Property Company Accounting
How to file a CT600 for a property company with TinyTax. Covers rental income, property expenses, and Box 170.
How do you file a CT600 for a property company on TinyTax? This guide covers what's different about property companies, which fields to use, and how property losses work.
Setting Up Your Property Company Filing
When starting your CT600, select Property Company as the company type:
Company
What type of company is this?
Select the company type that matches your situation. This affects which fields appear.
Choose Property Company if your company's main income is from letting or renting property. This changes the form to show property-specific fields.
What's Different for Property Companies?
The form layout is mostly the same as for trading companies, with these key differences:
| Aspect | Trading Company | Property Company |
|---|---|---|
| Income field | Turnover (Box 145) | Property rental income (Box 190) |
| Net profit box | Box 165 (Net trading profits) | Box 190 (Income from property business) |
| Losses label | Losses | Property Losses |
| Losses brought forward box | Box 160 | Box 250 |
Entering Your Figures
Income
Enter your total rental income in the Property rental income field. This is the gross rent received before deducting expenses.
Expenses
Enter your costs in the standard P&L expense fields:
| Field | Property company examples |
|---|---|
| Cost of raw materials and consumables | Materials for minor repairs you do yourself |
| Staff costs | Property manager salary, cleaner wages |
| Depreciation | Depreciation on fixtures, furniture, equipment |
| Other charges | Agent fees, insurance, repairs, mortgage interest, legal fees, utility bills (if landlord-paid), advertising for tenants |
Capital Allowances
The Annual Investment Allowance (AIA) is available for property companies. You can claim AIA on:
- Furniture and furnishings in rental properties
- Tools and equipment
- Vehicles used for the property business
- Fixtures (boilers, radiators, fitted kitchens in commercial properties)
Property Losses
Losses Brought Forward
If your property business made a loss in a previous year, enter the amount in the Property losses brought forward field (Box 250). This offsets against your current year's property income.
Current Year Losses
If your property income minus expenses produces a loss this year, TinyTax calculates this automatically. The loss carries forward to future years.
How Property Losses Differ from Trading Losses
Property losses can only be offset against future property income. Unlike trading losses, they cannot be:
- Set against other types of income (e.g., interest income) in the same period
- Carried back to previous periods
Common Scenarios
Single Rental Property
Situation: You own one buy-to-let property through a limited company.
How to file:
- Select Property Company
- Enter gross rent as Property rental income
- Enter agent fees, insurance, repairs, mortgage interest in Other charges
- Enter any staff costs if applicable
- Claim AIA for any qualifying equipment
Multiple Rental Properties
Situation: Your company owns several rental properties.
How to file: Same as above — combine the figures. Enter the total rental income across all properties, and the total costs.
Property With No Tenants (Void Period)
Situation: Your property was empty for part of the year.
How to file: Enter the rent received (for the occupied period). Costs incurred while the property was empty are still allowable expenses — include them in Other charges.
Property Company With Interest Income
Situation: Your property company has bank interest as well as rental income.
How to file: Enter rental income in Property rental income. Enter bank interest in the Interest income field (Box 170). Both are included in your taxable profit.
Common Questions
Q: My company has trading income AND rental income — which type do I choose? A: Choose Mixed Income (Advanced). This gives you access to both turnover (Box 145) and property income (Box 190) fields, plus a dedicated property expenses field.
Q: Where do I enter mortgage interest? A: In Other charges on the P&L. For limited companies, mortgage interest on buy-to-let properties is a fully deductible business expense. (The restriction on mortgage interest relief applies to individual landlords, not companies.)
Q: Can I claim capital allowances on a new kitchen? A: It depends. Replacing a like-for-like kitchen in a residential property is a revenue expense (Other charges). A new kitchen in a commercial property may qualify for capital allowances. If in doubt, consult your accountant.
Q: My property made a loss — can I offset it against my salary? A: No. Company losses and personal income are separate. The company's property loss carries forward against future property profits within the company.
Q: I renovated a property before letting it — where do those costs go? A: Pre-letting renovation costs are usually capital expenditure (they improve the property, not maintain it). They may not be deductible as a revenue expense. Consult your accountant for the correct treatment.
Still Have Questions?
If you're unsure about any aspect of your property company filing, get in touch.
Last updated: February 2026
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