The problem with wearing multiple hats

A lot of Australian sole traders run more than one business. A bookkeeper who also does tax returns under a different ABN. A tradesperson with a maintenance side hustle. A consultant who’s also selling an online course. It’s common. And it’s quietly annoying when you use ChatGPT for both.

You open a new chat to draft a quote for your cleaning business. ChatGPT responds like you’re a marketing consultant, because that’s what you told it you were, six months ago in a custom instructions field you’ve since forgotten about. Or it gives you something totally generic because it has no idea which business you’re working in today.

The tool isn’t broken. It just doesn’t know which hat you’re wearing. And by default, nothing tells it.

What’s actually happening under the hood

ChatGPT doesn’t have continuous memory the way a human assistant would. Each new conversation starts mostly fresh. When Memory is on (it is by default on paid plans), it can pull in details saved from past chats, but it decides what’s relevant, and “relevant” is fuzzy. It might remember your preference for bullet points. It might not remember that you run two completely different businesses with different tones, different audiences, and different jargon.

Custom instructions, the text you enter under Settings → Personalization, apply globally, to every chat you start. There’s one set of instructions. One version of you. If you’ve written those instructions around Business A, every response is filtered through that lens, whether you’re working on Business A or Business B.

This is fine if you’re one person with one clearly defined context. For multi-business operators, it’s a bit of a mess.

The Projects fix, separate context for each business

ChatGPT Projects (available on Plus and above) lets you create isolated workspaces inside ChatGPT. Each project has its own name, its own instruction set, and its own file attachments. Chats inside a project stay inside that project, they can reference each other, but they don’t bleed into your regular ChatGPT chats or other projects.

For a dual-business operator, the setup is simple. Create one project for each business. In the project instructions, paste in everything ChatGPT needs to know about that business: the name, the ABN if relevant, the audience, the tone, common terminology, what you do and don’t want it to include. When you open that project and start a chat, it’s working from that context.

Here’s what sticks inside a project:

The project-level instructions you write
Files you upload to the project (price lists, service descriptions, email templates)
Chat history within that project (when Memory is on)

What doesn’t carry across: your global custom instructions and memories from outside the project. Inside a project, those are switched off, the project instructions take over. That’s intentional. It’s what makes the separation clean.

Projects are available on ChatGPT Plus, Pro, and Teams plans. Free accounts don’t get access to Projects, that matters for the solo operator who hasn’t upgraded yet.

Custom instructions strategy when you’re not using Projects

If you’re on a free account, or you just don’t want to restructure into Projects, you can still make custom instructions work harder with a few tweaks.

The standard approach is to write instructions that cover both businesses explicitly. Something like: “I run two businesses. Business A is a bookkeeping practice serving small trades businesses in Victoria. Business B is an online course on invoicing for freelancers. At the start of any task, I’ll tell you which business I’m working on.”

Then start each conversation with a quick context line: “Working on Business B today.” That’s it. It takes two seconds, and it shifts the whole conversation.

The character limit for custom instructions is 1,500 characters on Free and Go plans, and 5,000 characters on Plus, Pro, and higher tiers. Five thousand characters is enough to write a proper brief on two separate businesses if you’re reasonably concise.

The downside: you’re doing the context-switching manually, every time. There’s nothing automatic about it. If you forget to specify, ChatGPT defaults to whatever blend it thinks is relevant, which is usually generic.

When separate accounts actually makes sense

Some operators keep two separate ChatGPT accounts, one per business. It’s a valid approach, though it comes with trade-offs.

On the plus side: complete separation. Different memories, different custom instructions, different chat histories. No risk of Business B context leaking into a Business A conversation. If you have a team member who only works on one business, you can give them access to just that account.

The cost: you’re paying twice if both accounts are on paid plans. As of 2026, ChatGPT Plus runs USD $20/month per account. If you need Projects (and you probably do for anything beyond simple drafting tasks), that’s $40/month for full separation.

Whether that’s worth it depends on how different your businesses are. If they’re in completely separate industries with different clients, different terminology, and you switch between them constantly, two accounts might save you enough friction to justify the cost. If they’re similar in nature (say, two service businesses in adjacent fields), a single Plus account with two Projects is almost certainly enough.

A quick setup routine for AU sole traders

Here’s a straightforward way to set this up in under 30 minutes if you’re on ChatGPT Plus.

Step 1, Create your first Project. In the left sidebar, click “New project.” Name it after your first business. Don’t use a generic name like “Project 1”, use the actual business name so you always know where you are.

Step 2, Write project instructions. Click the project, find the instructions field (usually under a gear or settings icon), and paste in a brief. Include: what the business does, who the clients are, what tone to use (formal/casual/somewhere in between), any words or phrases to avoid, and anything ChatGPT keeps getting wrong. Keep it factual and specific, don’t pad it.

Step 3, Upload one or two key reference files. If you have a service list, a rates sheet, or a standard email template, upload it. ChatGPT will be able to reference it in any chat inside that project.

Step 4, Repeat for Business 2. Same process, fresh project. It takes five minutes once you’ve done the first one.

Step 5, Update your global custom instructions. Go to Settings → Personalization → Custom Instructions. Trim out business-specific content and leave only things that apply to you personally across all contexts: your name, your location, your preferred response style, any formatting preferences.

Step 6, Start every work session by opening the right Project. That’s the whole habit. Click the project, start a chat. The context is already there.

If you’re on a free plan: skip steps 1–4 and go straight to step 5. Write your custom instructions to acknowledge both businesses. Then discipline yourself to open every chat with a one-line context statement.

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