CT600 Box 410: Total Profits and the Financial Year Calculation Grid

CT600 Box 410 appears in the financial year calculation table on your company tax return. It records the corporation tax calculated on rate band 2 income falling within the second financial year of your accounting period. For the vast majority of small and medium-sized companies, this box will be zero — but understanding what it represents helps you verify that your CT600 has been completed correctly.

Where Does Box 410 Sit on the CT600?

Box 410 is part of the financial year calculation grid in Section 11 of the CT600. This grid exists because UK financial years run from 1 April to 31 March, and your company's accounting period may straddle two of them. When that happens, HMRC needs to know how much income falls into each financial year so the correct corporation tax rate can be applied to each portion.

The grid has two main sections: one for the first financial year (FY1) and one for the second financial year (FY2). Within each section, different types of income are broken out into separate rows — known as rate bands.

Box Range	Description
Boxes 330–345	FY1: Main trading profits
Boxes 350–360	FY1: Rate band 2 income
Boxes 365–375	FY1: Rate band 3 income
Boxes 380–395	FY2: Main trading profits
Boxes 400–410	FY2: Rate band 2 income
Boxes 415–425	FY2: Rate band 3 (other income)
Box 430	Total corporation tax

Box 410 is the tax column in the FY2 rate band 2 row — specifically the corporation tax calculated on whichever rate band 2 income your company has in the second financial year.

What Is Rate Band 2?

Rate band 2 in the CT600 typically covers franked investment income (FII) — dividends received from other UK companies on which corporation tax has already been paid. In some circumstances it can also relate to ring fence profits (for oil and gas companies), though this is far less common.

For most small and micro-entity companies:

You do not receive dividends from other UK companies that qualify as FII
Your company does not extract oil or gas on the UK Continental Shelf
Box 410 will therefore be zero

Rate band 2 income is covered in detail in our guide to CT600 Box 400: Franked Investment Income, which explains what FII is and when it arises.

How Box 410 Is Calculated

Within the FY2 rate band 2 row, there are three boxes:

Box	Description
Box 400	Amount of rate band 2 income (e.g. FII)
Box 405	Rate of corporation tax applicable to that income
Box 410	Tax calculated: Box 400 × Box 405 rate

Box 410 is therefore a straightforward multiplication: the amount of income in Box 400, multiplied by the tax rate in Box 405.

If your company has no franked investment income or ring fence profits, Box 400 will be zero, Box 405 will be blank, and Box 410 will be zero.

Worked Example

Suppose a company's accounting period runs from 1 January to 31 December, straddling two financial years. The company received franked investment income of £20,000 during the part of its accounting period that falls in FY2.

Box	Value
Box 400 (FII in FY2)	£20,000
Box 405 (tax rate)	25%
Box 410 (tax on FII)	£5,000

This £5,000 would then contribute to Box 430 (total corporation tax before reliefs) alongside the tax calculated on trading profits and other income.

In practice, most small company tax returns are processed entirely by software, and Box 410 is populated automatically based on the figures you enter elsewhere.

How Box 410 Relates to Box 430

Box 430 (Corporation Tax) represents the total tax calculated on all categories of income across both financial years. It is derived by summing the tax from each rate band row:

Box 430 = Box 345 + Box 360 + Box 375 + Box 395 + Box 410 + Box 425

Tax Component	Box
FY1 main rate tax	Box 345
FY1 rate band 2 tax	Box 360
FY1 rate band 3 tax	Box 375
FY2 main rate tax	Box 395
FY2 rate band 2 tax	Box 410
FY2 rate band 3 tax	Box 425
Total	Box 430

Box 430 then flows into the wider tax calculation, where marginal relief (if applicable) is deducted to arrive at the CT chargeable amount shown in CT600 Box 440.

When Does Box 410 Have a Non-Zero Value?

Box 410 will only contain a figure if all three of the following are true:

Your accounting period spans two UK financial years — meaning it starts before 1 April and ends after 31 March, or vice versa
Your company has rate band 2 income — specifically franked investment income from UK company dividends that are chargeable to corporation tax, or ring fence profits
Some or all of that income falls in the second financial year — meaning the income is apportioned to the FY2 portion of your accounting period

If your accounting period falls entirely within one financial year (for example, 1 April to 31 March), there is no FY2 section and Box 410 does not apply.

Most Companies Can Ignore Box 410

The rate band 2 section of the CT600 is primarily relevant to:

Large companies that hold shares in other UK companies and receive dividends subject to corporation tax
Holding companies within a group structure, where inter-company dividends may qualify as FII
Oil and gas companies with ring fence profits

For a typical small or micro-entity company — a sole director limited company, a small service business, or a trading company — Box 410 will almost always be zero. Your CT600 software will handle this automatically and leave it blank or zero.

Box 410 and Total Profits

It is worth clarifying the relationship between Box 410 and the concept of total profits on the CT600.

The company's total chargeable profits — the overall figure on which corporation tax is calculated — appears in Box 315 of the CT600. This is the starting point for the entire tax calculation.

The financial year calculation grid (where Box 410 sits) takes those profits and breaks them down by financial year and income type. Box 410 is not a profits figure — it is the tax calculated on a specific subset of profits. The grid exists to apply the correct tax rate to each category of income, accounting for the fact that rates may differ between financial years or income types.

Understanding this distinction makes it easier to review your CT600 and check that the figures in the tax calculation section are consistent with the profit figures earlier in the form.

Checklist: Box 410 on Your CT600

When reviewing your CT600, check the following:

Does your accounting period straddle two UK financial years? If not, Box 410 is not applicable.
Does your company have franked investment income or ring fence profits? If not, Box 410 should be zero.
If Box 400 has a value, does Box 410 correctly reflect the tax on that amount at the Box 405 rate?
Does Box 430 equal the sum of Boxes 345, 360, 375, 395, 410, and 425?

If you are using CT600 software, these calculations are handled automatically. Manual review is mainly useful if you are checking a return produced by someone else or investigating an HMRC query.

For a complete picture of how Box 410 fits into the broader tax calculation, see:

CT600 Box 400: Franked Investment Income Explained — what goes into rate band 2 income
CT600 Box 440: Corporation Tax Payable — where the calculation leads
CT600 Boxes Explained: Complete Guide — overview of all CT600 boxes

Summary

CT600 Box 410 records the corporation tax calculated on rate band 2 income (primarily franked investment income) falling within the second financial year of your accounting period. For most small companies, this box is zero because they do not have franked investment income or ring fence profits. Where it does apply, Box 410 contributes to Box 430 (total corporation tax), which in turn feeds into the final corporation tax payable figure in Box 440.