AccountsOS vs FreeAgent 2025: Best Accounting Software for UK Limited Companies

AccountsOS at £19/month offers AI-powered conversational accounting with instant answers 24/7, whilst FreeAgent at £29/month (+VAT) provides traditional accounting software with comprehensive features and NatWest banking integration. For UK limited company directors seeking modern, intuitive accounting with proactive tax guidance, AccountsOS delivers better value. For those wanting established software with extensive third-party integrations and bank partnerships, FreeAgent remains a solid choice.

Both platforms are UK-focused and MTD-compliant, but they represent different generations of accounting software. FreeAgent, owned by NatWest since 2018, has built its reputation as a cloud accounting pioneer. AccountsOS represents the next wave of AI-native accounting, designed for founders who want to chat with their books rather than navigate complex menus.

This comprehensive guide compares everything you need to make the right choice for your limited company.

Quick Comparison: AccountsOS vs FreeAgent

FreeAgent Pricing Breakdown (January 2025)

FreeAgent offers straightforward pricing with one main plan and notable bank partnerships:

Standard Plan - £29/month + VAT

Monthly cost: £34.80 (including VAT) Annual cost: £348/year paid monthly, or £312 if paid annually

Includes:

• Unlimited users
• Unlimited invoices
• Bank feed integration (350+ UK banks)
• Receipt capture via mobile app
• VAT returns with MTD submission
• Self Assessment filing
• Basic payroll (RTI-compliant)
• Project tracking and time management
• Expense tracking
• Multi-currency support
• Financial reports (P&L, Balance Sheet)
• Accountant access portal

Free with Partner Banks

FreeAgent's biggest differentiator is free access through NatWest Group partnerships:

• NatWest business account holders: Free
• Royal Bank of Scotland business account holders: Free
• Ulster Bank business account holders: Free
• Mettle account holders: Free

If you bank with any of these, FreeAgent becomes genuinely free accounting software. This partnership, resulting from NatWest's 2018 acquisition of FreeAgent, makes it an obvious choice for NatWest customers.

Add-on Costs

• Additional practice users: £5/month per user
• Advanced multi-currency: Included in base price
• Additional companies: Separate subscription required

Price Increases

FreeAgent has remained relatively stable on pricing, though the VAT-exclusive pricing means UK businesses pay £34.80/month rather than the advertised £29. Over time, minor increases have occurred, but nothing dramatic compared to some competitors.

AccountsOS Pricing

AccountsOS keeps it simple with all-inclusive pricing:

£19/month - Everything Included

• Unlimited users
• AI chat assistant (Claude Sonnet 4)
• Voice commands (Gemini Live)
• MTD VAT compliance
• Unlimited receipt scanning with AI extraction
• Bank statement import (Barclays, Revolut, Starling, Monzo, HSBC, Lloyds)
• Corporation Tax estimation
• P&L and Balance Sheet reports
• Deadline tracking and reminders
• Document storage (HMRC-compliant retention)
• Multi-currency support

No VAT to add. No hidden fees. No tier confusion.

Annual savings vs FreeAgent: £189.60 (more if you're not with a partner bank)

Feature-by-Feature Comparison

User Interface and Experience

FreeAgent: Traditional accounting software interface with dashboards, navigation menus, and report builders. Clean design for accounting software, but still requires learning where features live and understanding accounting terminology. Most users need 1-2 weeks to become comfortable.

AccountsOS: Chat-first interface. Ask questions in plain English like "What's my VAT liability?" or "How much did I spend on travel last quarter?" The AI handles the complexity. No learning curve because there's nothing to learn - just describe what you need.

Verdict: AccountsOS dramatically simpler. FreeAgent requires traditional software navigation skills.

Bank Reconciliation

FreeAgent: Direct bank feeds from 350+ UK banks via Open Banking. Transactions import automatically, often daily. Suggested matches and rules for recurring transactions. Manual categorisation required but streamlined.

AccountsOS: Bank statement import via CSV files from 6 major UK banks (Barclays, Revolut, Starling, Monzo, HSBC, Lloyds) with automatic format detection. AI suggests categories with confidence scores. Direct Open Banking connections planned.

Verdict: FreeAgent has superior bank connectivity with direct feeds. AccountsOS compensates with smarter AI categorisation, but the manual CSV step is a real friction point for some users.

Receipt Management

FreeAgent: Mobile app captures receipts. OCR extracts basic data. Manual matching to expenses and transactions. Works well but requires user involvement.

AccountsOS: AI-powered receipt scanning extracts merchant, amount, date, VAT, and line items automatically. Intelligent matching to bank transactions. Ask "Do I have receipts for all my expenses?" and get an instant answer.

Verdict: AccountsOS receipt handling is significantly more automated and intelligent.

VAT and MTD

FreeAgent: Full MTD compliance with direct HMRC submission. Supports standard, flat rate, and cash accounting schemes. VAT tracking built into transaction workflow. Well-established MTD functionality used by thousands of UK businesses.

AccountsOS: MTD-compliant VAT calculation with 9-box breakdown. Supports various VAT schemes. Direct HMRC submission available. Plus: conversational VAT queries like "Explain my VAT liability this quarter."

Verdict: Both handle MTD VAT well. FreeAgent has more mature infrastructure; AccountsOS adds understanding through conversation.

Invoicing

FreeAgent: Comprehensive invoicing with customisable templates, recurring invoices, online payments (Stripe, PayPal, GoCardless), automatic reminders, and credit notes. Strong invoicing workflow integrated throughout the platform.

AccountsOS: Create invoices via chat ("Invoice ABC Ltd for £1,500 consulting"). Professional templates, automatic numbering, payment tracking. Less customisation than FreeAgent, but zero-friction creation.

Verdict: FreeAgent offers more invoicing customisation and payment integrations. AccountsOS is faster for simple invoices.

Payroll

FreeAgent: Built-in payroll handles PAYE, National Insurance, pension auto-enrolment, and RTI submissions to HMRC. Works for both directors and employees. No extra charge for basic payroll functionality.

AccountsOS: Payroll currently in development. Recommends standalone payroll solutions for now. Director salary optimisation guidance available through AI chat.

Verdict: FreeAgent clearly better for integrated payroll. This is a significant gap for AccountsOS if you have employees.

Time Tracking and Projects

FreeAgent: Full time tracking with timers, project budgets, and profitability reporting. Useful for consultants and agencies billing by time. Can generate invoices from tracked time.

AccountsOS: No dedicated time tracking. Designed for businesses that bill by project or retainer rather than hourly.

Verdict: FreeAgent wins if time tracking matters to your business.

Reporting

FreeAgent: Standard financial reports including P&L, Balance Sheet, cash flow, aged receivables/payables, tax timeline, and project profitability. Customisable date ranges. Export to PDF or accountant formats.

AccountsOS: P&L and Balance Sheet reports plus conversational queries. Ask "How does this quarter compare to last year?" instead of building custom reports. Real-time Corporation Tax estimates.

Verdict: FreeAgent has more traditional report options. AccountsOS makes data accessible without report-building.

Corporation Tax

FreeAgent: Tracks allowable expenses and estimates Corporation Tax liability. Provides a tax timeline showing payment deadlines. Does not file Corporation Tax directly but prepares the data.

AccountsOS: Real-time Corporation Tax estimation with AI explanation of what's allowable. Proactive alerts about tax-saving opportunities. Guidance on expense timing and deductions.

Verdict: AccountsOS provides more proactive tax guidance. FreeAgent tracks but doesn't advise.

Who Should Choose FreeAgent?

FreeAgent makes sense if you:

Bank with NatWest, RBS, or Ulster Bank

Free FreeAgent access through your business bank makes this an obvious choice. You can't beat £0/month for full-featured accounting software.

Need integrated payroll

FreeAgent's built-in payroll handles PAYE, RTI, and pension auto-enrolment without add-ons. If you have employees, this is valuable.

Bill by the hour

Time tracking with project profitability reporting is excellent for consultants, freelancers, and agencies charging hourly rates.

Want extensive bank integrations

With 350+ direct bank connections, FreeAgent almost certainly supports your bank with automatic feeds.

Your accountant already uses FreeAgent

FreeAgent's accountant portal is well-developed. If your accountant recommends it, collaboration will be smooth.

Prefer traditional software interfaces

If you're comfortable with accounting software and prefer clicking through menus rather than chatting, FreeAgent is well-designed for traditional users.

Ideal FreeAgent User Profile

• Service-based business (consulting, freelance, agency)
• NatWest Group banking customer
• Needs time tracking and project costing
• Has employees requiring payroll
• Works closely with an accountant
• Comfortable learning accounting software

Who Should Choose AccountsOS?

AccountsOS makes sense if you:

Hate accounting software

If traditional accounting software feels overwhelming, AccountsOS eliminates the learning curve. Just ask questions in normal language.

Want instant answers

No waiting for reports to generate or navigating menus. Ask a question, get an answer immediately.

Value proactive tax guidance

AccountsOS doesn't just track transactions - it actively identifies tax savings, suggests optimal strategies, and explains HMRC rules.

Work on the move

Voice commands let you check your finances, dictate notes, or create transactions whilst driving or multitasking.

Want predictable, lower pricing

At £19/month with no VAT to add, AccountsOS costs significantly less than FreeAgent (unless you qualify for free NatWest access).

Run a micro-business or solo operation

AccountsOS is built specifically for UK limited company directors running small operations. No unnecessary enterprise features.

Prefer self-service with AI guidance

If you want control over your finances but with intelligent assistance, AccountsOS delivers.

Ideal AccountsOS User Profile

• Solo founder or micro-business (1-5 people)
• Limited company director
• Service-based or consulting business
• Tech-comfortable, prefers modern interfaces
• Wants tax optimisation, not just tracking
• Values 24/7 availability

The NatWest Factor

FreeAgent's ownership by NatWest Group creates both opportunities and considerations:

Advantages

• Free access for NatWest, RBS, Ulster Bank, and Mettle customers
• Seamless bank feed integration
• Financial stability and ongoing development
• Banking and accounting in one ecosystem

Considerations

• Acquisition raises questions about long-term independence
• Some features may prioritise NatWest integration over general utility
• Switching banks means losing free access
• Business banking choices constrained by accounting software

If you're considering switching banks to get free FreeAgent, calculate carefully. Business account fees at NatWest versus your current bank may offset the £29/month saving.

Cost Comparison Over Time

Let's calculate realistic costs for a UK limited company director:

FreeAgent (Standard Pricing)

• Monthly: £29 + VAT = £34.80
• Annual: £417.60
• With accountant for tax advice: £500-1,500/year additional
• Total: £917.60 - £1,917.60/year

FreeAgent (NatWest Customer)

• Monthly: £0
• With accountant for tax advice: £500-1,500/year
• Total: £500 - £1,500/year

AccountsOS

• Monthly: £19
• Annual: £228
• Occasional accountant consultation: £150-300/year
• Total: £378 - £528/year

Savings with AccountsOS:

• vs FreeAgent standard: £539.60 - £1,389.60/year
• vs FreeAgent (NatWest customer): AccountsOS costs £122-228 more, but includes AI tax guidance that may reduce accountant needs

For non-NatWest customers, AccountsOS offers substantial savings. For NatWest customers, the decision hinges on whether AI-powered guidance and the modern interface are worth £228/year.

Switching from FreeAgent to AccountsOS

If you're considering the switch, here's what to expect:

What Transfers Easily

• Transaction history (CSV export/import)
• Customer and supplier contacts
• Invoice records
• Basic financial data

What Requires Setup

• New bank statement imports (reconnect via CSV)
• AI learning your categorisation preferences
• Historical context about your business

Typical Switch Timeline

Most users complete migration in 2-3 hours. The AI learns your patterns within the first month of use. Keep FreeAgent accessible during transition for historical reference.

Things to Consider Before Switching

• Payroll: If you use FreeAgent payroll, set up standalone payroll first
• Time tracking: Export project data, find alternative time tracking if needed
• Bank feeds: Prepare for CSV import workflow
• Accountant access: Inform your accountant about the switch

Pros and Cons Summary

FreeAgent Pros

• Free for NatWest/RBS/Ulster customers
• Excellent payroll integration
• Time tracking and project costing
• 350+ bank feed connections
• Mature, well-tested platform
• Strong accountant collaboration tools
• Comprehensive invoicing

FreeAgent Cons

• £34.80/month for non-NatWest customers
• Traditional software learning curve
• No AI assistant or voice commands
• No proactive tax optimisation
• Owned by a bank (potential conflicts)
• Interface feels dated compared to modern apps

AccountsOS Pros

• Simple £19/month pricing (no VAT)
• No learning curve - just chat
• AI-powered tax guidance
• Voice commands for hands-free use
• Unlimited AI receipt scanning
• Modern, intuitive interface
• Built specifically for UK Ltd directors

AccountsOS Cons

• No integrated payroll yet
• CSV bank import (not direct feeds)
• Fewer third-party integrations
• Newer platform (less track record)
• No time tracking features
• No free tier with bank partnerships

The Bottom Line

FreeAgent is established, feature-rich accounting software with excellent payroll and time tracking. If you bank with NatWest Group, getting it free makes it hard to argue against. For service businesses billing by the hour, FreeAgent's project features are genuinely useful.

AccountsOS represents a fundamentally different approach: AI-native accounting that eliminates the learning curve entirely. For founders who dread accounting software and just want instant answers about their finances, AccountsOS delivers. The £19/month flat rate (vs £34.80/month) provides significant savings for non-NatWest customers.

The right choice depends on your priorities:

• Free software (NatWest customer): FreeAgent
• Time tracking and projects: FreeAgent
• Integrated payroll: FreeAgent
• Lowest cost (non-NatWest): AccountsOS
• Simplest experience: AccountsOS
• AI-powered tax guidance: AccountsOS
• Voice commands and modern interface: AccountsOS

Try AccountsOS free for 14 days and experience the difference between traditional accounting software and simply asking questions about your finances. Or explore our salary calculator and VAT calculator to see how we approach UK tax guidance. Learn more about how AccountsOS works for UK limited company directors.

Frequently Asked Questions

Is FreeAgent good for UK limited companies?

FreeAgent is well-designed for UK limited companies with solid MTD compliance, Corporation Tax tracking, and integrated payroll. Its UK-native development means features genuinely fit UK requirements. However, it lacks proactive tax optimisation - it tracks your numbers but doesn't advise on efficiency. For many directors, AccountsOS's AI guidance provides more actionable value, though FreeAgent's free tier for NatWest customers is compelling.

How much does FreeAgent actually cost?

FreeAgent costs £29/month plus VAT, making the real price £34.80/month or £417.60/year. It's free for NatWest, RBS, Ulster Bank, and Mettle business account holders. AccountsOS costs £19/month (no VAT to add), saving £189.60/year compared to FreeAgent's standard pricing.

Can I switch from FreeAgent to AccountsOS?

Yes, switching is straightforward. Export your transaction history, contacts, and invoice data from FreeAgent as CSV files. Import into AccountsOS. Set up bank statement imports for your accounts. Most users complete migration in 2-3 hours whilst keeping FreeAgent accessible for historical reference.

Does FreeAgent include payroll?

Yes, FreeAgent includes basic payroll at no extra cost. It handles PAYE, National Insurance, pension auto-enrolment, and RTI submissions to HMRC. This works for both directors and employees. AccountsOS payroll is currently in development, so FreeAgent has a clear advantage if you need integrated payroll now.

Is FreeAgent MTD compliant?

Yes, FreeAgent is fully HMRC-recognised for Making Tax Digital. It supports MTD VAT with direct submission to HMRC and is preparing for MTD for Income Tax when it launches in April 2026. AccountsOS is also fully MTD compliant, so both platforms meet HMRC's digital record-keeping requirements.

What's the difference between FreeAgent and AccountsOS?

FreeAgent is traditional cloud accounting software with dashboards, menus, and manual navigation. AccountsOS is AI-native accounting where you chat with your books in plain English. FreeAgent has more features (payroll, time tracking, project costing). AccountsOS is simpler, cheaper, and provides proactive tax guidance rather than just tracking.

Should I get FreeAgent free through NatWest?

If you already bank with NatWest Group, absolutely use the free FreeAgent access. If you're considering switching banks to get free FreeAgent, calculate carefully. Business account fees may offset savings, and AccountsOS at £19/month may cost less than switching banks whilst providing better AI guidance.

Which is better for contractors - FreeAgent or AccountsOS?

Both work well for contractors. FreeAgent offers time tracking and project costing valuable for hourly billing. AccountsOS provides instant answers about IR35 implications, optimal salary/dividend splits, and expense allowability. FreeAgent is better for time-based billing; AccountsOS is better for tax optimisation guidance. Consider whether you need detailed time tracking or AI-powered advisory.

Ready to experience AI-native accounting? Start your free 14-day AccountsOS trial - no credit card required. Import your FreeAgent data in minutes and discover a simpler way to manage your limited company finances.