File your Self Assessment
From a blank return to filed-with-HMRC in one sitting — your figures pulled in, the maths checked, the SA100 submitted.
Connect to HMRC
Sign in once with your Government Gateway. We only ever read what we need to fill your return — you stay in control.
Step by step
The same journey, written out — so you can read it at your own pace.
- Connect to HMRC
Sign in once with your Government Gateway. We only ever read what we need to fill your return — you stay in control.
- Pull your figures in
Employment, tax already paid, self-employment turnover from your bank feed, pension and Gift Aid — gathered automatically from HMRC, your bank and your profile.
- Walk the guided wizard
A plain-English step for income, reliefs and any specialist pages. Every box is pre-filled and tagged with where it came from — change anything in a tap.
- Check the tax calculation
We compute the SA110 the way HMRC does — income tax, Class 2 & 4 NIC, the student loan, payments on account — and reconcile it against your HMRC record.
- File to HMRC
One tap submits the SA100 over HMRC’s gateway. You get the IRmark and submission receipt back in seconds — saved to your account as proof.
Common questions
Do I need my own HMRC login?
Yes — you connect with your own Government Gateway user ID. We never see your password; HMRC hands us a scoped, revocable token.
What if a figure HMRC holds is wrong?
Every pre-filled box is editable and tagged with its source. You can override anything before you file, and we flag mismatches for you.
Which supplementary pages are supported?
SA102 (employment), SA103 (self-employment), SA105 (property), SA106 (foreign), SA108 (capital gains) and SA109 (residence) — added automatically based on your answers.
File your Self Assessment without the dread
Connect HMRC, let us pre-fill the return, check the maths and file your SA100 — all in one place.
Start freeThis guide is general information, not personal tax advice, and reflects the rules we believe to apply as at June 2026 — rates and thresholds change. Always check your own figures against HMRC and consider a qualified adviser before acting. You remain responsible for the accuracy of anything you file.
Go deeper
The full guides and articles behind this journey.
Who must file, registration and deadlines, payments on account, the supplementary pages, penalties and the 2025-26 allowances.
Who is in scope, the April 2026/2027/2028 timeline, quarterly updates, the Final Declaration and the new penalty regime.
Relief at source only adds 20% at the pump. Higher and additional-rate taxpayers have to claim the rest — and millions never do.
More flight plans
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Connect HMRC and pre-fill everything
One secure connection pulls your tax record into AI TaxPilot — and pre-fills every calculator and wizard, with each figure tagged to its source.