60)
£
⚠️ Reference document only. This PDF helps you complete the official SA100 but cannot be submitted to HMRC directly. Always verify figures and submit via HMRC Online or the paper form.
HMRC 2025/26 · FREE TOOL
UK Personal Tax Calculator
Calculate your income tax, dividend tax, and pension position for 2025/26. All calculations run in your browser — your financial data never leaves your device.
£500 dividend allowance at 0%. Above that: Basic 8.75% · Higher 33.75% · Additional 39.35%. Dividends held inside ISAs or SIPPs are tax-free and should not be entered here.
For pensions where tax is deducted at source (net), the calculator grosses up at 20% and credits that tax against your liability. For gross pensions (no tax taken), enter the full amount.
Pension Income — Gross (before tax at source)
Pension Income — Net (tax already deducted at source)
State Pension (gross annual amount)
Employer contributions are not taxable income but count toward the £60,000 annual pension allowance. Enter the employer's contribution amount here.
Personal pension contributions: enter the net amount you actually pay. The calculator adds 20% basic-rate relief automatically. Gift Aid donations are similarly grossed up and extend your basic-rate band.
Personal Pension Contributions (net amount you pay)
Gift Aid Donations
Trading / Property Allowance (up to £1,000 each)
Allowable Work Expenses / Professional Fees
Marriage Allowance (transfer received from spouse)
Blind Person's Allowance (£3,130)
Other Tax-Deductible Costs
Save a snapshot of your current tax position each month to track how your figures build up across the year.
Month
Gross Income
Tax Due
Eff. Rate
NI Est.
Note
Total Gross Income
£0.00
Tax Due (Net)
£0.00
Effective Rate
0.0%
Marginal Rate
20%
Tax BandBasic Rate (20%)
📊 Detailed Tax Breakdown
📋 2025/26 Allowances
⚠️ Guidance only — not financial or tax advice. Figures apply 2025/26 HMRC rates for England, Wales, Northern Ireland and Scotland. All data is stored locally on your device only. Always consult a qualified tax adviser for your personal position. Get in touch →
Enter each disposal (sale or gift of an asset). The £3,000 annual exempt amount is applied automatically.
CGT rates for 2025/26: residential property 18% (basic) / 24% (higher); other assets 18% (basic) / 24% (higher).
Losses from this year or carried forward reduce your net gain.
Residential Property Disposals
Other Asset Disposals (shares, funds, crypto, other)
Capital Losses
Foreign income is generally taxable in the UK if you are UK resident. Enter gross foreign income in £ sterling.
If foreign tax was deducted at source, enter it below — you may be able to claim Foreign Tax Credit Relief (FTCR)
to avoid double taxation, up to the UK tax due on that income.
Foreign Employment Income
Foreign Pension Income (gross)
Foreign Investment Income (dividends, interest, rental)
Foreign Tax Paid (for FTCR claim)
Use this section to record notes about your Self Assessment position — deadlines, HMRC reference numbers,
adviser notes, or anything else relevant to your return.
⚠️ CGT and foreign income rules are complex. This section provides estimates to help you understand your
position. The 60-day CGT reporting rule applies to UK residential property — you must report and pay within 60 days of completion.
For foreign income, your domicile status and any double tax treaties may significantly affect your liability.
Always confirm your position with a qualified tax adviser. Get in touch →
📊 Capital Gains Summary
Add disposals to see your CGT position
🌍 Foreign Income Summary
Add foreign income to see your position
📋 Supplementary Pages Required
Complete the sections above to see which SA supplementary pages you need