> For the complete documentation index, see [llms.txt](https://www.zerabooks.com/help/llms.txt).
# Company settings
The company's name, currency, number format and tax number, plus the business context ZeraBooks reads when it categorizes, the fiscal year, and opening books.
## Open Settings
1. Click the company name at the top of the left navigation to open the company menu.
2. Click **Settings** (or press G then S).
The left side of Settings has two groups. Under the company's name: **Company** and **Bookkeeping**. Under **Your account**: **Profile**, **Security** and **Billing**. Company settings apply to the company you're working in; switch companies first to change another one's. Click **Back to Dashboard** to leave.
## Company
**Company** shows the company's details:
| Setting | What it does |
| --- | --- |
| **Books currency** | The currency of the books and reports. "Locked once the books have their first transaction." |
| **Number format** | How amounts and dates are punctuated, for example $1,234.56 or 1.234,56 €. Never locked. |
| **Tax registration number** | "Printed on the invoices this company sends." |
| **Contact email** | The company's contact address. Optional. |
To change them, click the pencil (**Edit company**). Edit the **Business name**, **Contact email**, **Books currency**, **Number format** or **Tax registration number**, then click **Save**. See [Currency and region](https://www.zerabooks.com/help/getting-started/currency-and-region).
## Invoice details
Under the company card, **Invoice details** holds the logo, business address, phone, invoice email, website and footer printed on every invoice this company sends. Click **Upload logo** for a PNG, JPEG or SVG up to 2 MB, fill in the fields, then click **Save invoice details**. See [Invoice branding](https://www.zerabooks.com/help/invoices/invoice-branding).
## Bookkeeping
### Business context and fiscal year
1. Click **Bookkeeping**.
2. In **Business context**, describe what the business sells, how it gets paid and what it usually buys (up to 1,000 characters). ZeraBooks reads this every time it categorizes a transaction, so a clear description means fewer corrections.
3. Choose the **First month of the fiscal year**. Match the fiscal year of your existing financial statements.
4. Click **Save company context**.
{% hint style="warning" %}
**Important:** The fiscal year is "Protected once the books have activity." Set it before your first statement or transaction.
{% endhint %}
### Opening books
The **Opening books** card shows how the company's books started, with the link you need next:
- **Continue setup**: the company's setup isn't finished.
- **Resume opening books**: you chose existing books but haven't brought the balances over yet. See [Move your books to ZeraBooks](https://www.zerabooks.com/help/getting-started/move-your-books-to-zerabooks).
- **View opening-book record**: the balances were imported. See [Review, import and undo opening books](https://www.zerabooks.com/help/getting-started/review-import-and-undo-opening-books).
- **Actually, this business has earlier activity**: the company started fresh and has no activity yet. Use it to go back and choose another starting point.
### Past categorization
Once the company has books, **Past categorization** › **Import past categorization** teaches ZeraBooks from how the business was categorized before. It learns the patterns without adding transactions or changing any balance.
## Frequently Asked Questions
Where do I change the company's currency?
**Settings** › **Company** › **Edit company**, before the books have their first transaction. After that, the currency is locked.
How does ZeraBooks learn about my business?
From the **Business context** in **Settings** › **Bookkeeping**, which it reads every time it categorizes a transaction, and from every correction you make.
Can I change the start of my fiscal year?
Yes, until the books have activity. Change **First month of the fiscal year** in **Settings** › **Bookkeeping** and click **Save company context**. Once there's activity, it's protected.
Why is the fiscal year greyed out?
The books already have activity, so the fiscal year is protected. It shows "Protected once the books have activity."
Where does the tax registration number appear?
On the invoices this company sends.
I only see Profile, Security and Billing. Where are the company settings?
No company is selected. Choose a company from the company menu or **View All Clients**, then open Settings again.
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