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Using Simplified 3-Line Accounting for UK Property MTD ITSA Quarterly Returns

Shannon Brady
  • Updated

BrightBooks and BrightAP now support a Simplified 3-Line Accounting option for users with UK rental property businesses below the VAT threshold. This feature lets you submit quarterly MTD ITSA returns reporting total income and total expenses in a simplified way, while still separately reporting residential property interest and finance charges as required by HMRC.

 

Who Can Use Simplified 3-Line Accounting?

  • Users with UK Property business type whose annual income is below £90,000
  • Users not part of the Managing Serious Defaulters programme
 

Important:

  • You are responsible for confirming your eligibility — the system does not calculate turnover or enforce eligibility rules.
  • HMRC requires residential financial costs (interest and finance charges) to be reported separately due to Section 24 restrictions, even in 3-line mode.
  • No HMRC notification is sent when enabling or disabling this option.

How to Enable Simplified 3-Line Accounting

Accessing the Setting

  1. Go to Settings
  2. Select MTD for ITSA

  3. Open MTD Tax Setup

     

 
 

If your Business Type is set to UK Property, you will see a new checkbox:

 

  • Use simplified 3-line accounting (for property income below VAT threshold)
 
 

About the Setting

  • The option is unchecked by default (detailed accounting enabled).
  • You can enable or disable this at any time — before or after submitting returns.

  • When you change this setting after submissions, an information message will appear:

     

    "You have changed your accounting method. This is permitted by HMRC. Previous returns submitted using [previous method] will remain unchanged. Future returns will use [new method]."

  • Note: No turnover threshold or Managing Serious Defaulters validation is performed by the system.
 

What Does Simplified 3-Line Accounting Look Like for UK Property?

Quarterly Return Screen (3-Line Accounting Enabled)

MTD ITSA Quarterly Return (UK Property) - Q[X] 202X
Period: [DD/MM/YYYY] to [DD/MM/YYYY]
Simplified 3-Line Accounting (UK Property)
────────────────────────────────────────────
Total Property Income £ [________.__]
Tax Deducted from Property Income £ [________.__]
Rent a Room Exempt Amount £ [________.__]
Total Expenses £ [________.__]
 
Residential Property - Required Separate Reporting
────────────────────────────────────────────────────
Residential Financial Cost 💡 £ [________.__]
Residential Financial Cost Carried Forward 💡 £ [________.__]
────────────────────────────────────────────
Net Profit / (Loss) £ [________.__]
════════════════════════════════════════════════════
ℹ️ Interest and finance charges must be reported separately for residential properties, even when using 3-line accounting.
 
 

Contextual Help for Residential Financial Cost 💡

What counts as residential property interest?

  • Mortgage interest on residential rental properties
  • Loans for purchasing or renovating residential rental properties
  • Arrangement fees related to residential finance
 

These must be reported separately due to Section 24 tax restrictions.
Non-residential property interest (commercial, FHL) goes in consolidated expenses.

Calculations:

  • Total Property Income: Sum of all UK property income nominal groups
  • Tax Deducted: Tax deducted at source (entered separately)
  • Rent a Room Exempt Amount: Rent a room scheme exempt income entered separately
  • Total Expenses: Sum of all expenses excluding residential financial costs
  • Residential Financial Cost & Carried Forward: Manually entered amounts
  • Net Profit: Calculated as Income minus Rent a Room exempt amount, Total Expenses, Residential Financial Cost, and Carried Forward amounts

 

 

 

Generating Supporting Reports for 3-Line Accounting Returns

To view or print a supporting report that matches your simplified 3-line accounting submission:

 
  1. Navigate to General Ledger > MTD ITSA.
  2. Select the relevant return period.
  3. On the dropdown, you will see a Print/View option specifically for the 3-line accounting report format.
 

This report displays your quarterly return data in the simplified 3-line format, matching what was submitted to HMRC.

 
 

Additional Notes

  • You can switch between simplified and detailed accounting at any time, even after submission, with no transitional rules.
  • Previous returns keep the original accounting method; only future returns reflect changes.
  • No additional compliance or record-keeping requirements beyond HMRC rules.
  • Residential financial costs must always be separated in submissions.
 

FAQ

Q: Can I switch back and forth between simplified and detailed accounting?
A: Yes, freely at any time. Your previous submissions will remain unchanged.

 

Q: Does the system enforce eligibility or turnover thresholds?
A: No, eligibility is your responsibility. The system only provides guidance.

 

Q: What if I have a residential property interest but forget to enter it?
A: You will receive a warning to remind you that residential interest and finance charges must be reported separately.

 

Q: Does HMRC get notified when I enable or disable 3-line accounting?
A: No, no notification is sent to HMRC when toggling this setting.

 

If you require assistance or further information on the simplified 3-line accounting for UK Property returns, please contact our support team.