HMRC Regulatory Update: From May 2026, conveyancers filing SDLT returns must register as tax advisers.
Every Feature Designed to
Support Your Practice
SDLT Check combines accuracy, transparency, compliance, and indemnity in one workflow—helping conveyancers work with confidence and meet regulatory expectations.
Protection & Indemnity
The features that support confidence and compliance
Full Indemnity Coverage
Our calculations are backed by £5M professional indemnity—so in the unlikely event of an error, the financial impact is covered by us.
What's Covered:
- ✓Your PI excess (typically £3,000-£10,000)
- ✓HMRC penalties and interest—covered in full
- ✓Legal defence costs (£15,000-£40,000)
- ✓Client's tax shortfall—we make your client whole
- ✓Your premium increases—we cover the knock-on costs
The Maths:
Single SDLT claim cost (3 years):
£43,000 - £106,000
SDLT Check annual cost:
Less than £2,400
The ROI isn't a question—it's obvious.
"SDLT Check has been great for us and our clients. It has taken the risk away from the firm having to calculate the liability and given clients a platform to answer the questions with detailed assistance knowing help is only at the end of the phone."
— Bennetts, Bennetts Solicitors (Trustpilot)
Risk Transfer Architecture
Our indemnity isn't a marketing gimmick—it's a legally binding risk transfer mechanism. If we're wrong, we handle the claim directly. Your PI insurer is never involved. Your claims record stays clean.
Read the Full Terms →PI Insurer Compatibility
We work WITH your professional indemnity insurance, not against it. Pre-approved methodology with major UK PI insurers. Some insurers offer premium consideration for firms using verified SDLT tools.
Download Insurer Letter Template →Calculation Engine
The most comprehensive SDLT calculator in the UK
All 49 Reliefs. Automatically.
The HMRC calculator handles about 12 reliefs. We handle all 49—and we're updated within 24 hours of any Finance Act changes.
Buyer Status
First-Time Buyer Relief, Additional Property Surcharge
Property Type
Mixed-Use Treatment, Non-Residential Rates
Residency
Non-Resident Surcharge (2%/5%), UK Resident Rules
Transaction Type
Linked Transactions, Sub-sales, Options
Exemptions
Group Relief, Charity Relief, Crown Exemption
Special Cases
Shared Ownership, Right to Buy, Rent to Buy
Leases
New Leases, Lease Extensions, Surrenders
Corporate
Corporate Acquisitions, ATED-Related
You don't need to know which reliefs might apply. Our intelligent question flow identifies applicable reliefs based on your answers. We ask about the transaction facts—we figure out the tax implications.
Mixed-Use Properties
Intelligent classification of residential vs. commercial elements to determine if non-residential rates apply—often saving clients thousands.
Non-Residential Rates
Automatic assessment of properties with commercial elements to identify potential savings over standard residential rates.
Non-Resident Surcharges
Current 5% surcharge rules with complex residency determinations and mixed ownership scenarios.
Linked Transactions
Automatic identification of linked transaction requirements with aggregation calculations.
Lease Calculations
Net present value calculations for new leases, extensions, and surrender and re-grant scenarios.
First-Time Buyer Edge Cases
Complex qualification rules including spouse ownership abroad and inherited property.
Calculation Accuracy
Our accuracy isn't a claim—it's a verified track record.
Compliance & Audit
Built for CQS Standard 1.2 from day one
CQS-Ready Audit Trail
CQS Standard 1.2 requires an audit trail of SDLT calculation and advice. Most firms cobble this together from file notes and calculator screenshots. SDLT Check generates it automatically.
When the CQS auditor asks about your SDLT process, you don't describe it. You show it.
Transparent Methodology
No black boxes. Every calculation shows its working.
- •Step-by-step calculation breakdown
- •Rate bands applied at each threshold
- •Reliefs applied with full reasoning
- •Legislative references for every decision
- •HMRC guidance citations where relevant
"Set up was easy and our clients are happy with the simple interface. Very helpful for shared ownership in particular and when asking a general question."
— Kenny Solicitors (Trustpilot)
Verification Workflow
CQS requires verification by "another experienced individual." SDLT Check makes this meaningful, not just a signature.
For solo practitioners: No second experienced individual available? SDLT Check provides the expert-level verification CQS expects—backed by tax specialists and £5M indemnity.
Regulatory Update Tracking
SDLT rules change constantly. We track them so you don't have to.
- • Major changes: Updated within 24 hours
- • Guidance updates: Updated within 48 hours
- • System notification sent to all users
- • Change log with plain-English explanations
Integration & Workflow
Works with your existing systems
Case Management Integration
No double-entry. No manual file management. No copying and pasting.
Open API Available: We have an open API and work with individual firms on a case-by-case basis to tailor integrations to your specific systems and needs. Contact us to discuss your requirements.
Proclaim
Available
Auto-population, one-click calculation, automatic file saving
Osprey Approach
Available
Seamless data sync, matter linking
Hoowla
API
Data transfer, report export
PCMS
API
Bi-directional sync
Your CMS
Custom
We work with your firm to build tailored integrations
Open API
Available
Full API access for custom development
How it works:
- 1Click "Calculate SDLT" from within your matter
- 2Data auto-populates — property address, client details, purchase price
- 3Answer additional questions (typically 2-3)
- 4Calculation and audit trail auto-save to matter documents
API Access
Building your own systems? Our API gives you full calculation capabilities with comprehensive documentation.
View API Documentation →Browser-Based Access
No software to install. No IT department required. Just log in and calculate from any modern web browser.
Data Import/Export
Manual entry, CMS auto-population, or bulk upload via CSV. Export as PDF, auto-save to CMS, or CSV data export.
Support & Expertise
You're never alone with a difficult case
Expert Support
Truly unusual case? Our team includes tax specialists who've seen everything.
What you get:
- • In-app expert request — Flag any calculation for expert review
- • Response within 4 hours — Faster for urgent completions
- • Tax specialist review — Not a help desk, actual SDLT experts
- • Indemnified answer — Expert guidance covered by our £5M PI
"I had a transaction involving a non-resident trust acquiring a mixed-use property with linked purchases. The expert team called me back within two hours, walked me through the issues, and gave me an indemnified figure. That's not support—that's a lifeline."
— Michael Foster, Partner
Help Resources
Self-service:
- • Searchable knowledge base
- • Video tutorials for every feature
- • FAQ library
Interactive:
- • In-app chat support
- • Email support
- • Phone support (Business plan and above)
- • Screen-share assistance available
SDLT Knowledge Hub
Go beyond the calculator with our comprehensive SDLT resources.
Updates: Finance Act summaries, Budget analysis, HMRC guidance interpretations
Tools: Free basic calculator, mixed-use eligibility checker, residency status tool
Security & Reliability
Enterprise-grade protection for your data
Data Security
- • TLS 1.3 encryption in transit
- • AES-256 encryption at rest
- • Two-factor authentication
- • GDPR compliant
- • UK data residency
- • SOC 2 Type II (in progress)
System Reliability
- • 99.9% uptime SLA
- • Redundant infrastructure
- • Automatic failover
- • Calculations complete in under 2 seconds
- • 24/7 infrastructure monitoring
Offline Capability
Completion day and internet's down? Support is still available.
Optional desktop app works without internet connection. Full calculation capability offline. Syncs when connection restored.
How We Stack Up
The difference: Other tools help you calculate SDLT. We help you calculate SDLT and back it with full indemnity and compliance support.
| Feature | HMRC Calculator | Generic Software | SDLT Compass | SDLT Check |
|---|---|---|---|---|
| Reliefs covered | ~12 | 20-30 | 40+ | All 49 |
| Indemnity coverage | ✗ | ✗ | Limited | £5M full |
| PI excess covered | ✗ | ✗ | Partial | 100% |
| Transparent methodology | ✗ | Rarely | Some | Full |
| Legislative references | ✗ | ✗ | Some | Every step |
| CQS audit trail | ✗ | ✗ | Basic | Comprehensive |
| CMS integration | ✗ | Some | Limited | Open API |
| Expert support | ✗ | Email only | Phone | Chartered advisors |
| Price | Free | £50-200/mo | £200-400/mo | £12.50/txn or Ad Hoc |
Plans for Every Firm Size
Full Service
For firms committed to accuracy on every transaction
£12.50 +VAT
per transaction, invoiced monthly
Usually added as a disbursement to clients
Ad Hoc Access
For one-off complex or borderline cases
From £300 +VAT
Based on transaction value (£300-£1,150)
Can be billed to client directly
All plans include:
Ready to See These Features in Action?
See every feature working with your actual transactions. Bring your most complex case—we'll show you exactly how we handle it.