Just Bought a Business? The First 100 Days of Systemising It
Most guides on buying a business stop at settlement: find the business, value it, do due diligence, sign the contract. That is the part your broker, accountant and lawyer help with. This guide covers what comes next, plus the few weeks just before completion: the first 100 days, when you go from owning the business on paper to actually running it.
Those 100 days decide a lot. You have the previous owner’s attention for a limited handover period, staff are watching to see what kind of owner you are, and the business still runs the way it did when someone else was in charge. The plan below is built around one idea: buy, systemise, grow. Understand the business first, take the easy wins second, and then build the systems that let it run without depending on any one person, including you.
Key takeaways
- Use the vendor’s handover period to capture what they know. Once they leave, that knowledge goes with them.
- Spend the first 30 days understanding how work actually moves before you change anything.
- Secure every account, login, domain and phone number early. These are often still in the previous owner’s name.
- Look for quick wins in revenue leakage, quote follow-up, duplicated admin and unused software before you look at headcount.
- By day 100, aim for documented processes, connected systems and a simple dashboard, so the business no longer runs on memory.
Before completion: what to line up in advance
The business.gov.au guide to buying an existing business covers readiness, valuation, due diligence and the contract. Your advisers will lead that work. Alongside it, a few operational things are much easier to sort out before settlement than after:
- Agree the handover in writing. Most sale contracts include a training or handover period where the vendor stays on. Make sure the length, the hours and what it covers are clear. “Available by phone” is not a plan.
- Ask for an accounts and systems list. Every software subscription, domain, email account, phone number, supplier portal and bank feed, and whose name each one is in.
- Find out who knows what. Ask the vendor which tasks only they do, and which staff the business would struggle without. This is your first look at key person risk.
- Plan day one. How you will introduce yourself to staff, key customers and suppliers. Check with your lawyer about employee transfer obligations and any notices you need to give.
If you are still in due diligence, our operational due diligence checklist lists the documents worth asking for before you sign.
The first 100 days after buying a business at a glance
| Phase | Focus | What you should have by the end |
|---|---|---|
| Days 0 to 30 | Understand before you change | A map of how work moves, a list of what depends on the previous owner, captured vendor knowledge, every account and login secured |
| Days 31 to 60 | Quick wins | Revenue leaks plugged, quote follow-up running, duplicated admin removed, unused software cancelled |
| Days 61 to 100 | Systemise | Core SOPs written and in use, key systems connected, a weekly dashboard, a plan for key person risk |
Days 0 to 30: understand before you change
The temptation as a new owner is to start fixing things straight away. You can see the inefficiencies, you have plans, and you want the investment to start paying back. Resist it for a month. Changes made before you understand why things are done a certain way tend to break something nobody told you about.
Map how work actually moves
Follow a job from the first enquiry to the final payment. Who answers the phone or the web form? How does a quote get written, sent and chased? How is work scheduled, delivered and invoiced? Where does information get typed in twice? Write it down as a simple list of steps, with who does each one and which system it lives in. The documented process and the real one are often different, so ask the people doing the work, not just the vendor.
List everything that depends on the previous owner
In owner-led businesses, a surprising amount routes through one person: pricing decisions, supplier relationships, approvals, the customers who only ever dealt with the owner, the report only they knew how to build. Keep a running list for the whole handover period. Every time someone says “we’d normally ask the old owner”, add it.
Capture the vendor’s knowledge while you still have them
The handover period is the most valuable and most wasted part of the deal. Do not spend it on general chat. Use it to record:
- Screen-recorded walkthroughs of the tasks only the vendor does, talking through each step.
- How they price jobs, and the exceptions they make.
- The story behind each key customer and supplier: history, quirks, what keeps them happy.
- The seasonal things that only happen once a year and are easy to forget.
Recordings are fine as a starting point. AI tools can turn a recorded walkthrough into a draft procedure in minutes, which you then check and tidy with the staff who will use it.
Secure accounts, logins and domains
This is the job that causes the most pain when it is left late. Check the domain registrar, website hosting, email, phone numbers, Google and social accounts, accounting software, CRM, payment gateways, supplier portals and any industry-specific systems. Move anything still in the vendor’s personal name into the business, change passwords, and make sure at least two people can get in. Keep it all in a simple register so you never have to rebuild it.
Days 31 to 60: quick wins
By now you know how the business runs. Quick wins build momentum with staff and free up time and cash for the bigger work. Look in four places.
Revenue leakage
Money that is earned but never collected. Work done but not invoiced, variations not charged, overdue invoices nobody chases, price increases that were never applied to old customers. Pull the debtor list and a sample of recent jobs and check them against invoices.
Quote follow-up
Many small businesses send a quote and wait. If nobody follows up, quotes go cold that would have converted with one call or email. A simple follow-up sequence, set up in the CRM or email system you already have, is often the fastest win available.
Duplicated admin
Look for the same information typed into two or three places: job details into the scheduling tool, then the invoicing tool, then a spreadsheet. Each double entry is time lost and a chance for errors. Connecting the systems or cutting a step usually fixes it.
Unused software
Go through the subscriptions list you built in the first month. Cancel tools nobody uses, merge duplicates, and downgrade plans that are paying for features nobody touches.
Why cutting people first is usually wrong
Some new owners look at the wage bill first and assume the quickest return is fewer staff. In a small business that is usually a mistake, for three reasons:
- Staff hold the knowledge. With the vendor gone, your team is the main record of how the business works. Lose the wrong person and you lose processes, customer relationships and context nobody wrote down.
- Trust is fragile early on. Staff are already uncertain after a sale. Early cuts can push your best people to leave on their own.
- The real waste is usually in the process. People often look busy because the systems make them re-key, chase and fix things. Fix the process and the same team can handle more work.
If roles do need to change, you will make a better call at day 100, once the processes are documented and you can see where the time actually goes.
Days 61 to 100: systemise
This is where the business stops running on memory. The aim is that the operation works whether or not any one person is in the room, including you.
Write the core SOPs
Start with the five to ten processes that would hurt most if they broke: quoting, job scheduling, delivery, invoicing, payroll, and anything the vendor used to do. Use the walkthroughs you recorded in the first month as the raw material. Our SOP template for small business gives you a format staff will actually use. Then check: are people following them? An SOP nobody uses is just a document.
Connect your systems
Link the tools that hold the same information so data flows once: enquiries into the CRM, accepted quotes into scheduling, completed jobs into invoicing. Fix the process first, then automate it. Automating a messy process just makes the mess faster.
Build a reporting dashboard
You should be able to see sales, pipeline, jobs in progress, cash and overdue invoices without asking anyone or opening five systems. A simple weekly dashboard is enough. It also means your decisions after day 100 are based on numbers, not the first impressions you formed in week one.
Deal with key person risk
Go back to the list of people the business would struggle without. For each one, make sure their knowledge is documented, someone else is cross-trained, and key customer relationships are shared across more than one person. Our guide to key person risk covers how to spot and reduce it.
Why a spreadsheet-run business can be an opportunity
Many buyers find the business runs on spreadsheets, paper job sheets and the owner’s memory. That can feel like a problem. It is often the opposite. The profit you bought was earned despite those systems, so there is usually room to improve without needing more customers. A business that already has modern systems has less left to gain from them.
The trap is ripping everything out at once. Replace one process at a time, starting with the one causing the most rework, and keep the old method running until staff trust the new one.
FAQ
What should I do first after buying a business?
Secure the accounts, logins, domains and phone numbers, introduce yourself to staff and key customers, and use the vendor’s handover period to capture what they know. Then spend the first month understanding how work moves before you change anything.
How long should the handover period be?
It depends on the business and is agreed in the sale contract. Whatever the length, plan it in detail. Use the time to record the vendor’s tasks, pricing logic and key relationships, not just to shadow them.
Should I change things straight away after a business acquisition?
Mostly no. Fix anything urgent, such as accounts at risk or cash leaking out, but hold off on bigger changes for around 30 days. Changes made before you understand the business often break things nobody told you about.
Do I need new software after buying a business?
Not straight away. Start by getting the most out of what the business already pays for, cancel what is unused, and connect the tools that hold the same data. Replace systems only once you know which process is causing the most rework.
Conclusion
Buying a business is the start of the work, not the end of it. The first 100 days are your best chance to capture the previous owner’s knowledge, secure what you own, take the quick wins and build systems that make the business run without depending on any one person. Done in that order, you end up with a business that is easier to run, easier to grow and, one day, easier to sell.
If you have just bought a business, or are about to complete, see how we systemise a newly bought business. We map, document and systemise it in your first 100 days. You can also read how it works, from the first diagnosis to the systems that keep running after we leave.
