HMRC letters, read and routed the day they arrive.
Most of the risk in a firm's post is brown envelopes. ComplyPost scans them in bulk, identifies the letter type and the client, extracts the deadline inside, and delivers it — with a log to prove it.
THE BROWN ENVELOPE PROBLEM
Every HMRC letter is urgent until someone reads it.
A registered office mailbag is mostly routine — until the one penalty notice with a 30-day appeal window arrives on the same day as forty statements. Manual sorting treats them all identically: open, scan, rename, forward, hope.
ComplyPost reads the text. A payment reminder is filed as routine; a compliance-check opening is flagged critical and sits at the top of the queue until someone deals with it.
WHAT IT DETECTS
Classified by what the letter actually says.
Self Assessment
Notices to file, statements, payment reminders, and enquiry letters — matched to the individual or company they concern, with the response window flagged.
PAYE and payroll
Coding notices, P11D reminders, late filing warnings, and specified charge notices routed to whoever runs that client's payroll.
VAT
Registration confirmations, return reminders, surcharge notices, and repayment queries classified and delivered with their deadlines extracted.
Penalties and determinations
Penalty notices carry appeal windows. ComplyPost surfaces them as critical the day they arrive, not when the pile gets sorted.
Compliance checks
Enquiry openings and information requests are high-stakes and time-boxed — flagged with priority and a full audit trail of when they were received and sent on.
Debt management
Payment demands and enforcement warnings identified early, so the conversation with the client happens before the next escalation letter.
HOW IT WORKS
Four steps from envelope to evidence.
Scan the HMRC pile with the rest of the post.
No sorting first. One batch PDF from the scanner — ComplyPost separates the letters and picks the HMRC ones out itself.
Each letter is read, not just filed.
Letter type, tax reference, client company, urgency, and any deadline in the text are extracted automatically.
Deadlines become visible.
A penalty appeal window or a compliance-check response date is flagged on the letter and in the queue — before it expires quietly in a tray.
The client gets it the same day.
Clean PDF with a summary by email from your domain, or through the client portal — with delivery logged for the file.
HMRC post is one part of the job — see the full registered office management platform.
HMRC letter management questions
Can ComplyPost tell different HMRC letters apart?
Yes. The AI reads the letter text and classifies it — Self Assessment, PAYE, VAT, penalty notices, compliance checks, debt management and more — rather than treating everything from HMRC as one category.
How does it know which client an HMRC letter belongs to?
It matches the company name, taxpayer name, and references in the letter against your client list, using registered addresses and previous confirmations to improve accuracy over time. Uncertain matches are held for a human to confirm.
Does it detect deadlines inside the letters?
Yes. Filing dates, payment dates, appeal windows, and response deadlines mentioned in the letter are extracted and used to prioritise the queue, so time-boxed letters surface first.
What about Companies House post?
Handled the same way — confirmation statement reminders, strike-off warnings, and filing notices are classified and matched alongside the HMRC post. The platform manages the whole registered office mailbag, not just HMRC.
Is client tax correspondence stored securely?
Documents are encrypted and stored on UK-based infrastructure with role-based access, retention controls, and a complete audit trail of every view and download.
Put this week's brown envelopes through it.
Free plan includes 100 pages a month. No credit card needed.
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