The process, demystified
How a disclosure actually works
It’s a clear, five-step process — and once you can see the whole path, it stops feeling like a leap into the dark.
A voluntary disclosure to HMRC sounds daunting, but most of the fear around it comes simply from not knowing what happens. So here it is, start to finish: what you do, what HMRC does, how long each part takes, and where you have breathing room. No jargon, no surprises.
The reassuring headline. The first step — simply telling HMRC you intend to put things right — carries no penalty at all. You’re just putting your hand up. Everything after that is orderly and paced.
The five steps, start to finish
Every voluntary disclosure follows the same shape. Here it is, in order:
- 1. Notify HMRC — put your hand up. You tell HMRC, online, that you intend to make a disclosure. You don’t need your figures yet — this step just registers your intention. HMRC sends back two references: a Disclosure Reference Number (DRN) and a Payment Reference Number (PRN). Crucially, notifying carries no penalty in itself, and it locks in the lower “unprompted” penalty terms.
- 2. The 90-day clock starts. Once HMRC acknowledges your notification, you have 90 days to prepare the full disclosure and pay. Helpfully, HMRC’s acknowledgement states your exact deadline date — so you never have to count the days yourself; just work to the date on the letter. That window sounds tight, but it’s enough — and you can take as long as you need before notifying, so you only start the clock when you’re ready.
- 3. Work out the figures. For each undeclared year: your rental income, minus your allowable expenses, gives your taxable profit. From that you work out the tax, then the interest and the penalty. You don’t include anything you’ve already declared. HMRC provides an online calculator, and the free tools on this site are built to help.
- 4. Submit and pay. You send in the disclosure — which includes a formal offer to pay what you’ve worked out — and pay using your PRN, within the 90 days. Can’t pay it all at once? You arrange a Time to Pay plan with HMRC before the deadline to spread it.
- 5. HMRC responds. HMRC reviews what you’ve sent. If they’re satisfied it’s full and honest, they send an acceptance letter. This offer-and-acceptance forms a legally binding agreement that closes those years. If they need more, they’ll write and tell you what.
The five steps, lived: one landlord’s walkthrough
To see how it feels in practice, follow a landlord we’ll call Raymond (made up, to show the shape of it). Raymond let a flat for six years and never declared the rent — not out of dishonesty, he just didn’t realise he had to, then felt too anxious to fix it.
From dread to done
Gathering (before the clock). Raymond takes a few unhurried weeks to pull together six years of bank statements and what receipts he can find. For two early years the receipts are patchy, so he notes what’s missing.
Step 1 — notify. He completes HMRC’s short online notification. No figures, no penalty — just registering his intention. HMRC sends his Disclosure Reference Number. The relief of having finally started is immediate.
Step 2 & 3 — the 90 days, and the figures. His acknowledgement states his deadline date. Because he’d already gathered everything, he works calmly through each year: rent, minus allowable costs, gives the profit; then the tax, interest and penalty. For the two patchy years he uses honest best-estimates with a short note explaining them.
Step 4 — submit and pay. He submits well inside the 90 days — submitting early trims the interest — and, because paying it all at once is a stretch, he arranges a Time to Pay plan before the deadline.
Step 5 — accepted. A few weeks later, HMRC’s acceptance letter arrives. Those six years are closed. Raymond keeps his records for six years, declares correctly from now on, and — his words — sleeps properly for the first time in ages.
Illustrative only — Raymond and the details are hypothetical, to show how the process unfolds. Your own situation will differ and should be confirmed with a professional. This shows how putting things right works — it is not tax-planning advice.
Which route is yours?
A natural first question is simply “which one do I even use?” “Disclosure” happens through one of a few named HMRC routes. The process above is broadly the same for all of them — but the right one depends on your situation:
UK residential rental income
You’re an individual who let out residential property. This is the vast majority of cases.
Route: the Let Property CampaignForeign income or assets
Overseas bank interest, foreign investments, or offshore matters beyond a simple foreign rental.
Route: the Worldwide Disclosure FacilityNot a simple residential let
Property held through a company, commercial property, or other income. A different route applies.
Route: the general Digital Disclosure Service — see company, joint & trading landlords.How long does a disclosure take?
The short answer: you have 90 days from notifying HMRC to submit and pay — but nothing is on the clock until you choose to notify. Here’s the real timing, so nothing catches you off guard:
- Before you notify: as long as you like. Nothing is ticking. Many people spend this time quietly getting their head around it and gathering paperwork.
- Notify → the clock starts: HMRC acknowledges, and the 90 days begin from that acknowledgement.
- Preparing & submitting: within those 90 days. Submitting early is good — it reduces the interest, because interest stops when you pay.
- HMRC’s review: after you submit, HMRC checks it. A straightforward, sensible disclosure is often accepted within a few weeks, though it can take longer if they want to look closely.
So the part with a deadline — the 90 days — only begins when you choose to start it. That’s the reassuring bit: you’re in control of the timing right up until you’re ready.
Valuable tips that genuinely improve the outcome
A disclosure done well is calmer, cheaper and more likely to be accepted first time. These are the practical things that make a real difference:
- Submit as early as you can within the 90 days. Interest runs until you pay — so every week you shave off the front end is money saved. There’s no prize for using all 90 days.
- If records are missing, use honest best-estimates — and say so. HMRC accepts reasonable estimates where records are genuinely lost. The key is to include a short narrative note explaining what’s missing and how you worked the figure out. A transparent estimate is far better than a gap.
- Gather your documents before you notify. Bank statements, tenancy agreements, and expense receipts, year by year. Doing this before you start the 90-day clock means the deadline is never a scramble.
- Only include years where tax is actually due. If a year made a loss, you don’t include it in the disclosure. Getting the right years in — no more, no less — keeps the figure correct.
- Claim every allowable expense you’re entitled to. Mortgage interest relief, repairs, agent fees, insurance and more reduce the taxable profit — which is the honest, correct figure, not a penny more.
- Be complete and straight. A full, honest disclosure is accepted; a thin or evasive one invites a closer look. Include all undeclared income, not just the rental.
Can I do my own disclosure? What you can do yourself — and where help earns its keep
A lot of this is genuinely within your reach. Here’s a candid split:
Well within your reach
- Notifying HMRC — it’s a straightforward online form; you’re just registering intent.
- Gathering your records — rent received, and receipts for allowable costs, year by year. This is the real legwork, and no one knows your properties better than you.
- A first draft of the figures — income minus costs, per year. The free tools here are built to help you sketch it.
How to prepare the groundwork yourself — a practical checklist
If you want to do the legwork before involving anyone, here’s exactly how:
- Build a simple year-by-year spreadsheet. One row per tax year (6 April to 5 April). Columns for: rent received, then each cost type — mortgage interest, repairs, agent fees, insurance, ground rent/service charge, other. One tab per property if you have several.
- Fill it from your bank statements. Rent in, costs out. Your statements are the backbone; tenancy agreements confirm the rent, and receipts or invoices back up the costs. Where a figure is genuinely missing, put your best honest estimate and note how you reached it.
- Work out each year’s profit. Rent minus allowable costs = taxable profit for that year. Remember mortgage interest gets the 20% credit rather than a full deduction — the calculators handle this.
A worked example for one year (illustrative)
Rent received (£800/month) £9,600 Less allowable running costs (repairs, agent, insurance) − £2,400 Taxable profit £7,200 Tax on the profit (basic rate, 20%) £1,440 Mortgage interest this year was £3,000… …which gives a 20% credit (£3,000 × 20%) − £600 Tax due for the year £840 Note the quirk: mortgage interest isn’t deducted from the rent like other costs — instead it gives you a separate 20% credit at the end. That’s why it sits below the profit line, not with the running costs.
Illustrative figures only, using 2026/27 basic-rate assumptions — your own rate and numbers will differ. You then add interest and any penalty on top, and repeat for each year.
- Decide which years to include. Only years where tax is actually due. Use the behaviour question (careless for most) to judge how far back — and leave out any loss-making year.
- Draft your notification. When your spreadsheet gives you a realistic picture, you’re ready to notify HMRC online — that starts the 90-day clock, and you’ll already have done the hard part.
Where a professional often earns their fee
This is the part that most often calls for a professional eye — and choosing help here is sensible and informed, not a failure:
- The final tax, interest and penalty calculation — especially across several years, or where the penalty behaviour question is finely balanced.
- Anything unusual — offshore elements, jointly-owned or company property, or a possible deliberate element (which is a different, more serious route).
- Responding if HMRC comes back with questions if they query the figures.
What happens after your disclosure — what “closed” means
Once HMRC accepts your disclosure and you’ve paid, that chapter is genuinely closed. But it comes with a few clear, easy obligations:
- Keep your records for six years. You don’t send receipts with the disclosure, but you keep them in case HMRC ever asks.
- Declare correctly from now on. The whole point is a clean slate — so your rental income goes on your tax return properly every year from here.
- One disclosure per person. If a property is jointly owned, each owner makes their own separate disclosure for their share. That share must reflect who genuinely owns the property — for married couples, a 50/50 default unless a valid Form 17 is in place. Getting the split right matters; see company, joint & trading landlords.
That’s the real prize at the end of this: not just a settled bill, but the quiet relief of a clean record and nothing hanging over you.
In plain English: a quick jargon-buster
The handful of terms you’ll meet, in the plainest words.
- “Voluntary disclosure”
- Coming forward to HMRC yourself to put right tax you didn’t declare — before they come to you. It attracts lower penalties than being caught.
- “Notify”
- The first step: telling HMRC you intend to disclose. No figures needed yet, and no penalty for doing it.
- “DRN” (Disclosure Reference Number)
- Your unique reference for the disclosure, which HMRC gives you after you notify. You quote it on everything that follows.
- “PRN” (Payment Reference Number)
- The reference you use when you pay HMRC what you’ve worked out you owe.
- “The 90-day window”
- The time you have, from HMRC’s acknowledgement of your notification, to prepare the disclosure, submit it and pay.
- “Offer” and “acceptance”
- Your disclosure includes a formal offer to pay a figure; HMRC’s acceptance letter turns it into a binding agreement that closes those years.
- “Time to Pay”
- An arrangement to pay in instalments if you can’t pay all at once — set up with HMRC before the 90-day deadline.
You’ve got this — it’s a path, not a cliff
Now you can see the whole route — five clear steps, paced at your speed until you choose to start the clock. That’s a world away from the fear of the unknown.
You don’t have to do everything today. The first move — understanding the process — you’ve just made. We’re based in Hounslow, west London, and help landlords across the UK. When you’re ready, notifying is a small, penalty-free step that puts you firmly back in control.
Ready to understand your own next step? Send us the details
The process is orderly — and you don’t start the clock until you’re ready. There’s no charge to make contact and no obligation. Tell us where you are and we’ll help you see the path.