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HMRC-Recognised Software

Joint Property, Multiple Owners. Split Profit Automatically.

Manage rental income and expenses for jointly owned properties with automatic profit
allocation built in.

Whether you own jointly with your spouse, family members, or multiple investors and whether your split is 50:50, 60:30:10, or completely custom RentalBux handles it. Set your ownership percentages once and RentalBux calculates each owner's share accurately.

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Set once, auto-split forever
No spreadsheets
Separate MTD per owner
Any split ratio
HMRC-recognised
Rated 5.0 on Trustindex Trustindex

"If you're managing joint property, Rentalbux is a game-changer. It makes splitting income and expenses effortless and allows you to assign profit shares across multiple properties in just a few clicks. The platform is intuitive, saves you time, and ensures everything stays transparent and organised, perfect for upcoming MTD compliance. Save yourself the headache of manual calculations and let Rentalbux handle the hard work."

Joshua

Joint landlords, Birmingham

December 2025

3 Properties
60/40 Ownership
Verified
Illustrative customer photo
Actual Customer Testimonial, Photo is for Illustrative purpose only.

Shared property. Manual splits.
Double the work. There’s a better way.

Own rental property with your spouse, partner, or business associate? Stop managing two separate accounts. RentalBux automatically splits rental income, expenses, and MTD submissions based on your ownership percentages-whether 50:50, 45:35:30, or any custom arrangement.

The Challenge

  • Two subscriptions required
  • Manual transaction splitting
  • Calculation errors and HMRC penalties
  • Double the admin, double the cost

The RentalBux Solution

  • One subscription covers up to three Owners
  • Set your split once, auto-split forever
  • Accurate, auditable HMRC-compliant
  • Half the work, full compliance

Set Up Joint Ownership in Minutes.

Allocate properties, assign ownership percentages, and
automate your reporting all in one place.

Under Making Tax Digital (MTD), each co-owner must report their individual share of rental income and expenses to HMRC quarterly. RentalBux handles this automatically set up once, and every transaction, report, and submission is split correctly.

Step 1

Add Co-Owners & Set Ownership Percentages

Easily add multiple property co-owners and define each person's ownership percentage

01

Add Co-Owners

Set ownership percentages

02

Assign Properties

Link properties to owners

03

View Reports

Individual owner reports

04

Submit to HMRC

MTD compliant filing

Set Your Split Once.
RentalBux Handles the Rest.

Accurate profit allocation, effortless quarterly reporting, and full compliance with HMRC's MTD ITSA automatically.

Automatic Profit Splits

Rental income and expenses are automatically divided between all co-owners based on the percentages you set. No manual intervention required.

Instant Separate Reports

Generate separate income and tax reports for each co-owner instantly. No manual tracking or duplication.

HMRC MTD ITSA Compliant

Full compliance with Making Tax Digital for Income Tax Self Assessment. Submit each co-owner's share directly to HMRC with a few clicks. No spreadsheets, no errors.

Who Benefits from Automatic
Profit Splits?

Whether you own property with a spouse, business partner, or family member - RentalBux splits income, expenses, and MTD submissions automatically.

Married Couples and Civil Partners

You and your spouse/partner own rental property jointly. HMRC allows you to elect for unequal profit shares if you own the property as tenants in common. RentalBux automatically calculates and reports each partner's share, ensuring your MTD submissions reflect the correct ownership percentages.

Married couple reviewing paperwork together (joint property ownership)

Business Partners

You own multiple properties with a business associate on a 60:/40 or 70:/30 basis. Instead of maintaining two separate accounting systems, RentalBux automatically splits all income and expenses, giving each partner a clear, accurate record for their tax return.

Family at home representing family property investment

Family Investments

You have invested in property with a parent, sibling, or adult child. Each co-owner needs their own MTD submission, but managing this manually is time-consuming and error-prone. RentalBux handles the split for you - reducing admin and ensuring compliance.

Married couple illustration for joint property ownership

How RentalBux Compares to
Other Solutions

Compare the RentalBux joint ownership solution vs. maintaining two separate accounts with traditional property management software.

Feature Spreadsheets Other accounting software RentalBux
Automatic profit splits
Manual calculation required
Not supported or requires two accounts
Fully automated
MTD ITSA compliance
No integration
Limited or requires bridging software
Direct submission to HMRC
Separate reports for each owner
Manual export and formatting
Possible but time consuming
Generated automatically
Cost for joint owners Free but high admin burden £20+ per month per owner One subscription covers up to three owners
Audit trail and accuracy
Prone to errors
Depends on manual setup
Fully auditable and accurate

Start Free - See the Difference Yourself

Experience the power of automated profit splits and MTD-compliant reporting. No credit card required.

Get Started Free

FAQ for Joint Ownership & Profit Splits

Common questions about managing jointly owned rental properties and automatically splitting income, expenses, and MTD submissions between co-owners.

RentalBux makes joint ownership simple. Set ownership percentages for each property once during setup, and the system automatically splits all rental income and expenses according to those percentages. Each co-owner gets their own accurate reports and separate MTD submissions no manual calculations required.
Yes -each property in your portfolio can have its own ownership structure. You might own Property A 50:50 with your spouse, Property B 60:40 with a business partner and Property C 40:35:25 with two other investors. RentalBux tracks each property's ownership separately and calculates profit splits accordingly.
Yes. For married couples and civil partners who own property as tenants in common, you can set unequal profit shares to reflect an HMRC Form 17 election. Simply set your specified ownership percentages (e.g., 70:30 instead of the default 50:50), and RentalBux automatically splits income and expenses accordingly.
RentalBux tracks each co-owner's share regardless of their individual MTD status. If one owner needs to submit MTD quarterly returns and another doesn't (e.g., income below the threshold), each receives the appropriate reports for their tax situation. The system accommodates different MTD requirements for different owners.
Yes. RentalBux handles joint ownership splits for both UK and overseas rental properties. Each co-owner receives their percentage share of foreign rental income and expenses, ensuring correct reporting to HMRC. Foreign property income is tracked separately for accurate tax reporting.
Under Making Tax Digital for Income Tax Self Assessment (MTD ITSA), each co-owner must submit their own quarterly updates to HMRC. RentalBux generates separate MTD submissions for each owner automatically one click per owner, no duplicate data entry required.
Joint tenants own property equally (50:50) and cannot hold different shares. Tenants in common can own unequal shares (e.g., 60:40 or 70:30) based on their beneficial interest. The ownership structure can be set up either directly with the Land Registry or via a Deed/Declaration of Trust. Please note: for spouses and civil partners, if Form 17 hasn't been submitted to HMRC, the default profit split of 50:50 applies irrespective of the actual ownership percentage. RentalBux supports both structures simply set your ownership percentages to match your legal arrangement.
Form 17 is an HMRC form that allows married couples and civil partners to declare an unequal split of rental income for tax purposes. By default, HMRC assumes spouses share rental income 50:50 even if the property is owned in different proportions. If you own property as tenants in common with unequal shares (e.g., 70:30) and want your tax returns to reflect this, you must submit Form 17 to HMRC along with evidence of your beneficial interest (typically a Deed of Trust or Declaration of Trust). Once Form 17 is accepted, you can set your ownership percentages in RentalBux to match and the system will automatically split income and expenses accordingly for each owner's MTD submissions.
Form 17 must be submitted to HMRC within 60 days of the declaration date. You'll need to include evidence of your beneficial interest, such as a Deed of Trust or Declaration of Trust. The form can be posted to HMRC it cannot be submitted online. Once HMRC accepts your Form 17, update your ownership percentages in RentalBux to reflect the new split.
Each co-owner must report their individual share of rental income and expenses to HMRC separately. Under Making Tax Digital for Income Tax Self-Assessment (MTD ITSA), each owner submits their own quarterly updates. RentalBux calculates each owner's share automatically and generates separate MTD submissions no manual splitting required.
Each co-owner must register for MTD individually if their total qualifying income (including their share of rental income) exceeds the MTD threshold. RentalBux tracks each owner's share separately, making it easy to determine who needs to register and submit quarterly updates.
For married couples, HMRC applies a default 50:50 split of rental income regardless of who paid the deposit or mortgage. To declare a different split (e.g., 70:30), you must own the property as tenants in common and submit Form 17 to HMRC. RentalBux supports any split ratio and generates separate tax reports for each spouse.
Beneficial ownership refers to who is entitled to the profits from a property, which may differ from legal ownership. For example, a property might be legally owned 50:50, but a Deed of Trust could specify a 70:30 beneficial interest. For tax purposes, HMRC taxes rental income based on beneficial ownership. RentalBux lets you set ownership percentages to reflect your beneficial interest.
If one co-owner pays an expense (e.g., repairs or insurance), RentalBux still allocates the deduction according to your ownership percentages. Each owner's report reflects their share of all income and expenses regardless of who physically made the payment.
No. You can set up joint ownership on any number of properties in your RentalBux portfolio. Each property can have its own unique ownership structure and split percentages.
Under MTD ITSA, all landlords must report based on the standard tax year (6 April to 5 April). However, each co-owner's personal tax situation may differ. RentalBux generates separate reports for each owner, ensuring everyone has accurate figures for their individual tax return.
Yes. Section 24 restricts mortgage interest relief to the basic rate (20%) for individual landlords. Each co-owner receives their share of the restricted relief based on their ownership percentage. RentalBux calculates Section 24 adjustments automatically for each owner.
Yes. RentalBux supports joint ownership between any co-owners spouses, civil partners, family members, friends, or business partners. Simply set your ownership percentages and RentalBux handles the rest.

Ready to Simplify Your Joint Ownership Accounting?

Join landlords who have automated their profit splits and MTD reporting with RentalBux. Start your free today — no credit card required.

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Resources, Tips & Guides for Landlords and Sole Traders

More Resources
Self Assessment deadlines: When to register, file and make a payment in 2025/26
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Making Tax Digital legislation: what exactly is it?
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