Portfolio Notes

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Product notes, implementation lessons, and operating guidance from across the Drakon portfolio.

CIS Monthly Return Due 19 October: A Contractor's Filing Checklist

If you're a CIS contractor, the return for the tax month 6 September to 5 October is due at HMRC by 19 October — with an automatic £100 penalty the moment it's late. A practical checklist for verifying subcontractors, getting deductions right, and filing on time.

Drakon Systems·14 October 2026·7 min read

VATmaking tax digitalsmall business

VAT Return Due 7 November: A Reconciliation Checklist for the Quarter Ending 30 September

If your VAT quarter runs March, June, September and December, the return and payment for the quarter ending 30 September are due at HMRC by 7 November. A practical checklist for reconciling sales and purchase VAT, chasing what you're owed, and avoiding the late filing and late payment penalties — before the clock runs out.

Drakon Systems·7 October 2026·6 min read

e-signaturecomparisonsmall-business

How to choose a UK e-signature tool: what to actually compare

Choosing a UK e-signature tool? Compare providers on the evidence they leave, where your data sits and how they charge, not on feature count.

Drakon Systems·6 October 2026·5 min read

e-signatureaccountantsengagement-letter

How to e-sign an engagement letter

How to send an engagement letter for electronic signature, what to keep on the client file, and where a simple e-signature stops. Written for firms in England and Wales.

Drakon Systems·5 October 2026·5 min read

product-updateaisecurity

Ekho 0.6.0: operator-key revocation that reaches your agents

Ekho 0.6.0 signs operator-key revocations so agents act on them, removes the unsigned revoke route and fixes OpenClaw plugin reloads. Upgrade the relay first.

Drakon Systems·5 October 2026·5 min read

invoicingVATHMRC

UK Invoice Requirements: What a Legally Valid Invoice Must Include (2026 Guide)

What must legally appear on a UK invoice? A plain-English checklist covering standard invoices, full and simplified VAT invoices, sole trader and limited company rules, and the mistakes that get invoices rejected — and paid late.

Drakon Systems·19 August 2026·8 min read

CISconstructiontax refund

How to Claim a CIS Tax Refund: A Guide for UK Subcontractors (2025/26)

Most CIS subcontractors overpay tax — the 20% deduction taken at source rarely matches what you actually owe. Here's how to reclaim it, what records you need, and how to work out your refund before you file.

Drakon Systems·24 June 2026·7 min read

late paymentinvoicingcash flow

How to Chase an Unpaid Invoice: A UK Small Business Guide (with Free Templates)

A step-by-step playbook for chasing late-paying customers — from the first polite reminder to statutory interest, a Letter Before Action, and the small claims court. Includes copy-and-paste email templates.

Drakon Systems·3 June 2026·8 min read

vatvat registrationsmall-business

VAT Registration Threshold 2026: When You Must Register and What Happens Next

The UK VAT registration threshold is £90,000 for 2026/27. If your taxable turnover is approaching that figure, here is exactly what you need to know — when you must register, how the process works, and what it means for your pricing, bookkeeping, and cash flow.

Drakon Systems·27 May 2026·8 min read

vatvat-registrationsmall-business

VAT Registration Threshold UK: What Small Businesses Need to Watch

The UK VAT registration threshold is not just an annual sales target. It is a rolling 12-month test, and missing it can create backdated VAT bills, penalties, and awkward pricing decisions. Here is what small businesses and bookkeepers need to monitor.

Drakon Systems·29 April 2026·9 min read

voice-aispeech-recognitionasr

Microsoft VibeVoice: What the Open-Source Voice AI Release Means for Real Businesses

Microsoft has released VibeVoice, a family of open-source voice AI models covering both speech recognition and text-to-speech. Here is a clear-eyed look at what is actually useful for UK businesses today, what was quietly pulled, and where the speech-recognition model is genuinely a step forward.

Drakon Systems·27 April 2026·6 min read

vatxerobookkeeping

VAT Return Checklist in Xero: A Step-by-Step Guide for UK Small Businesses

Filing a clean VAT return in Xero is a matter of process, not luck. Here is a practical step-by-step checklist for UK small businesses and bookkeepers to prepare, review, and submit VAT returns with fewer errors and less stress.

Drakon Systems·22 April 2026·10 min read

xerobookkeepingaccounts-payable

Duplicate Bills in Xero: How to Catch Them Before You Pay Twice

Duplicate supplier bills are an expensive, surprisingly common bookkeeping problem. Here is a practical guide for UK bookkeepers, accountants, and small businesses to spot duplicates in Xero before they distort costs or trigger double payment.

Drakon Systems·15 April 2026·8 min read

xerosupplier-invoicesaccounts-payable

How to Import Supplier Invoices into Xero Without Manual Data Entry

Manual supplier invoice entry slows down bookkeeping, creates avoidable errors, and makes bank reconciliation harder than it needs to be. Here is a practical guide to getting invoices into Xero faster, with less typing and fewer mistakes.

Drakon Systems·12 April 2026·7 min read

receipt-scanningexpensesbookkeeping

Receipt Scanning for Small Businesses: A Practical UK Guide

Lost receipts, unreadable photos, and end-of-month admin are still slowing down small businesses and bookkeepers. Here's a practical UK guide to receipt scanning, expense capture, and when AI automation actually saves time.

Drakon Systems·8 April 2026·6 min read

bank-reconciliationxeroautomation

How to Automate Bank Reconciliation in Xero: Save Hours Every Week

Bank reconciliation is the silent time-killer in every bookkeeping practice. Here's how to automate 80% of it in Xero — and why accurate invoice capture is the missing piece most people overlook.

Drakon Systems·1 April 2026·6 min read

accounts-payableautomationaccounting

Accounts Payable Automation for Small Accounting Practices: A Practical Guide

Small accounting practices waste hundreds of hours a year on manual invoice data entry. Here's how to automate accounts payable across Xero, Sage 50, and QuickBooks — without enterprise software or enterprise budgets.

Drakon Systems·25 March 2026·8 min read

xeroinvoice-processingaccounting

Xero Smart Document Capture vs AI Invoice Importer: When Built-In Isn't Enough

Xero just launched Smart Document Capture — AI-powered extraction built into Business Edition. It's good for individual users. Here's why accounting practices need something more.

Drakon Systems·23 March 2026·4 min read

payment-termslate-paymentsinvoicing

Payment Terms for Small Businesses: How to Set Terms That Actually Get You Paid

Late payments cost UK small businesses billions every year. Most of the damage starts before the invoice is even sent — with vague or missing payment terms. Here's how to set terms that protect your cash flow and what to do when clients ignore them.

Drakon Systems·18 March 2026·8 min read

making-tax-digitalmtdhmrc

Making Tax Digital for Income Tax: What Actually Changes in April 2026

MTD for Income Tax Self Assessment goes live in April 2026 for sole traders and landlords earning over £50,000. Here's what's changing, who's affected, and how to prepare your clients without losing your mind.

Drakon Systems·11 March 2026·7 min read

shopifyxeroautomation

How to Connect Shopify to Xero Without Paying for a Connector

Tradebox costs £150/month. A2X costs £50/month. We built a Shopify-to-Xero sync for free using Python and both APIs. Here's the full architecture, the mapping decisions, and the code.

Drakon Systems·10 March 2026·12 min read

aisecuritywebsocket

A Real WebSocket Hijack Hit an AI Agent Framework. Here's What We Learned About Defense-in-Depth.

A critical WebSocket brute-force vulnerability was disclosed in OpenClaw, one of the leading open-source AI agent frameworks. The fix was straightforward — but the incident exposed a deeper problem: most AI agent deployments have zero defense-in-depth.

Drakon Systems·4 March 2026·6 min read

taxsmall-businessaccounting

Tax Year End Checklist for UK Small Businesses (2025/26)

The 2025/26 tax year ends on 5 April. Here's a practical checklist for sole traders, contractors, and small business owners — covering VAT, expenses, mileage, CIS, invoicing, and Making Tax Digital deadlines.

Drakon Systems·4 March 2026·6 min read

xerosagesage one

Xero vs Sage 2026: Why We're Migrating Every Client

A practical comparison of Xero and Sage in 2026 based on real migration experience — covering cost, API capabilities, bank feeds, reporting, and why we now recommend Xero to every small business client.

Drakon Systems·3 March 2026·12 min read

vatsmall-businessaccounting

VAT Flat Rate Scheme Explained: Is It Right for Your Small Business?

A plain-English guide to the VAT Flat Rate Scheme for UK small businesses. How it works, who qualifies, the flat rate percentages by sector, and when it actually saves you money — with worked examples.

Drakon Systems·25 February 2026·7 min read

aiclaudegpt

Claude AI vs GPT for Business Automation: A Developer's Honest Take

We run Claude in production for invoice processing and an AI assistant. Here's what we've learned about Claude vs GPT for real business automation — the good, the bad, and the trade-offs nobody talks about.

Drakon Systems·24 February 2026·7 min read

CISconstructionaccounting

CIS Deductions Explained: A Complete Guide for UK Contractors & Subcontractors (2025/26)

A plain-English guide to the Construction Industry Scheme (CIS). Covers deduction rates, how to calculate what you owe, monthly returns, and how to reclaim overpaid tax.

Drakon Systems·18 February 2026·6 min read

xerosagemigration

How We Migrated a Business from Sage to Xero in One Day (And Saved £4,000/Year)

A real case study of migrating an e-commerce business from Sage Desktop to Xero — including 2+ years of data, 300K+ journal entries, and building a custom Shopify integration to replace a £150/month connector.

Drakon Systems·17 February 2026·7 min read

late paymentinvoicingsmall business

Late Payment Interest UK: How to Calculate What You're Owed (2025/26)

A complete guide to late payment interest and debt recovery costs under the Late Payment of Commercial Debts Act 1998. Includes a free calculator.

Drakon Systems·11 February 2026·4 min read

aisecurityautomation

Introducing ShieldCortex: The Security Layer Your AI Agent is Missing

AI agents have persistent memory now — Claude Code, OpenClaw, Moltbot, LangChain, and more. That memory is completely unprotected. We built ShieldCortex — universal middleware that scans, classifies, and protects everything any AI agent remembers.

Drakon Systems·1 February 2026·6 min read

invoicingautomationaccounting

How Much Does Manual Invoice Processing Really Cost Your Business?

The average invoice costs £12–£30 to process manually. Use our free calculator to find your actual invoice processing cost and see how much automation could save.

Drakon Systems·31 January 2026·4 min read

hmrcmileagetax

HMRC Mileage Rates 2025/26: Complete Guide + Free Calculator

Complete guide to HMRC approved mileage rates for 2025/26. Cars and vans: 45p/25p per mile. Plus a free mileage calculator for instant claims.

Drakon Systems·31 January 2026·5 min read

aiautomationproductivity

How We Gave Our AI Assistant Persistent Memory with Claude Cortex

AI assistants forget everything between sessions. Here's how we solved that with Claude Cortex — an open-source memory system inspired by how the human brain works.

Drakon Systems·29 January 2026·5 min read

invoice-automationxerobookkeeping

How to Automate Invoice Processing in Xero: A Complete Guide for Bookkeepers

Learn 4 practical methods to automate invoice processing in Xero. Save hours weekly with AI-powered extraction and smart workflows.

Drakon Systems·24 January 2025·5 min read

invoice-automationaicomparison

Why AI Beats Templates for Invoice Processing

Template-based invoice tools struggle with new suppliers. Here's why AI extraction works better for real-world invoice processing.

Drakon Systems·21 December 2024·3 min read

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