Nobody outgrows a spreadsheet gradually. One specific thing breaks, and it is usually the same one.
The four signals
1. More than one person edits it regularly. This is the most common line. Concurrent editing produces overwrites, conflicting versions and a quiet loss of trust in what it says.
2. Follow up depends on memory. A spreadsheet stores current state well and has no concept of what should happen next. The second and third touches become acts of conscientiousness rather than process.
3. The same person or company appears twice. Duplicates are the cost of concurrent editing, and they get expensive when two people contact the same lead about different things.
4. You need history, not current state. The moment someone asks what changed since last month, a sheet that holds only the present cannot answer.
What breaks first, in order
Follow up reminders. Then duplicate contacts. Then reporting, which is when leadership notices, long after the team already knew.
If you are trying to time the move, watch the first one. By the time reporting breaks you have been losing deals for a while.
What spreadsheets are still better at
Worth saying, because the move is often oversold.
Ad hoc analysis. Quick lists. Anything nobody will maintain past this week. A spreadsheet is the fastest tool in existence for answering a one off question, and it remains the right choice for that after you have a CRM.
What it cannot do is hold process.
Move to the smallest thing that fixes the break
The common mistake is buying the largest platform available, configuring a fraction of it, and going back to the sheet within a quarter. Now you pay for both.
If follow up is what broke, you need something that holds a next action with a date and reminds someone. That is a small requirement and a lot of tools meet it.
Buy for the break you have. You can grow into more later, and you probably will.
What to bring across and what to leave
Bring: the records, the source of each one, and the next action.
Leave: every column somebody added once and nobody has used since. A migration is the cheapest moment you will ever have to delete things, and carrying the mess across means you paid to move and kept the problem.
After the move
Two rules keep it from failing.
One source of truth, stated out loud. The spreadsheet can stay for analysis and stops being a record.
And the pipeline review runs on the new system. If the manager's meeting still uses a sheet, the sheet is still the real system and the tool will be abandoned within the quarter.