# Corporation Tax

Source: https://docs.neropay.app/nerobooks/corporation-tax-and-tax-dates
Last updated: 2026-09-21T16:49:59+00:00

Turn approved bookkeeping into a dated Corporation Tax estimate you can keep and hand to your accountant.

Beside it sit a task list for year-end work and a timeline of the dates you have confirmed.

> ⚠️ **Warning:** This is an estimate and a working paper, not a tax return, and not tax advice. NeroBooks does not produce or submit a CT600, statutory accounts or anything to Companies House. Have your accountant check the figures before you rely on them.

### Who it is for

| Requirement | Detail |
| --- | --- |
| Company type | UK-resident trading limited company, no ring-fence activities |
| Accounting periods | 01-04-2023 to 31-03-2027 |
| Period length | twelve months or less |
| Currency | GBP only |

A short period crossing financial years of different lengths needs its own computation and cannot be estimated here.

### Before you can save one

Set your accounting period and select **Review period**. Three tiles tell you whether your records are ready.

| Tile | What it tells you |
| --- | --- |
| Bookkeeping profit / (loss) | profit from approved GBP entries in the period |
| Entries needing attention | drafts must be reviewed first |
| Posted non-GBP entries | must be resolved — the calculation is GBP only |

> 💡 Note: If either of the last two shows a count, deal with it first. The estimate will not save while unreviewed drafts or non-GBP entries sit in the period.

### The adjustments

**＋ Create tax estimate** opens a form. Every figure is one you have reviewed — NeroBooks does not decide the tax treatment of anything.

| Field | What to enter |
| --- | --- |
| Associated companies | how many other companies are associated, not counting this one |
| Disallowable expenses to add back | costs tax rules do not allow |
| Depreciation / amortisation to add back | depreciation is not a tax deduction |
| Other reviewed tax additions | anything else that increases the taxable figure |
| Non-taxable income in the accounts | income that is not taxable |
| Reviewed capital allowances | relief claimed on equipment and capital spending |
| Other reviewed tax deductions | anything else that reduces it |
| Eligible losses used | losses set against this period |
| Exempt distributions in augmented profits | marginal relief only |
| Adjustment notes and evidence | why each figure is what it is — your accountant will read this |

Two ticks confirm the company qualifies and your bookkeeping is complete and reviewed. **Save estimate** keeps it.

> ⚠️ **Warning:** Do not add the same cost back twice. Depreciation is suggested from your depreciation account, so check it is not already counted elsewhere.

### Saved estimates

Each is a dated snapshot. It does not update when the bookkeeping changes, so make a new one after you change entries or adjustments. Estimates export as PDF, CSV or Excel.

### Year-end tasks

**Preparation & review** is an internal task list. Add a company secretarial task or a bookkeeping review, give it a due date, and track it.

Filter by work type — Corporation Tax preparation, company secretarial task or bookkeeping review — and by status. The four statuses are **Draft**, **In review**, **Reviewed · not filed** and **Closed internally**.

> 💡 Note: Finishing a task here submits nothing, updates no register and certifies nothing. It is your own record of what has been done.

### Tax timeline

**Tax timeline** holds dates you have confirmed yourself. NeroBooks does not work out your deadlines — take each one from your HMRC or Companies House account.

| Field | What to enter |
| --- | --- |
| Name / description | what the date is for — required |
| Due Date | the date from the official notice — required |
| Completed | tick once you have checked it with the authority |
| Notes | reference numbers or anything you will want later |

The account owner can switch on email reminders in [Settings](https://docs.neropay.app/nerobooks/settings-access-and-practice). They go out up to seven days before a saved date and shortly after.

### Frequently asked questions

**Is the estimate my tax bill?**

No. It comes from figures you entered and adjustments you chose. Your accountant works out and files the real liability.

**Why will it not save?**

Check the readiness tiles. Unreviewed drafts or posted non-GBP entries both block it.

**Do saved estimates update?**

No. Each is a snapshot. Make a fresh one after changing the bookkeeping or adjustments.

**Where do deadlines come from?**

Your HMRC and Companies House accounts, or your accountant. NeroBooks stores what you enter and works nothing out.

**Can it file the return?**

No. CT600 and iXBRL submission, statutory accounts and Companies House filing are all outside NeroBooks.

*This article explains how NeroBooks works. It is general information about the software, not accounting, tax or financial advice. Nero Panda Ltd, trading as NeroPay, is not a tax agent, accountancy firm or financial adviser.*

*Still need help? Contact us at support@neropay.app or create a ticket.*