CT600 Box by Box: The Income Section (Boxes 145-205) Explained
The income section of the CT600 is where you tell HMRC how much your company earned. Getting these boxes right is critical — errors here affect your entire tax calculation.
Box 145: Turnover / Business Income
This is your company's gross trading income for the period. Include:
- Sales revenue
- Fees for services
- Commission income
Don't include: Investment income, property income, or chargeable gains — those go in separate boxes.
Box 150-155: Income from Trading
- Box 150: Trading profits (after deducting allowable expenses)
- Box 155: Net trading profits after capital allowances
These boxes represent your adjusted trading profit — revenue minus allowable business expenses minus capital allowances.
Box 160-175: Losses
- Box 160: Trading losses brought forward from previous periods
- Box 165: Trading losses of this period set against total profits
- Box 170: Non-trading loan relationship profits and gains
- Box 172: Tick if income at box 170 is stated net of tax
- Box 175: Trading losses carried forward to future periods
Box 190: Property Business Income
Income from UK or overseas property your company owns:
- Rental income (net of allowable property expenses)
- Lease premiums
- Service charge income
This is the profit from property, not gross rent — deduct mortgage interest, repairs, management fees, and other allowable property expenses first.
Box 195-200: Other Income
- Box 195: Non-trading gains on intangible fixed assets
- Box 200: Tonnage tax profits (shipping companies only)
- Box 205: Income not falling under any other heading
Box 205 is a catch-all for miscellaneous income that doesn't fit elsewhere — royalties received, compensation receipts, etc.
Box 235: Total Income
This should equal the sum of all income boxes:
- Trading profits + Property income + Non-trading income + Chargeable gains = Total income
Taxpipe calculates this automatically.
Common Mistakes
- Including VAT in turnover — Box 145 should be net of VAT (if VAT-registered)
- Putting gross rent in Box 190 — this should be net property profit, not gross rental income
- Forgetting bank interest — even small amounts of bank interest count as non-trading income (Box 170)
- Missing the loss boxes — if you have brought-forward losses, claiming them here reduces your tax bill
Filing your CT600? Taxpipe guides you through every box with clear explanations. £59, no accountant needed.