🧾 Client Tool
Tax Self-Assessment Helper
Work through each section to build your 2024/25 Self Assessment return. We'll map every figure to the correct SA form box and calculate your estimated liability.
Personal details
Basic information about you and which sections of the return apply to your circumstances.
Which income sources apply to you?
Employment income
Salary, wages, PAYE income, benefits in kind
Self-employment income
Sole trader, freelance, consultancy work
Property income
Rental income from UK property
Investment & savings income
Dividends, interest, SJP bond gains
Pension income
State pension, annuity, drawdown income taken
Capital gains
Gains on investments outside ISA, property disposal
Foreign income
Overseas employment, rental, dividends
Employment & pension income
Enter the figures from your P60 (employment) and any pension income received during 2024/25. These will be pre-populated on your return from HMRC records — cross-check these figures against your P60.
Employment income (from P60)
£
SA100 Box 1
£
SA100 Box 2
£
SA101 Box 9
Car, medical insurance, accommodation etc.
Pension income
£
SA100 Box 5
Full new State Pension 2024/25: £11,502.40
£
SA100 Box 11
£
SA100 Box 11
Gross amount before PAYE deduction
£
SA100 Box 12
Self-employment income
£
SA103 Box 15
£
SA103 Box 17
£
Investment & savings income
Include all taxable investment income. Note: income from ISAs is never included here — it is completely tax-free and does not need to be reported.
Dividends
£
SA100 Box 13
From unit trusts, shares held outside ISA. First £500 tax-free (2024/25).
£
SA106
Savings & interest
£
SA100 Box 17
Gross interest before tax. PSA: £500 (higher rate) or £1,000 (basic rate).
£
SA100 Box 17
SJP investment bond gains
💡 Investment bond chargeable gains If you partially or fully surrendered an SJP Investment Bond this year, you will have received a chargeable event certificate from SJP. Enter the figures from that certificate below. If you only took withdrawals within the 5% allowance, there is no chargeable gain to report this year.
£
SA101 Box 4
Used to calculate top-slicing relief
£
SA101 Box 8
From your SJP chargeable event certificate
£
SA101 Box 4
Property income (SA105)
£
SA105 Box 20
£
SA105 Box 24
Repairs, insurance, letting agent fees (not mortgage capital)
£
SA105 Box 26
Restricted to 20% tax credit — not full deduction
Deductions, reliefs & capital gains
Things that reduce your tax bill — pension contributions, Gift Aid, and any capital gains outside your ISA or pension.
Pension contributions
£
SA100 Box 1 (Pensions)
Enter the net amount you paid (before basic rate relief added by provider). Higher/additional rate taxpayers claim the extra relief here.
£
Not deductible by you personally — for annual allowance monitoring only
Gift Aid donations
£
SA100 Box 5 (Gift Aid)
Gross amount (what the charity received including basic rate tax). Higher-rate taxpayers claim additional relief on the difference.
£
Capital gains (SA108)
💡 What needs to be reported? Report gains from: unit trusts held outside an ISA, investment bonds (if CGT applies — rare), residential property sales, business asset sales. ISA and pension gains are completely exempt and never reported. The annual CGT exemption for 2024/25 is £3,000.
£
SA108 Box 3
£
SA108 Box 4
£
SA108 Box 27
CGT on residential property: 18% / 24% (2024/25 rates)
£
SA108 Box 28
£
SA108 Box 5
Other reliefs
£
If employer didn't fully reimburse at HMRC approved rates
£
HMRC-approved professional body memberships
Your estimated tax position
Based on the figures you've entered, here is your estimated 2024/25 Self Assessment liability. These are estimates — your final liability may differ based on HMRC adjustments.
Income tax calculation
SA form reference guide
Important deadlines
Paper return deadline
31 Oct 2025
Online return & payment
31 Jan 2026
1st payment on account
31 Jan 2026
2nd payment on account
31 Jul 2026
⚠ Important disclaimer
This tool provides estimates only and does not constitute tax advice. The calculations do not account for all possible reliefs, surcharges, complex situations, or HMRC-specific adjustments. Before submitting your Self Assessment return, please discuss your tax position with your SJP adviser or a qualified tax adviser. All figures should be verified against official HMRC documents (P60, P11D, chargeable event certificates).
sjp-reporting.com · Prototype demo environment · All tax calculations are estimates only · Not for client use
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