CT600 for Property Developers: Complete Guide

Property development companies have unique CT600 considerations. Unlike property investment (rental income), development is a trade - which affects how profits are taxed and reported.

Property Developer vs Property Investor

Key Distinction

Aspect	Developer (Trading)	Investor (Rental)
Activity	Buy, develop, sell	Buy, hold, rent
Income type	Trading income	Property income
CT600 box	Box 150	Box 190
Stock treatment	Trading stock	Capital asset
Gain on sale	Trading profit	Capital gain

Why It Matters

Property developers have:

All profits taxed as trading income
No capital gains treatment
Different loss relief options
Stock valuation requirements

Trading Income for Developers

Box 150: Gross Trading Income

Development profits go in Box 150:

Sales proceeds from completed developments
Profit recognised on long contracts
Any related trading income

Calculating Development Profits

``` Sale proceeds

Land cost
Construction costs
Professional fees
Finance costs (development period)
Sales costs

= Development profit ```

Development Costs

Allowable Expenses

Cost	Treatment
Land purchase	Part of stock cost
Construction	Part of stock cost
Architect fees	Part of stock cost
Planning fees	Part of stock cost
Building regulations	Part of stock cost
Interest (during development)	Often capitalisable
Legal fees (purchase/sale)	Deductible
Marketing/sales costs	Deductible

Stock Valuation

Unsold developments are trading stock:

Valued at lower of cost or net realisable value
Cost includes land + construction + fees
Affects profit calculation

Work in Progress

Development WIP

Long-term developments create WIP:

Multi-year projects
Costs incurred before sale
May need partial profit recognition

CT600 Treatment

Stage	Treatment
Land held for development	Stock at cost
Development in progress	WIP at cost
Completed, unsold	Stock at lower of cost/NRV
Sold	Profit recognised

Finance Costs

Interest Deductibility

Development interest may be:

Capitalised (added to development cost)
Expensed (deducted when incurred)

Capitalisation Rules

Interest can typically be capitalised if:

Directly attributable to development
During the development period
Before units are ready for sale

Example

Period	Interest	Treatment
During construction	£50,000	Capitalise (add to cost)
After completion	£10,000	Expense (deduct)

Multi-Unit Developments

Recognising Profit

For developments with multiple units:

Can recognise profit as units sell
Or wait until project complete
Must be consistent

Example: 10 Unit Development

Item	Amount
Total costs	£2,000,000
Cost per unit	£200,000
Sale price per unit	£300,000
Profit per unit	£100,000

As each unit sells, profit is recognised in Box 150.

Common Developer Scenarios

Buy, Renovate, Sell

Phase	CT600 Impact
Purchase	Stock at cost
Renovation	Add to stock cost
Sale	Box 150 profit

Ground-Up Development

Phase	CT600 Impact
Land purchase	Stock at cost
Planning	Add to stock cost
Construction	Add to stock cost
Sale	Box 150 profit

Mixed Development (Some Retained)

If you develop units and keep some for rental:

Sold units: Trading profit (Box 150)
Retained units: Transfer to investment (Box 190 income)
Transfer value: Market value at transfer

Tax Planning for Developers

Timing of Profit Recognition

Developers can sometimes influence when profit is recognised:

Complete sale before year end = this year's profit
Complete after year end = next year's profit
Must not be artificial

Loss Years

If a development makes a loss:

Trading loss relief available
Can offset against other profits
Can carry back or forward

Associated Companies

Multiple development companies?

Associated company rules apply
Affects Corporation Tax rate thresholds
Consider group structure

CT600 Filing Example

Development Company Scenario

Project Summary:

5 houses developed and sold
Total sales: £1,500,000
Land cost: £400,000
Construction: £650,000
Other costs: £150,000
Capitalised interest: £50,000

Profit Calculation:

Item	Amount
Sales	£1,500,000
Less: Land	(£400,000)
Less: Construction	(£650,000)
Less: Other costs	(£150,000)
Less: Capitalised interest	(£50,000)
Trading profit	£250,000

CT600:

Box	Amount
150	£1,500,000
155	£250,000
165	£250,000
300	£250,000
315	£62,500 (at 25%)

When Using TinyTax

TinyTax handles property developer CT600s:

Trading income goes in the normal income section
Development costs are deducted as expenses
Profit flows to correct CT600 boxes
Tax calculated automatically

For complex multi-year projects, consider professional accounting advice for WIP valuation.

Need Help?

TinyTax makes CT600 filing straightforward for property developers. Enter your income and costs, and the software handles the rest.

Start Your CT600 Filing →