RentalBux vs. 11taxassist
Which MTD Software Is Better for UK Landlords and Sole Traders?
Overall Winner: RentalBux
RentalBux is the more complete MTD software for landlords and sole traders. It combines full Making Tax Digital compliance across UK property income, foreign property income, and self-employment income with comprehensive property management, automated bookkeeping, AI-driven expense categorisation, joint ownership profit-splitting, and a free plan for single-property landlords until March 2028. 11taxassist is a strong alternative for sole traders and landlords who want the absolute cheapest, simplest possible path to MTD compliance — a pay-per-filing submission tool at just £5.99 per return with no subscription, no contracts, and no ongoing commitment — but its filing-only design means it provides no property management, no bookkeeping, no bank feeds, no invoicing, and no ongoing digital record keeping.
At-a-Glance MTD Software Comparison
Key differences between RentalBux and 11taxassist across MTD compliance, property management, bookkeeping, pricing, and landlord-specific features.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Software Type | Property/Landlord Platform | Pay-Per-Filing MTD Submission Tool |
| Target Users | Landlords, Sole Traders, Letting Agents | Sole Traders, Landlords, Freelancers, Agents |
| Income Sources Supported | Sole Trader + UK Property + Foreign Property | Self-Employment + UK Property + Foreign Property |
| Free MTD Software Plan | Free until March 2028 (1 property) | No free plan (pay-per-filing: £5.99 per return) |
| MTD Quarterly Updates to HMRC | Yes | Yes |
| Final Declaration | Yes | Yes |
| Bank Reconciliation | Yes | No |
| Automated Bank Feeds | Yes | No |
| Invoice Creation | Yes | No |
| Receipt Capture (OCR) | Yes | No |
| Expense Auto-Categorisation | Coming soon | No |
| Property Portfolio Management | Yes | No |
| Tenant Management | Yes | No |
| Joint Ownership & Profit Sharing | Yes | No |
| Payroll | No | No |
| HMO Unit-Level Tracking | Yes | No |
| HMRC SA105 Box Pre-Mapping | Yes | No |
| Spreadsheet Import/Export | Yes | Yes |
| Platform | Web, iOS, Android | Web-based (all browsers and devices) |
| GDPR Compliant | Yes | Yes |
What Is RentalBux? What Is 11taxassist?
What Is RentalBux?
All-in-One MTD Software for Landlords and Sole Traders
RentalBux is an all-in-one property management, accounting, and Making Tax Digital compliance platform built specifically for UK landlords, letting agents, and self-employed individuals. Designed with direct input from accountants who specialise in property and sole trader tax, RentalBux covers everything from tenancy management and rent collection to full bookkeeping with a pre-configured chart of accounts tailored to the property sector.
RentalBux is fully HMRC-recognised for Making Tax Digital for Income Tax across all three qualifying income categories: UK property income, foreign property income, and self-employment. This makes it one of the only landlord-specific MTD software platforms that can handle a landlord who also runs a sole trader business, all from a single subscription.
A major differentiator is RentalBux's pricing model: single-property landlords can use the platform completely free until March 2028, making it one of the most affordable HMRC-approved MTD software options for landlords entering the MTD regime.
What Is 11taxassist?
11taxassist (11taxassist.co.uk) is a UK-registered HMRC-recognised MTD filing tool operated by 11taxassist Limited (Company Number: 16416027), based in Reading, England. The platform focuses exclusively on the submission step of Making Tax Digital — enabling sole traders, landlords, freelancers, and tax agents to submit MTD quarterly updates and the Final Declaration directly to HMRC with automatic tax calculations, error validation before submission, and instant HMRC confirmation with reference numbers.
11taxassist's core proposition is radical simplicity and affordability: instead of a monthly or annual subscription, users pay just £5.99 per filing (currently 63% off from the regular price of £15.99). There are no subscriptions, no contracts, and no ongoing commitments. For MTD ITSA, the £5.99 fee covers all 4 quarterly submissions plus the Final Declaration (5 submissions total per year). For MTD VAT, the same £5.99 fee covers 4 quarterly VAT submissions per year. The platform supports both individual filing and agent filing (accountants and tax agents with an Agent Services Account can file on behalf of clients).
Strengths
- Free MTD software for single-property landlords until March 2028
- Handles sole trader + UK property + foreign property income in one platform
- Joint ownership with automatic profit-sharing split by ownership percentage
- Pre-built chart of accounts tailored for landlords and sole traders
- AI-powered expense auto-categorisation and OCR receipt capture
- Agent filing on behalf of landlords — ideal for accountants and letting agents
- Supports HMO properties with auto-created units
Strengths
- Cheapest MTD filing option — just £5.99 per filing (63% off)
- No subscription, no contracts — pay only when you file
- HMRC-recognised for both MTD ITSA and MTD for VAT
- Supports self-employment, UK property, and foreign property filings
- Full Final Declaration support (replaces traditional Self Assessment)
- Agent filing supported (accountants with ASA)
- Automatic tax calculations and error validation before submission
- Downloadable record templates (Income Summary, Expenses Tracker)
- 256-bit encryption, UK GDPR compliant, UK-only data storage
- 99.8% first-time HMRC acceptance rate
- Money-back guarantee if submission fails due to software fault
- UK-registered company (Companies House No. 16416027)
Limitations
- Newer to market compared to established platforms
- No yield or LTV investment analysis tools
- No MTD for VAT support yet
- Some advanced reporting features still in development
- Limited third-party app integrations
- No offline capability
- No tax liability forecasting feature currently
Limitations
- Filing tool only — no ongoing digital record keeping
- No property portfolio management or tenant tracking
- No bank feeds, no automated bank reconciliation
- No AI-powered features, no OCR receipt capture
- No invoicing, no expense tracking, no bookkeeping
- No chart of accounts, journal entries, or formal P&L
- No joint ownership or profit-sharing automation
- No multi-user access or accountant portal
- No phone support (24/7 online support only)
- Records must be maintained separately by the landlord
- Newer to market with limited track record
- No cloud storage for ongoing financial records
Making Tax Digital Compliance
How RentalBux Handles MTD Compliance
RentalBux supports all three MTD qualifying income categories: sole trader income, UK property income, and foreign property income. This makes it suitable for landlords who also earn self-employment income, eliminating the need for separate software. Most accounts are pre-mapped to HMRC Self-Assessment boxes. RentalBux also supports agent filing, allowing accountants or letting agents to submit MTD returns on behalf of their landlord clients.
How 11taxassist Handles MTD for Landlords and Sole Traders
11taxassist is HMRC-recognised for MTD ITSA and supports quarterly updates plus the Final Declaration for self-employment, UK property, and foreign property income. The platform provides automatic income and expense calculations, displays allowable and disallowed expenses side by side, calculates taxable profit instantly from submitted figures, and generates an HMRC confirmation receipt with a reference number after each submission. 11taxassist also supports MTD for VAT with spreadsheet (Excel) upload. Agent filing is fully supported — tax agents with an Agent Services Account can manage clients' MTD ITSA and VAT submissions through the platform. However, 11taxassist does not maintain digital records throughout the year — users must keep their own records and enter figures into the platform at each quarterly filing point.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| HMRC Recognised (MTD ITSA) | Yes | Yes |
| MTD Quarterly Updates | Yes | Yes |
| Final Declaration | Yes | Yes |
| Digital Record Keeping | Yes | No |
| Digital Links Compliant | Yes | Yes |
| Sole Trader Income | Yes | Yes |
| UK Property Income | Yes | Yes |
| Foreign Property Income | Yes | Yes |
| Multiple Income Streams | Yes | Yes |
| Agent Filing on Behalf | Yes | Yes |
Winner: RentalBux for complete MTD lifecycle. It cover all three MTD income types and support the full submission lifecycle (quarterly updates + Final Declaration).RentalBux wins because it also provides the year-round digital record keeping that HMRC requires under MTD
Property Management
RentalBux: Property Management
RentalBux provides comprehensive property portfolio management with tenant management, rent tracking, property expense allocation, and support for multiple properties. A standout feature is its joint ownership and profit-sharing capability: landlords can define ownership percentages once, and RentalBux automatically splits rental income and expenses. RentalBux also supports HMO properties, automatically creating individual units.
11taxassist: No Property-Specific Features
11taxassist does not offer any property-specific features. There is no property portfolio dashboard, no tenant management, no rent tracking, no per-property expense allocation, no joint ownership automation, and no HMO support. The platform is a filing tool — landlords enter their income and expense totals at each quarterly filing point. 11taxassist does provide downloadable record templates (Income Summary Template and Expenses Tracker Template) that follow HMRC's ITSA algorithms, but these are offline templates, not integrated software features.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Property Portfolio Management | Yes | No |
| Tenant Management | Yes | No |
| Rent Tracking | Yes | No |
| Property Expense Allocation | Yes | No |
| Multiple Property Support | Yes | No |
| HMO Property Support | Yes (auto-creates units) | No |
| Joint Ownership/Profit Sharing | Yes (auto-split by %) | No |
| Maintenance Tracking | No | No |
| Tenant Screening | No | No |
| Compliance Document Alerts | Yes | No |
| Arrears Tracking | No | No |
Winner: RentalBux — 11taxassist has zero property management features. Any landlord managing multiple properties, tenancies, or joint ownership structures will find RentalBux dramatically more capable. 11taxassist's downloadable templates help with record organisation but are no substitute for integrated property software.
Bookkeeping, Accounting & Digital Record Keeping
RentalBux: Structured Accounting
RentalBux includes a pre-built chart of accounts specifically designed for landlords and sole traders, covering rental income, mortgage interest, insurance, property repairs, professional services, utilities, and tenant deposits. All accounts are pre-mapped to HMRC Self-Assessment boxes. The platform supports cash basis accounting, bank reconciliation, and journal entries.
11taxassist: No Bookkeeping — Filing Only with Auto-Calculations
11taxassist does not provide bookkeeping, accounting, or ongoing digital record keeping. The platform's role begins at the filing step: landlords enter their income and expense figures, the software auto-calculates taxable profit (showing allowable and disallowed expenses side by side), validates for errors, and submits to HMRC. There are no bank feeds, no chart of accounts, no journal entries, and no financial reports. Records must be maintained elsewhere by the landlord.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Cash Basis Accounting | Yes | No |
| Chart of Accounts (Pre-built, Landlord-Tailored) | Yes (pre-built + custom) | No |
| Journal Entries | Yes | No |
| Bank Reconciliation | Yes | No |
| Automated Bank Feeds | Yes (Major UK banks) | No |
| Open Banking Integration | Yes | No |
| Double-Entry Bookkeeping | Yes | No |
| HMRC Box Pre-Mapping | Yes | No |
| Xero Integration | No | No |
| Spreadsheet Import/Export | Yes | Yes |
| Digital Record Storage | Yes | Yes |
Winner: RentalBux — RentalBux provides the complete digital record-keeping and accounting infrastructure that HMRC requires under MTD. 11taxassist only handles the submission step — the bookkeeping gap must be filled by the landlord using separate tools.
Invoicing, Expense Tracking
RentalBux: Expense Management
RentalBux includes OCR receipt capture, structured expense tracking with landlord-specific categories, auto-categorisation, invoice creation with customisable branding, and payment tracking with reminders.
11taxassist: No Invoicing or Expense Tracking
11taxassist does not provide invoicing, expense tracking, receipt capture, or any AI-powered features. The platform accepts income and expense totals at each filing point but does not help landlords track or categorise transactions throughout the year. 11taxassist does offer downloadable templates (Income Summary Template and Expenses Tracker Template) that landlords can use offline to organise their records before filing.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Invoice Creation & Sending | Yes | No |
| Invoice Customisation/Branding | Yes | No |
| Online Payment Collection | Yes | No |
| Payment Tracking/Reminders | Yes | |
| Expense Tracking | Yes | No |
| Receipt Capture (OCR/Photo) | Yes | No |
| Expense Categorisation | Yes | No |
| Automated Transaction Matching | Yes | No |
| Mileage Tracking | No | No |
| AI Auto-Categorisation | Coming soon | No |
Winner: RentalBux — RentalBux provides a complete expense management and invoicing toolkit. 11taxassist provides no expense tracking or invoicing — only downloadable templates for offline record organisation.
Reporting & Tax Forecasting
RentalBux: Formal Accounting Reports
RentalBux produces structured financial reports including profit & loss statements, balance sheets, journal reports, ledger reports, and trial balances. Smart categorisation helps ensure accuracy.
11taxassist: Submission Records Only
11taxassist generates downloadable PDF records of each submission to HMRC, including the HMRC confirmation receipt with reference number. The platform shows a clear breakdown of income, expenses (allowable and disallowed), and taxable profit before submission. However, there are no ongoing financial reports, no P&L, no balance sheet, no dashboard, and no per-property reporting.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Profit & Loss Report | Yes (formal) | No |
| Balance Sheet | Yes | No |
| Trial Balance | Yes | No |
| Dashboard/Overview | Yes | No |
| Real-Time Financial Data | Yes | No |
| Cash Flow Reporting | No | No |
| Tax Estimate/Forecast | Yes | Yes |
| AI-Powered Features | Coming soon | No |
Winner: RentalBux — RentalBux provides formal accounting reports landlords can use year-round. 11taxassist provides submission records and pre-submission breakdowns only — useful at filing time but no ongoing financial visibility.
Collaboration & Mobile Apps
RentalBux's Collaborative Features
RentalBux enables agent filing, which gives accountants and letting agents the ability to submit directly on a landlord's behalf.
11taxassist: Web-Based with Agent Filing Support
11taxassist is web-based and works on all browsers and devices (desktop, tablet, mobile). Agent filing is supported — tax agents with an Agent Services Account (ASA) can file VAT returns and MTD ITSA submissions on behalf of clients through HMRC's digital handshake process. However, there is no dedicated accountant portal, no multi-user access, and no phone support. 24/7 customer service is available online, and the platform is contactable via email.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Accountant/Advisor Portal | Yes | No |
| Multi-User Access | Yes | No |
| Agent Filing on Behalf | Yes | Yes |
| Bank Integration | Yes | No |
| Platform | iOS, Android | Web-based (all browsers and devices) |
| Web Browser Access | Yes | Yes |
| FCA Regulated | Yes | No |
| GDPR Compliant | Yes | Yes |
Winner: RentalBux for collaboration. RentalBux wins on accountant portal, multi-user access, and dedicated mobile apps.
Ease of Use, Support & Security
RentalBux: Guided Workflows
RentalBux uses guided workflows, clear dashboards, and no accounting jargon. The platform offers phone support, email/chat support, and a help centre with guides and knowledge base articles.
11taxassist's Ease of Use
11taxassist emphasises speed and simplicity — the platform claims users can submit in under 30 minutes. An 8-step guided process walks users from registration through to submission. 24/7 online customer support is available, though no phone support. The platform uses 256-bit AES encryption, multi-factor authentication, Tier 4 data centres, annual security audits, and UK-only data storage. UK GDPR compliant with zero data monetisation. Customer rating of 4.9/5 with 1,000+ users.
| Feature | RentalBux | 11taxassist |
|---|---|---|
| Phone Support | Yes | No |
| Chat Support | Yes | No |
| Email Support | Yes | Yes |
| Help Centre/Knowledge Base | Yes | Yes |
| FCA Regulated | Yes | No |
| Enterprise-Grade Security | Yes | Yes |
RentalBux Features
Sole Trader Income Support for MTD
RentalBux is one of the few landlord-focused MTD software platforms that supports self-employment income alongside UK and foreign property income within a single account. Landlords who also run a trade, consultancy, or freelance business can manage all quarterly submissions from one dashboard. Landlord Studio covers property income only.
Custom Chart of Accounts for Landlords
A property-tailored chart of accounts covering rental income, mortgage interest, insurance, repairs, utilities, letting agent fees, and more — all pre-mapped to HMRC Self-Assessment boxes. No setup required; the system is ready to use from day one. Landlord Studio has no equivalent.
Agent Filing on Behalf of Landlords
Letting agents and accountants can submit MTD quarterly updates and the Final Declaration on behalf of landlord clients directly from the platform. Landlord Studio allows accountant access but does not support submission on the landlord's behalf.
Branded Invoice Creation
Invoice creation with customisable branding for service charges and commercial landlords. Not available in Landlord Studio.
AI-Powered OCR Receipt Capture with Auto-Categorisation (Coming soon)
RentalBux's AI will read uploaded receipts and categorise the expense automatically against the pre-built chart of accounts. Landlord Studio's Smart Scan extracts dates and amounts but does not include AI-driven expense categorisation.
Formal Accounting Reports
Balance sheet, trial balance, ledger reports, and journal reports. Landlord Studio does not produce these natively.
Free Plan Including MTD Submissions Until March 2028
RentalBux's free single-property plan includes MTD quarterly submissions. Landlord Studio's free GO plan covers property management for up to three units but requires a paid PRO plan (from £12/month) to access MTD submission functionality.
Unique Features Only 11taxassist Offers
Pay-Per-Filing Pricing with No Subscription
11taxassist charges just £5.99 per filing with no subscription, no contracts, and no ongoing commitment. This is the cheapest per-transaction MTD filing option available — ideal for landlords who want to pay only when they actually file.
MTD for VAT Support
11taxassist supports MTD for VAT with spreadsheet (Excel) upload and direct HMRC submission.
Money-Back Guarantee
If a return fails to submit to HMRC due to a fault on 11taxassist's software, the filing fee is refunded in full — no questions asked.
99.8% First-Time HMRC Acceptance Rate
11taxassist reports a 99.8% success rate for first-time acceptance by HMRC, with over 5,000 successful tax filings. This high acceptance rate reduces the risk of resubmission or rejection.
Downloadable HMRC-Aligned Record Templates
11taxassist provides pre-built Income Summary and Expenses Tracker templates that follow HMRC's ITSA algorithms. Landlords can download these, enter their figures offline, and upload them at filing time.
24/7 Online Customer Support
11taxassist offers 24/7 online customer service.
256-bit AES Encryption with UK-Only Data Storage
11taxassist uses 256-bit AES encryption, multi-factor authentication, Tier 4 data centres, and stores all data exclusively in the UK. Annual security audits are conducted.
Who Should Choose RentalBux?
RentalBux is a strong fit if you:
Landlords with Mixed Income Streams
If you earn from both property and self-employment, RentalBux handles sole trader income alongside UK and foreign property income in a single MTD-compliant platform.
Joint Owners and Family Portfolios
The automated profit-sharing split is a standout feature. Define ownership percentages once and RentalBux calculates each owner's share automatically.
Budget-Conscious Landlords Entering MTD
Free MTD software for single-property landlords until March 2028, with no upfront commitment.
Landlords Who Want Proper Accounting Structure
Chart of accounts, journal entries, profit & loss, balance sheet, and trial balance give RentalBux a structured accounting foundation.
Accountants and Letting Agents
Agent filing on behalf, multi-user access, and spreadsheet import make RentalBux practical for professionals managing multiple landlord portfolios.
Commercial Landlords and HMO Owners
Invoice creation with branding for service charges, plus automatic HMO unit creation and tenant management.
Who Should Choose 11taxassist?
11taxassist is the better choice for:
Landlords Who Already Keep Their Own Records and Just Need to Submit
If you maintain your own digital records in spreadsheets, other software, or using 11taxassist's downloadable templates, and you simply need the cheapest way to submit your figures to HMRC, 11taxassist at £5.99 per filing is the most affordable option available.
Cost-Minimisers Who Want No Ongoing Commitments
No subscription, no contracts — pay only when you file. Ideal for landlords who want maximum cost control and don't want recurring software fees.
VAT-Registered Sole Traders and Landlords
11taxassist supports MTD for VAT with spreadsheet upload. If you need both VAT and income tax filing in one platform, 11taxassist covers both for £5.99 each.
Tax Agents Filing on Behalf of Multiple Clients
Agents with an ASA can file quickly and cheaply for many clients at £5.99 per filing per client — no bulk subscription required.
Landlords Who Want a Backup Filing Tool
Even landlords using other software may want 11taxassist as a backup — a quick, cheap way to submit if their primary software has issues at deadline time.